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Built-up gravel surfacing with its flood coat

Its weight

The table
460 lb a squareThe sources give 400 to 571 lb.
Loose volume
0.16 cubic yards a square
How it was chosen
The surfacing is laid at 400 lb of gravel in a 60 lb flood coat a square (RCABC, Roofing Contractor; up to 500 lb of gravel); Xactimate disposes of torn-off gravel at 571 lb a square (3.5 squares a ton). 460 lb is the laid rate. The volume is the gravel alone, 400 lb at Seattle's 2,565 lb a cubic yard for loose gravel.

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.

5 sources

  1. Membrane Surfaces

    Roofing Contractors Association of British Columbia, Roofing Practices Manual · industry association · read 2026-10-23

    Single pour and gravel: "a pour coat of 3.0 kg / m2 (60 lb / square) asphalt with 20 kg / m2 (400 lb / square) of gravel"; alternate modified double pour: "a 25 kg / m2 (500 lb / square) application of gravel"

    The document

  2. Technical Details: Aggregate Surfacing for BURs (John D'Annunzio, August 29, 2007)

    Roofing Contractor · trade publication · read 2026-10-23

    "Aggregate should be applied at a rate of 400 to 500 pounds per roof square." Flood coat "applied at a rate of 60 pounds per roof square for asphalt systems and 70 pounds per roof square for coal-tar systems."

    The document An archived copy

  3. Xactimate price list item RFG BUGRMV

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

    RFG BUGRMV, "Tear off, haul and dispose of gravel ballast." Definition: "Includes: Dump fees, hauling, disposal, and labor to tear-off built-up gravel ballast roofing." Dump fee component DMOFEE, direct_yield "3.500 SQ/TN".

    A copy is kept with Roofometry.

  4. 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 "BUR, 3-ply, gravel-surfaced": 600 lb/square and "BUR, 3-ply, smooth-surfaced": 233 lb/square; sources named: Owens Corning; GAF.

    The document An archived copy

  5. General Measurement Standards and Reporting Guidelines: Volume and Weight Conversion Factors for Recyclables

    City of Seattle, Seattle Public Utilities · government · read 2026-10-23

    "Gravel or rock, loose | one cubic yard | 2565 | Tellus" Footnote 1: "Disclaimer: This table is for general guidance only. Not for contract payment."

    The document An archived copy