Creeping up on it slowly. Sheetrocker are coming tomorrow (won't actually start hanging for a few days) . Our electrician is perplexed at how to hang fixtures from the ceiling. He's afraid a standard box/screws will not hold in the OSB especially with a ceiling fan (which we are not having but I suppose somebody down the road could have). The boxes I. There now fit flush with the osb and he says we need 1/2" lip for the drywall. Is there a standard way to do this? Type of box to use? Thanks!!

Is the ceiling furred or are you attaching the drywall directly to the OSB roof SIP?

Posted By haese56 on 23 Oct 2012 09:29 PM
Creeping up on it slowly. Sheetrocker are coming tomorrow (won't actually start hanging for a few days) . Our electrician is perplexed at how to hang fixtures from the ceiling. He's afraid a standard box/screws will not hold in the OSB especially with a ceiling fan (which we are not having but I suppose somebody down the road could have). The boxes I. There now fit flush with the osb and he says we need 1/2" lip for the drywall. Is there a standard way to do this? Type of box to use? Thanks!!

Your electrician should know what a 1/2" plaster ring is?

No the drywall is going directly on the OSB. We also did not fur the walls which I am totally glad for. It's unbelievable that that was even contemplated. Putting some outlet and switches in an outside wall was a minor inconvenience .......vs furring the whole place in?......are you kidding me?!?!?!?!?!?

Posted By haese56 on 26 Oct 2012 11:41 AM
No the drywall is going directly on the OSB. We also did not fur the walls which I am totally glad for. It's unbelievable that that was even contemplated. Putting some outlet and switches in an outside wall was a minor inconvenience .......vs furring the whole place in?......are you kidding me?!?!?!?!?!?

People sometimes furr the ceiling so that they can run electrical or canned lighting. Furring the ceiling also helps with noise issues which SIPs sometimes have in the ceiling area.

haese56; After the home is finnished ...adding a recepatcle or light switch on a furred wall/ceiling is easily accessible, without it, it is a small remodeling job and can create structural problems if not done by someone knowledgeable with SIP construction. an ounce of prevention?

Posted By cmkavala on 26 Oct 2012 04:27 PM
haese56; After the home is finnished ...adding a recepatcle or light switch on a furred wall/ceiling is easily accessible, without it, it is a small remodeling job and can create structural problems if not done by someone knowledgeable with SIP construction. an ounce of prevention?

Good point. I plan on furring the SIP ceiling with hat channels so that I can access the area to run conduit, in addition to providing soundproofing.

For 5/8" ceiling drywall, how close would you run the furring strips or hat channels and how deep should they be? I was thinking 1.5" deep hat channels in order to provide some soundproofing. Do you have any details showing hat channels being attached to a steel SIPs?

 

haese56, Here is a photo of a 5/8" plaster ring for a ceiling fixture.

haese56, If your electrician used this box you're going to have problems supporting anything heavy. Furring out the ceiling allows a surface mount box to be used like this which allows on center fastening of the box with heavy screws or spread anchors.

When ceiling fixtures are required and using metal SIPs, furring is the recommended method. If you want to go all metal construction, this is how you do it. If you are ok with a wood/metal hybrid system for ease of contruction and better sound control, use this detail.

Posted By SimonD on 28 Oct 2012 02:01 PM
When ceiling fixtures are required and using metal SIPs, furring is the recommended method. If you want to go all metal construction, this is how you do it.  If you are ok with a wood/metal hybrid system for ease of contruction and better sound control, use this detail. 

THANKS for the details!

Wouldn't the metal hat channels provide BETTER sound control over the wood strip furring channels because of decoupling?

We're hanging relatively light ceiling fixtures no fans, no cans....

In my opinion and experience metal tends to resonate with metal and transfer vibration, but the change in material type to wood tends to short circuit that. However, there are the metal 'resilient' furring channels especially designed for sound control. Those are the 'Z' shapped ones with slots.

Here is a photo of a resilient channel (RC)

Posted By SimonD on 28 Oct 2012 11:40 PM
In my opinion and experience metal tends to resonate with metal and transfer vibration, but the change in material type to wood tends to short circuit that. However, there are the metal 'resilient' furring channels especially designed for sound control. Those are the 'Z' shapped ones with slots.

The 2x3 or 2x4 wood seems to provide a better grip to screw 5/8" drywall ceilings to than a metal hat channel would.

I've seen hat channels that have rubber isolators to even further decouple the materials for better sound control. One drawback with the resilient hat channel is that the channel is attached every 48” by a resilient clip, this 48” span is allowed to flex slightly. That can't be a good thing in a ceiling drywall install.




Can a ceiling Steel Roof SIP that is furred with 2x3 or 2x4 wood furring strips support 5/8" drywall AND a T&G wood ceiling? Or would the screws in the 2x3 wood furring strips want to pull out of the 26 gauge steel SIP?

Lbear; 2x's do not attach well to metal SIPs, steel on steel is the best attachment and have the best screw pull out values

Posted By cmkavala on 29 Oct 2012 06:36 AM
Lbear; 2x's do not attach well to metal SIPs, steel on steel is the best attachment and have the best screw pull out values

Why does wood not attach well to metal SIPs?

Can those hat channels hold 5/8" drywall plus wood T&G ceiling panels or is there risk of them pulling out of the SIP or causing sag?

Posted By Lbear on 29 Oct 2012 11:42 AM

Posted By cmkavala on 29 Oct 2012 06:36 AM
Lbear; 2x's do not attach well to metal SIPs, steel on steel is the best attachment and have the best screw pull out values

Why does wood not attach well to metal SIPs?

Can those hat channels hold 5/8" drywall plus wood T&G ceiling panels or is there risk of them pulling out of the SIP or causing sag?

Yes, 7/8" or 1-1/2" x 25 ga. steel hi-hat can hold ceiling fans, it will certainly hold ceiling weight

Posted By cmkavala on 29 Oct 2012 01:10 PM


Yes, 7/8" or 1-1/2" x 25 ga. steel hi-hat can hold ceiling fans, it will certainly hold ceiling weight

What do you think of this product?

Resilient Sound Isolation Clip

They claim it is 36 LBS per clip for design load. It uses only one screw but has a rubber isolator.



Or do you think this one would work better?

Soundproofing Company WhisperClip

This one uses TWO screws to hold the clip but does not include a rubber isolator.

Posted By Lbear on 29 Oct 2012 06:27 PM

Posted By cmkavala on 29 Oct 2012 01:10 PM


Yes, 7/8" or 1-1/2" x 25 ga. steel hi-hat can hold ceiling fans, it will certainly hold ceiling weight

What do you think of this product?

Resilient Sound Isolation Clip

They claim it is 36 LBS per clip for design load. It uses only one screw but has a rubber isolator.



Or do you think this one would work better?

Soundproofing Company WhisperClip

This one uses TWO screws to hold the clip but does not include a rubber isolator.

Lbear; Is there a reason you are going to great lengths to achieve soundproof?