Our bungalow had an extension built onto the lounge about 30 years ago. It's cavity wall construction, brick outer leaf, breeze block internal. A crack runs down the plasterwork where the original wall joins the extension. It's only hairline, I can't get my finger nail into it, and it doesn't seem to have got worse in the last couple of years, but does show through the wallpaper.
I wouldn't normally bother but since we're decorating I would like to sort it out. I've chopped some plaster off and can see that the new wall hasn't been bonded into the original one very well - not much better than butt jointing. I bet they didn't put reinforcing rods into the foundations either.
What's the best way to stabilise the walls? I've thought about cementing helical reinforcing rods across the joint. If I do it this way, how many rods should I use up an 8ft wall - the block couses are 9ins high? How far into the 4in cement joints would I need to cut? Would 1in be deep enough?
How would you do it?
I wouldn't normally bother but since we're decorating I would like to sort it out. I've chopped some plaster off and can see that the new wall hasn't been bonded into the original one very well - not much better than butt jointing. I bet they didn't put reinforcing rods into the foundations either.
What's the best way to stabilise the walls? I've thought about cementing helical reinforcing rods across the joint. If I do it this way, how many rods should I use up an 8ft wall - the block couses are 9ins high? How far into the 4in cement joints would I need to cut? Would 1in be deep enough?
How would you do it?