4.1104.4 Spray Foam Insulation Installation in Cavities above Doors and Windows

Topic: 
Walls
Subtopic: 
Manufactured Housing Wall Insulation
Desired Outcome: 
Consistent, uniform thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow and air barrier Air barrier The separation between the interior and exterior environments of a building that slows air flow to the point that no smoke movement is visible at 50 pascals of pressure difference across the boundary between the conditioned space and unconditioned space
TitleSpecification(s)Objective(s)
4.1104.4a
Access wall cavities above doors and windows

All interior surfaces of the cavities planned to be insulated will be inspected for loose paneling joints, occupant wall hangings, and other wall obstructions

Objects will be removed from the interior surfaces of the exterior walls as needed

Interior paneling will be repaired and secured as necessary

Holes will be drilled from the interior of the house

A hole no larger than the spray nozzle will be drilled in each cavity above the door or window

When possible, the hole will be drilled in the panel groove

Prepare wall cavity for insulation

Prevent damage from overspray to occupant possessions

4.1104.4b
Cavity inspection

Cavity will be probed to assess conditions and volume of cavity

Determine the approximate amount of foam to be installed in the cavity

4.1104.4c
Insulation installation

Flame spread index of foam insulation will not exceed 75 and a smoke- developed index of no more than 450 when tested in the maximum thickness intended for use in accordance with ASTM ASTM ASTM International, www.astm.org E84 or UL UL Underwriters Laboratories 723

Foam insulation will be separated from the interior of the building by an approved thermal barrier at a minimum of 1/2" gypsum wallboard or a material that is tested in accordance with the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA NFPA National Fire Protection Association, www.nfpa.org 275

Two-part foam selection will be based on regional considerations

100% of each cavity will be filled to a consistent density without bulging of panels or siding

Fill entire wall cavity to the prescribed R-value to reduce air infiltration Infiltration The uncontrolled passage of outside air into a building through unintended leaks in the building envelope

Fire safety will be maintained

4.1104.4d
Final wall assembly

A color-corresponding sealant will be applied to the access hole

Ensure wall is aesthetically pleasing

4.1104.4e
Onsite documentation
A dated receipt signed by the installer will be provided that includes:
  • Coverage area
  • Thickness
  • R-value

Document job completion to contract specifications

Confirm amount of insulation installed

Comply with 16 CFR 460.17