I'd appreciate advice on the best way to construct a 12-foot wood beam
that is strong, sag-resistant and easy to assemble and disassemble.
The plan is to construct the beam with two rows of 2x3 spruce or
hemlock lengths with their sides bolted together to make up a beam
that is 2-1/2 inches in the vertical dimension and 3" in the
The total load on the beam would be about 30lbs. and would be
distributed evenly along the full length of the beam.
I'm particularly interested in knowing how many lengths should be in
each row, how long each length should be and where they should be
positioned in relation to each other. No length can be longer than 8
feet. Any other information that would help me construct a strong and
sag-resistant assemble/disassemble beam of 2x3 lengths would be
welcome as well.
Thanks for your input, Dave.
I need to make up a beam because the actual length is 12 feet, 3
inches. I indicated a length of just 12 feet in an effort to keep
responses focussed on the main issue -- the number of lengths and
their placement relative to each other.
On Tue, 12 Feb 2013 12:06:22 -0500, "David L. Martel"
Please do not top post. This is a bottom post group. Thanks!
re: " I indicated a length of just 12 feet in an effort to keep
responses focussed on the main issue.."
Problem is, telling us it's 12 feet gets us focused on wondering why
someone would "make a beam" that is a standard length. That makes
*that* the main issue for us.
Since we now know why you need to make a beam (it's a non-standard
length) it seems like dadiOH's concept ought to work, but you are
going to have waste:
2 lengths at 6' 1.5" = 12' 3"
1 length at 6' plus 2 lengths at 3' 1.5" = 12' 3"
I did something similar in SWMBO's garden but I think mine was longer
than 12' 3". I'll have to check tonight. I screwed the heck out of it
using a couple of hundred screws coming at it from both sides. This
spring I'm going to flip it over 'cuz even with all those screws,
after 4 years there's a noticible sag. There's no weight on it, it's
supported at each end, about 6" from the ends.
On Tue, 12 Feb 2013 13:43:49 -0800 (PST), DerbyDad03
Making such a small diameter wood "beam" without it sagging probably
takes more engineering than it might seem to some.
That why beam height increases with length.
The best bet is to look for the technical specs somewhere.
Different woods sag differently.
Then you don't get disappointed.
Glued plywood construction probably is the way to go for least sag.
Just my 2 cents.
But that would allow perhaps someone to suggest a good alternative to
accomplish the task.
Its always a good idea to state what you are trying to accomplish
because quite often someone will say "did you consider x"
Made out of what? Design me this softwood 'beam, 3" wide, 2 1/2"
high, with flitch plate- 12' 3" long.
Now you're down to essentially a couple 2x2's with a fitch plate made
of . . . .?
I can't see it.
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