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-   -   Mighty Anvil (http://www.diychatroom.com/f19/mighty-anvil-1232/)

K2eoj 10-31-2005 01:31 PM

Mighty Anvil
 
MA, I see flitch plates and beams mentioned on other forums. I know they are widly used in NJ. and was wondering if they make it a couple of hundred miles up the coast and what your opinion might be on using them. I am quite certain they are not used in the western states. Thanks you in advance. I enjoy your post even when I don't agree with them. HS

mighty anvil 11-02-2005 04:21 PM

Flitch plates became rare when plywood box beams arrived and they disappeared when LVL's arrived. I've never used a flitch plate because I consider them too inefficient for use in a major beam (compared to a light steel beam) and I've never raised a window or door head that close to a ceiling in a residence.

I don't see anything wrong with the plates if there is not a more efficient design posssible.

Generally speaking for HEM-Fir #2 lumber in the 10 and 12 inch nominal height range:
a 1/4" thick flitch plate between 2x's is usually equivalent to double 1 3/4" LVL's of the same height.
a 1/2" thick flitch plate between 2x's is equivalent to double 1 3/4" LVL's that are about 1 1/2" taller.

I don't find that impressive enough to go to the trouble to order flitch plates cut to size when LVL's are available at the lumber yard and their capacity is so easily documented (stamped) by the manufacturer .... so I would only use them if I were in a jam and couldn't find another way to do it.

K2eoj 11-02-2005 06:58 PM

[quote=mighty anvil]Flitch plates became rare when plywood box beams arrived and they disappeared when LVL's arrived.


I've never heard of a plywood box beam. Electricians have it made. One code book rules them all,... (except in seismic areas). HS.

mighty anvil 11-02-2005 08:09 PM

http://www.timber.org.au/NTEP/menu.asp?id=105

K2eoj 11-02-2005 11:40 PM

Quote:

Originally Posted by mighty anvil

Thanks, I got that one bookmarked.


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