GArage Addition, how to tie foundations together...
GArage Addition, how to tie foundations together...
(OP)
Good Morning,
I'm a civil P.E. in NY. I am planning a garage addition and I was running through some numbers and I am a bit stumped on how to tie the garage addition foundation to the existing addition?
Existing structure is a two story colonial, full basement (8ft deep).
I am looking to add a two story garage addition to the side of my existing house.
I am looking for the proper method to tie them together?
I plan to use CMU's, 4ft below grade, 2ft wide, 8" deep footer (a bit overkill, but it is my own home). Since the two footers will be offset by about 4ft, should I pin to existing CMU by grouting void spaces?
I'm a civil P.E. in NY. I am planning a garage addition and I was running through some numbers and I am a bit stumped on how to tie the garage addition foundation to the existing addition?
Existing structure is a two story colonial, full basement (8ft deep).
I am looking to add a two story garage addition to the side of my existing house.
I am looking for the proper method to tie them together?
I plan to use CMU's, 4ft below grade, 2ft wide, 8" deep footer (a bit overkill, but it is my own home). Since the two footers will be offset by about 4ft, should I pin to existing CMU by grouting void spaces?





RE: GArage Addition, how to tie foundations together...
RE: GArage Addition, how to tie foundations together...
RE: GArage Addition, how to tie foundations together...
Can you drill or bore into the side of the existing slab?
RE: GArage Addition, how to tie foundations together...
RE: GArage Addition, how to tie foundations together...
10 Feb 14 16:47
How does he prevent a trap for water accumulation in that lowest-to-highest? Even if it were not flowing down the yard, snow, rain, ice would build up if not drained away very carefully.
RE: GArage Addition, how to tie foundations together...
1) Bind the new and old foundations together.
2) Isolate the new foundation from the old, and allow for differential movement in your detailing.
Both are valid, and have several ways of going about doing them.
Most commonly I will ask the client which they want, explaining th risks and potential benefits to each, and pursue a solution under their direction.
RE: GArage Addition, how to tie foundations together...
May I ask why you are using block and not a poured wall especially a wall formed with ICF's.
RE: GArage Addition, how to tie foundations together...
IT is a CMU wall. I will put op some renderings of the set up later today.
Thanks for all of the responses thus far.
RE: GArage Addition, how to tie foundations together...
If it is not grouted, drill horizontally in two cells minimum (16"), grout both solid, and insert horizontal rebar into the newly grouted cells, stubbing the bars out at least 24" to receive the new horizontal steel.
Mike McCann
MMC Engineering
RE: GArage Addition, how to tie foundations together...
RE: GArage Addition, how to tie foundations together...
I think that's what I said... Or at least what I intended to say.
Mike McCann
MMC Engineering
RE: GArage Addition, how to tie foundations together...
Mike,
You say:
Makes perfect sense if you have access to the top of the wall. But in this case there's a house sitting on top of the wall, which will then require breaking into the appropriate cell "columns" somewhere near the top of the wall in order to grout the cells. This also creates additional difficulty when constructing the new CMU walls to accommodate the projecting bars.
I would opt for CELinOttawa's suggestion
Which then leads to additional considerations when framing the 2-story garage against the existing house.
Ralph
Structures Consulting
Northeast USA