Specification

THIS IS NOT A CONSTRUCTION DOCUMENT. Edit carefully to coordinate with specific project requirements.

User must determine suitability of this guide specification in whole or in part for their particular project.

Owens Corning

Fiberglass Batt Insulation

Guide Specification 07 21 16 - 4

have been tested and inspected.

B. Provide written report listing conditions detrimental to performance of work in this section. Do not proceed

with installation until unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Comply with manufacturer's installation instructions and ASTM C1320. Do not use unfaced insulation in exposed

applications where there is potential for skin contact and irritation. Kraft and standard foil facings will burn and

must not be left exposed. The facing must be installed in substantial contact with the unexposed surface of the

ceiling, wall or floor finish. Protect facing from any open flame or heat source.

B. Friction-fit blanket insulation in place, until the interior finish is applied. Install batts to fill entire stud cavity, with

no gaps, voids, or areas of compression. If stud cavity is less than 8 feet in height, cut lengths to friction fit against

floor and ceiling tracks. Walls with penetrations require that insulation be carefully cut to fit around outlets, junction

boxes, and other irregularities.

1. Do not install insulation on top of or within 3 inches of recessed light fixtures unless the fixtures are approved

for such use.

C. In crawl spaces and where the underside of floors are exposed to unconditioned space, insulation shall fill the cavity

or be installed in contact with the underside of the decking. If vapor retarder is required by local code, a Kraft vapor

retarder must be in contact with a 15-minute thermal barrier, typically on the bottom side of the insulation.

D. Within exterior wall framing, install insulation between pipes and backside of sheathing. Cut or split insulation

material as required to fit around wiring and plumbing.

E. Where showers and bathtubs are located on exterior walls, typically install insulation and vapor retarder between

units and exterior.

F. If eave ventilation baffles are required, install ventilation baffles at eaves to hold insulation down from roof

sheathing and provide positive ventilation from eave to attic space.

G. Fluff insulation to full thickness for specified R-value before installation. Do not compress insulation in the cavity

during installation, creating gaps or voids that could diminish thermal value.

H. Trim insulation neatly to fit spaces. Fill miscellaneous gaps and voids with insulation.

I. Fit insulation tight in spaces and tight to exterior side of mechanical and electrical services within the plane of

insulation.

J. For unfaced batt insulation, install with friction fit or retain in place with manufacturer’s recommended fasteners or

mesh.

K. For batt insulation with factory-applied facing, install with vapor retarder membrane facing warm in the winter side

of building spaces or as specified by local building code. Lap ends and side flanges of membrane over or between

framing members. Tape to seal tears, cuts or misalignments in membrane.

L. Secure insulation in place using one of the following methods: Friction fit; staple or nail facing flanges in place as

needed, tape in place, retain in place with spindle fasteners, retain in place with wire mesh secured to framing

members.

3.3 PROTECTION

A. Protect installed insulation from damage due to weather and physical abuse until protected by permanent

construction.

End of Section 07 21 16

Pub. No. 10024955. June 2021.