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Fire Resistant Options For Exposed Foam Board

 
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Old Yesterday, 08:02 PM   #1
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Fire Resistant Options For Exposed Foam Board


Energy rater called for foam board on interior basement foundation wall for residential unfinished area for a spec house I'm doing... Originally called for using foam that is allowed to be left exposed (built in fire barrier) instead of covering with drywall. However, due to scheduling and a local shortage of foam that can be left exposed, we are now stuck with using foam that must have a separate fire barrier (such as drywall.)

So, I could frame out a wall in front of the foam which is an option... But, trying to think of other (cheaper/faster) options:

Has anyone tried any of the following for interior rigid foam (ideally in a residential setting, but, not required), and have thoughts on them?

Intumescent paint

Drywall directly to foam (using strapping or something else)

Other types of fire barrier that gives a "finished" appearance OK for an unfinished basement area (suggestions welcome)

Other options?

Thanks.
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Old Yesterday, 09:24 PM   #2
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Re: Fire Resistant Options For Exposed Foam Board


Intumescent paint can be a good problem solver.

it is expensive & can be difficult to apply.

also be careful that your inspector does not require a special inspector to verify thickness of coating (mils).

the product will indicate how many mils will provide what degree of protection.

can you use tapcons with fender washers to secure drywall to foam?

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Old Today, 02:51 AM   #3
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Re: Fire Resistant Options For Exposed Foam Board


I'd do sheetrock with tapcons. Run tapcons through a decorative trim. Prime, paint and call it a semi finished basement.

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Old Today, 06:04 AM   #4
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Re: Fire Resistant Options For Exposed Foam Board


1x2 furring over the foam board. Doubles as a way to secure the foam in place and allows you to hang drywall as normal.
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Old Today, 07:55 AM   #5
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Re: Fire Resistant Options For Exposed Foam Board


Just frame the walls with 2x4 and stuff with r13. That’s the cheapest route overall.
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Old Today, 08:54 AM   #6
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Re: Fire Resistant Options For Exposed Foam Board


I'm stuck with using foamboard for a couple of reasons.

I'm thinking the following:

Rigid foam to wall

1x2 vertical furring strips 24 on center, fastened through foam into concrete wall with tapcon countersink head instead of standard hex head (so drywall is flush against furring strips)..

Drywall fastened to furring strips normal

sound good?
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Old Today, 08:56 AM   #7
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Re: Fire Resistant Options For Exposed Foam Board


Strapping and drywall over the foam is standard here.
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Old Today, 12:24 PM   #8
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Re: Fire Resistant Options For Exposed Foam Board


This is exactly what galvanized metal zee furring is meant for.
Install the zee furring and insulation, then fasten drywall to the furring to cover everything.
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Old Today, 12:38 PM   #9
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Re: Fire Resistant Options For Exposed Foam Board


Looking them up, z-furring strips sound perfect. Drywall building supply company I use carry them. Thanks!

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Last edited by quantumflux; Today at 12:42 PM. Reason: Found someone that carried them
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