SPF Insulation

Detail ID
4.0401.1
Topic
Conditioned Subspaces
SubTopic
Rim/Band Joist
Desired Outcome

Continuous, contiguous, and safe thermal boundary that prevents air movement @ 50 Pascals

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MF
Specification Objective

Verify that installation area is free of:

active water leaks, fuel leaks (i.e., gas, oil, propane), and pest intrusions

energized knob and tube wiring

uncovered electrical junctions

improperly terminated devices (ventilation fans, dryers, plumbing stacks, condensate lines, combustion appliance flues/chimneys, etc.)

unshielded high-temperature devices (non-IC rated recessed lights, chimneys, flues, vents, etc.) unless they are zero clearance devices

insulation escape openings

Verify that installation area is:

intact and able to support insulation weight

Ensure insulation can be safely installed

  • SF
  • MF
Specification Objective

Select SPF that is between 0.5 and 2.0 lb/ft3 in density and has a flame spread/smoke development index of 25/450 or less when tested in accordance with ASTM E84 or UL 723

Meet fire safety requirements

  • SF
  • MF
Specification Objective

Remove existing insulation and vapor retarders from installation area

Install durable backing material over any escape holes in the air barrier

Ensure utility junctions remain accessible per local code requirements

Prevent condensation, prevent SPF escape

  • SF
  • MF
Specification Objective

Remove contaminants from all SPF application surfaces that will prevent full adhesion or cause degradation

Verify all SPF application surfaces are in accordance with manufacturer specifications for moisture content and temperature

Properly bonded SPF installation

  • SF
  • MF
Specification Objective

Apply SPF to prescribed R-value in a continuous layer from subfloor surface, over band/rim joist and sill/wall plate, and in contact with foundation or ceiling below using a pass thickness maximum as indicated by manufacturer specifications

Install to a thickness of least a class II vapor retarder or have at least a class II vapor retarder coating or covering in direct contact with the interior (or warm) side of the SPF

Continuous pressure and thermal boundary that prevents moisture vapor movement

  • SF
  • MF
Specification Objective

If foam is no more than 3 1/4" thick and the space is not permanently habitable no thermal barrier is required

If foam is thicker than 3 1/4", doesn't meet the flame and smoke index, or is of less than 0.5 lb/ft3 density, separate foam from the subspace with a suitable thermal barrier covering or coating as indicated in manufacturer's specifications and applicable building code

If code requirements are unclear, consult local code officials for clarification

Minimize ignition and combustion potential

  • SF
  • MF
Specification Objective

Post a dated receipt signed by the installer that minimally includes: Installed insulation type, coverage area, installed thickness, and installed R-value

Comply with 16 CFR 460.17 and document contract compliance

View Sub-Topic:
Rim/Band Joist