grscanadainc.com 1 Gail M. @2016-05-28 Stay Away. We had them repair 2 spots on our Flat Roof and both still leaked after repairs. They sent 2 different people out to look at it, as each person who came prior no longer worked for them. Still would leak and one guy said we need a whole new roof, which we were not informed the 1st time. Had a different company come out and refix the repairs and they said that GRS did not seal a lot of spots and many other steps were missed in the repair job GRS did. They have a nice website but very poor workmanship, not sure if the staff they have are licensed roofer, will never use them again and they need to be put out of business.