Quick Answer: Should You Put Plastic Under Concrete Driveway?

How thick should I pour my concrete driveway?

As for thickness, non-reinforced pavement four inches thick is standard for passenger car driveways.

For heavier vehicles, a thickness of five inches is recommended.

To eliminate standing water, the driveway should be sloped towards the street a minimum of one percent, or 1/8 inch per foot, for proper drainage..

What is the strongest concrete mix ratio?

In making concrete strong, these ingredients should usually be mixed in a ratio of 1:2:3:0.5 to achieve maximum strength. That is 1 part cement, 2 parts sand, 3 parts gravel, and 0.5 part water.

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.

How long do you leave plastic on concrete?

Cover It Up Covering fresh concrete with a plastic sheet has other benefits besides protecting it from rain. It can protect the new concrete from environmental cooling and heating fluctuations as it cures, and it helps resist uneven curing due to rapid moisture loss at the top. Leave it covered for 24 hours.

How long does it take for 4 inches of concrete to cure?

28 daysGenerally, concrete sets in 24 to 48 hours allowing for you to walk on it and partially cured within a week (keep the cement free and clear of heavy equipment during this period) at which you can continue building/construction. Most mixes fully cures at 28 days.

What happens if it rains while pouring concrete?

Pouring Concrete in Rain. … Pouring concrete in the rain can compromise its strength, increasing the tendency for dusting and scaling to develop. Once the damage is done, it can be hard to rectify and will often ruin the appearance of the finished surface. Don’t let it rain on your parade.

Do you need rebar for 4 inch slab?

Do you need rebar for a 4-inch slab? – Quora. No, depending on your proposed loads. But a 4″ thick slab really shouldn’t have rebar in it, too thin. Most thing slabs, like driveways or sidewalks have a wire mesh reinforcement in them not rebar.

How do I stop moisture in my concrete floor?

Methods Used to Stop Moisture in Concrete FloorsLow-permeance Vapor Barrier or Retarder. A Low-permeance vapor Barrier or retarder can effectively keep below-slab moisture from reaching the flooring system. … Allow Natural Drying of Concrete Slab. … Keep Excavation Free of Water.

Should you put plastic under a concrete slab?

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.

Should I use a vapor barrier under concrete?

Water vapor will always move from a high relative humidity environment below the building into an area of low relative humidity – even through concrete. That’s why nearly every expert in the concrete industry recommends a below-slab vapor barrier to stop the vapor drive of water upward and into your building envelope.

Do you 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 allows water to drain into the ground below. When packed tightly, however, the gravel doesn’t shift beneath the concrete.

What happens if you pour concrete on dirt?

Unfortunately, if you have clay-heavy soil, then you may run into difficulty when pouring a slab. The clay can compress under the weight of the concrete, causing the slab to shift or sink over time. It also can leach moisture from the concrete itself, resulting in uneven curing and a brittle base.

Will concrete cure at 30 degrees?

Cold Weather Concrete Tips. You can pour in cold weather, as long as certain precautions are taken. Concrete set time at 70 degrees is approximately 5 hours, at 50 degrees it is 10 hours, at 30 degrees it’s up to 20 hours (if the concrete doesn’t freeze!).

Is rebar needed in concrete driveway?

For a concrete driveway to last the life of your home, it must be well constructed. Concrete driveway slabs typically are 4 inches thick but can be up to 6 inches thick to provide additional support for large trucks and other heavy vehicle traffic. … One common building reinforcement material is rebar.

What do you put under a concrete driveway?

The gravel should be clean, free of sand or clay and fairly uniform in size and shape without any large stones. It should also compact easily and be evenly compacted before the concrete is poured to provide strength and stability.

Can I pour concrete directly on dirt?

Yes, you need to remove the top soil and be on natural ground or compacted fill. It is common for flatwork like sidewalks and patios. It is also used in structural foundations like mats. I have used concrete for a seal slab to provide a working surface for large transformer foundations.

Why do you put 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.

How do you prepare the ground before pouring concrete?

Preparation is the most important aspect of pouring a concrete slab.Dig the ground down to the proper depth. … Smooth out the ground with the flat side of a rake so that you have a level surface. … Tamp the ground with a hand tamper or mechanical tamper. … Pour 2 inches of small, rounded gravel for additional drainage needs.