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February 13 - February 17, 2017

Can lightweight block (CMU) be successfully coated to prevent water intrusion, or is it best to build with standard weight?

Selected Answers

From Zenith Czora of Durotech Industries, Inc. on February 15, 2017:
For vertical walls, yes, you can build with lightweight block.. First, you seal the substrate with a special type of water-repellent sealer which does not  act only as a sealer but also as a primer. This sealer repels bulk liquid water but still allows the substrate to breathe to allow vapor to permeate. There are already various coating systems for light weight blocks. Fiber-reinforced skim coat or render can be used as a base coat to improve impact resistance, Then it can be topcoated with tintable, flexible texture coating and/or breathable elastomeric wall coating.

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