the water below water vapor and concrete slabs expert
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the water below water vapor and concrete slabs expert.

Moisture Problems Plague Flooring From Concrete Slabs FG ...

By: Expert 159616 A.I.A. Water or water vapor rising out of a concrete slab on grade can cause adhesion loss, warping, peeling and an unacceptable appearance of resilient floor coverings. Beneath seamed, continuous flooring, moisture can also cause adhesive deterioration, ripping or separation of seams and air bubbles or efflorescence deposits.

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Creating a Moisture Vapor Barrier Under Concrete Slab ...

Vapor retarders are manufactured to meet ASTM E1745 specifications (standard specification for water vapor retarders used in contact with soil or granular fill under concrete slabs). There are three classifications: A, B, and C, with A being the most resistant to

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Vapor Barriers for Existing Slabs - The Concrete Network

This vapor can then develop more pressure than the bond strength between the topping and the slab, delaminating the topping. Slabs that lack under-slab vapor barriers will nearly always have some water vapor emission from water below the slab, and newer slabs, even with vapor barriers, will need time to

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Moisture Mitigation for Concrete Slabs

Under ideal conditions for floor construction, concrete having a practical low water-cement ratio (0.45 to 0.50) is placed on a true vapor barrier and cured 3 to 7 days using a method that retains mixing water but doesn’t add additional water. The slab is placed with a watertight roof in place and no water from other sources contacts the floor

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Moisture Problems Plague Flooring From Concrete Slabs FG ...

By: Expert 159616 A.I.A. Water or water vapor rising out of a concrete slab on grade can cause adhesion loss, warping, peeling and an unacceptable appearance of resilient floor coverings. Beneath seamed, continuous flooring, moisture can also cause adhesive deterioration, ripping or separation of seams and air bubbles or efflorescence deposits.

Get Price

Moisture In Concrete - force

Apr 11, 2018  Water vapor is capable of penetrating where water in a liquid form cannot. By comparing the vapor pressure in differing environments, one can estimate the movement of vapor pressure through concrete. However, in reality, vapor emissions levels are complex due to variations in temperature, humidity, permeability, and flow path through the concrete.

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Under-Slab Waterproofing

Jul 16, 2009  The application of vapor retarders in under slab applications should be in compliance with ASTM E 1643, “Standard Practice for Installation of Water Vapor Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs.” The standard requires the application of ¾-inch, single size, graded gravel under the vapor barrier.

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Optimizing Sub-Slab Design and Construction: Water as Both ...

However, any excess bleed water from the concrete (discussed below) or moisture in the base layer still lies above the retarder and will often be driven by a vapor pressure gradient through the slab. To address this issue, some experts have recommended placing the vapor retarder directly beneath the slab.

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True Hydrostatic Pressure Rarely Causes Concrete Moisture ...

Jun 08, 2021  Hydrostatic pressure impacts a below-grade concrete slab when it is below the water table or when the slab intrudes into a natural water pathway. At times, poor drainage may cause water to collect against a concrete foundation. But in most cases, the water will not build up the volume to cause problems from hydrostatic pressure.

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Do I Need a Vapor Barrier Under Concrete Slab?

Heavier vapor barrier material with greater puncture resistance and tensile strength, such as 15-mil polyethylene, has been worming its way under residential concrete slabs. The permeability of 15-mil ranges from 0.0063 to 0.0158 Perms (10x or more than 6-mil), depending on the manufacturer.

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What is the capillary tendency of concrete ...

May 14, 2009  While a typical 8" thick concrete wall will have a perm of about 0.4, it is hardly impermeable to water vapor. But, far more importantly, concrete has very high capillarity (theoretically, can lift water 6 miles!). A sub-slab membrane serves as a capillary break, a vapor

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XPS rigid panels under concrete slab - Fine Homebuilding

Feb 20, 2008  Does concrete act as a vapor retarder to the extent that it actually allows water to pool under the slab before enough is stored to overcome the resistance created by the concrete?"The problem is that slabs are oftne covered with materials that slow or stop the evaporation of the moisture into the air.And with the sand base unit it you start ...

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Removing excessive moisture that is trapped below a slab ...

Jan 06, 2003  cuddlebunny - - - jheidt's and Ron's comments are on target. If there is a large volume of water under the slab and you are sure that no other water in infiltrating the area, core an eight to ten inch hole through the slab and remove enough sand and other subgrade material to install a sump pump wrapped with filter fabric.

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Concrete Vapor Barrier? - Haener Block

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.

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Moisture Mitigation in Concrete Floors Duraamen

Vapor barriers are often used. These are very efficient barrier membranes that do not allow moisture to pass through. This would be used if the problem is water seeping in from below the floor, for instance. Vapor barriers are often placed between a subgrade and a poured concrete slab.

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Vapor barriers under concrete slabs

por barrier directly under a concrete slab aggravates plastic shrinkage cracking (Ref. 1). The PCA tests did show that when a concrete slab was placed directly over a vapor barrier, instead of over a sand layer, water flow from the concrete was greater at early ages (Ref. 2). The researchers believed this was due to more evaporation of the mix ...

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Vapor Retarders Will Stop Odors and Moisture

The concrete walls and floor in your basement and the remaining floor slabs in the house and garage can be sprayed with some unique water based chemicals. These products are basically a liquid water vapor that penetrate into concrete surfaces and block water vapor movement.

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Moisture In Concrete - force

Apr 11, 2018  Water vapor is capable of penetrating where water in a liquid form cannot. By comparing the vapor pressure in differing environments, one can estimate the movement of vapor pressure through concrete. However, in reality, vapor emissions levels are complex due to variations in temperature, humidity, permeability, and flow path through the concrete.

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Hydrostatic Pressure Moisture Vapor - Sika

Concrete moisture vapor emission is a natural constituent of any concrete slab. It may be encountered as the emission of mix water during the drying process of a new concrete slab. Concrete drying creates an emission from the slab regardless of whether the concrete slab is below, on or above grade.

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

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

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What kind of plastic goes under 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. Should you put plastic under concrete? Vapor retarders have been used since the 1950s. Recently, though, research has shown that the old traditional layer of 6-mil Visqueen ...

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Specifying the Concrete Slab to be Polished

Place, protect, and repair sheet vapor retarder in accordance with ASTM E 1643, Standard Practice for Selection, Design, Installation, and Inspection of Water Vapor Retarders Used in Contact with Earth or Granular Fill Under Concrete Slabs, and with manufacturer’s written instructions. Lap joints 150 mm (6 in.) and seal with manufacturer-

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Comparing Vapor Barrier Permeance Concrete Construction ...

Jan 15, 2013  ACI 302.1R-05, “Guide for Concrete Floor and Slab Construction,” repeats what’s in a now outdated version of ASTM E 1745, “Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs,” that a vapor retarder should have a permeance below 0.3 perms as determined by ASTM E 96 ...

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What is the best flooring for a basement cement floor?

May 18, 2021  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.

Get Price

Removing excessive moisture that is trapped below a slab ...

Jan 06, 2003  cuddlebunny - - - jheidt's and Ron's comments are on target. If there is a large volume of water under the slab and you are sure that no other water in infiltrating the area, core an eight to ten inch hole through the slab and remove enough sand and other subgrade material to install a sump pump wrapped with filter fabric.

Get Price

Vapor Retarders Will Stop Odors and Moisture

The concrete walls and floor in your basement and the remaining floor slabs in the house and garage can be sprayed with some unique water based chemicals. These products are basically a liquid water vapor that penetrate into concrete surfaces and block water vapor movement.

Get Price

Concrete Floor Problems Building Science Corporation

May 26, 2008  Note that the polyethylene extends under the grade beam and upwards to grade. Latex paint over the exposed portion of the slab prevents liquid phase water from being absorbed by the concrete—but allows vapor phase water to leave the slab thereby facilitating drying. Also note the capillary break isolating the wood framing from the slab.

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What mil plastic should be used under concrete?

A concrete vapor barrier is any material that prevents moisture from entering a concrete slab. This is why a vapor barrier under concrete is essential. Vapor barriers are a way to keep moisture from getting into the concrete. Do I need a vapor barrier under my concrete slab? Water vapor will always move from a high relative humidity environment ...

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One Concrete Slab, Two Vapor Retarders - GreenBuildingAdvisor

Apr 20, 2021  Since you are pretty confident in the integrity of barrier beneath the slab that means you really only need to worry about water or water vapor getting below the ditra from above. So what I would do is install Kerdi Band (a narrow roll of Kerdi) at the junctions between the

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How can I install Porcelain Tile over a concrete slab with ...

The water can be coming up from under the concrete from the soil if there is a high water table or if water is draining towards the house. If you have cracks in the concrete floor that you want to tile and the cracks have a lot of efflorescence staining then you might need to install a waterproof membrane first or a waterproof mitigation system.

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Protecting ESD Floors from Moisture ESD Flooring ...

This guide includes both quantitative and qualitative procedures used to determine the amount of water or water vapor present in or emitting from concrete slabs and criteria for evaluating the moisture-related acceptability of concrete slabs to receive resilient floor coverings and

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