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Hamshaw Lumber Inc

1/2" 4x8 POLYISO FOIL SHEET R3.3

SKU #12URF UPC #1248C
1/2" 4x8 POLYISO FOIL SHEET R3.3
Regular Price
$ 24.95 EA
Subject to availability and seasonality from suppliers. If we cannot get it, you will be notified and refunded.
Hamshaw Lumber Inc Keene, NH
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Description

/2" x 4' x 8' Polyiso Foil-Faced Foam Insulation Board (R-13)

Maximize your thermal protection without sacrificing space. This high-performance Polyisocyanurate (Polyiso) rigid foam board offers one of the highest R-values per inch available on the market. Featuring a reinforced foil facer on both sides, it acts as a powerful radiant barrier, reflecting heat and providing a continuous insulation layer that eliminates thermal bridging.

Key Features

Superior Thermal Resistance: Delivers an impressive R-13 rating, providing maximum energy efficiency in a slim 1/2" profile.

Radiant Barrier Technology: Dual-sided foil facing reflects up to 97% of radiant heat, keeping interiors cooler in summer and warmer in winter.

Moisture & Air Management: The closed-cell structure is naturally water-resistant and, when joints are taped, creates an effective air and vapor barrier.

Versatile Application: Ideal for use in residential and commercial projects, including walls, ceilings, crawl spaces, and specialized DIY projects like van conversions or shed insulation.

Easy Installation: Lightweight sheets are easy to score, cut, and snap, allowing for fast installation around outlets and architectural details.

Technical Specifications

AttributeSpecification
Dimensions1/2" Thick x 4' Wide x 8' Long
R-ValueR-13
MaterialClosed-cell Polyisocyanurate
FacingReinforced Aluminum Foil (Both Sides)
Fire RatingClass A (Varies by brand; check local codes)
Coverage32 sq. ft. per sheet

Common Uses

Interior Walls: Adding high R-value to slim wall cavities.

Basements & Crawlspaces: Providing a moisture-resistant thermal break.

Attics: Installing against rafters to reduce radiant heat transfer.

Specialty Projects: Insulating garage doors, RVs, or climate-controlled storage.

Pro-Tip: For the best performance, seal all seams with high-quality foil tape to ensure a continuous air barrier and prevent thermal leaks.