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causes of sloping floors

causes of sloping floors

causes of sloping floors

(OP)
I just looked at a first floor in a 60 year old house that is sloping, not toward the foundation walls, like you'd expect if there were settlement, but about mid-span of the joists. Looking at the joists from below, there didn't seem to be any very obvious deflection, but I suppose it might look worse from above than below.

I'm thinking the most probable cause is creep losses and under-sized joists. (They're 2x8's and an 11' span). What do you think? I've seen this once before and was kinda stumped then too.  Thanks.

RE: causes of sloping floors

My house is about 70 years old and one span of joists has a longer span than the others.  There is a noticeable sag in the joists.  Just long term deflection on joists that are a little undersized.

RE: causes of sloping floors

If the put in the joists relatively green and they were loaded, they would develop a memory of the deflection experienced as they dried.

Could also be creep as previously mentioned.   

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: causes of sloping floors

Agree..it's probably creep.  Pull a string line on the joists (or if you're not old school, use a laser line) and you'll quickly see the deflection that you can't discern from just looking.

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