sistering floor joists

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headscratcher
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Joined: Wed Sep 05, 2018 2:53 pm

sistering floor joists

Post by headscratcher » Wed Sep 05, 2018 2:55 pm

Thank you for using the internet to help others help themselves to ultimately do
something worthwhile. My two story house has some floor joists that were
likely installed crown down and after 20 years my doors are difficult to
open on the main and upper levels and there are cracks at wall/ceiling
joints. I've heard that I could jack and sister floor joists to correct the
problem. I'm somewhat handy with tools, I've built a couple of decent
sheds, but I'm not experienced jacking up a house. Also, I'll have to pull electrical wires before introducing new joists for sistering. And then
I'll have to reinstall the same wires in their original positions. I know
that jacking up a house needs to be done at about one eighth of an inch per
day and I have a couple 12 ton jacks, couple jack posts, and I believe that
I'll have to support the jacks on a network of six by six wood posts to
spread out the weight of the house so that I don't punch a hole in the
poured concrete floor. I've done some research yet I'm still nervous but
I'd like to do the job. Your videos are extremely helpful and well made.
Any chance that you could cover this subject or advise of a good video out
there in you tube land?


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Shannon
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Re: sistering floor joists

Post by Shannon » Thu Sep 06, 2018 7:02 am

I have no video for this but you can use your jack posts sitting on a 2x10 or 2x12 and use a made up beam on the posts or a 6x6 on the post. Place the posts with beam perpendicular to the joist and maybe about 4' - 6' apart . as you suggested you can jack maybe 1/8 -1/4 a day.
How much are the joists needing to be jacked?
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headscratcher
Posts: 2
Joined: Wed Sep 05, 2018 2:53 pm

Re: sistering floor joists

Post by headscratcher » Thu Sep 06, 2018 8:40 am

I'm needing to jack up the floor about one inch to 1 and a half inches.

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Shannon
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Re: sistering floor joists

Post by Shannon » Thu Sep 06, 2018 9:21 pm

You will never get that much without lifting the ends with it.

To get that straight you have much more work ahead of you and you may even want to hire it out or leave it as is. I would recommend leaving it and cutting the doors to fit better.
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