Supporting A Granite Top On Glass Blocks
Posted in Answers to Granite Questions..., Installation Issues, Other Topics on August 23rd, 2007We are redoing our kitchen and are building a 122″ island. We would like the island to have glass bricks serving as a riser for our raised bar. The bar area will over hang about 12″. This overhang will have granite (Juparana Beach) on top of the glass bricks as well as on the counters. I have a couple of concerns:
The Glass bricks are 7 3/4″ square X 4″ wide. Will this raise the bar up too high? (I don’t know what the standard rise should be.)
Will the glass bricks be strong enough to support the granite?
Should the granite be supported with something on the overhang (corbels)?
Dorothy
Hello Dorothy,
Thank you for a very interesting entry. This is the first time that I have heard someone using glass block to support a raised granite countertop. First of all, the height is correct. The normal height of kitchen countertops is 36″. Raised upper countertops are usually 6″ higher at 42″. Given the 4″ block plus the thickness of the granite and subtop, the finished surface should be at just about the right height. The height is actually driven by the normal height of bar stools so stay as close to 42″ as possible.
Now the more difficult part of your installation is the support intended. Resting the granite on the 4″ wide glass block and extending it out about 8″ to make 12″ overall will not be adequate support. You need to create another form of support that is positively affixed to the cabinet and let the glass block be for décor only. Although the procedure is complicated, you can do this by having a steel support designed and bolted to the cabinet and then use 2″ wide block on both sides if the steel riser, instead of one 4″ block. Basically, you would sandwich a steel plate on both sides with glass block.
The vertical steel supports should be ¼” thick and have vertical legs that are about 3″ wide each, at about 12″ apart. These will need to be bolted in to your cabinet. At the top of theses vertical plates, you would need to have a large plate of 3/16″ steel welded to them at a 90 degree angle. This will be an adequate platform that the granite will sit on. Talk to your local granite company about this plan and see if they can do it for you.
If the information above seems way over your head, here is another option that might just accomplish your design intent. Have a wall built for the upper countertop which is typical to industry standards. This would be framed out of wood and a plywood subtop screwed to the top stud. After you are done with the drywall covering, install glass tile for the backsplash. There are beautiful glass tile options in sizes from 1″x1″ to 6″x6″. Here is an example of very low priced glass tile that is beautiful: http://www.daltileproducts.com/series.cfm?series=119.
I hope that I have helped and thank you for supporting The Rock Blog’s World Vision Kids.





