Frost Wall Extension

[bigmig]

I got a frantic phone call Friday where my contractor explained that somehow, they had poured the top of concrete
wall on a residential house, exactly 7. 1/2 inches too low.

WHile pondering this in my sleep, I came up with this concept as a fix.

The new CMU Block + Grout would be 8 inches,putting the top of wall 1/2 inch higher than originally planned....which we can
live with.

I wanted to run this by everyone to get your take on if you think is a terrible idea, or practical.
See attached detail sketch.

Thanks in Advance.

 

[phamENG]

Has the lumber been ordered/delivered? If not, I'd say chip down the wall and bear the floor on a plate.

If that's not an option, I'd rather see the wall extended:

Option A) chip down just far enough to couple bar extensions. Either mechanical couplers or weld it (if the chemistry allows - A615 usually just has more complex preheat requirements). Built up form work, and pour the concrete.

Option B) Roughen the top surface and drill and epoxy rebar with hooks into the wall below.

While your idea probably works, it looks like a mistake. And anything that looks like a mistake will come back to haunt the owner later.

 

[dik]

As long as it's not exposed to soil, it should work OK, in particular if it has rebar going into it... or the rebar was short, too, and a CMU unit is roughly 7-1/2"high... It should be easy to attach a row of blocks and it appears the bottom of you floor joists provide additional support. It's a matter of maintaining the building envelope. Load shouldn't be an issue.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[bigmig]

@pahmEng we need the wall up so that grading can work. We cannot stack the joists on this job.
The house is too low relative to the final grade. Thank you for your response

@dik The rebar is completely covered by concrete. There is no weather-rebar issue.
The wall will be backfilled to within 6 inch of top of wall. We can waterproof pretty much anything on a vertical surface, so I do
not see that as in issue. Thanks also for your response.

 

[Aesur]

What about extending the wall up by epoxy doweling new rebar into the top for development length, many epoxies provide development length embedment for rebar. Additionally roughen the top surface to 1/4" amplitude. As for using CMU, I'm not opposed to using CMU, but I would probably specify a deeper embedment to achieve development length or lap other bars in the wall.