Question 1

Can you install LVT, vinyl or carpet over an uneven concrete floor?

Louise · Accepted Answer

Generally, the substrate needs to be sufficiently smooth, stable and suitable for the chosen floor covering. Unevenness, cracks, old adhesive residues and other surface imperfections may show through thinner materials such as LVT and vinyl or affect the installation of carpet. Repairs, smoothing compounds or other preparation may be needed to achieve an appropriate finish.

Question 2

Does a concrete floor need to be completely dry before new flooring is installed?

Louise · Accepted Answer

Concrete and other cementitious substrates need to meet the moisture requirements specified by the flooring and preparation product manufacturers before installation. Excess moisture can affect adhesives, floor coverings and the long-term performance of the finished floor. Appropriate moisture testing helps establish whether the substrate is ready or whether further drying or moisture protection is required.

Question 3

How do you know if a concrete floor needs levelling?

Louise · Accepted Answer

An uneven concrete surface may have visible dips, raised areas, cracks or changes in level. These imperfections can affect the finished appearance of flooring, particularly thinner coverings such as LVT and vinyl. A professional assessment can identify variations in the surface and establish whether repairs, smoothing or a levelling compound are needed before installation.

Question 4

How long does floor preparation take before new flooring can be installed?

Louise · Accepted Answer

The time required depends on the existing floor condition, the preparation work involved and the products being used. Minor repairs and surface smoothing may take less time than extensive levelling or moisture treatment. Some preparation compounds and membranes also require specific curing or drying periods before the new flooring can be installed. The product manufacturer's instructions should always be followed.

Question 5

What is a damp proof membrane (DPM) and when is it needed?

Louise · Accepted Answer

A damp proof membrane is a specialist system used to manage moisture within or passing through a sub-floor. It may be required where moisture testing identifies levels that exceed the permitted limits for the proposed flooring system. The correct solution depends on the substrate, moisture conditions and manufacturer's guidance, so an assessment should be carried out before selecting a suitable membrane.

Question 6

What is floor smoothing compound and when is it needed?

Louise · Accepted Answer

Floor smoothing compound is a specialist preparation material applied to a suitable substrate to create a smooth, even surface before new flooring is fitted. It is commonly used to address minor surface imperfections and provide a suitable finish for resilient floor coverings. The appropriate compound depends on the existing substrate, the flooring specification and the manufacturer's recommendations.

Question 7

What is sub-floor preparation and why is it important before installing new flooring?

Louise · Accepted Answer

Sub-floor preparation involves assessing and treating the existing surface before a new floor covering is installed. This may include cleaning, repairing damaged areas, removing old adhesive, levelling uneven sections and checking moisture levels. Preparing the substrate correctly helps create a suitable base for the new flooring and reduces the risk of problems affecting its appearance or performance.

Question 8

What is the difference between floor screeding and floor levelling?

Louise · Accepted Answer

Floor screeding generally involves applying a cement-based or specialist screed material to create or improve the underlying floor surface. Floor levelling focuses on correcting variations in height and producing an even surface suitable for the chosen floor covering. Self-levelling compounds are often used during preparation, but the correct system depends on the condition and construction of the existing floor.

Question 9

Can you install LVT, vinyl or carpet over an uneven concrete floor?

Louise · Accepted Answer

Generally, the substrate needs to be sufficiently smooth, stable and suitable for the chosen floor covering. Unevenness, cracks, old adhesive residues and other surface imperfections may show through thinner materials such as LVT and vinyl or affect the installation of carpet. Repairs, smoothing compounds or other preparation may be needed to achieve an appropriate finish.

Question 10

Does a concrete floor need to be completely dry before new flooring is installed?

Louise · Accepted Answer

Concrete and other cementitious substrates need to meet the moisture requirements specified by the flooring and preparation product manufacturers before installation. Excess moisture can affect adhesives, floor coverings and the long-term performance of the finished floor. Appropriate moisture testing helps establish whether the substrate is ready or whether further drying or moisture protection is required.

Question 11

How do you know if a concrete floor needs levelling?

Louise · Accepted Answer

An uneven concrete surface may have visible dips, raised areas, cracks or changes in level. These imperfections can affect the finished appearance of flooring, particularly thinner coverings such as LVT and vinyl. A professional assessment can identify variations in the surface and establish whether repairs, smoothing or a levelling compound are needed before installation.

Question 12

How long does floor preparation take before new flooring can be installed?

Louise · Accepted Answer

The time required depends on the existing floor condition, the preparation work involved and the products being used. Minor repairs and surface smoothing may take less time than extensive levelling or moisture treatment. Some preparation compounds and membranes also require specific curing or drying periods before the new flooring can be installed. The product manufacturer's instructions should always be followed.

Question 13

What is a damp proof membrane (DPM) and when is it needed?

Louise · Accepted Answer

A damp proof membrane is a specialist system used to manage moisture within or passing through a sub-floor. It may be required where moisture testing identifies levels that exceed the permitted limits for the proposed flooring system. The correct solution depends on the substrate, moisture conditions and manufacturer's guidance, so an assessment should be carried out before selecting a suitable membrane.

Question 14

What is floor smoothing compound and when is it needed?

Louise · Accepted Answer

Floor smoothing compound is a specialist preparation material applied to a suitable substrate to create a smooth, even surface before new flooring is fitted. It is commonly used to address minor surface imperfections and provide a suitable finish for resilient floor coverings. The appropriate compound depends on the existing substrate, the flooring specification and the manufacturer's recommendations.

Question 15

What is sub-floor preparation and why is it important before installing new flooring?

Louise · Accepted Answer

Sub-floor preparation involves assessing and treating the existing surface before a new floor covering is installed. This may include cleaning, repairing damaged areas, removing old adhesive, levelling uneven sections and checking moisture levels. Preparing the substrate correctly helps create a suitable base for the new flooring and reduces the risk of problems affecting its appearance or performance.

Question 16

What is the difference between floor screeding and floor levelling?

Louise · Accepted Answer

Floor screeding generally involves applying a cement-based or specialist screed material to create or improve the underlying floor surface. Floor levelling focuses on correcting variations in height and producing an even surface suitable for the chosen floor covering. Self-levelling compounds are often used during preparation, but the correct system depends on the condition and construction of the existing floor.

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SUB-FLOOR PREP FREQUENTLY ASKED QUESTIONS

Can you install LVT, vinyl or carpet over an uneven concrete floor?

Does a concrete floor need to be completely dry before new flooring is installed?

How do you know if a concrete floor needs levelling?

How long does floor preparation take before new flooring can be installed?

What is a damp proof membrane (DPM) and when is it needed?

What is floor smoothing compound and when is it needed?

What is sub-floor preparation and why is it important before installing new flooring?

What is the difference between floor screeding and floor levelling?

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