- Do I need gravel under concrete?
- Is Concrete bad for soil?
- What do you use to bond concrete to concrete?
- Does concrete kill grass?
- Why do you put gravel under concrete?
- Do you need rebar for 4 inch slab?
- How do you attach concrete to old concrete?
- Can you pour concrete directly on dirt?
- Should you put plastic under concrete?
- How long does fake grass last?
- Can you put dirt over rocks and grow grass?
- What do you put down before putting concrete?
- Can you lay concrete over existing concrete?
- Can I lay a lawn on concrete?
- Is Wet Concrete bad for your skin?
- What is the best base for a concrete driveway?
- What type of gravel goes under concrete?
- How many inches of gravel do you need for a concrete slab?
- How do you secure artificial turf to concrete?
- What happens if you pour concrete over grass?
Do I need gravel 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.
Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains..
Is Concrete bad for soil?
Concrete Raises Soil pH Concrete is alkaline in nature, meaning it has a pH of 7.0 or above. It gets its high pH from several ingredients containing calcium. … Over time, the water leaches calcium carbonate out of the concrete and into the soil, resulting in soil near the concrete structure having a higher pH.
What do you use to bond concrete to concrete?
Quikrete 1 Gal. Concrete Bonding Adhesive permanently bonds existing concrete, plaster and stucco to new concrete, plaster and stucco. It can be used indoors and outdoors on concrete overlays 1 in. or thicker.
Does concrete kill grass?
Depending on how much was washed onto the grass, it could kill the grass, rather than just cause a temporary die-back. However over time it will react with CO2 in the air and turn into calcium carbonate, which is alkaline, but not caustic. A pH test will tell you if you need to make any adjustments.
Why do you put gravel under concrete?
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.
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.
How do you attach concrete to old concrete?
Drill 5/8-inch diameter holes six inches deep into the old concrete. … Flush the holes with water.Inject epoxy into the backs of the holes. … Insert 12-inch lengths of rebar into the holes, twisting them to ensure an even coating of epoxy around their circumferences and along their lengths within the holes.More items…
Can you pour concrete directly on dirt?
Long story short, yes you can pour concrete over dirt.
Should you put plastic under concrete?
The sand layer cannot dry downwards by vapor diffusion because of the plastic sheet—it is a vapor barrier after all. In fact that’s why we have it under the slab. We want a vapor barrier under the slab. ** We want to prevent water vapor from coming up from the ground into the concrete slab.
How long does fake grass last?
20 yearsAs a general rule, you can expect your synthetic lawn to last an average of 20 years. The grass is designed to be UV resistant, so the color of the blades do not fade. The material, (polypropylene, polyethylene or polyamide yarns) is resistant to damage and eco-friendly.
Can you put dirt over rocks and grow grass?
Pouring a several-inches-thick layer of topsoil over rocky ground doesn’t ensure a healthy lawn. After you remove rocks or the top few inches of soil and loosen soil in an area, however, adding topsoil gives a soft landing place for grass seeds and the resulting new grass roots to grow.
What do you put down before putting concrete?
To shore up the subsurface, sprinkle a thin layer of cement sand onto the gravel and dampen it with water. Do not leave any standing water and allow the dampened sand to dry for about an hour before pouring the concrete. Ground preparation is key to pouring sidewalk, driveway or any other concrete slab.
Can you lay concrete over existing concrete?
If done properly, new concrete can often be poured right over an existing slab. … For this to be feasible, the contractor needs to pour at least 2 inches thick, use smaller aggregate, and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete.
Can I lay a lawn on concrete?
It is possible to lay artificial turf over concrete. Artificial turf is a good choice for all hard surfaces, as it requires little maintenance. Real turf isn’t suitable for use over concrete, as the base can’t provide good depth and drainage to the grass.
Is Wet Concrete bad for your skin?
Normal human skin has a pH of 5.5; therefore, wet cement can produce alkaline (caustic) skin burns which progress and get worse without more exposure. A worker may have wet concrete on his or her skin for hours without feeling any discomfort; however, the cement is damaging the skin microscopically.
What is the best base for a concrete driveway?
The gravel base for a driveway should be a minimum of 4 inches deep. If heavier vehicles, such as large trucks, will use the driveway regularly, the gravel should be even deeper, up to 12 inches. Poor soil or a sloped driveway may also require deeper gravel.
What type of gravel goes under concrete?
“Six inches of well-graded gravel or crushed stone material properly compacted will give good results,” said Mark Conrardy, a sales engineer manager for Wacker Corp., Menomonee Falls, Wis. When properly compacted, both native soils or imported granular materials can provide good support.
How many inches of gravel do you need for a concrete slab?
Excavate the slab area to a depth of about 7 inches, allowing 3 inches for a gravel base and 4 inches for concrete.
How do you secure artificial turf to concrete?
Artificial Grass Glue CalculatorStep 1 – Clean Existing Concrete. … Step 2 – Install Drainage Holes If Required. … Step 3 – Install Artificial Grass Foam Underlay. … Step 4 – Cut Grass to Size and Prepare Joints. … Step 5 – Secure the Perimeter with Artificial Grass Glue. … Step 6 – Add Kiln Sand and Brush Your Grass.
What happens if you pour concrete over grass?
You can pour concrete over grass, and depending on the thickness of the slab you may not have a problem. However, because the location may be unevenly compacted you can be assured that cracks will occur. Generally footings and slabs should be laid on undisturbed soil where compaction is solid and regular.