4.1003.14 Accessible Unvented Flat Roof with or without Existing Insulation

Topic: 
Attics
Subtopic: 
Attic Ceilings
Desired Outcome: 
Insulation reduces heat flow through unvented roof
For supporting material, see Referenced Standards and Building America Solution Center.
TitleSpecification(s)Objective(s)
4.1003.14a
Worker safety

All worker safety specifications will be in accordance with SWS 2.0100.3 Worker Safety

Ensure worker safety, especially in regard to fall protection considerations and contaminants found in demolition, such as asbestos, lead, polychlorinated biphenyls, etc.

4.1003.14b
Occupant safety

An occupant safety plan will be prepared and implemented

Ensure occupant safety

4.1003.14c
Pre-inspection

Conduct pre-inspection in accordance with SWS 2.0100.4 Work Area Inspection and Stabilization

Insulation will not be installed if moisture-related issues are not resolved

Ensure a durable, continuous air and thermal boundary Thermal boundary The separation between the interior and exterior environments of a building that slows heat flow

4.1003.14d
Preparation

New insulation that is not designed to also serve as an 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 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 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

Covers will be installed on open electrical junction boxes

Insulation dams and enclosures (e.g., can lights, sprinkler systems, access hatch, chimney) will be installed as required

Where loose fill or batt insulation is used, it will have a maximum 25 flame spread/50 smoke-developed index when tested to ASTM ASTM ASTM International, www.astm.org E84 or UL UL Underwriters Laboratories 723

Where rigid foam plastics are used, in no case will the final thickness exceed the manufacturer's tested thickness used to determine the maximum 75 flame spread and 450 smoke-developed index when tested to ASTM ASTM ASTM International, www.astm.org E84 or UL UL Underwriters Laboratories 723

Foam will be provided with ignition and thermal boundaries as required by code

Minimize potential for warm, moist air to enter the attic and condense on cold surfaces

Ensure proper performance of insulation

Verify uniformity of insulation material

Provide location of electrical junctions for future servicing

Prevent an electrical hazard

4.1003.14e
Installation

Attic insulation will be installed without gaps, voids, compressions, misalignments, or wind intrusions

Roof cavities will be blown with loose-fill insulation without gaps, voids, compressions, misalignments, or wind intrusions

Insulation will be installed to prescribed R-value

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

Insulate to prescribed R-value

4.1003.14f
Ventilation

Code compliant ventilation will be installed before insulation

Reduce possibility of moisture issues

4.1003.14g
Occupant education

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