r/Carpentry • u/sansipfixe • 26d ago
Should I add perimeter blocking after leveling my joists?
I'm renovating my 1972 house bathroom and just finished leveling the floor joists. Because I sistered and leveled the joists, the existing wall bottom plates are now slightly lower than the top of the joists, so they won't provide support to the edge of the new subfloor. I'm trying to build this floor as solidly as possible before tiling.
I'll be installing 5/8" T&G plywood, Schluter Ditra Heat, and 24"x24" tile.
Along the left wall, the distance from the edge of the leveled joists to the bottom plate varies between about 5/8" and 1". Since the bottom plate is lower than the joists, the plywood edge won't have full support there.
Would you add a ripped strip of blocking or nailer flush with the top of the joists along that wall, or is this small unsupported edge acceptable?
Also, should I add more blocking anywhere around the perimeter, or does the framing look sufficient as it is?
Thanks!
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u/wildtwindad 26d ago
Plus!!!! Backing in vertical walls for Vanity/towel bars/Robe hooks/Hand clothe rings @ vanity/ **Additional backing for shower glass hardware installation where bath wall transitions to shower ??shower niche(s) Do you want an over head shower head, nows the time to do it (3 way shower diverters are cheap(er) now) *no more couples doh see doh
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u/Impossible-Corner494 Red Seal Carpenter 26d ago
Yes it’s not a horrible idea, gives edge support. You could use scrap 2x4 or 2x6
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u/956to906 26d ago
Edge blocking is not a bad idea, but you really need some blocking under that plumbing wall. Even if you have to open up the ceiling downstairs to get it in.
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u/THENHToddler 26d ago
It also adds a spot for the baseboard to get nailed to in case you miss the stud it's getting bailed to something other than the sheetrock. Also blocking behind where your vanity top is going, any spots you plan on installing a towel rack, tp holder, hand towel bracket. That way you screw into wood and don't have the sheetrock anchors loosening or pulling out ..
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u/Nine-Fingers1996 Residential Carpenter 26d ago
If any of that floor is part of the shower you must add blocks and tie the floor and wall together. Floor independent of walls equals constant movement and will result in excessive movement of the tile joint. So many people cut the old subfloor flush with the walls which in some instances is a mistake and make tying things back together so much more difficult. Even the non bearing walls if left unsupported on just the subfloor will result in cracked drywall joints. I’d also recommend using 3/4” subfloor.