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Old 09-03-2015, 03:30 PM   #1
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leveling subfloor.. how to do it?? (2nd floor)


one of the rooms i'm looking to remove the carpet and lay down flooring for is used to be an porch area (2nd floor) that is now enclosed. What the previous owner did was to simply install plywood over the existing joists and cover it up with carpet. The problem is that the old porch is sloped away from the house and one can really feel the sloping. I'm hoping to turn the room in to a bedroom and don't want any of my guest sleeping on a slope. I'm now left with the task of leveling the sub floor and I'm not sure how to attack it.

my considerations are:

1. left all the plywood and install angled pieces on the joists to level the floor? pros: prob the proper way to fix this. cons: a lot of work to lift the plywood

2. use self leveling mix to even out the floor? (
). pros: easy cons: really concerned about weight and potential long term issues. also I'll need another layer plywood to lay hardwood floors on top making it too thick.


any suggestions on what's the best way to get this resolved?

Last edited by vote4Pedro; 09-03-2015 at 03:34 PM.
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Old 09-03-2015, 03:50 PM   #2
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That depends on the slope. SLC can get pretty pricey in larger areas. Some can go over gravel to cut down on the amount used, though not sure on that over plywood which BTW may need lathe as well depending on the nmanufacturer. If its more than an inch or so at the far end I would be pulling the plywood and sistering the joists to level.
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Old 09-03-2015, 03:51 PM   #3
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Simple, cheap and right----remove the plywood, exposing the floor joists.

Sister in new 2x6 (or 2x8) along side of the old floor joists---installing them level.

Put down new 3/4" subfloor.
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Old 09-03-2015, 07:06 PM   #4
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by sistering the joists. the new piece of 2x6 will be level... right? meaning the old joist and the sister joists won't be perfectly parallel??
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Old 09-03-2015, 07:15 PM   #5
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Quote:
Originally Posted by vote4Pedro View Post
by sistering the joists. the new piece of 2x6 will be level... right? meaning the old joist and the sister joists won't be perfectly parallel??

yes, you got it
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Old 09-03-2015, 07:17 PM   #6
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Hi Pedro,

Quote:
Originally Posted by Pedro
by sistering the joists. the new piece of 2x6 will be level... right?
Yes of course, that's why you're doing this.

Quote:
Originally Posted by Pedro
meaning the old joist and the sister joists won't be perfectly parallel??
No, they will be parallel, cuz the new is attached to the old slopped joists.

Jaz
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Old 09-03-2015, 07:32 PM   #7
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Quote:
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Hi Pedro,

Yes of course, that's why you're doing this.

No, they will be parallel, cuz the new is attached to the old slopped joists.

Jaz

if the new and old joist are parallel then the floor will still be unlevel,
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Old 09-03-2015, 07:38 PM   #8
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think we are saying the same thing jazman. the old joist will be parallel to the new 2x6. However the new 2x4 will not slope meaning that at 1 end, it'll be higher than the old joist.


another question on the new 2x6 is whether i'll need to run it end to end resting on the frame or can it just start 1/3 of the way of the old joist and not rest on anything?
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Old 09-03-2015, 08:22 PM   #9
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Pedro,

How much slope is there in the total run?

May be best to sister the entire length otherwise you may create a small valley.

Jaz
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Old 09-03-2015, 09:02 PM   #10
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probably about 1-2 inches. I can't think of a good method of how to measure how much i need to level at the ends.
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Old 09-04-2015, 06:15 AM   #11
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a string line helps---

I often use a 2x tacked to the wall--sort of a 'height stop' for the new joists--
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Old 09-04-2015, 01:00 PM   #12
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Quote:
Originally Posted by oh'mike View Post
Simple, cheap and right----remove the plywood, exposing the floor joists.

Sister in new 2x6 (or 2x8) along side of the old floor joists---installing them level.

Put down new 3/4" subfloor.
+ 1 And run them the full length .You don't want a spongy edge.
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Old 09-07-2015, 09:43 AM   #13
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I have to revisit this again. after pulled away the carpet, seems like lifting the subfloor is not an option as it's sandwiched under the walls. cutting it would be ALOT of trouble.

I'm considering just laying another subfloor on top to level it. it'll need to be precision work to get it level. another option is to use the self leveling concrete idea.

damn it jim, why can't it be easy. do i have other options?
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Old 09-07-2015, 10:34 AM   #14
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also took some detailed measurements. since it's a porch before, it's sloped not just towards the outside of the house but also to 1 side.

so length wise, i need to go from 3 1/4 inches to 2

and width wide i need to go 2 inches from joist to joist

FAWK....
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Old 09-07-2015, 04:36 PM   #15
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If this was a converted porch and they only covered the roof for a floor.?
I would be concerned if the new acting floor joist is sound enough for your intended purpose.
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