Select and document a code-compliant underlayment type (organic felt, synthetic, or self-adhered) for a steep-slope reroof, citing the correct ASTM designation.
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Identify which underlayment category is being used: asphalt-saturated organic felt, synthetic (non-bitumen) sheet, or self-adhering polymer-modified bitumen.
For asphalt-saturated felt, confirm the product label cites ASTM D226 (asphalt-saturated organic felt) or ASTM D4869 (asphalt-saturated organic felt underlayment used specifically in steep-slope roofing).
For self-adhered ice/water membranes, confirm the product label cites ASTM D1970 (self-adhering polymer modified bituminous sheet materials for steep roofing underlayment/ice dam protection).
For synthetic (non-bitumen) underlayments, verify the code path via the product's current ICC-ES evaluation report or code-listed equivalency, since synthetics are typically approved as code alternates rather than under D226/D4869/D1970 directly.
Confirm the labeled ASTM designation and type classification on the delivered roll matches what was specified, not just the product's marketing name.
Known gotchas
Don't assume all synthetic underlayments are covered by a single ASTM number — many rely on an ICC-ES evaluation report instead; check the specific product's current report.
'No. 15' and 'No. 30' felt are legacy trade names, not literal weights — confirm the actual ASTM type/designation printed on the roll label rather than the marketing term.
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