Tyvek on Block walls
This was a comment by a Florida Building Official on waterproofing block walls.
"Masonry is by it's nature porous and is not a good vapor barrier. My assumption is that in addition to the Tyvek, some sort of siding, brick or other finished material is planned other than stucco. " What are your thoughts?
You would never put tyvek on a masonry wall. I have never heard or seen such a thing. The code does not require a “vapor barrier” on cmu . Your block either has integral water repellent in combo with an exterior sealant/paint ----- or ------ it is stucco’d in which case the stucco and paint in combo with the cmu becomes the water/vapor barrier ------ or---------- you put brick on the outside with a roll on barrier ------ or---------- if you are using direct adhered stone or thin brick you use a product that seals the wall and adheres the stone or thin brick.
In all cases, other than at cracks - which need to be addressed in the design, the wall is water tight and sufficiently vapor tight to keep the interior dry.
11/3/2021 11:47:19 pm
I agree that you don’t have to put Tyvek over cmu but you could if you wanted to. Agreed that there would be added expense but in certain situations it can make sense.
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Jerry Painter, FASTM
Don Beers, PE, GC