Underfloor heating is rapidly becoming a staple in modern homes across the UK, offering a luxurious, energy-efficient alternative to traditional radiators. However, achieving a flawless and effective underfloor heating system depends on more than just the pipes or electric mats—it requires the right floor build-up. One essential component in wet (water-based) underfloor heating systems is the screed. To make installation easier and more efficient, many suppliers now offer underfloor heating screed kits. But what are they, and why should you consider using one?

This guide will walk you through everything you need to know about underfloor heating screed kits, including their benefits, components, and tips for selecting the right one.

What Is a Screed Kit?

A screed is a layer of material, typically cement or anhydrite, poured over underfloor heating pipes to create a level surface and help distribute heat evenly across the floor. A screed kit provides all the essential components you need to install the screed over your underfloor heating system, packaged together for convenience and consistency.

Screed kits are designed to be used with wet underfloor heating systems, where pipes carrying warm water are embedded in the floor structure. The screed covers the pipes and helps conduct heat upward, creating a smooth, heated surface ready for final floor finishes such as tiles, wood, or carpet.

What's Included in a Screed Kit?

Although the contents of a screed kit may vary slightly depending on the supplier, most kits will typically include:

  • Pre-measured screed compound (cement-based or liquid/anhydrite)

  • Fibre reinforcement (for added strength and reduced risk of cracking)

  • Primer or bonding agent (to ensure proper adhesion to the base)

  • DPM (Damp Proof Membrane) if required

  • Instructions and guidelines for mixing, pouring, and curing

Some premium kits may also include insulation boards, edge insulation strips, or mesh reinforcement for added durability and thermal efficiency.

Why Use a Screed Kit?

There are several advantages to using a dedicated screed kit when installing your underfloor heating system:

1. Convenience

Screed kits simplify the ordering process by bundling together everything you need. Instead of calculating and purchasing each component separately, you get a complete solution tailored to your floor area.

2. Time-Saving

Having a ready-to-go kit speeds up the installation process. Most kits are easy to mix and pour, and with clear instructions provided, you can avoid delays or costly errors.

3. Consistency

Pre-measured materials ensure a consistent mix ratio, which leads to better performance and durability. This helps prevent problems like cracking, uneven curing, or poor heat transfer.

4. Optimised for Underfloor Heating

Screed kits are specially formulated to work with underfloor heating systems, offering better thermal conductivity, quick drying times, and resistance to shrinkage.

Types of Screed for Underfloor Heating

Understanding the different types of screed available will help you choose the right kit for your project:

Traditional Sand and Cement Screed

  • Made from a mix of sand, cement, and water

  • Typically 65–75mm thick

  • Affordable and widely used

  • Slower drying time (approx. 1mm per day)

Liquid Screed (Anhydrite or Flow Screed)

  • Self-levelling, pumpable liquid screed

  • Thinner layer (around 40–50mm)

  • Excellent thermal conductivity

  • Fast drying and minimal shrinkage

Fibre-Reinforced Screed

  • Traditional screed enhanced with synthetic fibres

  • Reduces the risk of cracking

  • More robust, especially for high-traffic areas

When selecting a kit, choose a screed type that aligns with your floor height requirements, project timeline, and budget.

Installation Tips for Screed Kits

Proper installation is critical to the performance and longevity of your underfloor heating system. Here are a few tips to ensure a successful screed installation:

  1. Prepare the Subfloor: Clean, level, and ensure it's free of dust or debris. Lay a damp-proof membrane if needed.

  2. Install Insulation: Use insulation boards or rolls beneath the heating pipes to prevent heat loss downwards.

  3. Fix the Pipes Securely: Use fixing clips or rail systems to hold the heating pipes firmly in place before pouring the screed.

  4. Prime the Surface: If included in the kit, apply a primer to improve bonding and reduce air bubbles.

  5. Mix According to Instructions: Follow the supplier's guidelines exactly to achieve the right consistency and performance.

  6. Allow Proper Drying Time: Do not switch on the underfloor heating until the screed has fully cured—typically 7–28 days depending on the type.

Choosing the Right Screed Kit Supplier

When purchasing a screed kit, consider the following:

  • Product Quality: Ensure the materials meet BS standards and are suitable for use with underfloor heating.

  • Technical Support: Choose a supplier that offers technical advice, installation support, and aftercare.

  • Customisation: Look for suppliers that tailor kits based on your floor size and heating system requirements.

  • Delivery Options: A reliable supplier should offer fast, safe delivery with clear packaging and labelling.

Final Thoughts

Underfloor heating screed kits are an ideal solution for homeowners and installers looking for a streamlined, reliable way to complete their wet underfloor heating projects. With everything you need in one package plus guidance on mixing, pouring, and curing—you can ensure a safe, efficient, and high-performing floor.

Whether you're managing a new build or retrofitting a single room, investing in a quality screed kit will not only save time and effort but also help maximise the comfort and efficiency of your underfloor heating system.