MH - Blown Insulation for Flat, Bowed, or Vaulted Ceilings (via Roof Side Lift)

Detail ID 4.0103.10
Attic Floors - Unconditioned Attics
Desired Outcome

Continuous, contiguous, safe, and compliant thermal barrier installation that protects integrity of roof

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

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, able to support insulation weight, and air sealed

Ensure space can be safely insulated

  • MH
Specification Objective

Select loose fill fiberglass 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 insulation

  • MH
Specification Objective

Remove a small section (no more than 10') of fasteners at a time from the J channel and the roof edge on the most easily accessible side of the dwelling and separate roof from the heel plate and siding

Prop roof open no more than necessary to accommodate fill tube access to entire cavity

Avoid performing this method when high winds are expected

Create safe access to entire cavity

  • MH
Specification Objective

Fill entire attic to prescribed R-value

If existing insulation is roof-mounted, insulation will be blown below

If existing insulation is ceiling-mounted, insulation will be blown above

If existing insulation is mounted at both locations, insulation will be blown in between

Continuous thermal barrier of consistent R-value

  • MH
Specification Objective

Remove existing sealant from the roof edge and J channel

Install new sealant at the original location

Install new J channel if existing J channel is damaged

Fasten roof and J channel to the original location with new screws

Seal all seams, edges, and penetrations of roof/wall connection

Weathertight roof 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