GROUT VS. POLYEURETHANE
ITEM	POLYURETHANE	GROUT	COMMENTS
COMPRESSIVE STRENGTH	71 psi	80 - 2,400 psi	As a foam, polyurethane can only harden to approximately 71 PSI. Grout, on the other hand, contains fine aggregate (rock) which is itself very hard. Without any cement added, the PSI is approximately 80 or greater, however, the total PSI can exceed 2,400 depending on how much cement is used in the grout mixture.
CURING TIME	Immediate	Immediate	Since both polyurethane and grout are injected under pressure to raise slabs, it is the pressure alone that keeps the slab in position. Concrete surfaces can be used immediately after raising with both materials. Grout, however, will continue to harden as time elapses.
SHRINKAGE	1% upon injection and 3% after 10 years	1% during curing and no volume change thereafter.
ENVIRONMENTAL IMPACT	Companies using polyurethane claim the chemical is "environmentally neutral"	No environmental impact	Grout is simply materials from the ground, often just sand and clay. Polyurethane is a chemical mixture that can break down over time or when exposed to organic materials. Long term environmental studies have not been produced to show that the polyurethane will not negatively affect the environment and specifically drinking water when it breaks down.
EFFECTIVENESS	Effective at void filling and raising slabs.	Effective at void filling and raising slabs	Both materials work equally well in these functions.
SPEED	Both processes are equally fast.	Both processes are equally fast.
COST	Priced by pounds of material used	Priced by job quotes	Polyurethane is priced substantially higher than grout and typically quotes do not include clear pricing and are based on the amount of material that is actually used.
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