Only downside is it shrinks under heat. Had it overlapping by a few inches, 2 days later it shrunk up by about 3 inches. Still worked for what i needed.
I used this under 4" of paver base for an artificial putting green installation. Thickness and permeability is as advertised. Cuts easily with a utility blade or scissors.
Just laid it out today and think it will work fine. It seems to be thick enough to keep weeds from growing through And will have rocks 2 inches thick on top of the shading. So it should be fine. Fingers crossed.
Leonard Russell 
