FOUNDATION HOLE HELP (Possible Job)

[nicks67camaro]

I need to cut a hole in my foundation to run a flu. The OD needs to be 9.5 inches. Can I rent a concreate hole saw this big? Can I hire someone to cut this? Any one know the cost involed.

Thanks for any input.

Nick

[Jim Nilsen]

You should be able to get one that does if you find the right place, but You can also get a hammer drill and a 3/4 to 1 in. bit and drill a series of holes around in a circle and just knock it out with a hammer. it will probably take just about as much time either way you do it and the mess created keeping the hole saw cool may actually make the hammer drill an easier way. I would think it would take about 5 minutes per hole in a standard foundation and probably about 12 to 16 holes to do the job and then some cleanup with a chisel bit around the rough edges.

I would suggest renting a splined bit hammer drill and stay away from the SPS style to make sure you get a drill heavy duty enough to do the job. should be able to rent the hammer drill for about $50 for 4 hrs or maybe the whole day.
If you get to the rental place before they close today you can probably rent it for 4 hrs and get to have it all weekend as long as you return it on monday morning.

Make sure you an extra bit just in case you get it stuck on some rebar and several sizes if chisels.

If you do find a core bit and drill big enough it would be great but either way you do it will work.

Have fun

[nicks67camaro]

Thanks Jim, That was the direction I was going in. I found a place on line that has 2 styles of core drills, Hand held and stationary. I think I will go the core drill route to try and keep the whole as clean as possible. Thanks for the response.

[shmoov69]

The most cost effictive way would be a hammer drill with a bunch of holes in a circle. Hammer it out with a sledge and use a grinder to cut the rebar and clean up the hole. Then use some good hi temp caulking to seal it up.
Or call a coring and cutting company to do it nice and clean!