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  1. #1
    Join Date
    Mar 2010
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    Default 12 inch drop over 2 inches

    I just bought a 1925 house. I have a small living room that bows in the middle. From the middle to the far wall the floor drops 1.5 to 2 inches over 12 feet. Anyone ever had to correct this much of a slope? I don't want to use self leveling compound for this since it seems like that would be a lot of weight and a lot of mess. I'm considering using roofing shingles (which i've been recommended elsewhere) or pulling up the tounge and groove and putting down plywood with some shims underneath on the joists. Lastly i could try to jack the house up underneath but i think that might be getting outside my skill level. So if anyone has had any experiance with this kind of a slope i'd appreciate some input.

    Thanks much,

    Also i'm pretty positive the reason i have the slope is because my foundation has settled, i have an unfinished basement so its easy for me to get down there and look around. My house is an L shaped bungalow, so the living room is the short part of the L and the far end is the area that has sloped.
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    Last edited by DIY1925; 02-08-2011 at 01:48 PM.

  2. #2
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    Default Re: 12 inch drop over 2 inches

    howdy if the bow is in the middle of the room then i would install a beam under the bow and install two basement jacks and jack up the beam until the bow is not bowing. The floor joists run perpendicular to the beam and the beam say an 8" by 8" by 8' with each basement jack set 1 foot in from the end of the beam. The jacks have a screw plate that you turn out to jack up the beam and each post/ jack supports 15,000lbs. When jacking the floor up consider only raising it two thread s of additional pressure per day so you allow the structure to adapt without causing some finish cracking...

  3. #3
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    Default Re: 12 inch drop over 2 inches

    Howdy re read you post and i think you are saying that the floor has settled about 2 inches to the outside wall. There can be several reasons and a few repairs. First go look ans see if the wood sole plate that sits on top of the foundation looks good or if it rotted and or deteriorated. Then is there cracking in the foundation wall ? what type of foundation? Do the floor joists run parallel or perpendicular to the foundation wall at the low side of the floor?

  4. #4
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    Mar 2010
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    Default Re: 12 inch drop over 2 inches

    Hey thanks for response, here are a couple more details and a picture! I've checked around the sill before and its not rotten. The foundation just slopes down (i've attached a picture, much easier than describing). The foundation is a concrete slab i believe. As you can see in the photo the floor joists run parallel with the sunken wall. Also as you can see in the photo i have an old coal bed under this part of the house (which i'm guessing is why the floor is kind of slopped since its a lot of extra weight) The second photo is from the same angle upstairs in my living room.




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    Last edited by DIY1925; 02-08-2011 at 01:48 PM.

  5. #5
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    Default Re: 12 inch drop over 2 inches

    Howdy, the photos help. it appears you have osb used as a shear wall on top of the foundation. On the other side of the osb is this more crawl space or basement or the outside of the home? If the other side is inside the house then go around and see if the knee wall -short stud wall is open to view and take a photo . If not then first remove the OSB to expose the knee wall of studs and inspect it. The knee wall is a short stud wall that holds up the floor joist. Take another photo with the osb removed ( chip board- cheap version of plywood- trying to make it less confusing) an post it. If there is a knee wall behind the osb one can install basement steel pole screw jacks and lift up then block between the wall plate and the stud wall.

  6. #6
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    Mar 2010
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    Default Re: 12 inch drop over 2 inches

    Thanks again for the response. The other side of the wall is the outside of the house. I'm not familiar with the term OSB but i looked it up and i think i just have regular particle board in place there (i think it was just put there to hold in the batt insulation). I'll tear the boards down from the corner and take a pic of the knee wall either tonight or tommrow to post up. Thanks!
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    Last edited by DIY1925; 02-08-2011 at 01:49 PM.

  7. #7
    Join Date
    Aug 2007
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    6,617

    Default Re: 12 inch drop over 2 inches

    Quote Originally Posted by DIY1925 View Post
    Thanks again for the response. The other side of the wall is the outside of the house. I'm not familiar with the term OSB but i looked it up and i think i just have regular particle board in place there (i think it was just put there to hold in the batt insulation). I'll tear the boards down from the corner and take a pic of the knee wall either tonight or tommrow to post up. Thanks!
    OSB = Oriented Strand Board, aka wafer board. It is a cheap alternative to plywood.

    If the OSB is only holding the insulation in place, the it's not going to be nailed with any great number of fasteners. If it is part of a shear wall, then it will be nailed at least every 6" around the perimeter and 6" to 8" along intermediate studs.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  8. #8
    Join Date
    Mar 2010
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    3

    Default Re: 12 inch drop over 2 inches

    Quote Originally Posted by DIY1925 View Post
    I just bought a 1925 house. I have a small living room that bows in the middle. From the middle to the far wall the floor drops 1.5 to 2 inches over 12 feet. Anyone ever had to correct this much of a slope? I don't want to use self leveling compound for this since it seems like that would be a lot of weight and a lot of mess. I'm considering using roofing shingles (which i've been recommended elsewhere) or pulling up the tounge and groove and putting down plywood with some shims underneath on the joists. Lastly i could try to jack the house up underneath but i think that might be getting outside my skill level. So if anyone has had any experiance with this kind of a slope i'd appreciate some input.

    Thanks much,

    Also i'm pretty positive the reason i have the slope is because my foundation has settled, i have an unfinished basement so its easy for me to get down there and look around. My house is an L shaped bungalow, so the living room is the short part of the L and the far end is the area that has sloped.
    You will need to reduce the settlement to less than l/240 ie 12x12/240 for it not to be noticable. if you decide jack which is what I would do use large blocking on top or you will crush the spruce where you attempt to jack the floor. Also be prepared for some othe problems ie doors and windows have adjusted to the settlement and may be jammed after the repair.

  9. #9
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    Default Re: 12 inch drop over 2 inches

    Howdy, look up between the metal duct and the outside wall at the floor joists are they notched and only part of the joist sitting on top of the wall plate? Or is the entire floor joist sitting on the wall top plate( top plate the horizontal 2 by on top of the knee wall studs)? In your photo the arrow points to the back wall as the sloping down direction if this is true remove the sheer wall to reveal the knee wall there too. Check for level- the cement foundation that the knee wall sits on and the the top plate of the knee wall. in both directions from the corner use a 4' or longer level then write back...

  10. #10
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    Default Re: 12 inch drop over 2 inches

    Howdy again the photos really help now. Looking at them the cement foundation was not poured level and thus everything above it reflects it. So depending on how handy you are one can jack up the top plate of the knee wall and take most of the settlement out of the floor. First remove more of the osb on the wall that is still covered so we can see how the top plate looks. Measure the length of the studs in the knee wall so if you later buy the screw pole basement jacks you will know what size you need. Is the grade of the dirt out side of this corner 6" below the wood on the foundation? It is important that the soils do not touch these framing members on the foundation. Does the yard slope away from this corner? Still need to know how those floor joists are installed at the knee wall too.

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