4.1102.2 Open-Cavity Wall—Spray Polyurethane Foam (SPF) Installation

Topic: 
Walls
Subtopic: 
Accessible Walls
Desired Outcome: 
Exterior walls are insulated and sealed
For supporting material, see General Information on Spray Polyurethane Foam (SPF), Referenced Standards and Building America Solution Center.
TitleSpecification(s)Objective(s)
4.1102.2a
Installation

Interior cladding or interior finish material will be removed on areas to be insulated

SPF SPF Spray polyurethane foam will be applied to desired thickness, using pass thickness maximum as indicated by manufacturer

SPF SPF Spray polyurethane foam will be applied onto exterior sheathing or interior finish materials between studs and top/bottom plates

Insulate and seal exterior walls
4.1102.2b
Vapor retarders

If vapor retarder Vapor retarder A material that slows the passage of water vapor and contains a perm rating above 1 is needed, it will be applied in proper location

In colder climates ( IECC IECC International Energy Conservation Code Zones 5-8), the SPF SPF Spray polyurethane foam used will be installed to a thickness of at least Class II vapor retarder Vapor retarder A material that slows the passage of water vapor and contains a perm rating above 1 or have at least Class II vapor retarder Vapor retarder A material that slows the passage of water vapor and contains a perm rating above 1 coating or covering in direct contact with the inside surface of the SPF SPF Spray polyurethane foam

Minimize water vapor condensation in walls
4.1102.2c
Fire protection

SPF SPF Spray polyurethane foam will be separated from the occupied interior spaces of the building with a thermal barrier (typically ½" or thicker gypsum wallboard or approved alternate assembly)

Check local codes for fire protection requirements

Provide necessary fire protection for combustible SPF SPF Spray polyurethane foam insulation
4.1102.2d
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