Asked by: Carlito Bertoni
asked in category: General Last Updated: 12th March, 2020

Can cement board get rained on?

Most brands of concrete backer-board consist of a fibrous reinforcement cement composition molded into sheets. It is extremely hard and waterproof, meaning it will not deteriorate over time when exposed to water, making it ideal for use in high-traffic areas that are susceptible to the adverse effects of moisture.

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Also know, can durock get rained on?

Finishes, leveling/skim coats and basecoats should not be applied to DUROCK cement panel that is wet or frozen or that contains frost. After application, and for at least 24 hours, finishes, leveling/skim coats and basecoats should be effectively protected from rain and excessive moisture.

One may also ask, are cement boards waterproof? Cement boards may be classified as water resistant as in not affected by water exposure; however, they do allow penetration and passage of water and water vapor. To waterproof cement boards, a liquid or membrane waterproofing material is applied over its surface.

Similarly one may ask, can cement board be left in rain?

The rain won't intrinsically hurt it but mud and other particles could ruin some of the ability for the thinset to adhere. Protecting building materials from water and weather elements is important.

Do I need to waterproof cement board in shower?

“A waterproof membrane or vapor retarder membrane must be specified to prevent moisture intrusion and protect adjacent building materials.” ~B412 Bathtub or shower with prefabricated receptor. Cement board or Fiber-cement board. Consult local building code for moisture barrier requirements.”

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