Any guidelines as far as how big, how many, or where the holes can be made in wall ?

chrishallowell

Is there any guidelines as far as how big, how many, or where the holes can be made in a cinder block foundation wall? I have looked everywhere online for guidelines. I know there are all kinds of "rules" for holes in joists and studs. What about holes in cinder block foundation wall?

I need to make two 6" holes for HVAC in the topmost row of blocks, about 2 feet apart. House is 2 stories.

Ron6519

I don't see any issue with that.
Ron

Gary in WA

As you don’t mention the use:

“Vent terminations installed per the manufacturer’s listing. (M1804.2.1)
�� Venting systems terminate not less than 4’ below or 4’ horizontally from, and not less than 1’ above a door, an operable window or a gravity air inlet into a building, nor less than 3’ above any forced air intake within 10’, nor within 12” of grade. (M1804.2.6 & G2427.8 )
�� Vent terminal not mounted directly above or within 3’ horizontally of a gas meter or oil tank. (M1804.2.6)
�� Vent terminal no closer than 3’ to an interior corner formed by (2) perpendicular walls. (M1804.2.6)
�� Power exhaust terminals not located within 10’ of property line and adjacent buildings. (M1804.2.6)” From: http://www.mybuildingpermit.com/Insp...0checklist.pdf

Gary

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chrishallowell

Thanks guys for your response!

Here's what I want to do:
I need to make two 6" holes in the cinder block foundation so I can run HVAC to a new mudroom built in an existing garage. I was just concerned about the two holes weakening the foundation and was wondering if there were any guidelines for this.