What would the minimum thickness of the pour need to be be to accommodate 1/2" rebar on 6" centers (in both directions)? How likely would it be to have a crack show up doing that with 5000 psi concrete delivered with glass fiber added? I don't know how much the glass fiber increases 5000 psi...
The cement board (or plywood is another option) was intended to support the concrete pour and then be abandoned in place. I can pour the slab thicker than the proposed 3" (1/2" thicker on the front edge to hide plywood or cement board would make a 3.5" front edge). If analysis says a thicker...
I wish there was a way to go back and edit pervious posts . . .
cvg I was obviously referring to you in my previous reply above; see (cvs) typo
racookpe1978 I can see how adding a deeper ridge in the bottom of the countertop form near the front edge (or even in the middle) would strengthen the...
hi racookpe1978
Yes I could open up the countertop form and pour a lip along the back edge over the entire length. But I already have a 2" X 4" pony wall supporting the back edge of the concrete form that will always remain in place. Are you thinking I need to pour a thick back lip in...
Jared
I really appreciate your comments. Something I could do is build two vertical forms: one next to the cabinet (left end of the slab to the right side of the existing cabinet) and build a 2nd vertical form on the right side of the slab next to the masonry wall. I can anchor rebar to the...
Hi Jayrod
I've used #3 rebar 4" o.c. in 3" cantilevered slabs before. There's enough room in the form to get a good pour and I was planning to go both directions everywhere in the form. Unfortunately I have nothing on the left side to tie the rebar into (just a large surface areas support...
I thought this was a forum for engineers by engineers who comment when they have relevant background and experience? I realize the person I'm looking for may not be here; in fact that seems very likely at this point based on comments so far. I'd be happy to pay an experienced engineer here...
Thanks for your reply oldestguy. I provided a to scale drawing and construction details along specific questions. Let me know what was lacking in the original post.
I have to laugh at your reply. And unfortunately you have not helped. As far as my question goes; 1/2" cement board is more structural than 3/4" plywood because the concrete pour will bond with the cement board. I did not comment but there will be an extensive temporary support system under...
My Engineering license and experience is in Mechanical Engineering and HVAC. I'm also a licensed General Contractor working on an unusual project pouring in place two office desks shown in the attachement provided below. The countertop at the top of the page is my bigger concern of the two...
