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Natural slate

Its weight

The table
900 lb a squareThe sources give 700 to 1,200 lb.
Loose volume
Not known: it counts in the tons aloneNo source found gives a loose density for torn-off slate. Dumpsters.com's 4 to 6 squares in a 10-yard dumpster is a weight limit, not a volume.
How it was chosen
The National Slate Association's 1926 table weighs standard 3/16" slate at 700 lb a square and 1/4" at 1,000 lb (ASCE 7 gives 7 and 10 psf); Xactimate disposes of a torn-off square at 1,198 lb; Dumpsters.com gives 800 to 1,000 lb. 900 lb is the figure. Weight follows the slate's thickness, not its length, so both lengths take it.

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.

4 sources

  1. 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

    Rows "Slate, 3/16" (standard)": 700 lb/square; "Slate, 1/4"": 1,000 lb/square; "Slate, 3/8"": 1,500 lb/square; source named: Slate Roofs (National Slate Association, 1926).

    The document An archived copy

  2. Tech Note GE-1: Product Weights (weights of building materials for dead loads, (c) 2021)

    Boise Cascade Wood Products; rows marked (1) cite ASCE 7-16 Table C3.1-1a, sheathing rows (3) cite APA EWS TT-019 (1998) · estimating guide · read 2026-10-23

    ROOF: "3/16" slate (1) 7" "1/4" slate (1) 10" Footnote (1): "Minimum Design Loads for Buildings and Other Structures, ASCE 7-16, Table C3.1-1a." Values are pounds per square foot.

    The document An archived copy

  3. Xactimate price list item RFG SLARMV

    Verisk Xactimate, as Roofometry keeps it · estimating guide · read 2026-10-23

    RFG SLARMV, "Tear off, haul and dispose of slate roofing." Definition: "Includes: Dump fees, hauling, disposal, and labor to remove slate roofing." Dump fee component DMOFEE, direct_yield "1.670 SQ/TN".

    A copy is kept with Roofometry.

  4. How Much Do Shingles Weigh?

    Dumpsters.com · trade publication · read 2026-10-23

    Three-Tab Asphalt: "230-250 pounds" per square, "50-80 pounds" per bundle; Architectural Asphalt: "400-430 pounds" per square; Slate: "800-1,000 pounds" per square. "A 10 yard roll off dumpster can hold approximately 10 to 15 squares of asphalt shingles, or 4 to 6 squares of slate shingles." "The exact weight per bundle or square of shingles depends on the manufacturer."

    The document An archived copy