DIYbanter - View Single Post - Cutting a new window hole in a 4" thick conrete block wall

Phil L

wrote:
Hi again,

I want to cut a hole for a new window in my house. It's got fairly
standard cavity walls, built of concrete blocks. Actually the blocks
are somewhat non-standard as they have foam insulation inside them (I
mean inside the actual blocks - not inside the wall's cavity.) The
only masonry-cutting tool I own is a 9" angle grinder. This will cut
concrete blocks no problem, but only to about 3" deep. I suppose
could hire a 300mm grinder for about £28 a day plus the cost of the
cutting disk which I'm guessing won't be at all cheap.

Rotary grinders in general make an insane amount of dust. Is there
any other tool that anyone can recommend? (I'm visualising something
like a very large jig-saw with a diamond blade...)

Thanks for any tips you can offer,

No professional would contemplate cutting a hole like this with any kind of
grinder - the entire house will be filled with dust.

It will take 45 minutes with a hammer and bolster chisel.

Cut the outside brickwork with any grinder you like.

I'm assuming you've thought about lintels and such likes?