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Polyiso insulation board, 4"

Its weight

The table
64 lb a squareThe sources give 64 to 77 lb.
Loose volume
Not known: it counts in the tons aloneNo source found gives a loose volume for torn-off polyiso board; it comes off in broken pieces of its own thickness.
How it was chosen
Johns Manville's ENRGY 3 (foil-faced GRF) weighs 0.64 lb a square foot at 4", the figure; Siplast's polyiso 0.216 lb a square foot an inch gives 86.4 lb; JM's coated-glass-faced CGF board, 0.77, is the high end.

Your figure

None: estimates use the table's.

Give your own figure
For each square of roof, or each sheet of decking.
Loose, as it lands in the dumpster, for each square or each sheet.
Your scale tickets, your hauler's figures: what a reader would check it against.

2 sources

  1. RS-9417 Product Weight Charts (10-25)

    Johns Manville · manufacturer spec sheet · read 2026-10-23

    ENRGY 3 Insulation, Thickness 4: "ENRGY 3 GRF 0.64" "ENERGY 3 CGF 0.77" (nominal weight lb/ft²)

    The document An archived copy

  2. Weight of Roofing Materials: Comprehensive Reference Table (Jack Gray, RRO; first published 12/09/2025, updated 12/24/2025)

    Roof Observations · trade publication · read 2026-10-23

    Row "Polyisocyanurate, per inch": 0.216 lb/ft², 21.6 lb/square; source named: Siplast.

    The document An archived copy