|
Posted by MiamiCuse on February 16, 2008, 9:45 pm
>
>>
>>>
>>>>
>>>>>
>>>>>> How strong are laminated beams? Better than solid wood?
>>>>>>
>>>>>> I have a 32' long laminated beam 24" deep about 12" wide sitting on
>>>>>> 4x6 steel columns on each end.
>>>>>>
>>>>>> After 35 years it "looks" ok and is holding up the exposed roof
>>>>>> structure.
>>>>>>
>>>>>> I am wondering if it would be ok to drill three holes through it to
>>>>>> hang three heavy ceiling fans. Not sure I want to do that anyways
>>>>>> but
>>>>>> wondering if that is an option.
>>>>>>
>>>>>> MC
>>>>>
>>>>> Don't drill the beam.
>>>>> Screw a backer plate on the bottom side of the beam to carry the
>>>>> weight of the fan.
>>>>> Screw a piece of harmonizing wood vertically on the least visible side
>>>>> of the beam with a channel routed in the inside of the piece to
>>>>> conceal the conduit for the fan wire.
>>>>> I'm presuming you are talking about drilling a hole vertically through
>>>>> the beam, right?
>>>>> Man, that'd take some kinda drill bit.
>>>>> The weight of a couple ceiling fans is inconsequential to the load the
>>>>> beam is already carrying.
>>>>>
>>>>
>>>> Don:
>>>>
>>>> I don't want to drill the beam, as a matter of fact, I am sure if I try
>>>> to drill it the hole will not be at 90 degrees when it's done it will
>>>> be like 86 degrees and the rod will be slanted. The beam size I
>>>> mentioned in the initial post is incorrect, NOT 12x24, but 6.75" W x
>>>> 16" DEEP.
>>>>
>>>> I am confused by the backer plate. How is the backer plate going to be
>>>> suspended? By the conduit that is off to one side of the beam? Will
>>>> the backer plate also be off to one side? I cannot visualize what you
>>>> mean.
>>>>
>>>> Thanks,
>>>>
>>>
>>> I did a quick calculation of a 6.75 X 16 glu lam beam with 2000 psi
>>> allowable stress for loading. The section modulus of this beam is 288
>>> in^3. The span is 23 ft. This allows for 48 kip-ft moment worst case.
>>> the load per foot for a simple beam would be 726 lb/ft loading. If the
>>> tributary width/spacing of the beam say 10 feet this allows 73 lb/ft^2
>>> loading. Roof loads by code is 20 lb/ft^2 ( no snow ). The beams
>>> appears to be quite strong and three fans at 20 lb each or 60 lbs is
>>> really nothing. I would contact the manufacturer to find out what the
>>> suggested installation will be for your condition and attach it to the
>>> beam accordingly.
>>>
>>> Good luck...
>>>
>>> CID...
>>>
>> Chuck: The span is not 23 it's 32ft. Does it change the picture?
>> Thanks.
>
> This allows for 48 kip-ft moment worst case.
> the load per foot for a simple beam would be 375 lb/ft loading. If the
> tributary width/spacing of the beam say 10 feet this allows 37.5 lb/ft^2
> loading. Roof loads by code is 20 lb/ft^2 ( no snow ). The beams appears
> to be strong and three fans at 20 lb each or 60 lbs is really
> nothing. I would contact the manufacturer to find out what the suggested
> installation will be for your condition and attach it to the beam
> accordingly. The beams appears
> to be quite strong and three fans at 20 lb each or 60 lbs is really
> nothing. I would contact the manufacturer to find out what the suggested
> installation will be for your condition and attach it to the beam
> accordingly.
>
> CID...
>
>
Thanks Chuck much appreciated.
MC
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap