๐ŸŒŸ How To Replace Subfloor In A Old House @co-know-proconstructiontips



In this video we go over how to repair old, damaged, wood subfloors. Watch us repair termite damage and splice together the subfloor from an old addition (that was improperly added on to the existing structure), to the existing structure’s subfloor. We use 1 x 6 x 10 ft. Doug Fir planks, a skill saw, a chop saw, a speed square, and a framing nail gun with 6D ring shank galvanized nails.

By Co-Know-Pro (@co-know-proconstructiontips )

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27 thoughts on “๐ŸŒŸ How To Replace Subfloor In A Old House @co-know-proconstructiontips”

  1. Thank you all so much for posting this video. I have a similar project where the addition is lower than the kitchen. The subfloor is tongue and groove heart pine flooring. I wanted to match up the height and continue with kiln dried tongue and groove. Could I face nail them like you did in the video? Or should I nail it like regular hardwood floors? Thanks!

  2. i have a bath that has similar issues but a hodge podge of half assed repairs wish I could uploaded photos. Bath is 7×8. There was a water leak near toilet. When I pulled up the 12×12 tile and hardiebacker, I discovered 1×3 tounge and groove that had a hole cut through the floor and sub floor 2 circles and a square it dawned on me this was old bath configuration and it was for waterlines and drain. The 1×3 had dry rot near tub and sink area the dry rot went through to sub floor. In taking out the 1/3 I discovered shoddy repairs to the 1×8 redwood planks. This is a 1937 California Shotgun Bungalow. There are cut offs of the planks with planks just hanging in the wind. Plywood patches . Multi Questions
    1. Do I need to take out the tub? ( to do this right)
    2. Historical lumber behaves differently that new lumber and is dimentionally different (true 1×8) how do you address.?
    3. I took out ceramic tile and backer board, going to take out 1×3's for sure. I was planning on taking out 1×8 but now I am considering this . If I go with first option I am losing approx 2.75" and coming back with 3/4 in plywood, ditra and 6×24 ceramic tile This leaves me with a significant height difference transition to the rest of the house. How do I address the historic lumber issue? (if I go that way)
    4. The adjacent bedroom has a floor that needs to be replaced as well . This has an addition seam. which needs to be addressed the plan was to rip out the 1/3 and see what we got I am not anticipating the dryrot issue we have in the bath with the plank but the seam is the other issue. I am putting in 5/8 strand woven bamboo also unforgiving, I need this floor to be stable and address the seam. Suggestions ? Also how do I address continuity of height levels and make a stable substraight to put down this new floor.

  3. Man you guys responded to every question in here, thanks for the feedback you are providing to everyone here, free of charge. That's kind of you. I got a 1950s house I'm gonna be replacing some rotted plank subfloor in the bathroom from water damage. Problem is, the damage goes underneath the walls. I have my work cut out for me. This video helps and is a good start. Thanks for y'all's time.

  4. Any reason, besides cost/time, not to just remove it all and add 3/4" "standard" Subfloor. I would think any current OSB subfloor would probably be stiffer than DF planks.

  5. Let those poor dead carpenters rest in peace, man! Lol. ๐Ÿ˜‚. We get it. They didn't do it right. Dying… Lol. However I can tell you're gonna do a job right if you're gonna do it because doing otherwise seems like you would be disturbed! I can tell you were raised old school! โค

  6. My house is 80 years old kitchen has the same wood planks in video question the middle of floor is way high seems like 1/4 maybe more higher I went to basement to see if beam was pushing up it was the opposite I have the 1/4 between subfloor and beam now I tried to place a few screws to pull the beam and put the subfloor down but didnt work can sand it down the high spots and put think 12 mm lament down on top or do I need to add a subfloor still on top of subfloor ?
    Omg

  7. So Happy I came across this. Weโ€™re currently facing a similar situation and are DIY ing to save cost.
    Questions: is it ideally best to replace the whole subfloor or are only replacing damaged planks good enough ?
    How durable are these planks ?
    Lastly , can I use a hammer n nails or is a nail gun recommended ?
    Thanks

  8. I found out I had a similar subfloor in my house. I just removed the old carpet and there is old soft wood flooring above my subfloor which is just like the one youโ€™re working on. The wood planking above the subfloor has gaps and squeaks a lot, Iโ€™m wondering if I should remove that planking down to the sub floor which is in great shape? Iโ€™m installing some vinyl plank flooring in both my living rooms and hallway. I donโ€™t know if I can get rid of all the squeaking floor above the sub floor without removing it. What would you do? Thank you!!

  9. THANK YOU!!! Everyone just wants to rip out or just patch with plywood. Iโ€™m trying to convince my partner this is the best way to repair our floor but I donโ€™t know what kind of wood to buy!! Please help! At Home Depot it looks like the 1×6 3/4โ€ is designed for wall usage not floor. SOS

  10. That is an awesome job . I have the same kind of floor I want to lay 3/4 plywood on top to make a sturdy floor " how should I screwed all through the joist or is there a different way?I am a little confused, if you can explained that that would be great. Thank you

  11. Fuck yall did an outstanding job. I dont believe the majority of contractors will take every step to make sure its as robust as it can be as a retrofit. I never really see anyone stagger the joints. but thats vital for longevity as the whole point of the floor system is to dicipate and pread out the load. I have to do this at my house. But im wondering for the small bit of termite damage like that do I have to get a whole house remediation or am I good to just replace it? Ive seen termites in the past but nothing in the past year or so.

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