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Old 05-28-2017, 06:01 PM   #1
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Raising a floor.....


So about to close on our 1st house and there is a lot to be done to say the least. The 1st thing we are wanting to do is raise the converted garage to bonus room floor to be level with the rest of the house. I've googled and youtubed this subject and only results I've come up with are things covering raising cement tgat has settled over time to floating decks, nothing on what we are trying to do. Anyhelp on tools/building materials even links to actual videos/guides would be great, tyia!
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Old 05-28-2017, 06:05 PM   #2
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Re: Raising a floor.....


I don't really understand your post. How big is the area you want to raise? How far do you want to raise it? Is this part of the garage, or has it been converted to living space? Remember, no one on this forum has ever seen your house, it is impossible to visualize your project without a good description, and some photos.
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Old 05-28-2017, 06:08 PM   #3
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Hmmm, damn good points....cant really get any of the info as i havent really measured the space... it is though about an 8-9 inch drop from the living room floor to the floor needing raised.
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Old 05-28-2017, 06:20 PM   #4
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Re: Raising a floor.....


So can we assume that there was a garage with a concrete floor.....over whichever prior owners put some type of secondary floor? To start with, if it is me I am tearing out enough of the existing to see what is there.....because without knowing that you don't know how to go forward. Maybe they put in some type of raised flooring system?? L. Maybe thy just put ceramic tile over cement....which would result in your floor slimg towards the garage doors because that is what garage floors do. Tear put a piece, see what is there, get back to us. Ron
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Old 05-28-2017, 06:31 PM   #5
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Will do, was watching the walk thru video of the house and it looks like they just put carpet w/the pading over the concrete with no sleeper over the concrete, ill be able to get info/pics on tuesday when i go take door measurements and all, ty for the help so far
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Old 05-28-2017, 06:43 PM   #6
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Re: Raising a floor.....


You should be able to install 2x8 or 2x10 floor joists over the concrete, vapour barrier, insulate and install flooring.
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Old 05-28-2017, 10:54 PM   #7
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Re: Raising a floor.....


Once and you're going to have to look at is the height of the windows above the floor. If they were set to the right height based on the concrete floor the bottom ledge will be very low compared to the new floor in the top of the window may be in a very unusual position. Depending on the construction of the exterior of the home you may want to consider raising the windows as part of the project.

Also, what did they do about the garage door when they did the original conversion?
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Old 05-28-2017, 10:56 PM   #8
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Not sure, original owners from 59 converted it in the 80s, only reason u can tell it was a garage is because of the original blue prints (which btw are hard and expensivve to obtain)
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Old 05-29-2017, 03:15 PM   #9
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I would put some treated 2x4s as sleepers and then decide how far you need to come up to meet with the other floor, and decided what flooring you're going with so you can allow for that
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Old 05-29-2017, 10:58 PM   #10
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Re: Raising a floor.....


Very cool project. It's always fun when you first get your hands on a house to take on things like this.
Converting a garage to livable space is fairly common. Building a new floor isn't that difficult either. There are a couple things to be aware of though...
Garage floors are typically pitched a little bit so that the rainwater that comes off the car will roll out to the garage door side and not the house.
Older garages were rarely insulated under the slab.
Easy fix for both is to raise the floor which is what you want to do anyway to match the other floor. As long as you have the headroom it's not that hard to do.
Put down a layer of thick plastic sheeting and tape any seams if you have to use more than one piece to cover the whole floor. Lap the sheets over each other as much as you can too.
Establish the level line for your floor. A 360 degree laser is great for this but you can also go old school and use a water level.
You'll need to cut your floor joists to taper down and counteract the pitch of the cement floor.
Put some rigid foam insulation in between the floor joists, drop some 3/4 T&G ply or OSB and you're ready to have a new level warm floor instead of leaning on a cold pitched floor.
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