Best answer

MFMA recommends the relative humidity level for a concrete slab for a non-glue-down maple floor system be 85% or lower and for glue down systems the concrete slab relative humidity level should be 75% or lower before installation.

Answered by: shirley Date created: Jun 27, 2022

Do you need stone under a concrete slab?

Asked By: VBasic2008 Date created: Jun 19, 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: Klas Mellbourn Date created: Jun 19, 2022

What is normal concrete cracking?

Asked By: Jouni K. Seppänen Date created: Jun 13, 2022

Probably the single most common reason for early cracks in concrete is plastic shrinkage. When the concrete is still in its plastic state (before hardening), it is full of water. This water takes up space and makes the slab a certain size. As the slab loses moisture while curing it gets a bit smaller.

Answered By: Tanishka Vashisht Date created: Jun 16, 2022

Are hairline cracks in plaster normal?

Asked By: Antonin GAVREL Date created: Jun 15, 2022

"Hi Angie, it is normal for new plaster to get hairline cracks as it dries out due to the material shrinking. It is especially prominent around ceilings if you have had new plaster boards put up.

Answered By: J. Abrahamson Date created: Jun 15, 2022

Can mold grow under concrete slab?

Asked By: Joy Wang Date created: Jun 24, 2022

Mold growth on concrete due to humidity is typically diffuse and spread across a large area. ... Therefore, unless the concrete is kept extremely clean, mold growth can occur. Of course, even if the concrete is covered in dust, mold will not grow without sufficient moisture.

Answered By: Dave W. Smith Date created: Jun 25, 2022

What do cracks in concrete floor mean?

Asked By: Linda Paiste Date created: Jun 23, 2022

Cracks in Concrete Flooring Often, these cracks are noticed when the floor above the concrete slab becomes damaged by the uneven concrete. Usually the damage of both floors is caused by the presence of water. You'll first need to locate the source of this water or moisture problem and fix it first.

Answered By: gbn Date created: Jun 26, 2022

What is reinforce concrete slab?

Asked By: Mark Date created: Jun 19, 2022

A reinforced concrete slab is a crucial structural element and is used to provide flat surfaces(floors and ceilings) in buildings. On the basis of reinforcement provided, beam support, and the ratio of the spans, slabs are generally classified into one-way slab and two-way slab.

Answered By: dbr Date created: Jun 20, 2022

Can moisture rise through a concrete floor?

Asked By: Alvaro Montoro Date created: Jun 11, 2022

“Moisture that rises from the substrate will be absorbed into and rise through the concrete slab, filling the pores and capillaries.” Hydration will usually occur — eventually.

Answered By: Pierre D Date created: Jun 11, 2022

What is the best flooring to put on a concrete floor?

Asked By: Michael Osofsky Date created: Jun 19, 2022

Like other flooring materials that work well over concrete slabs, laminate uses layers to fight moisture. This makes it a reliable option to install over your concrete slab. If you plan to transform your basement into a high traffic area for entertaining and relaxing, laminate could be a great option.

Answered By: Nate Date created: Jun 19, 2022

Can rebar cause concrete to crack?

Asked By: Erik Date created: Jun 11, 2022

The use of synthetic fibres, reinforcing wire mesh, or rebar can add some extra support to concrete, but none of them will prevent cracking. In fact, too much steel can actually cause a slab to crack by restraining normal concrete shrinkage.

Answered By: G M Date created: Jun 11, 2022

Why is my concrete turning white?

Asked By: Nadav Har'El Date created: Jun 14, 2022

Why is my concrete turning white? Efflorescence is a white salty residue caused when too much moisture is moving through the concrete. As the concrete dries and its moisture rises upwards through the slab, it brings salts within the concrete to the surface as well.

Answered By: trusktr Date created: Jun 15, 2022

Related Question Answers

sth

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What is the strongest concrete PSI?

6,000 psiAlthough there is no precise point of separation between high-strength concrete and normal-strength concrete, the American Concrete Institute defines high-strength concrete as concrete with a compressive strength greater than 6,000 psi.

Larnu

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Are hairline cracks in concrete normal?

Especially in hot weather, shrinkage cracks can occur as early as a few hours after the slab has been poured and finished. Often, plastic shrinkage cracks are only a hairline in width and are barely visible. However, even though a crack is hairline, it extends through the entire thickness of the slab.

Deepak Mahakale

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Can moisture come up through concrete slab?

The ground beneath nearly all concrete slabs is damp-in fact, it nearly always has a relative humidity of 100%. That means it is a continuous source of water vapor into the slab and the slab will never dry out-especially if you put a coating on the surface that restricts the movement of water vapor.

Darek Kay

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Can you pour concrete on muddy ground?

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. Clear and level the area where you plan to pour the concrete slab.

Patrick Desjardins

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How do you fix moisture in a concrete slab?

Installing sub-drains at the building perimeter to carry water away from a building: This technique incurs some cost but is the most effective solution to tackle any further detrimental effect of moisture on the concrete slab. Place a vapor retardant underneath the new floor finish.

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How do you install moisture barrier under concrete slab?

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Does concrete drain your energy?

Encased in steel, an Edison cell battery placed directly on a concrete floor would discharge more quickly than normal. ... Between the carbon and the pores, together with moisture and a concrete floor, this could potentially lead to a path for the electricity to flow, resulting in the battery draining.

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How concrete flooring is done?

Anatomy of a Concrete Floor This layer is covered with a vapor barrier sheet that prevents moisture from moving up into the concrete. A welded wire fabric mesh sheet is then placed over that in order to aid with adhesion. Finally, the concrete slab is poured directly onto these layers.

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What is concrete settlement?

When soils beneath a concrete floor slab become dry and shrink, the foundation takes on a new shape and form. Moisture in the soil causes it to expand and become more full than when it is dry. Dry soil will shrink and create unwanted space below the concrete slabs, causing them to settle on the newly formed foundation.

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How thick is the concrete on a tennis court?

100mmConcrete tennis courts technology has changed dramatically whereby the numerous expansion joints are not necessary. Depending on site conditions the normal slab is 100mm thick reinforced with F72 mesh. The strength of the concrete is 25mpa.

riQQ

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What is the density of concrete in kg m3?

about 2,400 kg per cubic meterAs for concrete itself, the density of concrete of normal weight is about 2,400 kg per cubic meter, or 145 lbs. per cubic foot.

Paulo Scardine

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What is the normal size of a concrete block?

Typically, concrete masonry units have nominal face dimensions of 8 in. (203 mm) by 16 in. (406 mm), available in nominal thicknesses of 4, 6, 8, 10, 12, 14, and 16 in.

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Why is my Portland cement cracking?

There are two and only two factors which produce all cracking in Portland cement plaster. One is that normal change in volume of Portland cement plaster intrinsic to the hydration and curing of the cement binder and /or the loss of the mix water in excess of the moisture required for hydration.

Maelandieg

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Is it normal for concrete slab to crack?

As the slab loses moisture while curing it gets a bit smaller. As the concrete shrinks, the slab could crack in order to relieve tension. Shrinkage cracks are common and can occur as early as a few hours after the slab has been poured and finished. Usually they are not a threat to the structure.

hobbs

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What temperature can cement be used?

When operating under normal working temperatures, industry practices states that mortar use should remain in an ambient temperature range of 4.4 - 37.8° C.

B Seven

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Why is my concrete floor hot?

This is one of the most common signs. If you find that your floors are warmer than normal, or warm in some areas but cool in others, it could be because a slab leak has caused hot water to warm the concrete under your home, thus heating your floors as well.

daydreamer

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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.

mythz

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Can you put ceramic tile on concrete basement floor?

A: It's perfectly acceptable to put tile directly on concrete — with a couple of caveats. First, it is important to determine if there is moisture coming up from the slab. You can test for moisture by taping all four sides of 18-by-18-inch polyurethane plastic on the slab.

Atul Sharma

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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..

PositiveGuy

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Why does my concrete slab sweat?

Why Floors Sweat When warm humid air from outside comes into contact with the cold concrete the air rapidly cools and condenses on the surface causing the wetness. ... Other causes for sweating floors is lack of moisture barriers beneath the slab hence the movement of moisture from underneath to the surface.

John Rotenstein

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What are three major types of concrete details?

Find here Details of some of these various types of concrete.Normal Strength Concrete. The concrete that is obtained by mixing the basic ingredients cement, water and aggregate will give us normal strength concrete. ... Plain Concrete. The plain concrete will have no reinforcement in it. ... Reinforced Concrete.

Jerry Coffin

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How do you prevent moisture problems in concrete floors?

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Xeo

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Do I need insulation under a concrete floor?

Creating an insulation layer and a vapor barrier between the concrete slab and the ground beneath it is the best practice in insulating basement floors.

The insulation barrier will help keep warm air in, and the vapor barrier will keep unwanted moisture out..

Seth Geoghegan

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How thick is a normal concrete slab?

4 to 6 inchesMost specifications for retail or commercial concrete slabs specify 4 to 6 inches of thickness. Owners and contractors have historically disputed whether a poured slab meets a specification because of its thickness.

ruddra

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Does putting a car battery on concrete drain it?

Encased in steel, an Edison cell battery placed directly on a concrete floor would discharge more quickly than normal.

...

Between the carbon and the pores, together with moisture and a concrete floor, this could potentially lead to a path for the electricity to flow, resulting in the battery draining..

Eelke

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Can you paint concrete with normal paint?

Paint formulated to attach to wood, metal, and plaster won't attach itself well to the microporous surface of a concrete slab.

Attempts to use interior household paint with concrete usually end in a bare or half-flaked wall in less than a year if special measures aren't applied..

cjs

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What is concrete slab-on-grade?

A slab-on-grade is a type of shallow foundation in which a concrete slab rests directly on the ground below it. A slab-on-grade foundation usually consists of a thin layer of concrete across the entire area of the foundation with thickened footings at the edges or below load bearing walls in the middle of the building.

Pedro Lobito

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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.

Thoriya Prahalad

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Are concrete slab cracks normal?

ANSWER: Every concrete slab has cracks.

Even when you don't see them, slabs are laced with networks of micro-cracks resulting from common shrinkage.

When new concrete hardens, shrinkage always occurs.

And because concrete is not an elastic material, cracks are inevitable and rarely a cause for concern..

Prakhar Gyawali

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What is the best flooring to put over a concrete slab?

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What is normal strength concrete used for?

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Francesco Boi

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What is a concrete class?

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matt wilkie

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What is the best slump for concrete slab?

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Aren

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Are hairline cracks in new concrete normal?

Hairline cracks in a concrete slab are rarely a cause for concern. They can be controlled, but not eliminated. A crack in a slab of 1/8 inch or less is typically a normal shrinkage crack and not a cause for concern.

hyde

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Is cracking in concrete normal?

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Nadav Har'El

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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.

Alapan Das

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Is cracking in new concrete normal?

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Is it normal for concrete floors to crack?

When you see a crack in your concrete slab or wall, your first assumption is typically that something has been done wrong–but that's not always the case. Actually, concrete cracks are very common, some are even inevitable.

Konrad 'Zegis'

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Is it normal for new concrete to crack?

As the slab loses moisture while curing it gets a bit smaller. As the concrete shrinks, the slab could crack in order to relieve tension. Shrinkage cracks are common and can occur as early as a few hours after the slab has been poured and finished. Usually they are not a threat to the structure.

Eric O Lebigot

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Should I insulate under my concrete slab?

Creating an insulation layer and a vapor barrier between the concrete slab and the ground beneath it is the best practice in insulating basement floors. The insulation barrier will help keep warm air in, and the vapor barrier will keep unwanted moisture out.

Lazarus

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What are important concrete properties?

The properties of hardened concreteMechanical strength, in particular compressive strength. The strength of normal concrete varies between 25 and 40 MPa. ... Durability. ... Porosity and density. ... Fire resistance.Thermal and acoustic insulation properties.Impact resistance.Jan 31, 2008

I Support The Boycott

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What is concrete burn?

Concrete burns – Causes & treatment Once concrete starts hardening, burns can form slowly over hours or days. That's because, in order for concrete to harden, it has to absorb moisture, drawing water away from anything that holds moisture—even wet clothing and skin—which only aids in the drying process.

pixelearth

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What is concrete moisture content?

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Darryl RN

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What is the difference between white cement and normal cement?

White Portland cement is made from raw materials containing little or no iron or manganese, the substances that give conventional cement its gray color. ... White cement production needs usually 40% higher energy than the normal grey cement and this contributes to the high price of white cement.

kender

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What is the R value of a 6 inch concrete wall?

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What is Type 2 cement used for?

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DreadedFrost

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Is cement board stronger than plywood?

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hardillb

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What can you cover cracked concrete with?

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What happens after plaster is removed?

Once the plaster is removed After the plaster cast is removed, common issues include: There may be some stiffness and weakness in the limb. This should improve as you go about your normal activities. Sometimes physiotherapy is needed to help you recover.

aynber

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Why is my colored concrete turning white?

Why is my concrete turning white.

Efflorescence is a white salty residue caused when too much moisture is moving through the concrete.

As the concrete dries and its moisture rises upwards through the slab, it brings salts within the concrete to the surface as well..