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I'm planning on replacing the carpet in my dining room with a vinyl sheet flooring. I know I need to get the carpet, padding and any staples/debris cleaned up before laying the vinyl, but do I need to do any other prep work on the plywood subfloor (ie. fill cracks between sheets of plywood, etc.)?

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Vinyl isn't very thick, and it is quite plastic. This means that over time, it will conform to the shape of the floor beneath. This means that you will see grooves in the vinyl where there are gaps between the plywood sheets.

This means you want the sub-floor to be as smooth as possible. BUT!!!! you need gaps between the sheets to allow for expansion or else you risk having the sub-floor develop a slight buckle.

Here's what I would do under ideal circumstances:

  • Spend some time screwing down the existing floor to the joists. This is likely the only opportunity you will have to do so.
  • Get some 1/8" Hardboard, Lauan or birch plywood (one side smooth) and lay it down without gaps over the sub floor. At this thickness, you can staple it down.
  • smooth any edges/fill any gaps.
  • Lay your vinyl.

However, you need to make the call as to the quality of the existing floor the level of imperfection you are willing to tolerate. It may not be worth the extra expense and labour to do it this way. In which case, I would fill the worst gaps, sand down the worst edges, and lay down the vinyl.

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After making sure the surface is clear of all miscellaneous stuff (staples, nails, tacks, etc.), inspect for dry rot or weak areas—hammering the surface to test strength every foot or two would not be overkill. Replace any substandard panels.

Then use a leveling compound to "erase" any knots or gaps in the wood. If there are holes, plug them with a dowel or other similar means, sand smooth and (if needed) use leveling compound to smooth them out.

Also, stomp around on the subfloor to identify any loose edges and squeaks. If you find any, screw the areas securely to the floor joists. Beware of squeaks coming from the floor joists, though typically most are caused by the subfloor edges rubbing against itself or against the joists.

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Correct ..tie all floor joists with metal hangers and blocks ..pull rotten ones out replace new ..screw down birch finish plywood one side smooth unsmooth and rough side and holes down .float any troops after or even better retire floor joists level,before sub floor ..float only with super hard floater do not use spackle or joint compound that's nasty and does not work ..it crumbles and molds and cracks ..you can glue and screw sub floor if clean and new you can primer too as long as primer is pacificly for adhesive going down for glue ..we also use a weed burner to heat up raised commercial flooring pvc vinyl .. but don't burn it just get it warm ..it lasts 20 years with high foot traffic ski boots snowmaking run off and floods water ..if on concrete power wash wet vac dry float heat up roll as you lay it down

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    Hello, and welcome to Home Improvement. There's good information here, but it's hard to read. Would you edit it to break it into sentences and paragraphs? Thanks. – Daniel Griscom Apr 20 at 0:19

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