Chop or Core Wall

mstrlucky74

Senior Member
If you had (4) 4" conduits going through a masonry bock wall(existing) would you chop out a "window" or core individual holes. I believe it's usually an opening made with hammer drill. Thanks.
 

ActionDave

Moderator
Staff member
Are the blocks hollow or solid cored?

If it's hollow just bash though with a single jack sledge hammer.
 

Coppersmith

Senior Member
With 4-4" conduits going through the wall, that is the equivalent of taking out two full blocks. You might not have any issue if you spread them out, but if they are close together, the blocks above may lose stability. In that case, a metal lintel (basically angle iron) should probably be installed above the removed sections. I would consult a block mason. Coring is probably more stable since you are leaving more material in place.
 

JFletcher

Senior Member
If you had (4) 4" conduits going through a masonry bock wall(existing) would you chop out a "window" or core individual holes. I believe it's usually an opening made with hammer drill. Thanks.
I'd put 2 holes in one block and 2 in another. Avg block is 8"H x 16"L, you're not getting 4 4" conduits thru one block. I'd just as soon not have to use large fire stop bricks to seal the opening or pay a mason to fix the hole.
 

infinity

Moderator
Staff member
As Dave mentioned if it's solid filled then core drill, if the blocks ares still hollow then chop the hole. Solid filled walls also may have rebar in them which is easier to core drill through.
 

Little Bill

Moderator
Staff member
Not most always, if the block is below grade or being used to hold side pressure then they are filled. Probably other reasons as well.
 

jumper

Senior Member
It gets really fun when you start punching/drilling through and a 2' pile of vermiculite insulation piles up on the floor.:rant:
 

qcroanoke

Sometimes I don't know if I'm the boxer or the bag
It gets really fun when you start punching/drilling through and a 2' pile of vermiculite insulation piles up on the floor.:rant:
Yeah! Always fun. I always knew to look for that before knocking a hole.
Do they still use it? I seem to recall it was linked to cancer?
 

jumper

Senior Member
Yeah! Always fun. I always knew to look for that before knocking a hole.
Do they still use it? I seem to recall it was linked to cancer?
The old stuff, pre 1990 or so, I think had some asbestos IIRC, the new stuff is probably safer.
 

KWH

Senior Member
Is it possible to get on top of wall and look down or does it go all the way to the deck.
 
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