Paintable Non-combustible Material For Fireplace Surround? - General Discussion - Contractor Talk

Paintable Non-combustible Material For Fireplace Surround?

 
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Old Yesterday, 10:57 PM   #1
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Paintable Non-combustible Material For Fireplace Surround?


I'm currently working on a renovation where the designer has spec'd a painted fireplace wall with mantle above. This is the first job on my own that involves a built in gas fireplace. I'm running into mixed opinions on how to achieve the look as far as which non-combustible sheet good to use.

The fireplace guys say to use Denshield tile backer to avoid needing to skim the wall and risk the mud cracking. The drywaller says he would use hardibacker and skim it because he hasn't seen any literature to prove denshield is non combustible. After scowering the web I can't find it in writing either.

I'm a few weeks away from drywall so I'll keep researching but would like to hear how others have dealt with this scenario as I think it's fairly common.

Thanks.
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Old Today, 01:09 AM   #2
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Re: Paintable Non-combustible Material For Fireplace Surround?


Isn't denshield fuzzier than drywall? Been a while since I used it

You can't use type x?

-Rich

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Old Today, 01:54 AM   #3
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Re: Paintable Non-combustible Material For Fireplace Surround?


If I recall right we used dense shield around fire places. This was 15 years ago.. I remember using steel studs and some thing like cement board or dense shield. Might be in contact with that builder tomorrow, I'll have to ask.

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Old Today, 04:15 PM   #4
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Re: Paintable Non-combustible Material For Fireplace Surround?


got the fire place manual? it should have specs for the required materials.

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Old Today, 05:16 PM   #5
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Re: Paintable Non-combustible Material For Fireplace Surround?


Dens Shield is not non-combustible... needs to be durock or hardie if you're concerned about that... but check the fireplace manual for sure. Some of the smaller ones hardly put out anything stronger than a cigarette lighter.
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Old Today, 05:40 PM   #6
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Re: Paintable Non-combustible Material For Fireplace Surround?


I just checked our manual, and a youtube. I'd use cement board, skim it, and then heat resistant paint for anything inside 12" of the opening or glass door.

https://www.montigo.com/drive/upload...ons_170223.pdf

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Old Today, 07:33 PM   #7
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Re: Paintable Non-combustible Material For Fireplace Surround?


Venetian plaster. Be a crime to paint it, but it can be colored to just about anything.

https://davinciremodeling.net/firepl...del-denver-co/

Technically, our installation does not meet ASTM -E 136, but we got approval from the building department that the drywall was encapsulated in a non-combustible material.

BTW, I don't believe a painted anything will work. Paint is actually combustible.

Non-Combustible Materials Specification
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in
a Vertical Tube Furnace at 750 ΊC shall be considered
non-combustible materials.


I don't believe Densshield meets ASTM E 136.

If the product data sheets state that it meets ASTM E 136... you're good to go.
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Old Today, 08:01 PM   #8
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Re: Paintable Non-combustible Material For Fireplace Surround?


Thanks guys, I had paper copies of the framing specs and combustible material clearances but looking a bit deeper on their website I just found the cement board and wall finishing detail information. The fireplace is a Valor L1 for what it's worth. I'm not sure why the fireplace company suggested Densheild, I haven't found anything that supports using it. Here is the excerpt from the website, I will call their customer service tomorrow for more information regarding paint etc.

"If a clean finish with no tile, etc. is desired, joints in the cement board and the transition to gypsum board will require special attention if future cracking is to be controlled. Be aware that temperatures on the noncombustible wall surface above the appliance can exceed 250°F. Below are some tips on how to best avoid any cracking: • Allow materials to dry thoroughly before finishing the wall. Cement board has the ability to absorb up to 30 percent of its weight in water and may shrink as much as 1/8” over a 48” length when drying from a saturated condition. Running the fireplace before final finishing will help drive out moisture. • Always pre-drill screw holes through cement board and use screws with self-milling head.
• Always use tape over joints. • Behind joints, double up studs or use studs “on the flat” to add extra support to the joint. Adhesive on the backside of wall board behind any joints can help control differential movement. • Use multiple, thinner coats of joint compound and allow to dry thoroughly between coats. • Ensure framing materials are dry. • After finishing the wall, introduce heat gradually to slowly dry any excess moisture rather than drying too fast. • Avoid notching cement board or tiles around corners of window opening and instead provide a joint that intersects the corner."
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Old Today, 08:24 PM   #9
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Re: Paintable Non-combustible Material For Fireplace Surround?


For interests sake, I just discovered DensGlass sheathing meets astm e 136. Quite possible the fireplace guys meant densglass when they said densheild.
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Old Today, 11:04 PM   #10
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Re: Paintable Non-combustible Material For Fireplace Surround?


What about Durock with a colored cement plaster?

Kind of like DaVinci's project, but with cement backer instead of drywall.

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