Forum Title: 1 inch underlayment? Too heavy, need help!
New member here hoping for some advice. I am renovating my house and the floors throughout the 2 stories are sagging (its an old house so its normal, nothing structurally wrong). In the middle of the house is the kitchen, going from the back of the kitchen to the front of the kitchen, the floor slopes an inch and three quarters! Most of the dip happens within a 5 foot distance right by the back wall. I need to do something with the floor, either vinyl tile, laminate or vinyl sheets BUT I would like to fix the slope a bit before I put a new floor on it. Here are some ideas: - Half inch cork underlayment - only will give a half inch but its light weight. Run it until it is almost even with the higher end of the floor and then smooth out the connecting area with self leveling compound - 1 inch plywood - will give a whole 1 inch, making the floor offset by only 1/2 to 3/4 inch BUT its going to be HEAVY. The area that needs covering is about 12' by 12'. That's a lot of weight, no? Again, use self leveling compound to smooth out the area where the new plywood evens out with the higher original end of the floor. Both of these will give me a nice hard base for vinyl or laminate. Are there any other solutions...light weight solutions? Any better ideas? Suggestions? Jacking up the floors or shimming, sistering joints is out the question. Thanks! BTW...floor that is there now is vinyl tiles. I plan on leaving them on and doing something over the existing floor.
Category: Flooring Post By: YVONNE CURTIS (Coeur d'Alene, ID), 03/13/2019

If it were mine I'd seriously look at getting estimates for jacking up the house. I think SLC is going to be heavier than plywood.

- SHANNON BURKE (Roswell, GA), 04/06/2019

1 3/4 sag is a structural concern and not normal. The correct way is to sister the joists and confirm your foundation is sound. Since you advise this is out of the question, I would recommend pulling your sub floor, shimming until level, and reattaching (glue and screwing) when the floor is level. The problem with this is the fact that if you are into the floor, you might as well sister the joists. Self leveling compound is very heavy so I would avoid using anywhere except the first floor.

- TARA LOWE (Bell Gardens, CA), 05/17/2019

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