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#59289 - 12/01/05 07:07 PM Laminated beam and fan box...  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
This fairly common box is rated for 75# fans & 200# fixtures.
http://www.aifittings.com/whnew51.htm


Assuming properly drilled pilot holes, would installing one on the bottom of a glue-lam provide the full support rating?

I'm envisioning the laminations separating as the screw enters the piolt hole, and the threads possibly not engaging the wood around their whole circumference.

The fixture in question is probably somewhere between 75 & 100 lbs.

Thanks.


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#59290 - 12/01/05 07:44 PM Re: Laminated beam and fan box...  
Active 1  Offline
Member
Joined: Feb 2003
Posts: 687
Grayslake IL, USA
I would think it would be fine. With the extra weight it would not hurt to nail or screw a 2x block on the side with out the connector. Then screw into that also.

Tom


#59291 - 12/01/05 08:04 PM Re: Laminated beam and fan box...  
Tiger  Offline
Member
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I pre-drill to the OD of the screw shaft. Then the threads are fully engaged without splitting the wood. In a very heavy fixture I'd try to figure a way to screw the fixture mounting bracket through the box and into the beam. Then the fixture is hanging by more than the 10-32s in the box.

Dave


#59292 - 12/01/05 09:10 PM Re: Laminated beam and fan box...  
LK  Offline
Member
Joined: Jan 2003
Posts: 1,429
New Jersey
What it appears is, that none of the methods used with standard construction is correct, the recommended method will be by each indivisual manufacture of the lam support,
we were working at a site one day when a company engineer was there explaining the proper way to support mechinical equipment including ceiling fan's

Here is a good site to look http://www.boozerbeam.com/techsupport.htm
It is a supprise to find out that the top of the Lam is where they want it supported not at the bottom, and also notice the critical areas.


#59293 - 12/02/05 12:01 AM Re: Laminated beam and fan box...  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Assuming properly drilled pilot holes, would installing one on the bottom of a glue-lam provide the full support rating? I'm envisioning the laminations separating as the screw enters the piolt hole, and the threads possibly not engaging the wood around their whole circumference.

Just what are the dimensions of this beam where you are installing the box? If at least as wide as regular 2x lumber I can't see a problem. Even though it's laminated it can be considered as solid as regular lumber so I don't think you are going to have a problem with it separating. It ain't going to come apart.

LK, I don't think what you provided applies here, this really isn't that heavy.

-Hal


#59294 - 12/02/05 01:36 PM Re: Laminated beam and fan box...  
macmikeman  Offline
Member
Joined: Jul 2002
Posts: 717
Honolulu, Hawaii
75 or 100 lbs is far more in weight than the typical ceiling fan found at box stores. I have hung many Hunter Originals that were up there though. If we are that worried that the wood screws would come out of the lam, perhaps you could provide an additional support by using a standard Simson strap that wraps around the beam at the point where you are mounting the box. The additional side screws or nails of the strap will provide the strength to hold the lam. Now drill and tap the Simson tie to hold your box with a substantial hole such as maybe a 1/4- 20 thread. Use a fan rated box like the one in the picture.


#59295 - 12/02/05 07:25 PM Re: Laminated beam and fan box...  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Thanks guys, for all the help!!

I knew I could get some "support" here. [Linked Image]



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