***** I've noticed that once you cut something too short, no matter how many times more you cut it, it's still too short...

Thanks

Plywood has voids in it and can cause hole from high heels, and so on. The reason for underlayment is to raise floor up to match tile or carpet and a very smooth surface. However particleboard does suck up water if flooded.

I agree with you. I think a backboard is better in bathroom if they're going to tile it.

With a thicker product you could screw it down for sure ,but keep the screw heads counter sunk a bit and then fill them when you float the floor. On thin materials like I'm using here (5/16") its pretty hard to counter sink a screw into it without going right through .

@@HouseImprovements great! thanks!

@@HouseImprovements are panel board nails "ring shank" the proper nails? i couldn't find any called just "ring nails".

most glue down wood floors can go right not the plywood. Check the manufactures suggestions.

please use my forum. www.house-improvements.com/forums/

+Jeff Porter Ring nails unfortunatly, are the next best IMO

Thanks for the instructions. Very helpful. Will 18 gage staples work or do I need 16 or even larger?

You need a good smooth surface to lay the flooring on. That is the main reason for a new underlayment.

Please use our forum for help. www.house-improvements.com/forums/

Yes.

leave about an 1/8 from the drywall and 1/16 between sheets.

No. Do NOT glue underlayment to the subfloor. And don't use particleboard for underlayment, as was done in this video.

the mortar would have very little strength once it was watered down enough to spread thin.

HouseImprovements What would be a good adhesive between 55 year old plywood and new fiberboard? Glue and staple then vinyl floor? Thanks.

yes

+Michael s Not necessary when the nailing/stapling is done correct, but you can if you want.

If the plywood is in good shape and no real gaps between the sheets you may get away with it. The problem is if it flexes much when stepping on it the self leveller may crack and loosen over time. The underlayment helps to span joints in the plywood to reduce the flex.

You could use sanded plywood but not sure that is your issue. I would place a floor protector in the chair area (clear plastic panel) to keep the wheels off the floor. The movement is releasing the glue.

The press type board is very very common here for under vinyl so that is what I use. For tiles I use products like Ditra uncoupling membranes. If you come to my forum and ask about subfloor options for under tiles I will answer it better there. www.house-improvements.com/forums/

Right on. I'll enlist on your boards. Thanks.

I watched a professional flooring company use that exact stuff a few years ago in a house that had flooded. Five years and it still looks great and no oddities in the floor.

Use the floor leveller on the top of the underlayment. I have never painted or treated the underlayment, I suppose you could as long as it did not cause problems with your glue.

NEVER ever use self leveling cement on particle board or mdf. Some even say not even to use it on OSB. Self leveling compound/cement is best used on plywood after your subfloor is to the correct thickness to support the finished flooring you're laying.

1-3/4" deck screws would be fine for both.

That would be fine under vinyl plank as well.

There is a sub floor foam adhesive made for the actually plywood installed on the joists.

@@HouseImprovements it’s a house with subfloor planks on the joists. I am planning to add a 3/8 plywood on top to resurface the floor prior to installing engineer flooring (staple down). Would you recommend I install the plywood sheets on the subfloor planks with foam adhesive or just screw down

If you have large gap or staple holes fill with floor leveller

generally not needed for laminate

Okay, Thanks for the quick reply.

Particle board void the warranty for vinyl. The manufacturer wants you to use a plywood that is rated for underlayment...and yes you do have to prep the board seams so they don’t show through the vinyl

Yes it will definitely work and be sturdy enough that it won't shift. I like to use 1/4 inch plywood which people sometimes call it "luan" and screw it down with 1-5/8" screws just in case the subfloor was squeaky it won't be anymore!

sub floor ring nails hammered in by hand

I wish staples were never invented.

Not in this material , screw heads will not sink below surface enough

This product is really to thin to screw

No, not with carpenter glue for sure . Maybe v notched trowel applying construction adhesive but it would be a real PITA to remove down the road. The ring nails or staples work great

@@HouseImprovements The problem is i got a floor heating so that is why i thought may be i use glue and other thing is how did you level your floor is it after you install new underpayment ??? My sub floor is not level should i level it first level it with quick leveler than I install the new underlay or after i install the new underlay . My aim is to install new under lay than Schulter Ditra and 24x24 tile but the other problem is the floor is not level by the way what this wood calls the one you use would i be able to use it for tile thx

if the subfloor is smooth and a proper product that you can cover with vinyl sheet flooring. Our forum is a great place to go when you have questions.www.house-improvements.com/forums/

You could use sanded plywood but the cost is much more. Particle board can swell if you have a good leak but in most cases you will have no trouble with it.

That's a terrible excuse for using the worst underlayment product ever. In the average bath, the cost is not much of a factor - it wouldn't break the budget, especially when you explain to your customers' the pitfalls of using particleboard. I installed flooring for most of my 40-year career in flooring. I pulled up a LOT of particleboard whose flooring would have lasted much longer had it been installed over a better underlayment. You pointed out the area that got wet - it's plainly visible - so how can you say there won't be any trouble with it? I've seen p-board so bad it popped right off the subfloor, or crumbled in your hands from constant exposure to small amounts of moisture. You explained that the underlayment should also be perpendicular to the joists. That's true, if you use the proper underlayment product, underlayment quality plywood. You didn't. You used particleboard, which has no grain or direction. You can orient particleboard any way you want. For those too cheap to use the right material, it helps you pinch a penny even tighter, creating much less waste of material. Finally, the pressure of your air should set the staple FLUSH with the surface of the underlayment. Allowing it to countersink as much as "no more than an eighth" inch is compromising a full third of the material. I realize adjusting the air pressure isn't an exact skill, but you should not suggest that allowing a countersink of 1/8" is acceptable. It's not. Other than those important points, this is an excellent video that helps the DIYer build skill and save money.

If it is not to out of level it should but if you really need to correct quite a bit then you may need to look into self leveling cement patch and go thicker than the skim coat the Shannon used here ! If it is really really out of wack then you may need a couple of applications ! If you really want Shannon and his team's help then it maybe best to go to his website and click the forum tab ( I think it was near the top left of the page ) and see if your question has already been asked or see if you can ask your question there !

backer board is not smooth enough to apply vinyl sheet flooring to.

Backerboard is mainly use for tile

jig saw

He used a jigsaw. Remember his comment that if you don't know how to use the tools, you probably shouldn't do the job

Typically if you try to screw this product down you are unable to counter sink the heads of the screws enough or if you do the underlay mushrooms up around the screw head and needs sanding.

drywall screws are not very strong...and depending what of floor your laying, the heads make a pretty good dimple

not under vinyl sheet flooring .

Yes, I am from Saskatchewan

You could but it really makes for a difficult removal down the road, subfloor glue is usually used to secure the plywood to the joist though

cost mostly. Also most plywoods have voids under some of the finish layer and those can cause issues don't the road with the flooring.

THEN DONT. If they guy had problems with it he wouldn't be using it.

I think its called underlayment not subfloor. Sub floor is what attaches to joist if I am correct.

Ring shank flooring nails

@@HouseImprovements Hello mate, my floor boards has a hairline joint which is open to the subfloor. When I glued vinyl sheet directly to the floor boards without underlay, the vinyl bubbles along the floor board joint. I'm really puzzled. Do you know why.

bad comment, try using a different adjective other than the word bad to start out your comment. Try and be more positive. People are much more receptive that way.

Cut the pieces how you wish. usually the flooring should stop half way under the door, so place your underlay accordingly.

@@HouseImprovements Thanks boss, love your content