One of the best parts of DIY Network Blog Cabin 2015 is finding old materials and repurposing them. When we found a pile of travertine at the top of the hill, I was excited and baffled. Contrary to the other materials, it just didn't seem to fit with this house.
Upon later discussion with the former owner, he had removed this stone from the upper fireplace and carefully numbered each piece so that it could be used again. Luckily for us the pieces were sized perfectly for two stone sitting benches inside the new air lock.
Start by finding the pieces you need. The top should be somewhere around 16” x 36” and at least 1.5” thick to prevent cracking. The legs can be several pieces joined or one solid piece.
In our case, we found 5” tall pieces about 3 1/2” wide and 12” long which were the perfect size when stacked (3) tall. If you don't have a source of reclaimed materials, a stone yard can be an easy way to find what you need cheaply if you ask for small lots or remnants.
Using an angle grinder, cut several shallow slots in the top and bottom of each leg segment. This will increase the holding strength of the adhesive.
If these surfaces are smooth also scuff them up with the face of the grinder wheel. In our case, the original cut edges were rough enough.