All COLORED block made in Florida Contains integral waterproofing. The assumption you MUST make is that if the block is not colored it will not contain integral waterproofing. EVERY block that is used in a single wythe installation SHOULD contain integral waterproofing --- even if it is going to be painted or sealed. So…. If you are designing a single wythe wall that does not contain integral color be sure to request integral waterproofing!! ONE more thing --- EVERY single wythe wall SHOULD be painted or sealed.
Remember – Single Wythe -- Integral Waterproofing --- Painted and Sealed -- ALWAYS.
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.
Jerry Painter, FASTM
Don Beers, PE, GC
Find out more about Masonry
Pre-Apprentice Programs by visiting: