0

I was asked to paint an exterior of a cinder block chimney and need to find out what type of exterior coating will allow water vapor pass through the block so that it doesn't ruin it from the inside out.

  • Hello, and welcome to Home Improvement. Unfortunately, "shopping" questions are off-topic here. Please take our tour so you'll know how better to contribute here. – Daniel Griscom Jun 10 at 1:23
  • 2
    I reworded to try to make the question a technical question as opposed to a shopping question. – Jimmy Fix-it Jun 10 at 2:23
1

Any "breathable" exterior coating will work. The traditional one is limewash, others are silicate paint, or silane-siloxane sealer as mentioned by @LeeSam.

0

You want to use a silane-siloxane sealer. You need a sealer that is penetrating (will provide better uv protection) to keep water out, yet still be breathable.

This explains it better: https://www.masoncontractors.org/2016/11/25/benefits-of-silane-siloxane-sealer-for-older-brick-buildings/

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.