We have 2x4 wood studs which are spaced 16-inches on center. There's a layer of 3/8" gypsum board on each side, plus on one side there's 1 layer of 3/8" plywood (douglas fir).
How do I determine the fire resistance rating of this partition assembly? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
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Brian M.
11/12/2019 12:20:57 pm
Reference: 5th Edition SFPE Handbook of Fire Protection Engineering pg 1981.
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11/12/2019 01:02:45 pm
Why each side has different FRR? why the side with plywood got higher FRR?
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In non-legal jargon, a fire starting in the room with the plywood has to burn through the 5 minute plywood before getting to the 40 minute wall. The fire takes 45 minutes to burn through before hitting flammable material.
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Back in the early 1980s the Dept. of Housing and Urban Development (HUD) published their Fire Ratings for Archaic Materials Guide: https://www.huduser.gov/Publications/PDF/fire.pdf.
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