Elevate Polyisocyanurate Roof Insulation Board, 1.0 to 4.0 in. Thicknesses, 4 ft. x 8 ft. or 4 ft. x 4 ft.

$33.46

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Elevate Polyisocyanurate Roof Insulation Board, 1.0 to 4.0 in. Thicknesses, 4 ft. x 8 ft. or 4 ft. x 4 ft.

Elevate polyiso roof insulation boards are rigid polyisocyanurate foam panels available in thicknesses from 1.0 to 4.0 inches and sheet sizes of 4 ft. x 8 ft. or 4 ft. x 4 ft. They insulate low-slope roof assemblies beneath the membrane or cover board. Each order is one sheet in the chosen thickness and size.

Key Features:

  • Wide thickness range: Offered in 1.0, 1.5, 2.0, 2.5, 2.6, 3.0 and 4.0 inch thicknesses.
  • Two sheet sizes: Available in 4 ft. x 8 ft. and 4 ft. x 4 ft. sheets depending on thickness.
  • Polyiso foam core: Rigid polyisocyanurate foam provides high thermal resistance per inch.
  • Low-slope roofing: Used as flat rigid insulation in roof assemblies.
  • Elevate system fit: Pairs with Elevate roofing membranes and Isogard HD cover board.
  • Per-sheet ordering: Sold as individual sheets so you order only what the design calls for.

Specifications Table:

Specification Details
Brand Elevate
Sell unit 1 sheet (thickness and size as selected)
Product line Elevate Polyiso Insulation Board
Available colors Not applicable (no color listed for this family)
Available sizes Thicknesses 1.0, 1.5, 2.0, 2.5, 2.6, 3.0 and 4.0 in.; sheets in 4 ft. x 8 ft. (1.0, 1.5, 2.0, 3.0, 4.0 in.) and 4 ft. x 4 ft. (2.5, 2.6, 4.0 in.)
Material Polyisocyanurate foam
Intended use Rigid flat roof insulation for low-slope roof assemblies
Variants 8 items in this family

Coverage & How Much You Need:

A 4 ft. x 8 ft. sheet covers 32 square feet and a 4 ft. x 4 ft. sheet covers 16 square feet. Size the order by dividing the roof area by the sheet coverage, then add waste and account for board staggering and multiple layers.

Fit and Compatibility:

These boards install as roof insulation within Elevate roof assemblies and pair with Elevate membranes and Isogard HD cover board, all sold separately. Sheet size availability varies by thickness.

Frequently Asked Questions (FAQ):

Q: What is included in one order?
A: One rigid polyiso insulation sheet in the selected thickness and sheet size.

Q: How much does a sheet cover?
A: A 4 ft. x 8 ft. sheet covers 32 square feet; a 4 ft. x 4 ft. sheet covers 16 square feet.

Q: What thicknesses are available?
A: 1.0, 1.5, 2.0, 2.5, 2.6, 3.0 and 4.0 inches, with sheet size depending on the thickness.

Q: Is a cover board needed on top?
A: A high-density cover board such as Elevate Isogard HD is commonly installed over polyiso insulation under the membrane and is sold separately.

Q: Can I mix thicknesses for R-value?
A: Thicknesses are chosen per design; verify the required R-value and any membrane or code requirements before selecting a single thickness or a layered build-up.

Expert Verdict — Reviewed by the SuperArbor Pro Desk

Polyiso remains the standard choice for low-slope roof insulation thanks to its high thermal resistance per inch, so pick thickness to match the target R-value and verify it against code and membrane attachment requirements. Keep total assembly height in mind, since adding layers affects flashing and edge heights. Layering boards with staggered joints improves thermal performance and reduces thermal bridging.

Confirm the roof deck, attachment method and R-value requirements against local building codes, and use fall protection when installing insulation on the roof.

Order Elevate polyiso insulation boards in your required thickness and sheet size today.

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All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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