Basic Instructions For Adding New Subflooring Over Old Worn Out Subfloor

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Basic Instructions For Adding New Subflooring Over Old Worn Out Subfloor - Home Remodeling Part 6

Рет қаралды 25,253

Күн бұрын

www.homebuildi... Visit our website to learn more about home repairs, old house remodeling and building designs. This video will provide viewers with basic plywood or o.s.b. subfloor installation ideas, when installing over old 1 x 6 sheathing. With high lumber prices, do it yourselfer's should plan out the layout for each piece of plywood if possible to save money and time.

Пікірлер: 40

@joshpage139 Жыл бұрын

Fantastic video thank you. I feel way more comfortable going into this attic conversion as a new homeowner

@gregvancom Жыл бұрын

Great to hear!

@ricardoappelgren4499 Жыл бұрын

This is a great video, i would like to add that based on NWFA ( National wood flooring association) guidelines, minimum thickness for “double layer” subfloor is 15/32”, also you can’t fasten thru both layers into joists, you will have to do it separately, meaning 1x6 planks refasten if necessary, to joists and new subfloor fasten to the 1x 6 planks, they also recommend to glue new subfloor to planks. Thanks !

@gregvancom Жыл бұрын

Thanks for sharing!

@joshuamills2868 6 ай бұрын

I know this is what they recommend. I have done both methods and disagree with not attaching underlayment to joist. Pine planks have no holding power to fasteners. New cdx glued to planks, and screwed to joists decreases deflection dramaticly on old houses with undersized joist.

@Gubers 4 ай бұрын

I am going through this exact process right now. Already figured out all of this by means of asking an engineer and contractor and online videos and such. The one thing I’m confused about is in your video here, you suggest to lay the plywood ends over joists and blocking and attache to them. But other sources say to NOT screw the plywood to the joists to allow for better expansion characteristics but instead to screw it into the old subfloor everywhere but the joists. I am laying 19/32 OSB on top of old 3/4”x6” planks and was planning to just screw it all in avoiding the joists. And I wasn’t even worried about ending any of it on a joist or blocking because all of the planks are diagonal and already carry the load of the floor. Can anyone clarify if ending OSB or Plywood on joists and screwing into them is necessary or not when it’s going in top of existing subfloor?

@gregorysampson8759 Жыл бұрын

I appreciate the video. I prefer 3/4 t&g ply. It's probably 400 dollars for 1000 sq more money but makes a great subfloor overlay locking those edges together. I like 30 lb felt under it as a separator between layers. In some cases 6 mil plastic is also good. I'm planning one on a second floor where both floors are climate controlled and plastic will not cause any moisture issues. I've screwed 100% and sometimes screw and nail as he suggests. At any rate this is worth the effort because a solid subfloor really gives a great feeling to the project when done.

@gregvancom Жыл бұрын

I wouldn't use any thing that could trap moisture and cause wood rot, like plastic. However, I like the thick sheathing if your budget allows for it.

@brettking177 2 жыл бұрын

Thorough and well explained. Great job

@gregvancom 2 жыл бұрын

Thanks for letting me know.

@nunurbuisness5578 8 ай бұрын

Thank you so much. I have a home built in 1940. The subfloor isn't terrible but there's one small patch that has water damage. The kitchen has very slight deflection but it seems silly to replace it entirely

@WanJae42 2 жыл бұрын

Thanks! Will be doing this to a second storey subfloor soon. It needs to be strengthened, but it's also a little lumpy, and I want a proper surface to apply some self leveling cement.

@macjusss 2 жыл бұрын

Great videos and illustrations!!

@gregvancom 2 жыл бұрын

Awesome.

@jordan_garza Жыл бұрын

My original subfloor has a lot of high and low spots. Would you install the plywood over the original subfloor and use self leveler on top of the plywood? Or would you shim the plywood? Thanks!

@khalkhali1960 Жыл бұрын

Thanks for this

@gregvancom Жыл бұрын

No problem

@Gsxrnoob 2 жыл бұрын

Could you do a video on a fix for un-even/ sagging floor joists? With no subfloor on top. Perhaps sistering the joists or a different method?

@gregvancom 2 жыл бұрын

I've already made some. Go to our website and click on the crawlspace repairs link. Let me know if you can't find what you're looking for.

@BM-ih1bn Жыл бұрын

I have a small 2 story cabin and the ceiling for the 1st floor is the floor of the second floor. (3/4" T&G flooring) I want to lay a subfloor over this on the 2nd floor and then lay flooring over that. Do I need a subfloor or can I just lay engineered hardwood over the existing T&G?

@gregvancom Жыл бұрын

I would check with the product manufacture to verify, but if not, I've seen it done both ways.

@JuanMartinez-lp1bd 2 жыл бұрын

Do you have any information regarding installing braces, bolts, and earthquake foundation plates to older homes?

@gregvancom 2 жыл бұрын

Not yet, but it's on my list.

@Obtuse94 Жыл бұрын

When doing this, I know the glue and screws will help the new plywood not squeak, but what if the current plank subfloor squeaks badly already?

@gregvancom Жыл бұрын

I've nailed or screwed the planks (existing sheathing) to eliminate squeaks, then installed new subflooring. Installing plywood over 1x6 sheathing can add another layer of possible squeaks if not done correctly or if there are other problems with floor framing.

@michaeldavid2320 2 жыл бұрын

The 1X6s on my floor have some gaps. Would you put down a vapor barrier prior to the plywood? If so, what would you recommend?

@Xonikz 2 жыл бұрын

Housewrap or tarpaper are what the contractors used on the house I'm in

@bobjoatmon1993 2 жыл бұрын

my cousin put down vapor barrier (it breaths but blocks drafts), then 1/2" pink foam THEN 5/8" plywood. According the him, this last winter his house floor felt much warmer and they noticed how much more solid and quieter the floor felt in daily living. Note his house has the 'garage' & storage / utilities on the ground floor and the 'housing' in the second floor so there is air moving under the habitable space at all times.

@gregvancom 2 жыл бұрын

I'm not a fan of vapor barriers between lumber, but have seen it done before and don't know what the results would be. I would worry about moisture being trapped above lower sheathing and rotting the lumber above.

@vivalaleta 2 жыл бұрын

We have a soft, damaged pine floor. We want to install porcelain tile so we have to remove it - right?

@bobjoatmon1993 2 жыл бұрын

I believe that you might check into putting down cement board / panels as a base for the tile.

@vivalaleta 2 жыл бұрын

@@bobjoatmon1993 I'm afraid that will make the floor too high and we'll have trouble with doors.

@gregvancom 2 жыл бұрын

If you can't raise it, then I would imagine it will need to be removed and replaced.

@vivalaleta 2 жыл бұрын

@@gregvancom It's full of pine patches. I can't wait to tear it up. We're doing our own remodeling once there and so watch your videos. Thanks for the education.

@deegee1921 Жыл бұрын

Should i glue the sheets together? Thanks

@gregvancom Жыл бұрын

I like it.

@deegee1921 Жыл бұрын

@@gregvancom thank you for the reply i have been renovating a kitchen with 5/8 cdx subfloor and 3/8 PB on top, i ripped out all the particle board and the 5/8 seems to flexible so im trying to figure out what thickness would be good to stiffen it up. Im 8 months into a full gut job and the floor is the last thing i have to do. Its been a nightmare 😪

@deegee1921 Жыл бұрын

Its gonna have vinyl spc plank floors, no tile. I think im over thinking it, hence the 8 months in lol