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#1
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Raising/Levelling a floor on cement
I am planning on raising a floor a floor on a current cement floor in a
small room (100 sq.ft). This was a porch at some point and the cement floor has a pitch away from the house, so I plan on leveling the floor at the same time. Assuming my plan makes sense, I would run the furring strips away from the house, one end would be about 1/2" thick and the other end, thick enought to achieve a level floor (I predict no more than about 1" 1/2. Each strip would be gun nailed in the cement every 16" or so and plywood (1/2" thick) would be screwed on top to receive whatever finish is decided (carpet or laminate). My plan is to start by snapping a line around the room showing the height of the level floor and measuring the thickness of each strip from there. I'm looking for general opinions on the project and tips to get it done right? How wide a piece of wood should be used to support the plywood floor? What's the best way to cut each piece on a angle on the full length of the piece (about 8')? Any other gotchas or specifics I should be worried/concerned/carfull with? |
#2
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Raising/Levelling a floor on cement
According to charlesg :
I am planning on raising a floor a floor on a current cement floor in a small room (100 sq.ft). This was a porch at some point and the cement floor has a pitch away from the house, so I plan on leveling the floor at the same time. Assuming my plan makes sense, I would run the furring strips away from the house, one end would be about 1/2" thick and the other end, thick enought to achieve a level floor (I predict no more than about 1" 1/2. Each strip would be gun nailed in the cement every 16" or so and plywood (1/2" thick) would be screwed on top to receive whatever finish is decided (carpet or laminate). 1/2" ply isn't good enough for 16" OC, and probably not good enough for 12". Think 5/8" or better still, 3/4". My plan is to start by snapping a line around the room showing the height of the level floor and measuring the thickness of each strip from there. This is a good time to rent a laser level. I'm looking for general opinions on the project and tips to get it done right? How wide a piece of wood should be used to support the plywood floor? What's the best way to cut each piece on a angle on the full length of the piece (about 8')? You'd need to make a taper jig for a table saw to come close to getting reasonable tapers. Tapering jigs 8' long are a PITA to handle. Besides, assuming the floor isn't uniformly sloped, it'll "telegraph" the unevenness. Scribing, then jig or bandsawing each sleeper to make dead certain it was level would be a serious PITA. You should consider a self-levelling flooring compound. At 1 1/2" at one end, that could mean a heck of a lot of it. But, if it's feasible, it's by far the easiest. Any other gotchas or specifics I should be worried/concerned/carfull with? You're going to have to assess the need for vapor barrier. -- Chris Lewis, Una confibula non set est It's not just anyone who gets a Starship Cruiser class named after them. |
#3
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Raising/Levelling a floor on cement
Chris Lewis wrote:
1/2" ply isn't good enough for 16" OC, and probably not good enough for 12". Think 5/8" or better still, 3/4". Or tongue & groove OSB subfloor? Charlesg wrote: My plan is to start by snapping a line around the room showing the height of the level floor and measuring the thickness of each strip from there. Use a string level to mark your corners, then snap the line (or use a laser level as suggested by Chris Lewis) What's the best way to cut each piece on a angle on the full length of the piece (about 8')? You could cut the pieces straight and use shims to make it level, however you'll need a lot of shim material and it'll have to be placed under every nail/fastener. Ditto the comment about a possible need for vapor barrier. In addition, depending on climate, what about insulating? |
#4
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Raising/Levelling a floor on cement
"charlesg" wrote in message oups.com... I am planning on raising a floor a floor on a current cement floor in a small room (100 sq.ft). This was a porch at some point and the cement floor has a pitch away from the house, so I plan on leveling the floor at the same time. Assuming my plan makes sense, I would run the furring strips away from the house, one end would be about 1/2" thick and the other end, thick enought to achieve a level floor (I predict no more than about 1" 1/2. Each strip would be gun nailed in the cement every 16" or so and plywood (1/2" thick) would be screwed on top to receive whatever finish is decided (carpet or laminate). My plan is to start by snapping a line around the room showing the height of the level floor and measuring the thickness of each strip from there. I'm looking for general opinions on the project and tips to get it done right? How wide a piece of wood should be used to support the plywood floor? What's the best way to cut each piece on a angle on the full length of the piece (about 8')? Any other gotchas or specifics I should be worried/concerned/carfull with? I believe you will experience difficulty in "shooting" than many nails in something that is not much more than a furring strip. I just removed a floor that was 3/4 ply with 16" OC structure. It was way to springy for the tile I am installing. Why does an exterior floor have to be level? |
#5
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Raising/Levelling a floor on cement
"charlesg" wrote in message oups.com... I am planning on raising a floor a floor on a current cement floor in a small room (100 sq.ft). This was a porch at some point and the cement floor has a pitch away from the house, so I plan on leveling the floor at the same time. Assuming my plan makes sense, I would run the furring strips away from the house, one end would be about 1/2" thick and the other end, thick enought to achieve a level floor (I predict no more than about 1" 1/2. Each strip would be gun nailed in the cement every 16" or so and plywood (1/2" thick) would be screwed on top to receive whatever finish is decided (carpet or laminate). My plan is to start by snapping a line around the room showing the height of the level floor and measuring the thickness of each strip from there. I'm looking for general opinions on the project and tips to get it done right? How wide a piece of wood should be used to support the plywood floor? What's the best way to cut each piece on a angle on the full length of the piece (about 8')? Any other gotchas or specifics I should be worried/concerned/carfull with? Why not run the furring strips parallel to the house wall on 16" centers. Then you would not have to taper anything. If you felt the slope were too much for square furring strips, it would be easier to cut a bevel along the length on a table saw than a taper that long. The flooring would obvoiusly run perpendicular to the furring strips. 2x4 material cut to size would probably be most economical If the slope is less than 1" for 10' then concrete leveling compound might be easier. For 100sf and 1" slope you would need only about 4-5 bags and something to build a form on the low end. Might even cost less than lumber and fastners, never mind less labor. |
#6
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Raising/Levelling a floor on cement
"charlesg" wrote in message oups.com... I am planning on raising a floor a floor on a current cement floor in a small room (100 sq.ft). This was a porch at some point and the cement floor has a pitch away from the house, so I plan on leveling the floor at the same time. Assuming my plan makes sense, I would run the furring strips away from the house, one end would be about 1/2" thick and the other end, thick enought to achieve a level floor (I predict no more than about 1" 1/2. Each strip would be gun nailed in the cement every 16" or so and plywood (1/2" thick) would be screwed on top to receive whatever finish is decided (carpet or laminate). My plan is to start by snapping a line around the room showing the height of the level floor and measuring the thickness of each strip from there. I'm looking for general opinions on the project and tips to get it done right? How wide a piece of wood should be used to support the plywood floor? What's the best way to cut each piece on a angle on the full length of the piece (about 8')? Any other gotchas or specifics I should be worried/concerned/carfull with? Is the floor exterior? If so, you may want to retain the slope. If not, I'd consider using a levelling compound. Otherwise, I'd probably bandsaw them into the taper. Cheers, cc |
#7
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Raising/Levelling a floor on cement
I would guess that this slab was once open to the weather, but is now
enclosed. bill "SQLit" wrote in message ... Why does an exterior floor have to be level? |
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