Richard Downing wrote:
The Natural Philosopher wrote:
wrote:
Richard Downing wrote:
stevesmith wrote:
I need to join some tanalised planks of wood edeways. The wood is 45mm
wide.

Do I have to plane the edges down to untreated wood and then water
proof glue them together, or can I glue tanalised without planing ???

Is there any other methods to join them together ??

The joined wood is not going to carry much stress.
If the wood faces are reasonably flat and you can only see, say, 1mm of
light between them, then a Polyurethane glue will work well. I would
NOT sand or plane the sides to be jointed as a rough surface will bond
better than a smooth one - the important thing is that the mating sides
should be, well, mating. Polyurethane glue foams to fill minor surface
imperfections and is very strong - as it's moisture cured it doesn't
mind the damp.

E.G.
http://www.screwfix.com/app/sfd/cat/...98610&id=30590


R.
Thats what the cartridge said too, but it wasnt my experience. When wet
it got a lot weaker, and pulled apart fairly easily.

Yup./ It doesn't hold under tension that well..got lots of warped failed
glued joints in my oak porch..

NT



Interesting. I've used it for some time without problems. But I'll
examine some now you've both pointed this out.

Sorry for the bad advice, stevesmith.

R.
My view is that in exterior situations, glue in any shape or form is
pretty inappropriate..it hasn't got the tensile strength, and wood will
split itself, let alone glue, when you get wide humidity variations.

The only answer is some kidn if screwed or bolted solution.