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Gravel Used Under Concrete Slab. In some cases a base layer is placed on top of the subbase. I could put gravel in say 2 and 35 of concrete over that or just full 55 of crete or I could do lot of gravel and a 2 top coat over that with a bunch of steel and fibers. Ideally 6 inches of crushed stone or gravel should be used for most driveways. Discussion Starter 6 May 9 2011.
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All good concrete needs the bottom almost as flat as the top creating a uniform thickness to maximize strength. The problem is the crush and run - or crusher run as Ive heard it called - is compact-able - and 57 stone - gravel - naturally is compacted when its dumpedspread. You will need 3 inches of gravel under a concrete slab that is 4 inches thick. The soil has to be prepped first before the gravel can be laid down. Layer of compacted gravel under the new concrete. More gravel is better but 3 inches is the minimum amount of gravel you should have with a 4 slab.
For structural purposes gravel or limestone aggregate may be used to improve the bearing ability of the subgrade.
More gravel is better but 3 inches is the minimum amount of gravel you should have with a 4 slab. You can check if you live in one of these zones on the IECC zone map. You will need 3 inches of gravel under a concrete slab that is 4 inches thick. The last thing you want your customers to envision when thinking of a concrete floor is a damp cold basement slab. What kind of gravel do you use under concrete. Whether you pour concrete for a walkway or patio a strong gravel base is required to prevent the concrete from cracking and shifting.
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What kind of gravel do you use under concrete. Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Just scrape off the sod and topsoil and add gravel fill if needed. Ideally 6 inches of crushed stone or gravel should be used for most driveways. The problem is the crush and run - or crusher run as Ive heard it called - is compact-able - and 57 stone - gravel - naturally is compacted when its dumpedspread.
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Since posting Ive chatted with an engineer friend who said 4 concrete is plenty. It doesnt matter if its clay soil or dirt as long as you have an appropriate layer under the concrete. Similarly if there are roots or plants under your slab they may rot and cause unevenness. I dont know the science behind it but Ive only seen gravel used once and that was on military ammunition bunkers in Arkansas. First off the gravel base should be around 10cm 4 inches deep and 10cm more for the slabs themselves.
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If you have clay or loam soil you should remove enough to allow a 6- to 8-in. More gravel is better but 3 inches is the minimum amount of gravel you should have with a 4 slab. The last thing you want your customers to envision when thinking of a concrete floor is a damp cold basement slab. Its about 375 cu yards of crete or like 400 It will cost 100 for gravel to fill in 2 but my crete is still only a little cheaper and it will be a thinner slab. For structural purposes gravel or limestone aggregate may be used to improve the bearing ability of the subgrade.
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Since posting Ive chatted with an engineer friend who said 4 concrete is plenty. One of the reasons those old basement floors were like that was because they had no vapor barrier beneath them leaving an easy path for water vapor from the soil to migrate into the slab assuring that the cold clammy damp feeling never went away. Just scrape off the sod and topsoil and add gravel fill if needed. The soil has to be prepped first before the gravel can be laid down. The IECC a regulatory code that ensures new construction is environmentally conscious requires a minimum of R-10 insulation in Climate Zones 4-8.
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Joined Jan 3 2011. Gravel underneath concrete can be used for one of two purposes. Ideally 6 inches of crushed stone or gravel should be used for most driveways. More gravel is better but 3 inches is the minimum amount of gravel you should have with a 4 slab. Its about 375 cu yards of crete or like 400 It will cost 100 for gravel to fill in 2 but my crete is still only a little cheaper and it will be a thinner slab.
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The last thing you want your customers to envision when thinking of a concrete floor is a damp cold basement slab. Paver base gravel brick blocks or concrete in applications such as crushed stone or crushed rock patios sidewalks and driveways. I dont know the science behind it but Ive only seen gravel used once and that was on military ammunition bunkers in Arkansas. Gravel for Concrete Depending on what the driveway will be used for the base may need to be 4 to 12 inches. What kind of gravel do you use under concrete.
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I could put gravel in say 2 and 35 of concrete over that or just full 55 of crete or I could do lot of gravel and a 2 top coat over that with a bunch of steel and fibers. First off the gravel base should be around 10cm 4 inches deep and 10cm more for the slabs themselves. If you have to remove more than a few inches of dirt consider renting a skid loader or hiring an excavator. Coarse gravel like 57 stone under a slab is used as a capillary break to prevent ground moisture wicking up through the concrete. Since posting Ive chatted with an engineer friend who said 4 concrete is plenty.
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The problem is the crush and run - or crusher run as Ive heard it called - is compact-able - and 57 stone - gravel - naturally is compacted when its dumpedspread. If you have clay or loam soil you should remove enough to allow a 6- to 8-in. All good concrete needs the bottom almost as flat as the top creating a uniform thickness to maximize strength. First off the gravel base should be around 10cm 4 inches deep and 10cm more for the slabs themselves. All of these layers together comprise the soil.
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Folks generally use sand under the slab around here. Folks generally use sand under the slab around here. Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Our soil is primarily red clay. First off the gravel base should be around 10cm 4 inches deep and 10cm more for the slabs themselves.
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If you have clay or loam soil you should remove enough to allow a 6- to 8-in. Its about 375 cu yards of crete or like 400 It will cost 100 for gravel to fill in 2 but my crete is still only a little cheaper and it will be a thinner slab. All good concrete needs the bottom almost as flat as the top creating a uniform thickness to maximize strength. If you have clay or loam soil you should remove enough to allow a 6- to 8-in. I dont know the science behind it but Ive only seen gravel used once and that was on military ammunition bunkers in Arkansas.
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Gravel is especially important in clay soil because it doesnt drain well which results in water pooling under the concrete slab and. Use ¾ washed and screened gravel then compact it to level. If the IECC requires rigid insulation under concrete slab youll also need to get. If you have to remove more than a few inches of dirt consider renting a skid loader or hiring an excavator. The soil has to be prepped first before the gravel can be laid down.
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Gravel underneath concrete can be used for one of two purposes. For a capillary barrier to allow water to drain underneath the slab coarse washed gravel is usually installed 4 to 8 inches thick. What do you put under a concrete slab. So you have the chance of settlement underof the concrete and or cracking of a slab with a compact-able sub-base - unless you are able to fully compact it in lifts - layer by layer. Just scrape off the sod and topsoil and add gravel fill if needed.
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The IECC a regulatory code that ensures new construction is environmentally conscious requires a minimum of R-10 insulation in Climate Zones 4-8. If you have to remove more than a few inches of dirt consider renting a skid loader or hiring an excavator. Folks generally use sand under the slab around here. The last thing you want your customers to envision when thinking of a concrete floor is a damp cold basement slab. Reflective Insulation Materials Used Under Concrete Slabs Technical Bulletin 101.
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Gravel for Concrete Depending on what the driveway will be used for the base may need to be 4 to 12 inches. One of the reasons those old basement floors were like that was because they had no vapor barrier beneath them leaving an easy path for water vapor from the soil to migrate into the slab assuring that the cold clammy damp feeling never went away. Since posting Ive chatted with an engineer friend who said 4 concrete is plenty. Layer of compacted gravel under the new concrete. It doesnt matter if its clay soil or dirt as long as you have an appropriate layer under the concrete.
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SOFFIT The underside of a slab or eave. Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Depending on where you live rigid insulation under a concrete slab might be required. Yes to your questions on rebar and placement of it. The best sub-base for a concrete slab is gravel.
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Ideally 6 inches of crushed stone or gravel should be used for most driveways. Its about 375 cu yards of crete or like 400 It will cost 100 for gravel to fill in 2 but my crete is still only a little cheaper and it will be a thinner slab. What kind of gravel do you use under concrete. Layer of compacted gravel under the new concrete. All of these layers together comprise the soil.
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Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. For structural purposes gravel or limestone aggregate may be used to improve the bearing ability of the subgrade. Since posting Ive chatted with an engineer friend who said 4 concrete is plenty. The subbase according to ACI 3021 Guide to Concrete Floor and Slab Construction is a layer on top of the subgrade of compactible easy to trim granular fill that will remain stable and support construction traffic. I dont know the science behind it but Ive only seen gravel used once and that was on military ammunition bunkers in Arkansas.
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He also suggested 1 sand then 4 of 34 gravel compacted then the 4 concrete. Our soil is primarily red clay. Gravel is especially important in clay soil because it doesnt drain well which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains. The soil has to be prepped first before the gravel can be laid down. Use ¾ washed and screened gravel then compact it to level.
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