CEMP-ET
TI 809-53
01 May 1999
Table 2-7. Fire Ratings and Required Underlayments for Steep-Sloped Roof Systems
ASTM E108
Underlayments
Class A, B, or
C
Asphalt Shingles
C
No. 15/30 Felt
Asphalt-Organic
A
No. 15/30 Felt
Asphalt-Glass
B/C
Base Sheet
Asphalt Roll Roofing
A
No. 30
Clay Tile
A
No. 30
Concrete Tile
A
No. 30
Slate
Underlayment-?
(a)
Architectural Metal
Underlayment-?
(a)
Crafted Metal
C
(a)
Wood Shakes
C
(a)
Wood Shingles
Underlayment-?
(a)
Metal Look-Alikes
(a)
May require gypsum board or special fire resistant
underlayments for combustible decks.
2-10
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