4.1401.1 Band/Rim Joists—Spray Polyurethane Foam (SPF) Installation

Topic: 
Basements and Crawl Spaces
Subtopic: 
Band/Rim Joists
Desired Outcome: 
Insulate and seal all band/rim joist areas between subfloor and foundation or top plate of wall below
For supporting material, see Calculation of the Infiltration Credit, General Information on Spray Polyurethane Foam (SPF) and Referenced Standards.
TitleSpecification(s)Objective(s)
4.1401.1a
Preparation

All band/rim joist areas will be open and accessible for SPF SPF Spray polyurethane foam application

All surfaces where SPF SPF Spray polyurethane foam is applied will be clean, dry, and free of contamination and degradation

Substrate surfaces will be wiped, blown, or vacuumed to be free of excessive dust and dirt

Grease and oil will be removed using appropriate cleaners or solvents

Moisture content of all wood substrate materials will be checked to ensure it is below 20%

Prepare all substrate surfaces for the application of SPF SPF Spray polyurethane foam

4.1401.1b
Installation

SPF SPF Spray polyurethane foam will be applied to desired thickness, using pass thickness maximum in accordance with manufacturer specifications, onto subfloor between floor joists and all rim/band joists

When applied to first floor, SPF SPF Spray polyurethane foam will be continuous from subfloor surface, over band/rim joist and sill plate, and in contact with foundation below, except as stipulated by classification 4.1402.1c

When applied to second story floor or above, SPF SPF Spray polyurethane foam will be continuous from subfloor surface, over band/rim joist, and in contact with top plate below 

Insulate and seal floors
4.1401.1c
Fire protection


If  SPF exceeds a thickness of 3", all SPF SPF Spray polyurethane foam will be separated from the occupied interior space of the building with an approved thermal barrier material (typically ½" or thicker gypsum wallboard or an approved thermal barrier coating)

Application to rim/band joist up to 3" can be left exposed if the foam is Class I, unless the space is a habitable space and then cover it with drywall or another thermal barrier

Local codes will be confirmed and followed for fire protection requirements 

Provide necessary fire protection for combustible SPF SPF Spray polyurethane foam insulation
4.1401.1d
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