Fortress Rough Opening Accessory (ROA) Installation Kits

The Fortress Rough Opening Accessories (ROA) Installation Kits are available in various kits and sizes for jamb-less windows, windows with jamb extensions, in-swing doors, out-swing doors, patio doors, and packaged terminal air conditioners (PTAC) Units.
1-5/8″ Standard Window Kits, and Out-Swing Door Kits
3 Foot Kit (900 mm)
Kit No. SW-ODK-3
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1-5/8″ Standard Window Kits, and Out-Swing Door Kits
6 Foot Kit (1,800 mm)
Kit No. SW-ODK-6
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3-1/4″” Jamb Extension Window, and 2″x4″ Wall Patio Door Kits
3 Foot Kit (900 mm)
Kit No. JW-4PDK-3
(Click image to learn more…)
3-1/4″” Jamb Extension Window, and 2″x4″ Wall Patio Door Kits
6 Foot Kit (1,800 mm)
Kit No. JW-4PDK-6
(Click image to learn more…)
5-3/8″ In-Swing Door Kits, and 2″x6″ Wall Patio Door Kits
3 Foot Kit (900 mm)
Kit No. ID-6PDK-3
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5-3/8″ In-Swing Door Kits, and 2″x6″ Wall Patio Door Kits
6 Foot Kit (1,800 mm)
Kit No. ID-6PDK6
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5-5/8″ Packaged Terminal Air Conditioner (PTAC) Kits
3 Foot Kit (900 mm)
Kit No. PTAC-3
(Click image to learn more…)
5-5/8″ Packaged Terminal Air Conditioner (PTAC) Kits
6 Foot Kit (1,800 mm)
Kit No. PTAC-6
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Fortress Rough Opening Accessories (ROA) Kit for
Standard Window and Out-Swing Door Kit, 1-5/8” (42 mm)
Size: Three (3) foot kit (915 mm) Part No. SW-ODK-3
This ROA kit is intended for rough openings up to 3 feet (915 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 1-5/8” (42 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 1-5/8” (42 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Two (2) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm ) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Four (4) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Standard Window and Out-Swing Door Kit, 1-5/8” (42 mm)
Size: Six (6) foot kit (1,829 mm) Part No. SW-ODK-6
This ROA kit is intended for rough openings up to 6 feet (1,829 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 1-5/8” (42 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 1-5/8” (42 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Five (5) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm ) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Seven (7) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Standard Window and Out-Swing Door Kit, 1-5/8” (42 mm)
Size: Eight (8) foot kit (2,438 mm) Part No. SW-ODK-8
This ROA kit is intended for rough openings up to 8 feet (2,438 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 1-5/8” (42 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 1-5/8” (42 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Seven (7) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm ) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Nine (9) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Jamb Extension Window Kit and 2″x4″ Wall Patio Door Kit, 3-1/4” (83 mm)
Size: Three (3) foot kit (915 mm) Part No. JW-4PDK-3
This ROA kit is intended for rough openings up to 3 feet (915 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 3-1/4” (83 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 3-1/4” (83 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Two (2) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Four (4) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Jamb Extension Window Kit and 2″x4″ Wall Patio Door Kit, 3-1/4” (83 mm)
Size: Six (6) foot kit (1,829 mm) Part No. JW-4PDK-6
This ROA kit is intended for rough openings up to 6 feet (1,829 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 3-1/4” (83 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 3-1/4” (83 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Five (5) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm ) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Seven (7) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Jamb Extension Window Kit and 2″x4″ Wall Patio Door Kit, 3-1/4” (83 mm)
Size: Eight (8) foot kit (2,438 mm) Part No. JW-4PDK-8
This ROA kit is intended for rough openings up to 8 feet (2,438 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 3-1/4” (83 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 3-1/4” (83 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Seven (7) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm ) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Nine (9) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
In-Swing Door Kit, and 2″x6″ Wall Patio Door Kit, 5-5/8” (137 mm)
Size: Three (3) foot kit (915 mm) Part No. ID-6PDK-3
This ROA kit is intended for rough openings up to 3 feet (915 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 5-3/8” (137 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 5-3/8” (137 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Two (2) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Four (4) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
In-Swing Door Kit, and 2″x6″ Wall Patio Door Kit, 5-5/8” (137 mm)
Size: Six (6) foot kit (1,829 mm) Part No. ID-6PDK-6
This ROA kit is intended for rough openings up to 6 feet (1,829 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 5-3/8” (137 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 5-3/8” (137 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Five (5) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Seven (7) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
In-Swing Door Kit, and 2″x6″ Wall Patio Door Kit, 5-5/8” (137 mm)
Size: Eight (8) foot kit (2,438 mm) Part No. ID-6PDK-8
This ROA kit is intended for rough openings up to 8 feet (2,438 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 5-3/8” (137 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 5-3/8” (137 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Seven (7) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Nine (9) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Packaged Terminal Air Conditioner (PTAC) Kit, 5-5/8” (137 mm)
Size: Three (3) foot kit (915 mm) Part No. PTAC-3
This ROA kit is intended for rough openings up to 3 feet (915 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 5-3/8” (137 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 5-3/8” (137 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Two (2) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Four (4) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Packaged Terminal Air Conditioner (PTAC) Kit, 5-5/8” (137 mm)
Size: Six (6) foot kit (1,829 mm) Part No. PTAC-6
This ROA kit is intended for rough openings up to 6 feet (1,829 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 5-3/8” (137 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 5-3/8” (137 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Five (5) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Seven (7) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Packaged Terminal Air Conditioner (PTAC) Kit, 5-5/8” (137 mm)
Size: Eight (8) foot kit (2,438 mm) Part No. PTAC-8
This ROA kit is intended for rough openings up to 8 feet (2,438 mm) wide.
Molded flame retardant polypropylene sill corner protection with lapping flange extending 5-3/8” (137 mm) into the sill of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening. Lapping sides extending into the sill of the rough opening shall provide a 5-3/8” (137 mm) long outwards sloped surface directing moisture to the outer edge of rough opening. Inwards lap shall extend 8-1/2” (216 mm) up the jamb within the rough opening.
Sill corner protection components are universal fit for left and right sill corners. Once installed, the sill corner’s formed sill slope and tapered surface up the jamb shall form a hollow cavity behind it for application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance.
Ends of sill corner protection are recessed to receive over lapping sloped centre strip. Sill corner include specific slots on the back side for the installation of load bearing sloped shims.
Included Accessories:
- Seven (7) Sloped Sill Centre Strips. Molded flame retardant polypropylene sloped centre strip are sloped to match the slope of sill corner protection component and be installed over lapping the sill corner protection components. Once installed, the sloped sill centre strip forms a hollow cavity below it for the application of low expansion, low build, air sealing spray foam insulation behind the sill corner for increased insulation thermal resistance. Keeping the insulation out of moisture in the sill. Bottom side of the sill centre strip are reinforced at 5” (125 mm) on centre to support the transfer of window, door or other units load from the upper sloped load bearing shim.
- Matched Sloped Load Bearing Shims: Molded flame retardant polypropylene sloped load bearing shims. Shim sloped to match sill corner protection slopes. Lower shim are sized to fit into the back side of the sill corner protecting component. Upper sloped shims are complete with a hooked edge on back side to hook the upper sloped shim onto the sill corner protection and centre strip. Nine (9) upper shims and two (2) lower shims.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.

Fortress Rough Opening Accessories (ROA) Kit for
Air Barrier and exterior Vapour Barrier rough opening head corner flashing membrane tie-in,
Size: Universal Fit Part No. AVT-01
Molded flame retardant polypropylene head corner membrane tie in with lapping flange extending 5-3/8” (137 mm) into the jamb and head of the rough and a minimum of 2” out onto the adjacent wall face of the rough opening.
Included Accessories:
Two (2) universal Weather Resistive Barrier and Air barrier Head Tie-in corners.
Fabrication Materials (For all components):
Water Absorption: 24 hrs @ 23°C, 0.010%, ASTM D570
Ignition Resistance: Flame retardant.
Design Pressure (DP) Rating:
- For Class R, LC & CW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 15% shall meet a Design Pressure (DP) rating of 61.26 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.
- For Class AW fenestration for Resistance to Moisture Infiltration (RMI): 9.189 psf (440 Pa) at 20% shall meet a Design Pressure (DP) rating of 45.94 psf, by modified ASTM E331-00 (Reapproved 2009) Category 4 Hurricane resistance.