One suggests outside ground work while the other wants to do urethane injections. The Detroit News. Thus far, we have two estimates and are troubled by the differences in procedure. The urethane injection company will give me a lifetime warranty, but I am concerned with the possible impact of urethane. While I understand it is 'legal,' I am concerned with the environmental impact of urethane and the possibility that it may contribute to future respiratory problems or environmental illnesses.
Injection is usually a faster, less expensive method of fixing leaks.
The elastromeric compounds hold up to the expansion and contraction brought about by seasonal changes. Neither you, nor the environment, should have any problem.