How to repair or replace a damaged section of subfloor. 

Finally someone that knows how to fix a floor proper, been through a lot of videos, some ignoring the problem and just spray painting, some cutting and replacing with no added support, this guy gets it, he doesn’t want to have to fix it again.

What a great how- to video! Thanks for making it. I had my husband watch this. We have both been putting off such a repair job as that in our home. We bought a home not realizing the damage under the floor covering in front of the kitchen sink. With your video we have a little more confidence going into the unknown. Thank you, thank you, thank you. Excellent job!

This video helped me tremendously! First project on my own, restoring a Layton 1964. Thank you for ur help!!

That is now the strongest part of that mobile home! Good repair.

i woulda personally changed the cruddy insulation or vacuumed out the old rotted bits of flooring for peace of mind, but hey maybe they where on a tight budget.. anyways legit job

Nice job. I just bought a large manufactured home with some compromised particle board subflooring from lack of a vapor barrier in a humid climate. Your video is very helpful and I will be making some boxes! I'll only replace what is needed, then install a vapor barrier and crawlspace fan.

About to rip up old carpet and padding and do exactly what you are doing in this video to repair floor damage, appreciate the step by step information. I'm dreading the job but hopefully this will make things a little easier.

The box idea is great. I would have added blocking but this is easier and adds structure to the repair.

Very clever and practical problem solving, Alexander. Thanks very much for making this video - it helped me A LOT!

Looks like great craftsman, I can see a lot of skill. That will definitely fix and support nicely. I'm looking to support my subfloor so will be bracing only with 2x4 going across, but the way you demonstrated in the video is the ideal way and very efficient.

Thank you for sharing this video, I gained the knowledge I needed in order to not be so intimidated by the repairs I need to do on my recent home purchase.... Thank you very much...

Thank you for posting this vid. Whoever decided my manufactured home needed a furnace vent in the middle of the kitchen floor didn't cook much (it's a crumb catcher). I was worried about edge support for the patch, and your 'box' idea is brilliant. I may put rosin paper between the flooring and patch to ensure they don't squeak.

Nice. These videos stay around long-time. Thank you.

Thanks for the video! I have to repair the floors in the mobile we just inherited. I hadn't thought about boxes!

nice work! I like the box idea, its a strong fix and provides plenty of support for the new floor. will do this on my next project floor.

Good job and great demonstration. I have a soft spot in kitchen and this really showed me what to expect and gave me hope that it's not as bad of a situation as i was thinking. Thank you.

WOW great job im getting ready to do the same thing but directly inside the front door of my single wide i recently purchased, you gave me the purfect video thanks 👍

Ok now I'm feeling A LOT more confident!

Great video. I am a newbie home improver and followed your video step by step, even starting and stopping it as I worked. Thank you so much!!!!!

This is very helpful to me and I'm glad I ran across this and it is going to help with the work that I have to have done so thank you very much for posting this

Outstanding video, the best I've seen so far!!

Thanks for this video, it really helped me. I had to make this repair and I admit it took me most of the day between removing the damage, installing the box, picking up material and laying the plywood. I'm pretty handy but certainly not a pro. I would rate this degree of difficulty a 7 out of 10.

You guys are awesome 👌 👏 😎 after watching your videos 📹 it makes me feel more confident about doing it. I have a bad floor in my bedroom. It's a 1970s single wide trailer. I been needing it done for awhile 😩 now! But I've never layed flooring before. But I feel now I can do it myself!

Thank you for this Video, It helped me so much when fixing my subfloor repairs.

i have a 4 by 4 foot area to replace for carpet install and you really clarified a great deal for me again, thanks

Sweet work! Thanks for sharing your informative video! very helpful!

Very nice, particularly the boxes. Thanks

Excellent job! I would love to learn how to do this for my own RV. Looks fantastic.

Excellent video! Thanks so much. Now I feel very confident that I can do this type of repair myself.

Excellent video, I have just came across this problem and now I will use your solution. keep up the good work!

Great video!!! I'm glad you didn't stop ...

9:42 - 9:43 that was so satisfying to watch lol. Anyway, I have to do this exact thing. Problem is, one side of the plywood is buried underneath the wall 2x. So I'm just going to cut it like you did and build those boxes. Appreciate the vid!

You're amazing!!! Great tips seen other vids, but no one so smart. God bless!

Excellent and straight forward explanation and instruction! Thank You ✌🏼️🐞

Great video Alex. Thank you for sharing your expertise.

Like the video and the work was great. Noticed the same thing on your first box that an additional 2X4 would be helpful for support. Thanks for the help.

Thank you for making this video! This helped me perform a very sturdy repair!!

Thorough with great detail! Just what I needed to see! Thank you

That is all truly beautiful. It requires lots of tools and some years' practice in knowing how to use them correctly. Your floor looks like my trailer. I had full sheets of plywood installed to replace a damaged subfloor and the installers cut vent holes in them for the non-functional 1990 furnace. I didn't want vents. No one listens... I wanted to be able to reinstall the woodstove according to code but now I have plywood with holes covered in loose-laid vinyl with holes and need a custom-made hearth pad to cover the vent hole (and of course still have a horrid hole in the floor six feet away with a register in it to fall over.) It seems the easiest repair is "just" putting in two new sheets of plywood rather than cutting patches and making joins...but not listening to women from the beginning is, I suspect, more fun for the contractor...

good work. nice cuts and good tools.

Thank you. I am replacing carpet and found plywood edges not connected to the floor joists. NOW I know to build a set of boxes for them. Thank you, also, for showing that mistakes happen. ;)

wow wish i could work with you a few times i would learn alot i have a weak spot around my toilet i love what you did making the boxes gave it a solid finish job.

That's was best I saw yet..you make it look so easy!

Loved the idea of the boxes, I will be using them, thank you for sharing

Just bought a termite eaten mobile home. The termites are gone, but the floor needs to come up and the walls off. I want everything new. This video made it easy....going to buy two other homes: one in Costa Rica, one in Rep. de Panama. My termite eaten home was so cheap, I can live there for free and have two other places to live.

nice work mate. I really had a hard time nailing corners once. thanks for sharing

Thank you for this vid. More informative than other videos on this topic. Very helpful.

Thank you so much for sharing this video . Im going to be working on my floors and you made it look simple again thank you

That was awesome!!! Been struggling with 2 holes for 3 days now

Your boxing method is perfect for my situation. Well done video thank you :)

Thank you! The guys who I thought of hiring were only going to replace the plywood, which seemed wrong to me. so glad I saw this video. I'll just do it myself

Excellent video! Congratulations! Now I have good idea how fix my sub-floor. Same damage. Blessings!

Great video! This will help me when I do mine! Thanks!!!

Nice job on the video I personally replace all of the particleboard when I run into a situation like that just in case the floor gets wet again I don’t have to go out there and tear up my new floor just to repair that particleboard again

Awesome love the box its much easier to build back the floor that way. Thank you

nice and tidy and snug, looks great

Good idea, I like the box idea. Nice one mate.

IMO this is the easiest method for a homeowner to patch holes in the floor. Home Depot will rip the subfloor panels if you know your measurements. Patch the floor with the same material depth. It can vary in mobile homes. Take a piece or measure the floor at the heating grate. You can also use deck screws if you don't have a nail gun. Good video and you almost have a million views! Only 88k views to go!

Thanks so much, very informative, easy to follow video.

Good job Alex . Keep the good work.

good job man...very creative..i'm impressed.

I have the same straightedge. Great product, easy to store.

I'm purchasing an 80's 2 bdr mobile home and am going to use this method to fix up a few spots in the floor. Hope mine is as easy as you made it look!

Thanks for making this helpful video, I will be sure to try this out!

That is really smart. I have never seen it done that way.

Love the box idea, thanks.

Wish you could come fix my floor. Great job!

Nice work. Boxes nice have extra support.

Great video, this is almost identical to the spot in my living room that I am about to fix. 👍

Just wondering why you didn’t replace the insulation? It looked nasty and probably was wet at some point?

Thanks man. Exactly what I was looking for.

great video, very detailed and good job. I hate those particle board floors they are just absolute rubbish. I have a job like this coming up of about 450 sq ft of the stuff to replace.

Great clean work. I could do the same thing and it look like a 4 year old did it. Nice work!

awesome! i have been looking on a lot of resources but couldn't find one about how to support the joists. I'm in a mobile home as well and I am in the process of replacing my bathroom subfloor and because of damage had to go to the next joists on both sides in the adjacent rooms.

Your video help me a lot thanks :)

Great work! This helps me a lot!!

Great job and thank you for sharing

I'm 15 and we are going the cheap route on repairing my great grandparents 1974 mobile home so far I've done a lot of the work watching videos like this and doing it like 99.9% right next I'm going to be doing the bathroom under the toilet and bath tub need replacing and dont rly want to do it until I know how to do it right any tips?

thank you, this was REALLY helpful. i was trying to contract this job out - uneven floor and water damage and getting absolute Bullsh*t responses and quotes (like tear out ENTIRE subfloor and shim with roofing tiles.)

Ive got a lot of this to do. Very helpful

What about the out side walls of floor joist are rotten on the ends will the wall have support

Exactly what I needed. Thank you!

Alex your the BOSS!

Huge help! Thanks so much!

Thanks for posting. Now I know what I did wrong cutting corners. Boxing inside between the joists! Then again, my joists were MUCH closer together and I think the plywood I used is much more solid. Anyway, now I know!

thanks for the info, based on the comments of other videos on the same subject, this seems to be the right way...

brilliant with the box inside a box for support!! thanks

THX for replying back AD.........your vid will be helpful when i do this.

I like the extra support you added ! Long term stability 💪🏻

Wow, thanks from KC too. I have an issue in the kitchen. Removed the vinyl tile and have some problems around the cabinet sink. Looks like some sub-floor was replaced but it is still spongy (they did not use the boxes so we might have a support issue. Now I know what must be done, Great video.

Thanks for the video! We were about to put some new carpet down and when I ripped the carpet up I noticed this same kind of water damage that came from the back sliding door! My problem is the previous owners had linolium (spelling???) over the natural wood which is rotted....Do I rip the entire floor out and put a new subfloor or do I replace the damaged area and pour a leveling liquid to bring the floor up to the rest of the floor? Any advice would be greatly apprecieated! Thanks!

That looks awesome. Thanks!

Excellent video. What type of nails or screws would you recommend for hand nailing the 2x4s and new subfloor? My rotted floor is by the back door due to the previous owners attaching exterior steps directly to floor joists with lag bolts. The rain water came straight in. Also, the steps were too high so water also back flowed into the same area. Unbelievable!

awesome, thought there was a ton more to it. thanks I think I might be able to tackle this without expensive contractors, damn old leaky water heater in my mobile home. thanks again

I own a house built in 1956 it has original hardwood floors currently covered by ugly carpet but my subfloor has uneven parts to it the floor joists are good I'm thinking or replacing the entire floor and using this method where the walls are at

Nice job! Thank you!

Thanks for making this video, going to have to make use of it someday soon! Great idea to set the blade to thickness of floor...scared of severing all the wires. :)

Solid work!

I have to do my bathroom floor thanks for show how to I seen many other ways and I like this one 👍👍

Very informative video. I have a double wide in Texas that I have to replace some of the floor in the master bathroom.Water leak damaged the blue treated plywood underneath and mold set in.Not really looking forward to it,as I'm not a carpenter,but we don't have the money to pay someone to do it. I'm expecting to have to use your box method if the floor joists are damaged.Thanks for posting.