tiling, underlayment, subfloor, screw length

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megadice

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Hello,

I'm installing some tiles.

I have a 5/8 plywood subfloor. I need to add 1/4 inch to one room to make it the same height as a connected entryway that is getting the same tile, which we want to be continuous.

I am using 3/4 #8 wood screws to lay down the 1/4 inch plywood. It feels like less than half get a good 'catch'

I feel like I read somewhere that any screws should not go through the subfloor (moisture/vapour coming up?) so I'm hesitant to increase the screw length but I'd love to use a longer screw. Is it OK to increase to a 1 inch or 1 1/4?

FWIW, the level below where I'm tiling is an unfinished basement. Overtop of this 1/4 plywood tiler will install ditra then large format (24x24) tiles.

thanks in advance!
 

bud16415

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I don"t think longer screws would hurt, but I would like to know what kind of wood screws you are using now also?

Welcome to the forum. :welcome:
 

Rusty

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Screws are a bad idea. They make the plywood pucker.
 

gfw

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Screws are a bad idea. They make the plywood pucker.
Screws are a bad idea for plywood underlayment? Why would they make the plywood pucker (assuming one has properly countersunk)?

I'm using ring nails along the joists and screws generally otherwise because the ring nails just feel weird once they're through the subfloor.
 
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