Leveling a Subfloor

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Topic by Olaf Gradin posted 10-07-2008 05:29 PM 4749 views 0 times favorited 3 replies Add to Favorites Watch
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Olaf Gradin

12 posts in 5353 days

10-07-2008 05:29 PM

Topic tags/keywords: subfloor joist sleeper concrete garage level floor

I’m converting half of my two-car garage into a playroom for the family. The garage is built on a sloppy slab that sags several inches through the middle where water is known to collect. I’m having a trench drain cut into the garage’s opening to prevent this inevitable mishap from occurring under the new room, but I’m left with a leveling problem that I need some tips and tricks for.

So far, I’m having pretty good luck with my current plans, it’s just tedious. I am raising the level of the subfloor to match the house – I’ve measured down from the finished ceiling to find a point roughly 8’ down including the eventual subfloor panels. Below this point, I’ve added 2×4 PT boards on-edge on top of sleepers which I’ve secured to the concrete. The 2×4 baseboards had to be tapered in order fit a level line under my 8’ (8’ 3/4”) mark. In adding the joists between these boards, I’m leveling and shimming each one over two sleepers (roughly 41” apart) and the joist caps. This is the tedious part. I seek level from the previous joist, and along the length of the current joist. The first few had to be tapered to fit, though as I get closer to the center of the concrete, I have an additional 2×4 attached to the sleeper. It’s not impossible, but I grow concerned as I move across the floor to the other side of the wall; further away from one reference edge to somehow land on the far sided one. Is there some sort of trick I can use to get all of this leveled up accurately and my joists shimmed quickly?

-- It takes a viking to raze a village.

View Kindlingmaker's profile


17 posts in 5360 days

10-07-2008 08:32 PM

Besides a transit or water level the tight string is great. If you know your ceiling is right on then it would just be a matter of constant measuring from that. I use a simple $10 pocket laser and shhot a beam across everything, works pretty good.

-- What do you mean I can't use a coat hanger for 12 ga wire?

View Kaitlyn's profile


67 posts in 520 days

01-30-2023 06:13 PM

Leveling a subfloor is an important part of any home improvement project. garage door repair fountain valley Not only does it ensure a more even surface for the finished flooring, but it also helps to reduce the likelihood of cracks, bumps, and other issues. Taking the time to properly level a subfloor is an essential step in creating a beautiful and lasting floor.

View cathyA's profile


45 posts in 81 days

05-21-2023 12:25 PM

I’m impressed by your determination and resourcefulness in converting your garage into a playroom. It sounds like you have a good plan in place, although the leveling Peter Veres strength training process can be tedious. One trick you could consider is using a laser level or a water level to ensure accurate leveling across the floor. Additionally, seeking advice from experienced DIYers or consulting with a professional could provide valuable insights and tips to help you achieve your goal efficiently.

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