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Acceptable Floor Slope?

sslater's picture

I am replacing 4-5 floor joists in a 100+ year old house due to years of plumbing cutouts which have caused sagging. Unfortunately, other joist have also sagged slightly but not enough to require repalcement, therefore there will be at least a 1/4 floor slope over 5 feet in the rebuilt floor. Is this acceptable?

Above the new joists I will be adding 1/2 in subfloor, 1/2 plywood, concrete board and tile.

 Thank you

(post #56588, reply #1 of 6)

If they are sagging before you put down cement board and tile, chances are they are only going to sag more. Some slab foundations hump and sag more than a quarter inch i 5 feet.

(post #56588, reply #2 of 6)

1/16" per foot is not bad at all but it might be good to double sister a few of rthem for that addedd weight


Excellence is its own reward!



Oh Well,

We did the best we could...

(post #56588, reply #3 of 6)

Enjoy it!  Lots of people have those boring flat floors........  :)

Any jackass can kick down a barn, but it takes a carpenter to build one.

"Doubt is not a pleasant condition, but certainty is absurd."

~ Voltaire

(post #56588, reply #4 of 6)

Without knowing span and joist depth it's hard to advise but when you bed your cementboard screed your thinset to compensate for uneveness then nail down board with HD roofers.

(post #56588, reply #5 of 6)

1/16inch? Roar!

Reminds me of a friend's old colonial in New England. An added on upstairs bath decades ago has some serious slope to the floor. I told him you never really know what the problem is until you remove some flooring to see but figured probably someone back when notched the joists for plumbing. He decided to leave it be for now.

You stand there to take a leak and the water level is 2 inches to one side of the hole and 3 inches on the other. Take a dump and you'll pull your back muscles trying to stay level.





(post #56588, reply #6 of 6)

Thanks to all for your input