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-   -   house lifiting (http://www.houserepairtalk.com/f32/house-lifiting-12869/)

chefman45887 01-02-2012 11:57 AM

house lifiting
 
Hi,

I am new here for the most part, need input on a house lift. I have gutted the whole house out but the stick framing, no floors just interior walls side walls floor joists. I know the roof , trusses and all will need to be replaced after that said and done the foundation is shot its a crawl and wasnt done correctly. i plan on doing full basement . i have done alot of research on material pricing i have done alot 20 years of diy but house lifting, this is gray to me.


House specs rounded up to foot:

48ft long by 25 ft wide

Questions I have:

1. cribbing I plan on using 4x4 timber with 3 pieces in each row, will this be enough support?

I am running a cribbing pier in each corner 4ft out from corner and 3 more separated equally along the center from left to right of the 24 foot width 4 foot off the sides of the house. 7 total

2. I have seen alot of youtube and diy videos where i see i beam since the house is gutted will i need anything this heavy duty ?

Any other input would be greatly appreciated.


Mike

nealtw 01-02-2012 01:07 PM

4x4s have a bend facter, 6x6s or 8x8s would be better and how many depends on the soil you are lifting on. Each floor joist needs to be supported at both end so yes you need beams to span between jacks. They would be sized to the weight of the house and the length of the span.
The other thing is, without a floor ther is nothing holding the bottom of the house square. Once you lift it, it could twist out of shape really fast.
Most diyer's want to figure this out on there own but the pros would bring in an engineer.

chefman45887 01-02-2012 01:26 PM

Lifting on some hard yellow clay here ill go with the 6x6 , so the new 3/4" subfloor should be put in before a lift ? will get that figured in as well. i beams wont be bad just a matter of getting them in. since the house is 48ft long so go 52ft on some 6-8 inch i-beam for over hang.

nealtw 01-02-2012 02:38 PM

I would think 40 ft on an 8" beam would be way to long of a span, that may need one or two more jacks. For that kind of span you would need more like a 14" beam.
If you are just lifting the house to dig out for a new foundation is one thing but you are planning to raise it for a higher basement, I would call a house mover.

chefman45887 01-02-2012 02:51 PM

well not only for a 8 ft basement but the grade of the middle of the road is level with my seal/sill plate on house. the lift from where it is now with the old to finish is only 2 1/2 feet.

i was thinking to use 2 8 inch i beams one on one side one on other and in line with 6 jacks total , could always run of sets of cribbing on each side then 2 in the middle you can never have too much support.

nealtw 01-02-2012 03:22 PM

I think 12 jacks min.
Let's get this right, you are going to run around from jack to jack trying to keep the house within 1/2" of level stopping two or three times to re-crib the jacks and all the time watching the cribbing isn't sinking into the ground. And what's the back up plan if one or two sink? If it sounds like I am trying to scare you out of this, I am.
We need other opinions here.

chefman45887 01-02-2012 03:39 PM

oh not in the least looking at a crew of 6-8 people the crawl space in some spots has 6 foot already taken out by previous owner the very front of house has maybe 4 inches of clearance from bottom of floor joist . i already own 10-40 ton hydraulic jacks ,the house weight no more than 40 ton total i have 4000 ton of jack if i run 2 8 inch eye beam and 2 jack in the middle with cribbage all around in 6x6 should be plenty enough. i have had ground engineer come out and do soil test and i should be fine the crappy crawl space foundation with 0 zero footer house was built in 40's is holding the house up as scary as that sounds with little movement and the surprising thing is the floor joists are all level.

nealtw 01-02-2012 09:22 PM

Well that's up to you but I wouldn't do it. I really think you want the floor in first and lots of cross bracing in the house so it is as ridged as possible. You don't need it coming down like a house of cards.

chefman45887 01-03-2012 07:40 AM

i couldnt agree more i will take your words to heed to see what the house mover can quote me and have a structural engineer come in before the house lifter that way when i have everything braced i have someone checking to make sure the house of cards doesnt come down.

nealtw 01-03-2012 10:20 AM

Keep us posted on how it's going.


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