im getting ready to build my 2x12 30' support beams, what type of glue should I use? ???
Quote from: astidham on June 12, 2010, 11:29:52 PM
im getting ready to build my 2x12 30' support beams, what type of glue should I use? ???
I know that you should not use something like liquid nails- too thick to allow wood to compress properly.
I was going to brush on some standard wood glue (elmers) which I think would work fine, but decided against because I was building them piece by piece on the piers and it's a tight squeeze to fit that last board in. Since all my joints landed on a pier I figured it didn't matter.
Something like Gorilla glue would probably work well also, but can be messy.
Thank You dug
The glue adds zero strength, but it will make the assembly stiffer. Subfloor glue has been used in millions of houses for built up girders. On almost any glue available to you and with the materials and methods available in the field, structural glueing is out of the question. Most of these glues will creep to failure if called upon to support a real load. So we can make things stiffer and certainly a bit better but that's about it.
I like the many "PL" adhesives available at HD. If the structure is to see some weather, I use PL's "Roof and Flashing Sealant" ... not a structural glue ... I depend on nails or screws for bonding strength, but it is sun and rain resistant ... and will keep water out of the joints (this is what I'm after). Takes a while to cure fully ... plan on a week or better ... after that is paintable with water based paints. A little pricey, and only available in the smaller caulk gun tubes.
For assemblies that will never see weather, I use PL's poly glue (PL 400 ??) ... available in the large caulk gun tube.
Like dug, I placed all my beam spices over posts so I never bothered with glue. No bounce I can feel.