I'm installing an exhaust fan in a thirty year old one storey addition
that's built of cinderblocks with stucco on the ouside. I'm looking
for an alternative to making a vent hole in the roof and I may have
In the following pictures you are looking at the crawl space under the
roof where the roof meets the old wall of the house. In the very
corner, there is a "wedge" where there are no cinderblocks and I am
wondering what kind of material that is. Is that something that I
could drill through to make a 4" opening? (It's in a place that I
can't reach by hand but would be able to fish the vent through.)
Many thanks in advance!
Looks like a brick, maybe a fireplace brick, with a bunch of mortar
shoved in around it.
You say you can't reach it by hand so how are you going to get a drill
into the area? And if it's mortar, I doubt you are going to want to
try and drill a 4" hole in it.
Go through the block.
Determine the location of the vent from either the inside or outside
of the wall, depending on which is more critical regarding the
Mark the center of your 4" hole.
Chuck a sharpened length of a wire hanger, long enough to go all the
way through the block, into your drill.
Drill all the way through the block (from one side) with the hanger.
Start slow and push the drill as straight as possible to avoid bending
Now you've a small hole on each side to help you determine the exact
location to start chipping away until you have a opening larger enough
for the vent.
Insert your pipe and mortar around it to secure it in place.
I believe it is pieces of concrete blocks and mortar, not a good candidate
for getting a 4" hole through without considerable effort and likely
surrounding damage to the wall and stucco. If the block cavities are not
filled with mortar or concrete, that seems a good alternative.
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