I am currently building an island for our kitchen and would like to have it ready to install a countertop. The island will be 6.5 by 4 feet, and will have 2 stools (one at end and the other at corner along the long side). There will essentially be an "L" shaped opening, with about a 2 ft overhang next to wine fridge (see pic). Please note that I am not done framing the island (ie. there will be more support), but the overhang next to fridge will be the same. Also, I will have much beefier pillar supports. We are not sure what we are going to go with for the counter, but it will likely be granite or quartz. My question is, will I have to install plywood under the counter? I am guessing yes with the overhangs..but if so, what size plywood? 3/4?
When I had my countertops done (the Samsung solid surface stuff) the people who were supplying the countertop also supplied the plywood base needed.
So basically I just had a series of base cabinets sitting there, then they measured w/ a camera and some paper "targets"... a week or so later they showed up with plywood and countertops all ready to go...
So I'd check w/ whoever is providing the countertop first...
My advice is based on anecdotal knowledge or personal experience. I'm not a professional no matter how matter of factly I may say something