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<blockquote data-quote="red dirt shootist" data-source="post: 4149743" data-attributes="member: 52708"><p>I think the foam would be a lifetime fix, no UV under the slab, and as you know support should be thought of as pounds per square foot. when they drill it it&#039;s on 1 foot centers, so the foam is pretty much solid under the slab. It works well and it&#039;s what I would do, cost may be a factor, but compared to digging, mixing mud, doweling and just being a pain in the ass, it might not be too bad. After they foam they go back and fill the holes, so that could be a cosmetic factor. The plywood idea wouldn&#039;t last long, condensation would rot it out pretty quick. The digging and jacking method would work, but if your slab is big you will probably get stress cracks because the slab won&#039;t have even support, that&#039;s the beauty of the foam, total, even support, and quick. Be sure to get 3 bids, when you get into work of this nature, none of these guys know jack sh*t, but they are all crooks. Good luck.</p></blockquote><p></p>

[QUOTE="red dirt shootist, post: 4149743, member: 52708"] I think the foam would be a lifetime fix, no UV under the slab, and as you know support should be thought of as pounds per square foot. when they drill it it's on 1 foot centers, so the foam is pretty much solid under the slab. It works well and it's what I would do, cost may be a factor, but compared to digging, mixing mud, doweling and just being a pain in the ass, it might not be too bad. After they foam they go back and fill the holes, so that could be a cosmetic factor. The plywood idea wouldn't last long, condensation would rot it out pretty quick. The digging and jacking method would work, but if your slab is big you will probably get stress cracks because the slab won't have even support, that's the beauty of the foam, total, even support, and quick. Be sure to get 3 bids, when you get into work of this nature, none of these guys know jack sh*t, but they are all crooks. Good luck. [/QUOTE]

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