Certainteed 90015277 Fsk Duct Wrap R-4.2 1.5x48x100 Ft

Product Description

The CERTAINTEED 90015277 is a fiberglass blanket-type duct wrap insulation with an FSK (foil-scrim-kraft) facing, designed for insulating the exterior surfaces of HVAC ductwork. At 1.5 inches thick and 0.75 pcf density, it delivers an installed R-value of 4.2 and an out-of-package R-value of 5.2, providing reliable thermal performance and condensation control. The FSK facing acts as a vapor retarder and radiant barrier on the duct exterior. The low-dust, easy-cutting fiberglass binder improves jobsite handling, making installation faster for mechanical contractors and sheet metal workers.

This duct wrap is intended for HVAC system exterior applications in both residential and light commercial construction. It is the preferred choice when system design parameters rule out duct liner or rigid duct board, such as on exposed rectangular or round sheet metal ductwork in unconditioned spaces like attics, crawlspaces, and mechanical rooms. One roll covers 400 square feet, making it well-suited for larger trunk line runs. It is rated for continuous service up to 250 degrees F, meeting requirements for most forced-air heating and cooling applications.

Key Features

• Installed R-value of 4.2 with 1.5-inch thickness at 0.75 pcf density
• FSK facing provides vapor retarder and radiant barrier on duct exterior
• Low-dust fiberglass binder improves cutting and handling on the jobsite
• Temperature rating of 250 degrees F suits forced-air heating and cooling systems
• Single roll covers 400 square feet, reducing material handling on large duct runs
• Formaldehyde-free manufacturing for improved indoor air quality compliance

Compatibility

Designed as an OEM-style replacement wrap for HVAC duct exterior applications where duct liner or rigid board insulation is not permitted by design parameters, including rectangular and round sheet metal ductwork in residential and light commercial forced-air systems.

Installation Notes

Installation is typically performed by licensed mechanical contractors or sheet metal workers in accordance with SMACNA guidelines and local mechanical codes. The HVAC system should be shut down and de-energized before wrapping ductwork. The FSK facing should be installed facing outward, and all seams and edges must be sealed with foil tape rated for duct insulation to maintain vapor retarder continuity. Do not compress the insulation beyond the installed thickness, as compression reduces the effective R-value.

Technical Specifications

• Model: Type 75
• Thickness: 1.5 inches
• Width: 48 inches
• Length: 100 feet
• Coverage Area: 400 square feet
• R-Value (Out-of-Package): 5.2
• R-Value (Installed): 4.2
• Density: 0.75 pcf
• Temperature Rating: 250 degrees F
• Material: Fiberglass
• Facing Color: Silver

Standard Information

• Brand: CERTAINTEED
• Manufacturer Part Number: 90015277