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WA Insulation Requirements in 1999?

Jim Katen

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You need the WSEC Builder's Field Guide 3rd Edition that was published by WSU. The answer depends on where the home is since there are 8 climate zones with different insulation requirements in this state.

Actually, only two climate zones and they both, currently, have exactly the same requirements for underfloor insulation - at least right now - R-30.

I was just surprised to see R-19 under the floor of a 1999 house. I would have expected something more like R-25 to have been required since the early 1990s.

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