Wood For External Use.

[annieigma]

Hi,
one for the builder i think, or His assistant. I have finally completed the tiled roof, done the under cloaking, all looks good, and we had loads of torrential rain and no leaks (can see the underneath of the sarking as no plasterboard ceiling yet) so, need to in the end section in with timber sheeting of some sort. its one metre going down to zero over a distance of three mtrs. ~We have plenty of fixing points, and will be coating finished article with sandtex rough coating,
( the stuff you put on with a trowel or roller, finish like artex)as the rest of the house has this. what timber will be waterproof and substantial please?? any suggestions about sealing the edges etc?
Regards,
Annie.

[The Builder]

I think you mat be confusing a couple of things here, Annie.

If you're finishing the gable with timber, then you won't need Sandtex, which is a masonry paint........... unless, they've come out with a timber treatment that I haven't heard about.

The "roll-on" finish you mention (similar to Artex) ........... maybe "Polytex". They are for internal use only. There is a system of paint-spraying for use outside. That may be what your house has.

Are you sure you don't have a traditional "roughcast" finish on the house? That's simply sand & cement render finished with a rough, spiky cast finish.

What's on the existing wall below your new roof? Is it also the Artexy finish ?

[annieigma]

Hi The builder,
Thanks for the reply.

the existing finish is coloured textured stuff, we bought a tub a few years ago, and it comes out of the tub like ready mixed cement, and we used a paint roller to apply it to a cement/brick wall, so has a raised pattern, we saw some environment friendly timber framed housed being built a couple of years ago, and the plasterer/renderer finished the timber by applying some sort of coloured render with a trowel, then something like a large paint roller. this was onto wooden external board, and when finished it looked like a normal rendered coloured house.

[The Builder]

That's a new one on me, Annie. Normally, applying any kind of render coat directly onto timber or plywood should be avoided for all kinds of technical reasons.

I use timber frame all the time. The external structural plywood is covered with a breathable membrane (same as under the tiles), then wire mesh and finally, sand & cement render. I incorporate a "draining cavity" between the ply and the render as well, but that's not always essential.

I've tried Googling for the product you mentioned, but can't find anything. What did you use? Can you remember the brand name?

[Dodger666]

I have used a similar product that annie mentions on the side of my garage after a gate in the entry was removed and left a wide gap down the rendered and Tyrolean finished brickwork. After rendering the gap I finished it off with Carr's "Heavy Texture Fintry Stone" using a trowel and paint roller. It matches the existing surface beautifully. When dry I painted it. I don't know if this stuff would stick to wood though.

I have no idea where it comes from, a friend gave me a half used 5 gallon tin to use up before it went off.