Hello, I have some copper pipe and electrical conduit I want to bring outside from my crawl space. Previous contractors brought them thru the crawlspace vents. The screens across the vents are now all chewed up. Searching online I see some pipes are brought thru holes drilled in the foundation wall. What are the rules of thumb on drilling holes in your foundation? If I have two lines should I drill one big hole or two smaller ones. Are there requirements for spacing or minimum distances from edges or other holes? any help is greatly appreciated.
thanks
Brian
Replies
When installing pipe or conduit through a masonry wall:
a. It must pass through a sleeve. This is typically a galvanized pipe - NOT tubing - min 1/2" larger in diameter.
b. Depending on pipe size, they make sealing gaskets for inside the sleeve. Otherwise use expanding foam. Apply expanding foam as close to the wet side of the wall as possible, if applicable.
c. Sleeve should be encased in hydraulic cement to bond it to the masonry wall.
d. Limit it to 1 pipe per sleeve.
e. Generally 6" separation for sleeves 2" or less.
Frankie
thanks for the info Frankie. very helpful
what about minimum distances from edges? same 6" rule apply?
thanks again