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Country Discussion Topics
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Wood I-beams
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Bandit    Posted 11-18-2003 at 11:47:08       [Reply]  [No Email]
Hey,
Does anyone know any sites that have the specs on the glulam wood I-beams? spanning lengths and loads and stuff. I've been trying to find that info but with out much luck.

Thanks a lot.


Slo    Posted 11-19-2003 at 16:59:13       [Reply]  [No Email]
Check with the US Forest Products Laboratory in Madison WI. They will have the info, or know where to get it.


Redneck    Posted 11-19-2003 at 02:03:48       [Reply]  [No Email]
Don't know the specs but some are built locally here.I know a man that backfilled too soon on green concrete and had the entire length of one wall of his basement cave in.The house was comeplete weightwise.They had used the beams you speak of.The house dropped less than a 1/2 inch.They shored it up,relaid the entire wall with no ill effects.It would have never held up with normal beams.House is close to 10 years old and is sound as a dollar.


LesWV    Posted 11-18-2003 at 21:43:38       [Reply]  [Send Email]
Bandit
APA Standards pretty much sets the standards on Manufactored wood I beams.
It really denpends on the Joist Depth, Flange Width, Web Thickness and Spacing is to get how long of a span can be used.

Take a beam with the following specs.

Depth 16"
Flange 3 1/2" (composite lumber)
Web 3/8 OSB

If you build using
12" centers. You can span up to 36'.
16" centers spans up to 32'.


You can get beams that are from 9 1/2 to 16" depth with different flange widths and web material. This of course will have an effect on how large of a span that can be safely use the Beams on.



Spence - Opinion Part Deu    Posted 11-18-2003 at 21:27:30       [Reply]  [No Email]
I don't trust the things right now. I know Bob Villa and others are pushing the products as wonders of the technology age but they haven't had the test of time. Villa as nothing to lose and everything to gain.

Manufacturers have a strong lobby group, and the more they distance the gap between production cost and profit the better for them. They push the "protect the forests" brainwashing for all it's worth. If they can convince the construction law makers that they have a robust product the better they have of realizing a profit. It has parallels in the prescription drug industry with MFG's trying to push a product through without testing. I don't see a problem with making a profit, but for reassurance why couldn't we make them set up a 30 year trust fund. If they're product is a robust as they say they get their saved money back, if not, it goes to the homeowners for repairs.

You may recall they made such a promise for preserve wood foundations years ago. "Wood can be made to last a lifetime" they said back then only 30 years ago. "Guaranteed 60 years or more" was the promise. Now look at the millions being spent on re-excavation for poured concrete, at least that is some of the sad cases around these parts. Poisonous copper oxide residues coming up in ground water testing.

Looking at these beams, they look pretty flimsy
to me. Frankly give me the 2X8's or 10's until I know for sure.

My deux cents


LesWV    Posted 11-19-2003 at 09:21:08       [Reply]  [Send Email]
Spence
Pound for pound. They are much stronger than solid wood.
Take a sheet of Plywood or OSB board. Cut a piece 6" X 4'. Then lay it flat between two blocks. When you press on the center of it. You will see that it is very weak and flexable. Next stand the piece on edge and see how far you can get it to flex. It wont. Then if you dado a groove down the center of two pieces of say a 2" X 2" X 4' that the piece of OSB will fit snuglly into and glue them together. You can drive a car over the I beam when it is standing on edge and never faze it.

All of the builders around here love them. For it gives them a much flexability as what they can do.
When ask about concerns. The only one that came up is flooding. Should the I beams be built from OSB they fear that if the beams are covered by water for an extended period of time. That the OSB may swell and be damaged.


walt    Posted 11-18-2003 at 14:41:46       [Reply]  [No Email]
Years ago when these first came out, the manufacturers were charging for engineering info. Then because of old time carpenters, plumbers, electricians, etc, just cutting through them like it was dimension lumber, the companies started getting lots of consumer complaints. Go to the supplier you plan on buying them from, they can put you in touch with the company's engineers to help you with loads, specs, etc.


jf    Posted 11-18-2003 at 13:14:08       [Reply]  [Send Email]
I do not have a website for this info but I do have advice. USE THEM. we built a new house in 2001 with the use of I beams. The result was an extremely strong house with no creaks in the floors. I have a section from june 2001 that has set outside in all weather since and shows no signs of falling apart at all!


Fawteen    Posted 11-18-2003 at 11:51:54       [Reply]  [No Email]
Try a Google search on "engineered lumber" or "engineered wood I-beams". Georgia Pacific has quite a lot of data in PDF files, you'll need Acrobat Reader to open them. It's a free download if you don't already have it.



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