Render over brick and wood on interior wall

[ukima]

I removed about 1 square metre of blown plaster from an inside wall. There were no damp problems, the plaster was just loose after removing wallpaper.

Untitled

• ukima
• 30 May 2014
• 1

After reading lots on this site, I think I should render this with a cement/sand mixture. Then put a top coat on. It will then have backing paper before being painted.

But there is a plank of wood under the upvc window supporting it on the bricks.

Can I simply render over both the wood and the brick?

My house is about 1920, solid walls and the previous plaster had horse-hair in it.

Would love some advice about how to proceed.

Thanks

 

[roughcaster]

Cut away any loose plaster from around the edges of the patch, then give the area a good brush down to remove any dust etc. Cut a piece of polythene, and cover the plank of wood with it,,, tack it on with small nails. Once you've done that, cover the polythene with some eml (wire mesh). Let the wire mesh overlap the polythene onto the brickwork. Again, fix the mesh with nails. You're now ready to scratchcoat the area. Mix up a batch of sand and cement, 4 to 1, (4 of sand/ 1 of cement), with plasticiser/waterproofer in. Give the area a good damp down/pva, the edges too, then scratchcoat the whole area to about half to 2/3 of the thickness. Let it set, then mix up the top coat of render,, 5-1-1 (5 plastering sand, 1 cement, 1 of lime). Put on the top coat render, bring it out flush, let it set, then put on your finishing plaster, ( multi finish).

The polythene covering the wooden strip, stops the old, dry timber from swelling up and cracking the new render/plaster. The wire mesh is for giving the render/plaster a key/grip.