Thread: Help in Building Granite top Desk

Do a line (bead) about an inch in all the way round, Then do a W pattern between the box you have created running about 50mm apart. Place on granite and let it settle under its own weight. Give it a light jiggle to help with the bond and measure to make sure the ply is positioned properly, leave 24 hours to set.

Will do that, thanks

Silicone, I agree. Pattern, no. To allow for air to escape as the granite settles into the silicone (no trapped bubbles).
Squirt out the biggest MONSTER 'X' on the plywood and get a second pair of hands to help you set the stone in square.

OTOH, why glue it down at all? My 5 most recent desks and benches (several 240cm long) do not have attached tops.
What's to get the desk top to jump around?
1. There's bound to be all sorts of stuff stacked, piled, stored on the bench.
2. The Law of Gravity is your friend.

Mind you, I haven't built a stick frame desk in at least 5-10 years. So far, nothing has shifted.
That speaks to the piles of books and things on the desk to keep the tops from floating away.

Originally Posted by johnc

Silicone will do the trick, plenty of squiggles though

Agree. Granite countertops are installed using silicone.

Speaking of gravity to secure the granite itself (without glue), I think if I put a layer of anti slip mat between the plywood and stone, combined with the weight of items which will be on top of the stone (27" monitor and keyboard), it will pretty much makes it very hard to move?

Antislip mat will work just fine. What the Hello are you doing for the risk of your GRANITE desk top sliding around?
Honest to goodness, that sucker ain't gonna float off in the night.

I use slip mat under my wood carvings so they don't jump around. Right now on the bench, 2 x 18kg cedar blocks for feast dishes.
2 posts for story poles, 15cm x 15cm x 160cm. Mostly adze work for the roughouts, the strike force is wasted in wood that moves.
Solid as she goes!

Yeah I think I might do just that, especially this would be a study desk and would be against the wall, so you can only pull, not push the slab.

I'll see if it moves around then I will apply the glue

If your design doesn't provide continuous strong support, more than just plywood, you should consider having the slab rodded with fiberglass reinforcements too if it isn't already.