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Products & Solutions: Concrete Slab



In cases of rat entry through the ground, concrete may be the best option to install in an existing crawlspace.  There are some negative results to be aware of when choosing the concrete slab option in crawlspaces. Concrete is made with large quantities of water, and therefore shrinks as it dries.  This shrinkage results in cracking and separation from the foundation edges. The apparent seal by using concrete is immediately lost once the concrete is dry. Concrete being poured in an existing home will also create a high humidity situation for several weeks, and the home itself will become wet, possibly warping floors and creating a mold potential.  Good ventilation afterwards will be important steps to take to avoid this. Lastly, concrete that is pumped into a crawlspace is made with large quantities of fines, such as fly ash and portland cement. The basic darby float finish does not “tighten” the surface because installers do not complete the install with a “steel trowel” finish, and a high silica dust and scaling will occur at times.  

This review is long overdue. After looking at other companies, Nu-Crawl was who we chose. If you do your research, you'll understand why. What was once a disaster of a place is now somewhere you don't mind going into to for extra storage. What I find unbelievable is with the recent negative 24 degrees we experienced in the Chicago area, the crawlspace feels warmer than the 69 degrees I have my furnace thermostat set at. Sooooo glad we went with Greg and his crew and product.

- Karen Munthe

Great company, Great system, Great people. If you want the best these guys are it. Do some homework and you'll see. Thanks for great job on the crawl space.

- Kevin Wilson

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