I am building a patio home (concrete slab) and they will soon be pouring the foundation. One concrete worker that I know suggested that they should use 8 gauge mesh vs. 10 gauge mesh. I don&#;t know much about concrete to know if that would be a good idea for the extra cost or not. Approx. sq. feet. Any help would be appreciated.
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This is my first post with FineHomebuilding. Looks like a great place to get some answers.
Thanks.
Rebar, or reinforcement bar, is perhaps the most widely recognised building material in use &#; yet whilst the ordinary person in the street might know what it is, many people underestimate just how vital it is to building projects of all sizes. In this article, we&#;re going to take a look at how rebar and reinforcement mesh are used within concrete slabs, and we&#;ll answer some common questions about concrete slab reinforcement.
Perhaps the most widely asked question is whether you need to reinforce a concrete slab at all. The answer to this is that it depends on the depth of the concrete being poured and the purpose of the slab itself. Generally, if you intend to pour a slab that is more than 4-5 inches deep, you should use a reinforcement product such as rebar or reinforcement mesh. Also, if there is expected to be high load on the slab (such as with a driveway or forecourt), then reinforcement will certainly be required.
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Again, this depends on several factors, including how the slab will be used. If the slab is beneath a small potting shed, for example, where there will be very light use and no significant weight put on the slab, and the slab itself is of a sensible thickness, then serious cracking is unlikely. However, adding rebar can still be a good idea, even in projects that do not technically need it, since steel reinforcement will add significant tensile strength and reduce the chances of cracking. Wire reinforcement mesh is a straightforward alternative to rebar rods in concrete slab projects.
The placement of rebar or reinforcement mesh within a concrete slab depends on whether it is being used for structural strengthening or to mitigate against shrinkage and cracking. If the reinforcement is intended to add structural strength, it will be placed lower down within the slab depth than if its purpose is to reduce cracking because of shrinkage or temperature change.
Rebar and reinforcement mesh should be laid out for consistent coverage of the whole slab area, and should be supported and tied together in order to prevent movement as the concrete is poured. In order to prevent a height buildup where panels of mesh overlap, flying end mesh can be used &#; this has one length of rebar removed along one edge, so that there is no additional height on the overlap.
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