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See Structural Thread 507-179186 Concrete Cover w/Vapor Barrier. Here are some references that address this issue. http://www.post-tensioning.org/pdfs/sog-faq3.pdf http://www.nrmca Concrete In Practice CIP29, Vapor Retarders Under Slab on Grade. ACI recommends vapor retarders for all slabs which...

See Structural Thread 507-179186 Concrete Cover w/Vapor Barrier. Here are some references that address this issue. http://www.post-tensioning.org/pdfs/sog-faq3.pdf http://www.nrmca Concrete In Practice CIP29, Vapor Retarders Under Slab on Grade. ACI recommends vapor retarders for all slabs which...

Has anyone used a Soff-Cut saw for Sawing Slabs on Grade? While it is propietary it has some things I like in that sawing can be done within 1-2 hours after placement, cuts dry without water, and due to rotation of blade minimizes raveling. I don't know how many of you are sick of hearing from...

rgerk; Thanks for your reply.I did not intend for you to have to read between the lines. Usually the details I am referring to the below grade reinforced CMU Stem Wall extends up to grade and the exterior CMU wall extends from there (often single wythe) which I tried to cover in my last post...

I review Structural Drawings for a design/construction firm. Architects & Structural Engineers, often detail CMU/Brick being used below grade, without being waterproofed.(not talking about basements) This is especially disturbing when CMU stem walls are supported on spread footings extending to...

Concur with jike on previous post. Featherlite, NCMA TEK 12-4D Steel Reinforcement for Concrete Masonry under Joint Reinforcement states, the same requirement as you originally stated, "In addition, joint reinforcement must be placed SO THAT THE LONGITUDINAL WIRES ARE EMBEDDED IN MORTAR with a...

Assume you mean reinforced concrete walls not CMU. Recommend you go to www.nrmca.org "National Ready Mix Contractor Association" and go to CIP 7 - Cracks in Concrete Basement Walls, which uses spacing of about 30 times the wall thickness, with some other recommendations. I have used this and...

While everone has some valid points, I agree with JAE. He outlined the steps you need to follow per ACI and that is essenttially what we did in the reply that I gave. While most everyone would like to take the non-compromising position to tear it out, you must follow these procedures first. Then...

I have read the posts and I have a couple of comments that may help as we just went through this on four buildings where 25% the column strengths were less than the specified 5000 psi. One 56 day test result is not considered a test as two cylinders are required to constitute a test. Therefore...

I would think you could use a "R" Meter or Pachometer to determine the rebar spacing & roughly estimate size, but taking core over the located rebar should be done to determine exact size. I would think this would be less expensive than x-raying etc.

Concur with mrengineer, as I have shown "Z" staps at corners. It is interesting to note Featherlite, National Concrete Masonry Association does not specifically address this in TEK 5 9A CMU Corner Details, TEK 10-2B Control Joints For CMU Walls - Empirical Method or TEK 10-3 Control Joints For...

I review Structural Drawings on numerous Commercial Buildings across the U.S.A. If properly designed there is no better wall system than a double wythe masonry wall with CMU backup and Brick Veneer. I do not understand how most architects appear to be driving the train when masonry construction...

I agree with post that indicate the 3" clearance is for concrete cast on soil, due to the irregularties of grading the surface. Five inch minimum concrete slabs on grade reinforced with #4 rebar @12" each way are are often used, specifying 1 1/2" clearance from top of slab. Therefore, the...