question with garage building

[rodrigger]

Hello Guys , would like to build a 16' wide x 26' long garage. I have attached a picture on my driveway where the garage is intended to be built. As you can see the existing retaining wall was built when I extended my house a few years back, now I want to make use of this wall and use as a footing for the garage. The wall is 2 feet high. The overall width is just shy of 16', the thickness of the wall is 6". The left side wall is long so no problem there ,its the right side wall that is 14' long and I am thinking of attaching a concrete blocks (12' long) to extend it to make it 26' long. Question is can or am I allowed to do this and if so how do I do this. Do I cut into the pad (6" wide and 12' long) and cement in the blocks ? or do I make a complete concrete form 6" wide and 12' long. Framing will be 2 x4 studs.

Hope my question is clear as mud???

 

[joey1320]

Highly recommend you contact an engineer or at least your city/county building department.

 

[rodrigger]

yes will be talking to city engineer for sure.....just wanted to know if anyone around here has done something similar....cheers

 

[readhead]

Do you have to submit plans to the local council? If so can you prove that the existing work is adequate to support the new work.

 

[Don1357]

If the pad is good enough you drill holes and epoxy rebar every 3~4 feet so when you lay your cinder blocks and fill the holes with concrete it is properly attached. You will also need to drill and epoxy anchors for your sill plate on the old part of the wall. Obviously on the new one you would set J bolts on the concrete as you fill the cinder block holes. The tubes of epoxy you buy for this will tell you how deep and how apart the rebar needs to be.

I think nowadays code requires you to fill every single hole.

Warning; I am not a trust worthy source for anything I just said.

 

[rodrigger]

thanks joey...due to covid no engineers are available one on one , so have to scan pictures and wait for reply.
Yes redhead...I have the plans for the 5year ago when I did the extension to my house( added a 1000 sqft to the back of the house), the plans were approved and those walls have a solid footing under the slab.
Thanks Don...I was thinking on the same line....but will submit/email my plan to the engineer and see what he has to say

cheers

 

[ford33]

Are you located in Australia?

You should ask the building department in your area for the source of local building codes and that will give you an idea if you can build on that concrete retaining wall. You don't mention the height or construction type of the planned building so it is difficult to answer your question. You may have to deal with wind loads and earth quake issues in your area.

I doubt a concrete retaining wall has sufficient depth, width and strength as a proper building foundation. Check your codes.

 

[rodrigger]

Canada

the concrete foundation wall has a footing . I have a picture somewhere when the forms were made and also when concrete was poured.. just cant find it now. Its a load bearing wall as i saw it being built. Anyway i have sent it to the engineer