Caulk for sealing bottom plate to OSB?

icandoamazong | Posted in General Questions on May 1, 2020 08:33am

What caulk is recommended for sealing the bottom plate to OSB? Any acrylic latex work?

Answer

GBA Prime

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Akos | May 01, 2020 09:38am | #1
For air sealing, I tend to use green glue SEALANT (not the compound, black and orange tube).

I've removed sections that are a decade old and the sealant is as flexible as the day installed. It is also water based unlike most flex sealants.
Jon_R | May 01, 2020 10:55am | #2
I suggest a test. Apply a typical line of sealant, wait 24 hours, squeeze together very hard with clamps, then release. Test for air tightness. I expect that in some cases, sealants that never harden will be pushed out, providing less air sealing than a good +100%/-50% PU sealant (eg Dymonic 100).

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