Home Page link

truss span

Home| Search | About
Login Password
Register Now! Lost Password?

Architecture and Design - Building design/construction and related topics. 

Page 1 of 2       1 2 > last >> Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
truss span JA_MORAN 03-09-2008
| `--> Re: truss span Michael Bulatov...03-10-2008
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by JA_MORAN on March 9, 2008, 9:00 pm
am building a garage above wich will be a living room and a patio

span on trusses supporting hte garage roof and 2nd floor will be 24 feet

considering using laminated (stacked) 2x4's how many will I need to
safely support the load and not have any sag in center ??

JOHN

Posted by RicodJour on March 9, 2008, 10:52 pm
> am building a garage above wich will be a living room and a patio
>
> span on trusses supporting hte garage roof and 2nd floor will be 24 feet
>
> considering using laminated (stacked) 2x4's how many will I need to
> safely support the load and not have any sag in center ??

Insufficient information for a meaningful answer.

R

Posted by Michael Bulatovich on March 10, 2008, 8:48 am
RicodJour wrote:
>> am building a garage above wich will be a living room and a patio
>>
>> span on trusses supporting hte garage roof and 2nd floor will be 24
>> feet
>>
>> considering using laminated (stacked) 2x4's how many will I need to
>> safely support the load and not have any sag in center ??
>
> Insufficient information for a meaningful answer.

Isn't this sort of thing covered in the FAQ?



Posted by Ralph Hertle on March 10, 2008, 12:44 am
JOHN:

Stacked unattached [2x4]s will deflect together exactly as one single
member.

Each one is responding to the load separately. If a 1lb load results in
1" deflection, in a stacked array 10 [2x4]s under a 10lb load will also
deflect 1" total.

If, however, you have bonded the wood members together with a suitable
adhesive the strength of the greater beam is many times the strength of
each one or even the ten separate members together.

If you had a lot of available [2x4]s you could make quite efficient
beams and joists. The strength would be close to that of composite wood
beams of the same sizes and material, although TJIs would weigh less and
be more uniformly straight.

How to laminate them is a question: the type of wood, type of adhesive
and the clamping means with clamps or nails.

Call a local civil engineer or architect to get a calculation based upon
the loads that you plan, length and depth of beams. Or, contact a maker
of laminated beams to get some numbers on sizes for your application,
loads, and the type of wood they use. Check their prices to see if you
are saving money.


Ralph Hertle



JA_MORAN wrote:
> am building a garage above wich will be a living room and a patio
> span on trusses supporting hte garage roof and 2nd floor will be 24 feet
> considering using laminated (stacked) 2x4's how many will I need to
> safely support the load and not have any sag in center ??


Posted by Ralph Hertle on March 10, 2008, 12:53 am
John:

JA_MORAN wrote:
> am building a garage .....

Ask your local building department for the codes that govern the
building. With a residence above the garage you may have to put in a 1
or 2 hr rated gypsum wall board ceiling and walls in the garage. 1 hr is
the norm for the residential areas. Figure 5/8" thick GWB for a 1 hr
rated wall or ceiling assembly, taped, and with no gaps, and 2 layers of
5/8" GWB for 2 hrs.

Ralph Hertle

Page 1 of 2       1 2 > last >>
Similar ThreadsPosted
truss design April 30, 2006, 8:09 pm

Contact Us | Privacy Policy

XML SitemapXML Sitemap