Question about replacing two 1×12” subfloor planks
D.shimmel
| Posted in Construction Techniques on
Hello All,
I need to replace two 1×12” subfloor planks, however Douglas fur and yellow pine aren’t available locally. Is it feasible to use “whitewood” or rip down plywood instead.
I do plan on adding another layer of subfloor to build it up to the rest of the house if that makes a difference.
link to a picture of the subfloor. https://www.reddit.com/r/Flooring/s/P5DOKA0cEg
Thanks,
Destin
Replies
So you can either find one by 12 online and order it, I would not recommend using three-quarter inch plywood only because if you use a different kind of material to replace the floor with, you're going to have to block all the edges of the two replaced planks. The reason for this is, it removes the tongue and groove on the one by 12s which will result in a weak spot in the floor potentially. The most conservative approach to this would be to get to appropriate one by 12 boards, pull out the two old boards without damaging the existing boards next to it, replace one board by inserting the board back into the tongue and groove on one side, and provide blocking at the ends of the plank where it will now need it because it is not going all the way underneath the wall to the outside of the building. Then before you put the second plank in rip off the either tongue or groove side so that it will allow you to insert the planes in and then on the tongue or groove that you ripped off you need to block with say two by fours fixed properly, all the way along its tongue and groove missing edge. If you use a non-tongue and groove board that is not compatible, you will need to block both edges of the new material if it will not have any tongue and groove to interconnect itself with.
That doesn't look like T&G subfloor to me. Look at the gaps. Also, it's all face nailed. I would think T&G would have one nail through the tongue, but maybe not.
I should also mention that the above is the proper way to replace the floor planks, but if you're going to go over the top of the floor with say, three-quarter inch subfloor, then you don't need to replace the two planks at all because the new plywood will bridge over that spot if it's a damaged. Without knowing more details, I can't say exactly how one would need to go about it, but that should be a good start.
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You can use ¾" plywood, even though it's a hair under ¾" thick. If you're adding another layer on top, how thick? If it's ¾, no problem. If it's ¼ -½, consider skimming the replaced plywood with something to account for the slightly undersized thickness.
Obviously add blocking for the replacement plywood as necessary.
Thanks all for the reply. followed your suggestions, overlaying it with a 19/32 subfloor. Secured it with glue and construction screws, ensuring they're 12 inches apart, avoiding the joists, and placing screws at the center of the squares formed by the others.
You didn't need to avoid the joists with the screws but you'll be fine with the grab of the screws into the existing 1x12's. The squares thing is fine, you could have just screwed the edges at 6 or 12" oc and the field at 12" oc.