Fire Endurance Tests of Unprotected Wood-Floor Constructions for Single-Family Residences. Final Report. Revision of NBS 10 320.
Fire Endurance Tests of Unprotected Wood-Floor
Constructions for Single-Family Residences. Final
Report. Revision of NBS 10 320.
Son, B. C.
NBSIR 73-263; 70 p. July 1973.
Sponsor:Department of Housing and Urban Development, Washington,
Order number: PB-225284
fire endurance; fire tests; flame through; large scale
fire tests; Operation Breakthrough; single family
dwellings; small scale fire tests; thermal resistance;
Fire endurance tests were performed on two full-scale
and twelve small scale wood floor constructions. The
fire endurance ratings on unfinished wood joist and
plywood subfloor constructions varied from 10 to 13
minutes and were mainly determined by the time to "flame
through." In small-scale tests, the addition of
carpeting with a hair pad delayed the time of "flame
through" approximately 8 minutes. Time to "flame
through" may be estimated from the thermal resistance of
the construction, and may be modified by the effects of
applied load or construction details such as gaps,
joints, and penetrations.