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Customer questions and answers for
DUROCK Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board

The DUROCK Brand Next Gen 5 ft. x 3 ft. x 1/4 in. Cement Board is an ideal substrate for floor and countertop ceramic tile installations. The 1/4 in. thickness helps eliminate transition trim when abutting carpet or wood flooring and minimize level variations with other finish materials. It can be applied directly over old substrate on countertops to save time. It features formed smooth edges and square-cut ends.
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Customer questions and answers for DUROCK Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board

Question

R value of the various thicknesses

Asked by
KeithWDavis
Pennsylvania
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
May 12, 2013
I am installing on floor over radiant heat source and require the R value rating to determine my best option under the floor tile. Please and thank you.
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answer 1
Asked by
USG4YOU-TechnicalSupport
May 13, 2013
Hello Keith and thank you for your question. The R-value of the ¼” Fiberock is 0.2. If you have any further questions please feel free to contact us again.
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answer 2
Asked by
USG4YOU-TechnicalSupport
May 13, 2013
Keith, I am sorry. I meant to say the1/4” Durock has an R-value of 0.2. Thanks again.
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Question

1/4 cement board over 1/2 sheetrock in tub area

Asked by
Hogs
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
February 19, 2014
I saw your answer for using 1/4 inch for tub areas but how about if this product is applied directly over 1/2 sheet rock and then tiled over it. Will it then be strong enough not to flex?
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answer 1
Asked by
OldretiredGuy
Waukesha, WI
Home Improvement Profile: DIYer
June 18, 2014
Before I started my project I watched a lot of youtube video's. I am pretty sure I saw a video where a guy said that CODE requires 1/2 inch cement board in a shower. I'm sure you could get away with using 1/4 inch and it may be fine. BUT You may have a real head ache later. I go by the rule better to it right the first time and not have to worry about possible problems later.
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answer 2
Asked by
USG4YOU-TechnicalSupport
Chicago, IL
February 20, 2014
Hello Hogs, thank you for your question regarding our Durock Cement Board. USG does not recommend installing our Durock Cement Board or Fiberock Aqua Tough Panels in a wet area over a regular Wallboard Panel. Our concern would be that if moisture were to get to the Wallboard Panel 2 things could possibly happen. Mold could begin to grow on the Wallboard, or, if there is enough moisture the Wallboard Panels could begin to decay and affect the walls integrity causing movement in the wall which will adversely affect the tile.
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Question

Can this product be used on the exterior of a room?

Asked by
Countrygirl
Clarkton Mo.
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
June 17, 2014
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answer 1
Asked by
OldretiredGuy
Waukesha, WI
Home Improvement Profile: DIYer
June 18, 2014
Sorry Countrygirl I can't say for sure if you can use ths product for external use. I can only guess that as long as your final project is water proof, there should be no reason why you couldn't.
I would ask the guys at the Home Depot pro desk or even contact the manufacturer directly.
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answer 2
Asked by
USG4YOU-TechnicalSupport
Chicago, IL
June 18, 2014
Hello Countrygirl, thank you for your question regarding our Durock Next Gen 1/4"x3'x5' Cement Board. USG does not recommend using the 1/4" thick Durock on walls or ceilings. The 1/2" or 5/8" thick Durock Panels can be used on interior or exterior walls and ceilings, just follow the installation instructions found in the Durock Installation Guide.
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Question

Are Durock sheets "fire Proof" ???

Asked by
Bob
Colorado Springs
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
March 29, 2013
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answer 1
Asked by
USG4YOU-TechnicalSupport
April 1, 2013
Hello Bob, thank you for your question regarding our Durock Cement Board. Durock Cement Board panels are noncombustible. However, even though the Durock Panels will not burn, they could allow enough heat to transfer through them to allow something behind them such as wood framing to catch on fire. If the Durock Panels are to be used in a Fire Rated Assembly care should be taken to be sure they are being used in an Assembly tested and approved by an organization such as Underwriters Laboratories.
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Question

CAN I use this to install in a shower then install ceramic tile over???

Asked by
LLOYD
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
December 1, 2013
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answer 1
Asked by
USG4YOU-TechnicalSupport
Chicago, IL
December 2, 2013
Hello Lloyd, thank you for your question regarding our Durock Next Gen 1/4"x3'x5' Cement Board. For walls and ceilings we only recommend using either 1/2" or 5/8" Durock Cement Board. The reason for this is the 1/4" panels have too much flex to them because of their thickness. That little extra flex is just enough movement to possibly allow for movement in the wall that could lead to cracking in the tiles or the grout lines. The 1/4" Durock Panels are fine to use for countertops or floors where there won't be any movement possible.
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Question

How do I finish joints and screws on NEXT GEN cement board

Asked by
John
Dodge City KS.
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
May 25, 2014
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answer 1
Asked by
USG4YOU-TechnicalSupport
Chicago, IL
May 27, 2014
Hello John, thank you for your question regarding our Durock Next Gen Cement Board. It is not necessary to finish the fasteners used to install the Durock, but this is how you finish the joints:

Use either the Latex Modified Thin Set Mortar or the Type 1 Organic Adhesive and a Fiberglass Tape marked specifically for use with Cement Board. Apply the tape to the all joints and then spread a thin layer (just enough to cover the tape) of the Mortar or the Adhesive. Allow the joints to dry completely before beginning to install your tiles, stone, etc.
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Question

What is actual dimension of thickness?

Asked by
FemaleDIYer
North Shore MA
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
October 15, 2014
Specs say 1/4" thickness. What is the true measured dimension of product depth? I'm limited in terms of durock thickness + thinset + porcelain tile. As with all other construction materials I'm thinking the actual thickness/depth of product is a little less than 1/4 " - if it is I'm okay to use. My application is thinset to fireplace bricks and apply tile to reface the brick on my fireplace. Thanks.
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answer 1
Asked by
USG4YOU-TechnicalSupport
Chicago, IL
Home Improvement Profile: Professional
October 16, 2014
Thank you for your question. The Durock is 1/4" thick, however USG does not have recommendation for using the 1/4" Durock on a wall. The 1/4" Durock cement board products are only for interior construction applied to minimum 5/8" exterior-grade plywood or OSB subfloor. USG also recommends fasteners 8" o.c. to secure the board to the subfloor. Again, the 1/4" Durock cement board should not be used for wall or ceiling applications. For wall or ceiling applications, use 1/2" or 5/8" Durock cement board. I hope this helps.
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