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CMU Waterproofing Question

3/16/2022

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The contractor wants to use a split face unit for the single wythe load-bearing walls of a small building with two ADA restrooms and a small storage room for a private park. The building will be ventilated only. My concern is moisture intrusion into the interior spaces. The walls are not insulated.
Will a waterproofing coating at the exterior and the use of a waterproofing additive to the mortar keep water out of the wall system?
Is there an additive that can be added during the mixing and forming of the wall units?
​Some think that a single-wythe CMU wall cannot be effectively built to repel moisture. It can. I am attaching a NCMA TEK that can be very helpful. Water repellant is typically put into architectural CMU as a standard procedure especially if the units are colored. You MUST add the repellant to the mortar also. When this is done and you add a compatible flashing at the base of the wall. you should have the wall you are trying to get. If you want to stain or paint the wall I would suggest an elastomeric coating as it will bridge any small voids. You should contact Lisa Pelham (813-255-4737) @ Oldcastle or Daryl Gorenflo (407-280-1487) @ A-1 Block. Either are more than willing to help you, TIf I can also help I'm in Gainesville. Call me. Be safe.
Jerry Painter, FASTM,CGC, SMC
352-494-8955 
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    Authors:

    Picture
    Jerry Painter, FASTM
    352-378-7511
    painterjm@gmail.com 

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    Don Beers, PE, GC
    561-310-9902
    don@floridamasonry.com

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