Contractors promoting poly-foam as an alternative to conventional Mudjacking...lie:
Poly-foam jacking is not an alternative to mudjacking. Here's why:
- Poly-foam is far more costly then the natural mud material used in Mudjacking, which is why poly-foam contractors will avoid estimating large cavity filling, such as a step cavity. Certainly this is evidence of their lack of credibility;
- While poly-foam is a lighter product, less weight is of no benefit to a sub-grade, which is typically backfilled with clay and compacted; Further, poly-foam projects would be lighter due to all the cavities left under the slab;
- Poly-foam jacking cavities provide unsanitary rodent habitants under the slab, which will ultimately result in damage to the adjacent landscaping;
- Mudjacking does not require heavy equipment, unless you’re a wimp when it comes to any work;
- Mudjacking cures equally as fast as poly-foam and driveways can be driven on within a few hours, however since poly-foam jacking projects result in a concrete slab coving nothing but a cavity, it would be advised to never use the driveway again;
- The use of larger grout holes are required to not only raise the concrete slab, but to monitor the cavity filling progress under the slab, something not monitored by poly-foam jackers because they do not want to know the extent of the cavities not being filled under the slab;
- If further sinking occurs, subsequent injections with poly-foam will result in a snowman shaped poly-blob under the slab, thereby creating even greater instability condition;
- There is nothing safe about poly-foam applications involving a compilation of environmentally hazardous substance being dumped around your home;
- While poly-foam does chemically expands in all directions it will only totally fill a void of approximately a 12-inch cube, before the material solidifies and stops flowing, actually leaving a cavity in all directions under the concrete slab. Whereas, Mudjacking material is flowable reassuring all cavities are filled and the concrete slab is completely supported on a grade.
- As mentioned above, once water gets into the foam pores and freezes, it will breakup into pellets, to be easily eaten by birds and other animals as your concrete sinks.