- Should you put plastic under concrete?
- How thick of a concrete slab do I need?
- How long does a concrete slab last?
- Is quikrete as good as concrete?
- How much does a 20×20 concrete slab cost?
- Is concrete waterproof?
- Is it cheaper to pour concrete yourself?
- Can I pour concrete directly on dirt?
- What is the best fill under concrete?
- Do you need rebar for 4 inch slab?
- Should I use concrete or cement?
- Do you need stone under a concrete slab?
Should you put plastic under concrete?
Recently, though, research has shown that the old traditional layer of 6-mil Visqueen (polyethylene plastic) under the slab is seldom effective for two main reasons: Although it may seem water-tight, this grade of material allows a lot of water vapor to pass through..
How thick of a concrete slab do I need?
Standard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. To prepare the base, cut the ground level to the proper depth to allow for the slab thickness.
How long does a concrete slab last?
Early 20th-century engineers thought reinforced concrete structures would last a very long time – perhaps 1,000 years. In reality, their life span is more like 50-100 years, and sometimes less.
Is quikrete as good as concrete?
Quikrete Fast-Setting Concrete Mix is easy to use — just add water — and it sets in 20 to 40 minutes. It’s the most efficient option for setting posts for things like mailboxes, fences and lamps. … That’s stronger than the concrete used for foundations on most homes.
How much does a 20×20 concrete slab cost?
Concrete Slab Cost CalculatorSize (in feet)Approximate Cost12x20$1,44020×20$2,40024×24$3,46020×30$3,60010 more rows
Is concrete waterproof?
Concrete is a pretty remarkable manmade material that’s extremely durable over time. … That means concrete is not waterproof. Brand new cured concrete might be relatively waterproof for a little while, but it doesn’t take long at all for water to penetrate the surface and begin to cause deterioration.
Is it cheaper to pour concrete yourself?
One of the least expensive ways to get concrete is to mix your own. You can buy bags of the mix from a home improvement store. Typically, you only have to add water for it to be ready to pour. … Otherwise, you risk getting a weaker concrete once it cures, which could lead to cracks or crumbles within a couple of years.
Can I pour concrete directly on dirt?
Long story short, yes you can pour concrete over dirt.
What is the best fill under concrete?
The top 6 to 12 inches of the backfill under the slab should be filled and compacted with well-graded gravel or crushed material. “Walls are typically backfilled with the removed earth or with a granular, open-graded material,” says Tull.
Do you need rebar for 4 inch slab?
No, you do not need rebar for a 4-inch slab of concrete on grade. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. Rebar is recommended on concrete measuring 5 – 6 inches thick.
Should I use concrete or cement?
Concrete works well in larger projects, while cement is more often used in smaller jobs. One of the strongest and longest-lasting materials known to man, concrete is used to build schools, bridges, sidewalks, and countless other structures. But you don’t need a hard hat to have success with concrete.
Do you need stone under a concrete slab?
Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab. Adding a layer of crushed stone will add proper drainage, as well as create a barrier between your slab and the ground.