Flagstone Mats on thin-set concrete.
by John "Red" Burke
(Nevada City, CA)
Should I seal this deck?
We have a 1300 sqft elevated deck with flagstone mats. We did a thinset concrete over an impermeable membrane on 2 layers of 1' plywood. We are at 3000 foot elevation in the Sierra. We get 2 or 3 snow storms a year averaging 1 to 2 feet and about 30 inches of rain. Our property is on a North facing slope in the pine trees.