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Hi there,
I’m going to be pouring a residential foundation soon (Montreal,Quebec), and am curious about a number of things:
1) I haven’t been able to find anything on the placement of rebar in residential footings & foundations. Is there a general rule of thumb??
2) I’m trying to maintain as much headroom in the basement as possible.
All the drawings I’ve seen of the concrete basement slab show it sitting on top of the footing. Is it a problem to have it on the same plane as the top of the footing??
3) The foundation plan calls for a transition from 8 foot walls atop the footing for the main house to 4 foot walls atop a footing for the garage
which is on the side of the main house and slightly inset both front and back. How this is accomplished if a point of curiousity so…does anyone know of a good reference for residential concrete work(lots of detail).
Thanks
Replies
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Alex, in order:
1) many areas do not require reinforcement in footings, nevertheless it is a good idea to include rebar. If there are no particular seismic considerations or extreme point loading a double row of #4 set on chairs every three feet or so should suffice. I always overlap the rebar at joints by three feet or so and use a conduit bender to turn corners with the steel. Use wire ties to connect all chairs and joints.
2)The slab is poured slightly above the footer to allow water to weep thru the block and enter the drainage tile which should mirror the interior perimeter of the foundation. If you pour the floor at the same height as the footer there will be no place for the water to go but across your basement floor. Add a course of block- three or four hundred bucks.
3)The transition between varying heights is accomplished with lintels. This applies specifically to block walls, but is handled in a similar fashion with poured foundations. A lintel is simply an elongated concrete block with two steel rods embedded to carry loads across short spans.
As far as a research resource- try the library. (Concrete Masonry Handbook - recent addition. Published by the Portland Cement Assciation, Old Orchard Rd. Skokie, Illinois)
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am interested in the proper way to foot or
install steel pipe in the ground for supporting
a free standing carport. a cement slab will be
poured for the foundation
Thanks
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Don't forget to insulate under the interior basement slab.
*#1. footings;minimum 2-#4 bars run continuous,lap minimum 2 ft,support so they are in center of footing, make sure bars are located under wall (4" from outside edge of footer)walls:i believe in strength, vertical- 2ft o.c.,horizontal- 1ft o.c. steel is cheap.#2. yes. install waterstop in footer to seal cold joint between wall and footer pour.#3. would have to see plans
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Hi there,
I'm going to be pouring a residential foundation soon (Montreal,Quebec), and am curious about a number of things:
1) I haven't been able to find anything on the placement of rebar in residential footings & foundations. Is there a general rule of thumb??
2) I'm trying to maintain as much headroom in the basement as possible.
All the drawings I've seen of the concrete basement slab show it sitting on top of the footing. Is it a problem to have it on the same plane as the top of the footing??
3) The foundation plan calls for a transition from 8 foot walls atop the footing for the main house to 4 foot walls atop a footing for the garage
which is on the side of the main house and slightly inset both front and back. How this is accomplished if a point of curiousity so...does anyone know of a good reference for residential concrete work(lots of detail).
Thanks