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Pat from San Francisco, Ca writes

How do I apply Boracare between plywood shear walls?

Interior plywood is attached to studs, 3 inch diameter holes top and bottom currently exist for access. 35 years old. How to protect mud sill, non-PT studs and plywood? Blind spraying?

Answer:

The only way to get Boracare into a wall void would be to use it as a foam. You will need to use a foaming agent and a poly foamer. The mixing ratio is 2:1, meaning 2 parts water to 1 part Boracare. We would recommend using the high expansion formula so there is less moisture. Keep in mind Boracare can only be applied to raw wood.
 

Answer last updated on: 03/23/2016

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