4.1301.6 Pier Construction Subfloor Insulation—Batt Installation with Rigid Barrier

Topic: 
Floors
Subtopic: 
Accessible Floors
Desired Outcome: 
Consistent, uniform thermal barrier between conditioned and unconditioned space to prescribed R-value of an adjoining insulated assembly
TitleSpecification(s)Objective(s)
4.1301.6a
Subfloor preparation

Sealing between house and crawl space will be completed before insulating

Ensure airtight envelope Envelope The separation between the interior and exterior environments of a building that includes a combination of air and thermal barrier

Prevent leakage

4.1301.6b
Installation

Insulation will be installed in contact with subfloor without gaps, voids, compressions, misalignments, or wind intrusions

If kraft-faced batts are used, they will be installed with kraft facing to subfloor

Insulation will be installed to prescribed R-value

Insulate to prescribed R-value

4.1301.6c
Secure batts

Batts will be secured with physical fasteners

Ensure insulation remains in contact with subfloor

4.1301.6d
Rigid 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

A rigid 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 will be mechanically fastened to underside of floor assembly

Seams and penetrations will be sealed

Protect insulation

4.1301.6e
Occupant education

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