4.1005.8 Loose Fill Over Existing Insulation on Accessible Attic Floors

Topic: 
Attics
Subtopic: 
Attic Floors
Desired Outcome: 
Insulation controls heat transfer through ceiling
For supporting material, see Referenced Standards.
TitleSpecification(s)Objective(s)
4.1005.8a
Preparation

New insulation will not be added until all air sealing has been completed

Existing insulation will be inspected to confirm that it is not concealing 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 weaknesses and is in full contact and alignment with the 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

Where the insulation is disturbed or found not to be in contact with the 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 , it will be reinstalled to be in contact with the 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 ; if it cannot be reinstalled or if its condition compromises its effectiveness, the insulation will be removed

Insulation will be adequately marked for depth a minimum of every 300 square feet of attic area with measurement beginning at the 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

All electrical junctions will be flagged to be seen above the level of the insulation

Open electrical junction boxes will have covers installed

Insulation dams and enclosures will be installed as required

Blocking will be installed to maintain existing vented attic functionality

Ensure proper performance of insulation

Verify uniformity of insulation material

Provide location of electrical junctions for future servicing

Prevent an electrical hazard

4.1005.8b
Installation

The correct depth and number of bags will be blown in accordance with manufacturer specifications

Insulation will be installed to prescribed R-value

Final R-value will account for the compression of existing insulation

Insulate to prescribed R-value

4.1005.8c
Safety

Insulation will not be allowed on top of non-insulation contact ( IC IC Insulation contact )-rated can light Can light A light fixture (or can) that is recessed into the ceiling boxes or between a heat-generating appliance and a dam unless material is rated for contact with heat-generating sources

All insulation materials used will meet ASTM ASTM ASTM International, www.astm.org E84 flame spread/smoke development rating of 25/50

Prevent a fire hazard

4.1005.8d
Onsite documentation

A dated receipt signed by the installer will be provided that includes:

  • Insulation type
  • Coverage area
  • R-value
  • Installed thickness and minimum settled thickness
  • Number of bags installed in accordance with manufacturer specifications
  • Document job completion to contract specifications

    Confirm amount of insulation installed

    Ensure ability to match bags required for total area completed

    Comply with 16 CFR 460.17