Best answer

crushed stoneBecause 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..

Answered by: Ashwin Nanjappa Date created: Jun 27, 2022

Do you need stone under a concrete slab?

Asked By: Claude Houle Date created: Jun 20, 2022

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.

Answered By: Developine Date created: Jun 22, 2022

Can you pour concrete on clay?

Asked By: Yaz Date created: Jun 23, 2022

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. With proper preparation, however, it's possible to pour a slab on clay soil without encountering these problems.

Answered By: Aaron Krauss Date created: Jun 23, 2022

How do you run a pipe under a concrete slab?

Asked By: robertc Date created: Jun 20, 2022

In six simple steps you can dig under concrete:Attach drill pipe.Connect garden hose.Dig a small ditch.Start your bore.Add more drill pipe (if necessary).Pull piping through.

Answered By: Merlyn Morgan-Graham Date created: Jun 21, 2022

What kind of cement should I use for a stone wall?

Asked By: karmakaze Date created: Jun 15, 2022

Type N: This medium-strength mortar is the type most commonly used. It is suitable for general use in above-grade exterior masonry, such as freestanding walls and nonloadbearing structures such as planters.

Answered By: Ogglas Date created: Jun 15, 2022

Do you have to use thinset under cement board?

Asked By: Matt Ryall Date created: Jun 17, 2022

No Thinset underneath the backer board “The thinset goes ON TOP of the cement board to stick the tiles!” ... Cement board is a different product and it needs to be installed in its own way. Additionally, screws don't take the place of thinset either.

Answered By: iacob Date created: Jun 18, 2022

What is the best flooring for a basement cement floor?

Asked By: Evk Date created: Jun 21, 2022

Ceramic tile is the designer's choice, with tons of colors and styles. It's unaffected by moisture and goes directly onto concrete that's smooth and free of cracks. Vinyl tile and sheet flooring also goes directly over prepared concrete and will withstand even minor flooding with no ill effect.

Answered By: rmtmckenzie Date created: Jun 21, 2022

How much does it cost to replace a sewer line under a concrete slab?

Asked By: Rinto George Date created: Jun 12, 2022

The cost to replace a sewer line under a slab costs $3,000 to $5,000 for smaller jobs and $15,000 to $20,000 total for larger jobs.

Trenching under a slab can cost an extra $150 to $200 per foot..

Answered By: Joachim Isaksson Date created: Jun 14, 2022

What can I use instead of a concrete slab?

Asked By: Thomas Dickey Date created: Jun 10, 2022

Gravel is one of the more common alternatives to concrete. There are a few different types you can find in the home improvement store that can replace concrete cement used for driveways and walkways. These include pea gravel, crushed stone, and quarry process....Gravel.Pavers.Timber sleepers.Asphalt.Resin.Sand.Mulch.

Answered By: DhruvPathak Date created: Jun 12, 2022

What kind of concrete do you use for a fire pit?

Asked By: N Sharma Date created: Jun 16, 2022

Quikrete 5000 (20-25 Bags) QUIKRETE® 5000 Concrete Mix is a commercial-grade blend of stone or gravel, sand, and cement and is specially designed for higher early strength. This is the recommended concrete mix to use because of the high early strength and low price.

Answered By: bhaginath Date created: Jun 18, 2022

What kind of cement is used for crafts?

Asked By: eipi10 Date created: Jun 16, 2022

Lime-based Portland cement is commonly used and mixed with gravel (crushed stone) to make the typical mix used for your sidewalks. But as a crafter I often use a finer mix but there are still a few to choose from.

Answered By: Simon Tewsi Date created: Jun 18, 2022

Related Question Answers

Thomas Dondorf

Professor

Can a concrete slab be too thick?

If the slab is too thin, it may break under load and fail before its time. If the slab is too thick, it costs more than it should. Slab thickness is a major factor in the cost of a concrete floor, so there's often pressure, which can become intense, to make the slab as thin as possible.

Bob Snyder

Professor

Can concrete cure under water?

Water Cure Concrete made with Portland cement will harden even if it is completely under water.

In fact, one technique for curing a concrete slab is to build a soil dam around the perimeter of the slab, flood the slab with water and keep the slab covered with water for a week..

pirho

Professor

Can you glue stone veneer to cement board?

What can I put stone veneer on for an interior application? For interior applications, stone veneer can be installed over cement board, drywall, and all of the above.

Joe

Professor

How do you install moisture barrier under concrete slab?

Most exterior slabs do not need a vapor barrier. ... In general, place the concrete slab directly on top of the vapor barrier, with the subbase below. ... The vapor barrier can be placed under the subbase, if the building is closed in when the dry subbase material is placed.More items...

Bill

Professor

Do I need mesh in my concrete slab?

Concrete is strong in compression, but not under tension. So, if it flexes, like a slab with a vehicle on top of will do, it cracks at the bottom whre the flexing becomes tension. ... Mesh will help mitigate the chances of cracking of the slab due to differential settlement.

Chin. Udara

Professional

Does plaster of Paris go bad?

Throw it away along with the whole bag – it is useless. Some types of plaster do store better than others, I find 'stone' plasters last longer than those resembling Dental plaster or Herculite while plaster of paris is very poor and goes 'bad' very quickly.

Doug

Professional

What is the difference between sand and concrete sand?

Fill Sand is a coarse river sand which contains pebbles. It is commonly used under flagstone walks and informal stone patio areas. Works well as a medium for breaking up clay or poorly draining soils. Concrete Sand is a sand which has angular granules and packs very well.

samcarter_is_at_topanswers.xyz

Professional

What is the cement box casket goes in?

What Is a Vault? A vault is also commonly known as a grave vault, burial liner, or burial vault. No matter what you call it, this sturdy receptacle serves as a protective container for the casket.

Michal Levý

Professional

What type of hardwood flooring is best for concrete slab?

engineered wood floorA floating floor is the perfect companion for a concrete subfloor. According to flooring experts, the best kind of wood flooring to use with a concrete subfloor is a floating engineered wood floor. This kind of floor performs well, resists moisture and is easy to install.

MiniQuark

User

What type of insulation goes under concrete slab?

Two of the rigid foam insulations most commonly used below grade and under slabs are expanded polystyrene (EPS) and extruded polystyrene (XPS). Although both are closed cell insulations, they perform very differently over the long term.

bensiu

User

Can concrete be poured over stones?

Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Similarly, if there are roots or plants under your slab, they may rot and cause unevenness. Pouring concrete over crushed stone, however, will eliminate these worries.

Nina Scholz

User

Can you add cement to a gravel driveway?

Laying a concrete driveway over an existing gravel one is possible, but it is not generally recommended. ... The kind of gravel that is intended to go under cement is typically a smaller grade than what is used for gravel driveways.

Simon Mourier

User

Can water go under concrete slab?

Weakened water lines. Since water lines are laid down under the concrete slab, there can be minor damage such as small nicks when the concrete is poured. Although these occurrences may not cause immediate leaks, they can weaken the pipes and grow into a leak-causing crack later.

warren

User

Can you put footings under concrete slab?

edit - To put footings under the slab, you can cut holes wherever needed, excavate for footings (Sonotubes or concrete piers or similar) and then patch the concrete slab.

cyberwombat

Guest

What is the best insulation for under a concrete slab?

Applying a bead of polystyrene-compatible caulk or mastic to the top of the insulation board minimizes water infiltration behind it. For under-slab applications, the rigid foam insulation typically should be installed over a gravel base, with a poly vapor diffusion retarder between the gravel and insulation.

Harsh Bhikadia

Guest

What goes under concrete driveway?

Use wire mesh for driveways that are 4 to 5 inches thick, and rebar for those that are 5 inches or more. Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. In either case, blocks should be used under the reinforcement to keep centered within the concrete.

marapet

Guest

What is the purpose of a vapor barrier under concrete slab?

The use of a vapor barrier (more accurately termed a vapor retarder), having a water vapor permeance of less than 0.3 perm is frequently used to retard the flow of moisture through the slab. These vapor retarders are typically polyethylene or polyolefin sheeting materials.

Ricardo Altamirano

Guest

What kind of sand do you use for a concrete slab?

Sharp Sand (which has larger grains) is used for concreting or laying paving slabs and Soft Sand is used for bricklaying, etc.

It is also possible to buy mixed aggregate containing both coarse and fine aggregates..

Murli Prajapati

Guest

What animal would burrow under a concrete slab?

Rats, mice, moles, voles, gophers, and several other types of ground-burrowing rodents are natural diggers, constantly seeking out shelter and sources of food. Sometimes, they choose to make their dwelling space underneath concrete foundations.

Dax Feliz

Guest

What happens when you pour concrete over grass?

You should not pour concrete over the grass directly. For your concrete to harden flat and smooth, it is best to clear all vegetation and pour the concrete on top of smooth and debris-free soil. Leaving grass under your concrete slab can cause some unnecessary issues for you in the future.

Konrad

Guest

Will concrete cure under water?

Water Cure Concrete made with Portland cement will harden even if it is completely under water. In fact, one technique for curing a concrete slab is to build a soil dam around the perimeter of the slab, flood the slab with water and keep the slab covered with water for a week.

Wes Hardaker

Guest

What are concrete activities?

Concrete play is any kind of tangible, hands-on play where your child uses his body or hands to manipulate things. The flipside of concrete play is abstract play. ... Concrete play “helps the brain so naturally build on what it already knows.

Alexander Artemenko

Guest

Can concrete cure underwater?

Concrete made with Portland cement will harden even if it is completely under water. In fact, one technique for curing a concrete slab is to build a soil dam around the perimeter of the slab, flood the slab with water and keep the slab covered with water for a week.

A.T.

Guest

Can you add footers to a concrete slab?

edit - To put footings under the slab, you can cut holes wherever needed, excavate for footings (Sonotubes or concrete piers or similar) and then patch the concrete slab.

fracz

Guest

Can you pour concrete on soft ground?

If you drive over a concrete slab that's got soft ground under it, the concrete wants to bend and stretch. ... If the concrete does develop a hairline crack, the crack should not open with the steel in place. Compacting the soil under the slab before the pour also prevents tension cracking.

Get Off My Lawn

Guest

Do you put plastic under concrete slab?

In California they place sand between slabs and plastic vapor barriers—in Florida they don't. Almost everywhere (except “California”) that slabs are placed on the ground—a plastic sheet—a vapor barrier—is located directly under the concrete slab and on top of the ground (Photograph 1).

techraf

Guest

How do you remove chair rail from plaster walls?

Removing the Chair Rails from the WallsUse a utility knife to score along the edges of the trim. ... Insert the edge of the pry bar beneath the wood trim and hit it with a rubber mallet a few times until it goes under the wood more. ... Use the pry bar to pull the trim from the wall a bit.More items...•Sep 20, 2019

GateKiller

Guest

What kind of Thinset do you use for concrete floors?

Modified thinset is the product of choice for most tile installations because of its increased strength and bonding with minimal shrinkage, which means a reduced chance of cracks forming in the tile. WarmlyYours Radiant Heating recommends modified thinset mortar for nearly all tile and stone installations.

bdukes

Guest

What happens if you pour concrete on dirt?

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. With proper preparation, however, it's possible to pour a slab on clay soil without encountering these problems.

kqw

Guest

Do I need gravel under my concrete slab?

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..

sehe

Guest

What is the difference between a concrete slab and a cement slab?

The difference between cement and concrete Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. Concrete gets stronger as it gets older. ... Cement comprises from 10 to 15 percent of the concrete mix, by volume.

Saeb Amini

Guest

What kind of Thinset goes under cement board?

Use thin-set mortar when installing cement backerboard. Thin-set dries slowly, allowing you to fix and readjust backerboard sheets as needed. With the smooth side of a 1/4-inch notched trowel, spread enough mortar for one sheet. Ridge the mortar with the notched side of the trowel.

daGUY

Guest

Is UltraTech Cement good for slab?

UltraTech Concrete Slab Plus has been designed for all kind of roofs and slabs. It is impervious, durable and has been designed by adding special additives and compounds that minimize chances of water seepage in the slab.

Sjoerd

Guest

Should you put plastic under 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.

Black Mamba

Guest

What is a floating concrete slab?

Floating slabs are concrete slabs that are laying over the ground, without any kind of anchoring, as if it simply sits on it and floats. Floating slab, as the name tells it resembles a plate that is simply laid over water, with no kind of connection between them.

Alex Waygood

Guest

What is concrete dusting or chalking?

Dusting Concrete Surface. Formation of loose powder resulting from disintegration of surface of hardened concrete is called dusting or chalking. The characteristics of such surfaces are: They powder under any kind of traffic. They can be easily scratched with a nail or even by sweeping.

Rahul

Guest

What is the best base for a concrete slab?

Most concrete contractors want a mix of coarse and fine aggregate to create a compactable base that is going to be safe for settlement and drainage. Crusher run (a mix of crushed stone and stone dust) is one of the best base materials for concrete flatwork.

Sergio del Amo

Guest

What is the purpose of plastic sheeting under a concrete slab?

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.

Chriki

Guest

How thick should concrete floor insulation be?

Designers generally insulate both directly under the slab and around the perimeter as well. In cold climates it is advisable to use a minimum of 2 inches of extruded polystyrene under the slab. Many increase the under-slab insulating foam board thickness to 3 or 4 inches at the outer 2 to 4 feet of the slab.

Tom Slabbaert

Guest

What goes behind cement board in shower?

Cement Board and a Liquid Membrane No plastic sheeting goes behind the cement board. A liquid waterproofing membrane, such as RedGard or Hydro Ban, is applied to the cement board and allowed to cure. Then, tile is installed over the membrane.

lost9123193

Guest

Will concrete cure in water?

Water Cure Concrete made with Portland cement will harden even if it is completely under water. In fact, one technique for curing a concrete slab is to build a soil dam around the perimeter of the slab, flood the slab with water and keep the slab covered with water for a week.

Ryan

Guest

Will hydraulic cement bond to concrete?

Hydraulic Cement is Weak – Cement of any kind, by itself, has little structural strength – that's why it's most often combined with sand and aggregate to form concrete, a very strong material. Cement alone is generally used as mortar to “glue” together masonry materials like brick, stone or concrete block.

squiguy

Guest

Can I pour cement over gravel?

Laying a concrete driveway over an existing gravel one is possible, but it is not generally recommended. ... The kind of gravel that is intended to go under cement is typically a smaller grade than what is used for gravel driveways.

Alberto Chaves

Guest

What kind of concrete do you use for a garage slab?

The IRC requires that slabs be built with concrete with compressive strengths from 2500 to 3500 psi, depending on the climate. ACI goes further and recommends 4500-psi concrete for garages in the northern half of the country.

Peter B

Guest

What's the difference between a concrete slab and a cement slab?

Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement.

Atif Mahmood

Guest

Can you lay concrete over pebbles?

Laying a concrete driveway over an existing gravel one is possible, but it is not generally recommended. The kind of gravel that is intended to go under cement is typically a smaller grade than what is used for gravel driveways.

hilberts_drinking_problem

Guest

Do I need gravel under concrete slab?

You do need gravel under a concrete slab, footing, or patio. Gravel provides a solid foundation for your concrete as it can be compacted. It also improves drainage, preventing water from pooling beneath the concrete.