Which tools do I need?


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Old 03-28-08, 12:41 PM
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Which tools do I need?

Hey there, I need to open a 4 inch hole on my wall which is comprised of concrete bricks, not a perfect circle, just an opening; which tool is the quickest and cheapest to use?
 

Last edited by rockprowler; 03-28-08 at 01:16 PM.
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Old 03-28-08, 01:40 PM
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Hello, and welcome to the DIY Forums!

Can you tell me, is your wall concrete block, or is it brick?

What do you want to have this hole for, a vent?
 
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Old 03-28-08, 01:50 PM
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I'd use an impact drill with 3/4" masonry bit, which is slightly longer than your bricks are thick (8"?). Bore a ring of closely spaced holes, tap out the waste with hammer, or, if blocks were concrete filled, proceed with chisel attachment and the drill set to "hammer" action only. You may hit rebar in there. Finally cut that out with hacksaw.
 
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Old 03-28-08, 02:14 PM
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Which tools do I need?

rockprowler -

Before you do anything, claify what the construction of the wall is!!! You can be making a mistake if you don't desribe the wall correctly.

There are concrete brick (usually 3 5/8" thick, 2 1/4" high and 7 5/8" long).

There are concrete block (usually 15 5/8" long and either 4", 6", 8", 10", 12", 14", or 16" thick). They may be filled with grout, but are usually hollow.

There are clay brick (usually 3 5/8" thick and 7 5/8" or 9 5/8" long). There are also structural clay brick that may be 5 5/8" thick.

If you have brick, you usually have some soret of vertical member for laterial support (like a wood 2x4 or 2x6 or a steel stud).
 
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Old 03-28-08, 03:41 PM
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This is really one of those "Men are from Mars, Women are from Venus" questions, isn't it? Kobuchi tells you how to do it...Dick knows there's about a dozen choices, and which one makes a difference...I want to know what the hole is for?!!

Why would you want a hole four inches if it doesn't have to be a circle? A speaker?, A vent? A cable big enough to power Chicago?
 
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Old 03-28-08, 07:45 PM
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Which tools do I need?

He just wants a hole that does not have to be a perfect circle, but I imagine it could be.

If it is a brick (3 5/8" thick) over wood frame, the same method would apply whether it is clay or concrete.

Many DIY people refer to a concrete block as a concrete brick. If it is a concrete block foundation (8",10",12",14" or 16" thick), then different tools and procedures would normally apply.

Assuming it is for a vent, then trying to find an alternate location can make a huge difference in what to do and what to use.

The poster just wanted a hole and wanted to know how to get a hole that did not have to be perfect, since he is willing to caulk/grout, point up or has a cover plate to hide the edges. - It will probably be a combination of drill(size unknown), chisel and hammer, but it could mean hiring someone/renting a drill for a core drill job through solid masonry. - There is a difference depending on the material.

A photo would be the most help.
 
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Old 03-28-08, 08:10 PM
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Thanks, Dick. You should post some of this information in a "sticky" I'm sure it would be helpful to many.

I enjoyed the post on "pumice", although it was so far over my head I needed a ladder

Always lots to learn!
 
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Old 03-29-08, 12:45 AM
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Which tools do I need?

Friends the wall is made from hollow, 3 core concrete blocks, about 8" long; reason for wanting to cut a 4" hole is that I want to fit a drainage pipe thru the wall, it's a small laundry room.
 
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Old 03-29-08, 07:53 AM
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Originally Posted by rockprowler
Hey there, I need to open a 4 inch hole on my wall which is comprised of concrete bricks, not a perfect circle, just an opening; which tool is the quickest and cheapest to use?
Friends the wall is made from hollow, 3 core concrete blocks, about 8" long; reason for wanting to cut a 4" hole is that I want to fit a drainage pipe thru the wall, it's a small laundry room.
 
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Old 03-29-08, 10:37 AM
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If this is concrete block, and you know there is no rebar in there, rent a carbide tipped hole saw:

 
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Old 03-29-08, 07:51 PM
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Thank you, I will try it.
 
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Old 03-30-08, 06:00 PM
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Erm, you will want some play and slope for the drain pipe - definitely make a bigger hole than the pipe diameter.
 
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Old 03-30-08, 10:22 PM
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Yes I will make sure of that, Thanks to all!!!
 
 

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