Reply by MrRon

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Posted on What screws to use for floating vanity frame?

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6023 posts in 4326 days

#1 posted 12-10-2017 08:00 PM

You have to realize the weight of the sink is equally distributed around the lip of the sink, which is closer to the walls. The shelf itself won’t sag, as the weight is not concentrated at the center of the shelf. Besides, 2” thick maple is pretty stiff all by itself. I would recommend 4” star drive deck screws, 2 per stud is adequate. Anymore and it is overkill. Just make sure the supports are screwed tightly against the wall. You want as much tension applied to the screw to reduce the shear on the screw. You do not want to introduce bending in the screw.

PS; Don’t use stainless steel screws. 1/4” lag bolts are also OK

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