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

Durock Brand 1/4 in. x 3 ft. x 5 ft. Cement Board is an ideal mold- and moisture-resistant substrate for floor and countertop ceramic tile installations. It cuts easily and installs quickly. The 1/4-inch thickness helps eliminate transition trim when abutting carpet or wood flooring and minimizes level variations with other finish materials.
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Customer questions and answers for DUROCK Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board

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
georgeodjungle
portola, ca
March 23, 2015
tape with fiber glass mesh top with thin set like sheetrock it's all in the tile section
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answer 2
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

I am looking to use this product for my walls to cover old clap board. What can I surface this cement board with? I read that mortar will not adhere?

Asked by
Chris
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
February 9, 2015
What product can I use for a skim coat plaster look finish ? Can I use spakle?
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answer 1
Asked by
georgeodjungle
portola, ca
March 23, 2015
yes with thin set & use admix
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answer 2
Asked by
USG4YOU-TechnicalSupport
February 11, 2015
Hello, thank you for your question regarding our 1/4" 3'x5' Durock Cement Board. First off, we do not recommend using the 1/4" Durock on walls or ceilings. We only recommend using the 1/2" or 5/8" thick Durock on walls and ceilings. You can use a Latex Modified Thin Set Mortar over the Durock to achieve a plaster looking finish over the Durock. Just be sure to follow the Mortar's Manufacturers recommendations for mixing and applying their product. A Latex Modified This Set Mortar will bond exceptionally well to Durock.
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Question

How many pieces are in one pack?

Asked by
Meli
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
June 22, 2015
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answer 1
Asked by
CommunityAnswer
June 22, 2015
This product is sold individually.
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answer 2
Asked by
USG4YOU-TechnicalSupport
June 22, 2015
Hello Meli, thank you for your question regarding our Durock Next Gen 1/4" 3'x5' Cement Board. These panels are shipped 60 pieces per pallet. Durock is sold by the individual piece.
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Question

R value of the various thicknesses

Asked by
none
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
Keith, I am sorry. I meant to say the1/4” Durock has an R-value of 0.2. Thanks again.
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answer 2
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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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
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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answer 2
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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Question

The instruction say not to use with vinyl, why is that?

Asked by
Alan
Kent, Washington
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
September 8, 2015
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answer 1
Asked by
CommunityAnswer
September 11, 2015
It is not recommended because the Durock cement board is too smooth.
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answer 2
Asked by
USG4YOU-TechnicalSupport
September 9, 2015
Hello Alan, thank you for question regarding our 1/4" Durock Next Gen Cement Board. The reason we don't recommend using Durock Cement Board underneath a vinyl floor is because the surfaces of the Durock are left rough to better accept the Type 1 Organic Adhesive or Latex Modified Thinset Mortar that is used to install tiles, stone etc. The roughness of the Durock will eventually telegraph through the vinyl floor and your vinyl floor will look like the surface of the Durock.

Instead of using Durock, we would recommend using Fiberock Underlayment beneath your vinyl floor. The Fiberock has a nice, smooth surface and willnot ruin the look of your vinyl floor.
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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

can I use 1/4" cement board behind kitchen tile back splash?

Asked by
gogo
baltomore. md
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
September 25, 2015
I saw a previous response that you do not recommend using the 1/4" Durock on walls or ceilings. We only recommend using the 1/2" or 5/8" thick Durock on walls and ceilings. I wanted to use it on my kitchen wall for mosaic tile back splash between my counter top and cabinets. 1/4" seemed like the way to go.
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answer 1
Asked by
USG4YOU-TechnicalSupport
September 28, 2015
Thank You for your email.
We do not recommend the use 1/4" Durock cement board for wall or ceiling applications
it is not tested in this type of application.
I hope this helps.
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Question

Should I use any vapor barrier underneath if the floor is over an unheated garage?

Asked by
Don
Tallahassee, FL
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
September 19, 2015
My bathroom has old felt vapor barrier under the subfloor. I am replacing some of the subfloor. Should I add a vapor barrier beneath subfloor or cement board if the room below is an unheated garage? I am in high humidity, Tallahassee.
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answer 1
Asked by
USG4YOU-TechnicalSupport
September 22, 2015
Hello Don, thank you for your question regarding our Durock Next Gen Cement Board. We would recommend checking with your local Code Official to see what your city's Building Codes require. Durock will perform equally well with or without the presence of a vapor barrier.
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Question

Can i use a nail gun to fasten the cement board?

Asked by
Teelee
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
July 17, 2015
I am putting tile in a new build and need additional sub floor. I was going to use ext plywood. Can I use a air nailer to fasten the cement board to the current subfloor
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answer 1
Asked by
USG4YOU-TechnicalSupport
July 20, 2015
Hello Teelee, thank you for your question regarding our Durock Next Gen Cement Board. USG recommends using Cement Board Screws or galvanized roofing nails to fasten Durock panels that have been set down in a bed of Latex Modified Thinset Mortar. Our complete Durock Installation Guide can be found on the Product Page on this website.
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Question

freestanding tile mural backing

Asked by
Smoreo
SF Bay Area
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
October 28, 2015
I have several pieces of glazed ceramic tiles that I want to assemble into a 'painting' that will be hung on a fence. I live in the SF Bay Area, and will never see freezing temperature. The finished 'painting' will be about 36" by 18" and the tiles are irregularly shaped, each approximately 45 to 50 square inches. Can I use Durock board for this purpose? 1/4" or 1/2"? Do I need to put the board over an outdoor grade plywood, or will the board be strong enough to stand alone? If I do not need the plywood, do I need to seal the back side of the Durock board? BTW, I'd like to put a painted wood frame around it, maybe made of 2" by 2", so I could screw the board onto a frame (say, made of 1" by 2") on the back and have the exposed frame screwed onto that hidden frame. .
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answer 1
Asked by
USG4YOU-TechnicalSupport
November 9, 2015
Thank you for your question.
We would not recommend Durock in this application for the reason it can not be left exposed to the elements. It has also not been tested it for this application.
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Question

What is actual dimension of thickness?

Asked by
NSGardener
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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Question

What is the thermal expansion coefficient of the lighter Durock material ($9.97/sheet) compared to the Hardibacker material ($11.97/sheet)?

Asked by
klchemskyr
Los Angeles
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
June 9, 2015
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answer 1
Asked by
Durock Technical Support
December 16, 2015
Thank you for your question.Please see the details below on the R &K values.

5/8-49/1.27
1/2- 0.39/1.27
Per ASTM C518
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Question

Over vinyl

Asked by
Chris
Indianapolis
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
December 25, 2015
Do I need to remove the vinyl floor covering before I install this product for a new tile floor
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answer 1
Asked by
USG4YOU-TechnicalSupport
December 28, 2015
Thank you for your question.We recommend removing the vinyl first.Durock is not recommended over this.I hope this helps.
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Question

Can the 1/2" board be bent and secured over a 6-foot radius, or can the 1/4 " be used?

Asked by
aenigman
San Diego
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
December 26, 2015
I'm researching the possibility of using this product on an outdoor circular seating area that will be 12-13 feet in diameter, 40 inches high. Plan to build metal or wood stud structure, attach cement board, then attach stone veneer to the Durock.
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answer 1
Asked by
USG4YOU-TechnicalSupport
December 28, 2015
Thank you for your question.Please see bending radius information below.
For 5/8 and 1/2 =Minimum bending radius ft. (requires special framing
details available upon request) — 6

For the 1/4 Not recommended to be used on walls.
I hope this helps.
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Question

Basement Floor

Asked by
Joe
Rosedale MD
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
December 29, 2015
Can I put this over a cement basement floor that gets wet once in awhile? Then tile it.
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answer 1
Asked by
USG4YOU-TechnicalSupport
December 30, 2015
Thank you for your question. Durock can be used as a tile backer for tile work,but not intended to be left or submerged unfinished in water.
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Question

I am using the 1/4 Durock over a 3/4 inch plwood sub floor. Do you still suggest using thin set to put it down? Srews or nails?

Asked by
Joe
Alabama
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
January 6, 2016
I do not know if construction Glue would be better doesn't the water in the thin set get sucked into the plywood?
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answer 1
Asked by
USG4YOU-TechnicalSupport
January 7, 2016
Thank you for your question.We recommend that the thin set be used on the install.
If the correct thin set is used which modified you will not have any issues, screw or nail is a option either one will work.Just make sure the correct type is used per the installation guide.
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Question

fireproof ?

Asked by
installer
about Next Gen 1/4 in. x 3 ft. x 5 ft. Cement Board on
January 7, 2016
I am installing a fireplace insert and want to use this to enclose the old fireplace in back of and to the sides of the new insert with insulation behind. Is there any reason that this would be a bad idea ? It says non combustible but was wondering about repeated exposure to high heat. would be painted with refractory paint.
thanks
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answer 1
Asked by
USG4YOU-TechnicalSupport
January 11, 2016
Thank you for your question.I'm sorry Durock is not a paintable product it is good up to 200F
it is recommended to be tiled or with a plaster finish.
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