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Kingspan Kooltherm K103 Floorboard

SKU: KS-K103-BASE

Premium performance phenolic floor insulation.

New BuildRenovationExtensionLoft ConversionCommercialBest Seller
25mm: 25mm
£35.00inc. VAT
£29.17 ex. VAT · 12 per pack
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Kingspan Kooltherm K103 Floorboard

Kingspan Kooltherm K103 is a premium performance insulation board with a fiber-free rigid thermoset phenolic core and a glass tissue based facing on both sides.

Key Features

  • Industry-leading thermal conductivity of 0.019 W/mK
  • High compressive strength (120 kPa) - ideal for floor applications
  • Fiber-free phenolic core for cleaner installation
  • BBA certified for Building Regulations compliance
  • Zero ODP and low GWP blowing agent

Applications

K103 is specifically designed for ground floor and underfloor heating applications. Its exceptional thermal performance means you can achieve required U-values with thinner boards, saving valuable space in your build.

Suitable For:

  1. Solid concrete floors with screed
  2. Suspended beam and block floors
  3. Underfloor heating systems
  4. New builds and refurbishment projects

Installation Guide

Install K103 directly on a dry, level concrete slab. Ensure all joints are tightly butted and tape with Kingspan Foil Tape for a continuous vapour barrier.

Technical Specifications

Thermal Conductivity0.019 W/mKPremium Grade
Compressive Strength120 kPaHigh Load
Board Size1200 x 600 mmStandard
Fire PerformanceClass EEN 13501-1

For technical support or volume quotations, contact our insulation specialists today!

Frequently Asked Questions

Yes, Kingspan Kooltherm K103 is specifically designed for use with underfloor heating systems. Its high compressive strength (120 kPa) can support the weight of the screed and floor finish. The excellent thermal performance (0.019 W/mK) ensures maximum heat is directed upwards into the room, improving system efficiency.
For ground floors in new builds, you typically need 100mm of Kingspan Kooltherm K103 to achieve the required U-value of 0.13 W/m²K or better. However, exact requirements depend on floor construction, ground conditions, and edge insulation. Use the Kingspan U-value calculator or consult with your building control officer for precise specifications.
Yes, K103 can be laid directly on a concrete slab. Ensure the concrete is dry, level and free from debris. A damp proof membrane (DPM) should be installed either below or above the insulation depending on your construction detail. Joints should be taped with foil tape to maintain the vapour barrier.
Standard delivery is 2-5 working days for most products. Express delivery (next day or 1-2 days) is available for orders placed before 2pm on selected products. Large orders or specialist items may require additional lead time. Delivery times are shown at checkout based on your location and product availability.
Unused products in original packaging can be returned within 30 days of delivery for a full refund. A restocking fee of 15% may apply to large orders. Custom-cut or special order items cannot be returned unless faulty. Contact our customer service team to arrange a return.
Yes, the majority of our insulation products carry BBA (British Board of Agrément) certification, which confirms they meet quality and performance standards. BBA certification numbers are listed in the product specifications. This certification is often required for building control approval.
Yes, most insulation boards can be easily cut on site using a sharp knife, handsaw, or specialized insulation cutting tools. For PIR and phenolic boards, score deeply with a sharp knife and snap. For mineral wool, use a long-bladed knife. Always wear appropriate PPE including dust mask and gloves when cutting insulation materials.
For new builds in the UK, Building Regulations (Part L) typically require: Floors - R-value of 4.0-4.5 m²K/W, Walls - R-value of 5.0-5.5 m²K/W, Roofs - R-value of 6.0-7.0 m²K/W. However, requirements vary by project type and location. Always consult with your building control officer or a qualified professional for specific requirements.
PIR (Polyisocyanurate) insulation has a higher thermal performance per unit thickness compared to EPS (Expanded Polystyrene). PIR typically achieves lambda values around 0.022 W/mK, while EPS is around 0.038 W/mK. This means PIR can achieve the same thermal performance with thinner boards, saving space. However, EPS is generally more cost-effective for less demanding applications.

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