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PostPosted: Mon Sep 11, 2017 12:07 pm 
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Imagine a basement wall made in concrete, with a suspended concrete slab on top (roof of basement).

Now imagine you need to install a steel to provide additional support to the basement roof. The steel will bear into the wall, up against the soffit.

Now imagine trying to cut the hole for the steel to go into.

It would be a nice square hole, exactly 100mm deep to give a 100mm bearing of the steel onto the wall, so as not to penetrate through the other side of the basement wall.

Me, up a ladder, attacking a reinforced concrete wall with a diamond blade grinder, realising I won't be able to get the grinder into the wall where it meets the soffit, let alone get the hole square. Not to mention: grinder blades are circular, so it's not easy to have nice consistent depth.

(Note: I haven't actually tried the above...)

I have watched builders do this to brick walls, but brick is easy because you can use a breaker, then bolster / chisels etc. to make a nice hole.

So, what kind of clever tools / techniques can I use to make this job possible?

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PostPosted: Mon Sep 11, 2017 12:18 pm 
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I don't really understand exactly what you're doing as far as the steel goes, but as far as the recess goes you could drill a matrix of holes 100mm deep in a 100 mm square with an SDS drill, and then chop the hole out either with the drill fitted with a chisel or by hand.

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PostPosted: Mon Sep 11, 2017 4:32 pm 
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stitch drill it.

Dodgy off a ladder, best on bandstands or a tower.

If you use a drill without a clutch and are up a ladder its a recipe for flying lessons :wink:

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PostPosted: Mon Sep 11, 2017 5:28 pm 
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Chain drill it, and knock it out with a chisel, if theres rebar, tha'll be a bit awkward, might need to saw off the bar if you cant get a grinder in there...

Youll want some wiggle room to get the steel in there mind...

Why isn't the number 11 pronounced onety one?

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