Quote:
Originally Posted by brendabee
I need advice on a outdoor deck with truss supports. Right now it has a rubber membrane to act as a water barrier to the trusses, and over this is marble slab pieces grouted together. It has been outside 4 years and now the grout is crumbling. It has never been secured to the membrane and was wondering if there is a adhesive that will secure it to the membrane. Then i can grout with a silicone based product between the pieces and hopefully it will be more secure and last longer. I live in Missouri where it goes through winters.
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It was not secured to the waterproofing membrane on purpose so that they could move independent of each other, thus not stressing and eventually tearing the membrane. I would clean out the old grout and redo with a more flexible product as you suggest.
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