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Preparing Gypcrete for Flooring Installation

Flooring underlayment conceals imperfections in subfloors, providing a smooth, flat surface for the floor covering. They also help with sound control and prevent moisture from coming through and damaging your finished floor. Gypcrete is a lightweight floor underlayment used in construction projects for its sound dampening, low thermal conductivity, and fire resistance properties. When properly installed, it creates a stable, high-performance base for flooring materials, including hardwood, laminate, and tile.

Gypsum concrete can be used in residential homes, multi-story buildings, and commercial properties. This post will cover how to prepare gypcrete for floor installation.

What Is Gypcrete?

Also known as gypsum concrete, gypcrete is a type of floor underlayment consisting of gypsum (calcium sulfate dihydrate) as the primary ingredient and other additives. It combines gypsum plaster, cement, sand, and additives like fiber and polymers. The gypsum plaster is relatively lightweight, which makes it easy to work with the gypcrete.

Gypsum concrete is used in residential and commercial building projects to provide a base for flooring materials. Many designers and architects prefer it for its unique properties, including self-leveling, fire resistance, and sound-absorption qualities. Because of its excellent sound-dampening qualities, gypsum concrete can be used as soundproofing material in walls and ceilings to reduce noise transmission.

Installing gypsum concrete involves pouring the mixture over a prepared subfloor. Gypcreteprovides a smooth, solid surface for installing flooring materials when properly installed.

When buying gypsum concrete underlayment, you should check to confirm that they meet strict sound and fire attenuation codes.

How To Prepare Gypcrete Underlayment for Flooring Installation

Gypsum concrete is widely used for floor underlayment because of its ability to provide noise resistance, vital to comfortable living in multi-family properties, and fire rating. It also has low thermal conductivity, which can enhance energy efficiency and improve insulation. Preparing your underlayment before flooring installation can provide a solid foundation for your floor.

To prepare gypcrete, inspect the surface for cracks, damage, and uneven areas. You can fill small cracks and imperfections using high-quality gypcrete-specific repair products. Otherwise, a professional can help you address significant gaps or structural issues.

While gypsum concrete is known for its self-leveling properties, you must address noticeable uneven areas. A licensed applicator or contractor can help you determine the best approach to achieve evenness. Applicators follow strict quality control guidelines to apply floor underlayments best, creating high-quality surfaces for finished floors. After completing the necessary renovations, allow the underlayment to dry and cure fully.

Next, clean the underlayment to remove dust and debris and apply a primer designed for gypsum concrete to promote adhesion. Although gypsum concrete can block moisture, you may need to install a vapor barrier on the primed surface, depending on your area’s flooring type and moisture conditions.

Once the underlayment is dry, you can install your flooring. You can install the flooring yourself, referring to the manufacturer’s guidelines, but it’s advisable to let a professional do the installation.

Gypsum concrete floor underlayment is designed for use in multi-family and commercial buildings to help with sound control and fire codes.

Sound Control Mats

Sound control mats are used with concrete to provide additional impact noise control. They are ideal when gypsum concrete pour is not sufficient. When properly installed, you help maximize sound control, especially in tight spaces. There are different types of sound control mats with different thicknesses, which you can use be a perfect underlayment, depending on your specific needs.


Properly installed gypsum concrete provides a level, smooth, and crack-resistant monolithic base for finished floors. Its excellent sound-dampening and fire-resistance properties offer an easy way for contractors to meet sound and fire attenuation codes. While you can install gypsum concrete floor underlayment, it is recommended to hire a licensed applicator for the best results.

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