building a long valance - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 27 Old 11-05-2015, 06:15 AM
where's my table saw?
 
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in my experience ....

When you glue 2 pieces of plywood together it sometimes will warp. When you glue 3 pieces together it's less likely because the stresses are equalized on the center section.

To make a 16 ft length, you start with 2 -8 ft sections laying flat on the ground. Then lay an 8 ft piece centered on the lap and 2 - 4 ft sections on either end. Next lay down the last 2 - 8 ft pieces gluing them all together, applying the glue with a wide brush or roller.

The final laminate can be trimmed with a circular saw at the desired width. Here's a multipiece lamination I made for a long handrail:
http://www.woodworkingtalk.com/membe...il-5-16th-oak/

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #22 of 27 Old 11-05-2015, 03:13 PM Thread Starter
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Thanks for explaining how that's done. I don't have a bunch of clamps, instead relying on screws to hold things together, so 3 layers might get too complicated. Also, if I use a single sheet of that primed-on-one-side plywood, will glue adhere to the primed side ? Since the thing will be braced by that horizontal piece, wouldn't warpage of a 2-layer beam be a non-issue ?
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post #23 of 27 Old 11-05-2015, 06:33 PM Thread Starter
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Actually, I'm thinking some kind of hefty steel bracket, about halfway down the length, cantilevered from a stud on the wall parallel to the beam. That'd solve the support problem and hopefully the warpage problem too.
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post #24 of 27 Old 11-05-2015, 06:36 PM
where's my table saw?
 
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OK, here's how this works ....

Guy asks a question, other guy say do X based on experience. First guy says why not do Y ? Other guy says fine, do Y. First guys has no clamps. Other guys says... what about weights, cement blocks, tires, books,.... how were you gonna make the thing in the first place and maybe that's why it's taking 2 years...?

If I thought 6 layers was best, I would have suggested 6 layers. You don't like my advice? fine, do Y. I'm out. and no charge for my free advice, you get what you pay for....

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #25 of 27 Old 11-05-2015, 06:38 PM Thread Starter
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For the multi-layer beam, am I right in thinking that, for the layer where there's an 8ft piece in middle, that the short pieces at either end could probably be left out ? (To save weight).
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post #26 of 27 Old 11-05-2015, 06:44 PM Thread Starter
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Quote:
Originally Posted by woodnthings View Post
You don't like my advice?
I DO like your advice, actually. I like to try to understand stuff, and I do that by asking questions. I think they were reasonable questions (e.g. will glue stick to primed face of plywood ?). Sorry if that offends you.
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post #27 of 27 Old 11-06-2015, 01:06 AM Thread Starter
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Would Gorilla Glue or Titebond be better ? Sounds like GG is polyurethane, so maybe less moisture issues and warpage potential ?
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