Getting a smooth underlayment for Linoleum flooring
Hello again!
I am planning to install linoleum flooring in my kitchen, for that super retro look. :) The installation instructions stress that the underlayment must be as SMOOTH as possible. Any indentations or imperfections will show through the linoleum.
My underlayment is plywood, CDX (underlayment grade). It is pretty smooth... I had to fill a couple of small surface knots with wood filler, but mostly it's a good surface.
BUT! Installation instructions for the plywood specify that a 1/8" gap be left between all panels, for expansion.
Now, isn't that gap going to show through my linoleum? What can I do about that? Can I FILL the gaps with wood filler? I would think not, since that pretty much defeats the purpose they serve, right?
Is it possible that the gap they specify is meant for outdoor sheathing uses only? (the instructions stamped on every piece of plywood do not say one way or the other) Would the fact that they're indoors, in a relatively controlled climate, mean I could fill those gaps and not worry about some kind of terrible expansion ruining the whole thing?
Any advice is greatly appreciated, as always!
Cheers, james
Suggest Screwing versus Stapling
I was watching a home improvement show the other day called Holmes on Homes. Basically, it follows a contractor (Mike Holmes) who goes to home to correct issues caused by shoddy work done by other contractors. It is seen on one of the Discovery Channels.
What Mike was doing on that show was repairing a floor issue caused by improper preparation. He ripped up the flooring and put down new subflooring. What he strongly recommended was to screw the subfloor into the joists. And to use as thick a subflooring as you can. This is especially important when doing tile work requiring grout.
The subfloor he ripped up was held down with about 300 nails. Mike estimated that he used 3000 (yes thousand) screws. Granted in this case the joists were undersized (2x8 where 2x10 would be required now) and he wanted to stiffen up the floor by making sure that the subfloor was stronger.
He implied that nails wouldn't be strong enough as they may pop loose. Perhaps using a ring shank nail may be enough as they are technically a screw.
Mike didn't put down a 1/4 luan layer as he used an isolation membrane to protect the tile from cracking. But, I have come across other sites which do put down a luan layer. Maybe this can be stapled down without any problems.
But, for my projects, where I am tiling, I will be screwing down both layers of subfloor. Whether it be a 1/4 luan or cement board before I put down any tile.
One of the home improvement big box stores (Menards) in my area carry a 4x4 sheet of plywood called plyfloor. It is marked with x's to indicate a fastening pattern and is not luan. It is not luan.
As for putting in filler between the sheets of plywood, I wouldn't recommend it. Most hardwood flooring installers don't recommend using filler as wood expands and it would pop out the filler.
Good luck, and I hope this helps a bit.
Dan