Cutting 3" hole in stucco for soffit vents


Old 07-10-08, 10:43 AM
Thread Starter
Join Date: May 2006
Location: Vancouver, BC, Canada
Posts: 171
Received 0 Votes on 0 Posts
Cutting 3" hole in stucco for soffit vents

I just bought a 43 year old house and it doesn't have any soffit vents, which makes the attic extremely hot. The soffits are covered with stucco (like the rest of the house) and I was hoping to install 3" round vents all along the house. I would need to install about 20 of these. I have tried a standard hole cutting bit on a hammer drill and it cut through great, but of course wears the bit down after only one hole.

Can anyone recommend a bit to do this, probably a diamond carbide one I would imagine, but i want to make sure I get one that can do the whole project if possible.
Sponsored Links
Old 07-10-08, 04:04 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 25,445
Received 570 Votes on 523 Posts
You need a 3" core bit. Similar to those pictured here. They are not cheap. You will want to ensure that drilling the holes is actually going to give you ventilation, and that the soffit is not blocked off from the attic rafters along the top plate. Sometimes there are obstructions that would block the passage of air.
Old 07-10-08, 05:23 PM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 10,124
Received 34 Votes on 32 Posts
I cut many holes in stucco using a very simple method.

Using a round object the size of the hole wanted draw circle with a marker.
Take a 3/16" or so masonry bit and drill a series of small holes around the perimeter of the mark and a few in the center then chisel out the center.
A hole saw will then drill through the wood.

For as many as I do the few minutes each hole takes makes it not worth spending the money on a core bit.
I can usually use a cordless drill on high speed for the drilling.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: