MH - Blown Fiberglass Through Penetrations

Detail ID 4.0202.5
Enclosed Walls
Desired Outcome

Continuous, contiguous, and safe thermal boundary

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


  • MH
Specification Objective

Verify that installation area is free of:

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

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

Verify that installation area is:

intact, able to support insulation weight and pressure, and air sealed

Prepare for safe, effective, and airtight installation of dense-packed insulation

  • MH
Specification Objective

Select insulation that has a flame spread and smoke development index of 25/450 or less when tested in accordance with ASTM E84 or UL 723

Select fire safe materials

  • MH
Specification Objective

Select sealants that:

are compatible with their intended surfaces

allow for differential expansion and contraction between dissimilar materials

meet the requirements of the applicable fire safety code (e.g., thermal or ignition barriers)

are low volatile organic compound (VOC) sealants for use inside the pressure boundary that meet independent testing and verification protocols

Select safe and effective sealants

  • MH
Specification Objective

Remove objects from the interior surfaces of the walls being insulated

Install durable blocking materials at any openings to the cavity

Repair or reattach interior paneling as necessary

Set up dust containment enclosure in installation area for all interior installations

Protect property and workers

Contain insulation inside cavity where intended

  • MH
Specification Objective

Exterior access:

Remove the exterior cladding at the insulation access point when feasible

If not feasible, drill holes in the exterior siding around the perimeter of the home, parallel to the bottom plate, an equal distance apart, and located under the lowest window sill when possible

Neatly cut any vapor retarder installed and minimize air barrier and drainage plane disruption

Create an access hole through the sheathing sufficient to access the cavity with fill tube

Access all wall cavities safely and prepare for access closure

  • MH
Specification Objective

Install insulation in entirety of each cavity to a density of no more than 1.6 pounds per cubic foot between the interior paneling and any existing insulation

Do not overfill any portion of the cavity

Airtight and continuous pressure and thermal boundary

  • MH
Specification Objective

Exterior access holes will be closed as follows:

Plug holes in sheathing with durable materials and seal with weatherproof exterior sealant

Close weather barrier and seal seams with compatible sealant tape

Reinstall exterior cladding and secured with mechanical fasteners

Airtight, durable hole closure

  • MH
Specification Objective

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

Comply with 16 CFR 460.17 and document contract compliance