Is Durock Rated For Exterior Use?


Can USG Durock® Brand Cement Boards be used on the interior and exterior of buildings? Yes. They can also be used in below-grade applications such as basements. Below grade in this application does not include direct ground-contact applications.


Depends what you are planning. If you plan to put stone or stucco over the Durock, then perhaps the answer is yes. Durock has several products that can be used in exterior applications.

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Frequently Asked Questions

Can cement board be used on exterior walls?

One of the major advantages that you will get by using cement board for an exterior wall is durability. ... Once you install the cement board, you can also apply a number of different finishes to its surface. For example, you can choose to paint the cement board or apply a stucco finish to it.

Can durock be exposed to weather?

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.

Can cement Fibre board be used outside?

Fibre cement as an exterior cladding material It is also resistant to termites, woodpeckers and other pests. In addition, fibre cement cladding is a fire resistant building material and will not ignite when exposed to direct flame or extreme heat: it is a non-combustible material.

Is Durock cement board waterproof?

A moisture barrier is necessary with any cement board product. If you do not have plastic or roofing felt behind it, then a liquid-applied membrane is in order. Durock is indeed waterproof, meaning it is not harmed by water.

When to use USG Durock cement board exterior?

USG Durock® cement board is intended for use with tile, thin brick and exterior stucco coatings only. From Durock install instructions that fit this exterior install….. of time exceeding 90 days. Discoloration or staining may occur due to exposure to the elements which will not affect performance of the panel.

Which is better Hardie backer or Durock board?

As a bonus, HardieBacker board has an EZ Grid pattern so you can cut perfect lines. The makeup of HardieBacker also has the advantages of flexibility and strength. It is lighter and more flexible than its competitor, which makes for easier and efficient installation without sacrificing integrity.

Can you use drywall joint tape on USG Durock?

Do not use drywall screws or drywall nails. Do not use drywall joint tape. 9. Do not use 1/4" USG Durock® cement board for wall or ceiling applications. 10. Do not use USG Durock® cement board with vinyl flooring. 11. USG Durock® cement board is not designed for use as a structural panel. 12.

How big are USG Durock tile backer screws?

USG Durock™ tile backer screws for steel framing can be used with steel framing where steel thickness is from 14- to 20-gauge; they come in two lengths: 1-1/4" and 1-5/8". Both wood and steel screws have heads a minimum of 0.40" in diameter; their driving recess is a No. 2 “Phillips” design.

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