When it comes to installing underfloor heating, ensuring a solid foundation is crucial. A high-quality liquid damp proof membrane (DPM) is necessary if no DPM is present. But what is liquid DPM, and how do you choose the right one for your concrete floors? We will break down exactly what a liquid DPM is, why you would use liquid DPM for concrete floors and the best liquid DPM options available for your concrete floors.

What is Liquid DPM?

Liquid DPM, or Liquid Damp Proof Membrane, is a protective layer applied to concrete floors to prevent moisture ingress. It creates a barrier that stops water from penetrating the surface, safeguarding your flooring and any underfloor heating systems you install, whether you are installing electric underfloor heating or water underfloor heating systems. This is especially important in environments prone to dampness, as excess moisture can lead to significant damage and inefficiencies.

Choosing the right liquid DPM is essential for ensuring the longevity and efficiency of your underfloor heating system. At Warm Floor Store, we offer a range of high-quality liquid DPM options tailored to meet various project needs.

Read more: Electric UFH vs. Water UFH: Choosing the Right Underfloor Heating System

Why Use Liquid DPM for Concrete Floors?

Using liquid DPM for concrete floors is essential for several reasons:

• Moisture Protection: It prevents moisture-related issues that can compromise your flooring and heating systems.

• Easy Application: Liquid DPM products are straightforward to apply, making them suitable for homeowners completing their own renovations and also professional tradesmen. 

• Compatibility: Most liquid DPMs are compatible with various flooring materials, ensuring versatility in your project.

Read more: Does Underfloor Heating Work With Wooden Floors? 5 Myths Debunked

The Best Liquid DPM Options

Here are our top picks for liquid DPM products that stand out for their effectiveness and ease of use:

1. Tilemaster Fast One Coat DPM
   Tilemaster Fast One Coat DPM is an exceptional product designed for rapid application. This liquid DPM is perfect for those who want a fast-curing solution. With its single-coat application, it saves time while providing reliable moisture protection. Ideal for concrete floors, it allows for quick installation of underfloor heating systems, ensuring that your project stays on schedule. The Tilemaster DPM is available in 3 sizes, 3kg, 7kg and 14kg.

   Advantages

   Suitable Substrates

   Fast curing - ready to tile or receive smoothing compounds in 4 - 5 hours 2 Component, solvent-free, One Coat DPM Suitable for use on surfaces with a moisture reading of up to 98% Relative Humidity (RH) Can be installed where no structural DPM is present (2 coats) Suitable for use over underfloor heating systems Ideal for use on Anhydrite/Calcium Sulphate screeds Supplied in convenient easy to use packaging

   Concrete Sand/Cement Screed Water/Wet System Underfloor Heating Existing Ceramic, Porcelain and Natural Stone Tiles Flooring Grade Asphalt & Bitumen Anhydrite/Calcium Sulphate Screeds Tile Backer Boards

   

2. Ardex DPM One Coat Damp Proof Membrane

   Another excellent option is Ardex DPM One Coat Damp Proof Membrane. This liquid epoxy DPM offers a robust barrier against moisture and is easy to apply, making it a favourite among contractors. Its advanced formula ensures durability, providing long-lasting protection for your concrete floors.

   ARDEX DPM 1 is suitable for heated concrete and cement/sand screeds. The surface temperature should not exceed 27°C in accordance with BS 8203 and BS 5325.

   

3. Mapei Mapeproof One Coat Two-Component DPM

   For those seeking a high-performance solution, Mapei Mapeproof One Coat Two-Component DPM is an outstanding choice. This liquid epoxy DPM is designed to provide superior protection against moisture, making it ideal for areas prone to dampness. Its two-component formula ensures a strong, lasting bond, which is critical for effective moisture control in concrete floors.

   Mapeproof One Coat is not recommended for heated subfloors where wood floor coverings are to be installed. Apply over mechanically prepared power-floated concrete subfloors that incorporate an effective structural DPM, to control residual or constructional moisture.

   

4. Ultra Floor DPM IT Two-Part Rapid Curing Primer Membrane

   Lastly, consider Ultra Floor DPM IT Two-Part Rapid Curing Primer Membrane. This liquid DPM is engineered for rapid curing, allowing you to proceed with your flooring installation in no time. Its high-performance formulation provides an effective moisture barrier, ensuring that your concrete floors remain dry and stable.

   It is suitable for use as a DPM to suppress residual moisture in concrete and sand/cement screeds where the moisture levels are 98% RH or less when tested with a properly calibrated surface hygrometer in accordance with BS 8203.

   

How to Apply Liquid DPM

Knowing how to apply liquid DPM correctly is essential for achieving the best results. Here’s a simple guide to get you started:

• Surface Preparation: Ensure your concrete floor is clean, dry, and free from any contaminants. This will help the DPM adhere properly. You might also want to use a floor primer if recommended on your datasheet. Make sure you follow the manufacturer’s guidelines for the type of primer suitable for the surface material.

• Mixing: If you're using a two-component DPM, follow the manufacturer's instructions for mixing.

• Application: Using a roller or brush, apply the liquid DPM evenly across the surface. Ensure a continuous layer without gaps.

• Curing Time: Allow the DPM to cure as per the product instructions. This can vary, so check the manufacturer's guidelines for specifics on how long liquid DPM takes to dry.

Choosing the right liquid DPM for your concrete floors will ensure the success of your underfloor heating project. Products like Tilemaster FAST One Coat DPM, Ardex DPM, Mapei Mapeproof One Coat Two Component DPM, and Ultra Floor DPM provide excellent moisture protection, ensuring your floors remain dry and effective. By understanding what liquid DPM is and how to apply it, you will be able to pick the best liquid DPM for concrete floors and begin your project. For further assistance, contact our experienced sales team on 0330 320 9900 or [email protected].