.jpg)
.jpg)
.jpg)
1 Review
View Product Reviews100mm Kingspan Kooltherm K103 Floor Insulation Board 2400mm x 1200mm
| 6+ boards | 12+ boards | 15+ boards |
| £109.63ex. VAT | £109.08ex. VAT | £104.67ex. VAT |
Coverage required
Rigid phenolic floor board with glass-tissue facings for superior thermal performance. For concrete slabs, beam and block, and suspended timber floors. 100mm thickness suits new builds.
Nationwide Delivery
Fri 28 Nov
- 0days
- 21hrs
- 6mins
- 10secs
Learn more
Pay in 3 interest-free payments
Split your purchase of £110.18 into 3 with no sign-up fees or late fees.
£110.18
today
£110.18
1 month
£110.18
2 months
How it works
- Choose PayPal at checkout to pay later with Pay in 3.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Pay in 3 is a form of credit, so carefully consider whether the purchase is affordable and how you will make the repayments. Be aware of the possible impact of using Pay in 3 and of missing payments, including making other borrowing more difficult or more expensive. Pay in 3 eligibility is subject to status and approval. 18+ UK residents only. Available for purchases of £30 to £2,000. Terms and conditions apply. PayPal Pay in 3 is a trading name of PayPal (Europe) S.à r.l. et Cie, S.C.A. 22-24 Boulevard Royal L-2449, Luxembourg.
Learn more
Buy now. Pay with Klarna at your own pace.
Get what you need for your next project, choose how you pay.
Pay in 30 days
£110.18
Pay in full
Klarna's Pay in 30 days is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
Pay over time
£110.18
Every 30 days
Pay in 3
£110.18
today
£110.18
in 30 days
£110.18
in 60 days
Klarna's Pay in 3 is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
How it works
- At checkout select Klarna.
- Choose your payment plan.
- Different payment plans may be shown depending on the purchase amount and credit score.
- Complete your checkout.
- The amount will be charged based on the payment plan you chose.
Learn more
Pay in 4 interest-free payments
Split your purchase of £110.18 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
£82.64
today
£82.64
second payment
£82.64
third payment
£82.64
fourth payment
How it works
- Choose Clearpay at checkout to pay later with Pay in 4.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Clearpay is unregulated credit. Use responsibly. 18+, T&Cs and late fees apply at clearpay.co.uk/en-GB
Clearpay lends you a fixed amount of credit so you can pay for your purchase over 4 instalments, due every 2 weeks. Ensure you can make repayments on time. You must be 18+ and a permanent UK resident (excl Channel Islands). Clearpay charges a £6 late fee for each late instalment and a further £6 if it’s still unpaid 7 days later. Late fees are capped at £6 for orders under £24 and the lower of £24 or 25% of the order value for orders over £24. Missed payments may affect your ability to use Clearpay in the future and your details may be passed onto a debt collection agency working on Clearpay’s behalf. Clearpay is credit that is not regulated by the Financial Conduct Authority. T&Cs and other eligibility criteria apply at clearpay.co.uk/terms
Product Overview
Rigid phenolic floor board with glass-tissue facings for superior thermal performance. For concrete slabs, beam and block, and suspended timber floors. 100mm thickness suits new builds.
Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, EH, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, SA, SY & TD
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £100 | £20 ex. VAT |
| Over £100 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Technical Specification
| Product: | K103 |
|---|---|
| Material Type: | Phenolic |
| Thickness: | 100mm |
| Width: | 1200mm |
| Length: | 2400mm |
| Pieces Per Pack: | 3 |
| Sales Unit: | Board |
| Sales Unit Coverage: | 2.88m2 |
| Brand: | Kingspan |
| Weight: | 10.48kg |
| Thermal Conductivity: | 0.018W/mK |
| Facing: | Glass Tissue |
| Application: | Insulation for Floors |
| Status: | Non-Returnable |
Technical Downloads
Product Overview
Kingspan Kooltherm K103 Floor Insulation Board in a 100mm thickness.
This board delivers premium thermal performance for ground-floor constructions. The fibre-free phenolic core achieves a low thermal conductivity of 0.018 W/m·K, supporting strong energy retention in concrete slabs, screeded floors, and suspended timber systems.
The board is faced on both sides with a durable glass-tissue layer autohesively bonded to the core, providing a stable surface compatible with common floor build-ups. Its closed-cell structure resists air infiltration and water vapour passage, ensuring consistent long-term performance within the floor assembly.
A minimum compressive strength of 120 kPa at 10% compression accommodates typical domestic and commercial floor loading when used beneath unreinforced screeds. Its lightweight construction helps reduce site disruption by limiting soil removal and simplifying service routes during floor preparation.
Handling, cutting, and placement remain straightforward in both new-build and refurbishment settings, with the material offering a non-deleterious insulation option produced using a zero-ODP, low-GWP blowing agent.
Manufactured with a 100mm thickness, it provides a deep insulation option suited to floor constructions targeting high levels of thermal efficiency.
Features & Benefits
- Premium phenolic insulation: Provides a rigid thermoset phenolic core for high thermal efficiency in ground-floor applications.
- Low thermal conductivity: Achieves a conductivity of 0.018 W/m·K to support strong energy retention across the floor area.
- Air infiltration resistance: Remains unaffected by air movement within the floor assembly for stable thermal performance.
- Water vapour resistance: Offers reliable resistance to water vapour passage to support long-term floor integrity.
- Reduced site preparation: Can help limit soil removal and simplify service routing during ground-floor construction.
- Durable formulation: Provides a non-deleterious material that maintains performance when correctly installed.
- Sustainable manufacture: Produced using a blowing agent with zero ODP and low GWP for responsible specification.
- Easy installation: Lightweight and easy to cut for precise fitting in both new-build and refurbishment settings.
- Thickness specification: 100mm thickness suited to deep floor build-ups and installations requiring high thermal performance.
Applications
- Concrete floors: Suitable for insulation beneath slabs and screeds in domestic and commercial buildings.
- Suspended timber floors: Appropriate for improving thermal performance in timber-based floor constructions.
- Refurbishment projects: Applicable across upgrade works requiring enhanced ground-floor thermal performance.
- Perimeter detailing: Compatible with perimeter upstand insulation to reduce heat loss at wall-to-floor junctions.
Installation Guidance
- Substrate preparation: Ensure the supporting base is clean, level, and protected by an effective damp proof membrane.
- Board arrangement: Lay boards tightly with staggered joints to minimise thermal bridging across the floor.
- Perimeter treatment: Install suitable upstand insulation to improve wall-to-floor junction performance.
- Load application: Apply screed or slab layers in accordance with the chosen floor design and load requirements.
- Accurate cutting: Cut panels cleanly using a fine-toothed saw to achieve a precise and stable installation fit.
Compliance & Performance
- Material specification: Manufactured from a fibre-free rigid thermoset phenolic core with glass-tissue facings.
- Thermal performance: Provides a low thermal conductivity of 0.018 W/m·K for efficient floor insulation design.
- Compressive strength: Minimum compressive strength of 120 kPa at 10% compression suitable for typical floor loading.
- Environmental management: Produced under ISO 9001, ISO 14001, BS OHSAS 18001, and ISO 50001 certified systems.
- Moisture considerations: Must be installed above a damp proof membrane and not used in direct contact with subsoil.
- Durability: Offers long service life when protected within the floor assembly and supported by suitable construction.
- Important note: Handle with standard site PPE, avoid solvent-based adhesives containing methyl ethyl ketone, and ensure boards are protected from harsh solvents or acids before installation.
