Kingspan Kooltherm K103 Floor Insulation Board

Kooltherm K103 is an advanced floor insulation solution for use with solid concrete or suspended timber floors. It has a thermal conductivity of 0.019 W/mK and is ideal for both new build and refurbishment projects.

Applications:

• Pitched Roof - Under Rafters.
• Flat Roofs - Under Joists.
• External Walls - Timber Frame Walls, Upgrading Cavity Walls / Solid Walls.

Important details about this product:

• Length: 2400mm
• Width: 1200mm
• Thickness: From 50mm up to 150mm
• Fire Classification: Euroclass C-s2,d0 when classified to EN 13501-1: 2018
• Lambda: – 0.019W/mK
• Weight: Approximate weight of 3.70 kg/m² at a thickness of 100 mm.
• Compressive strength: Typically exceeds 120 kPa at 10% compression.
• Material: Phenolic Foam & Glass tissue-based facing autohesively bonded to the insulation core during manufacture.
• Unit: Sold in packs

Key Features & Benefits:

• Excellent thermal performance with a thermal conductivity of 0.019 W/mK, reducing the thickness of insulation required to hit the target U-value
• One of the thinnest commonly used insulations for floors, allowing U-values to be reached with minimal thickness
• Can reduce the cost of related items – soil removal, service connections
• Suitable for use in underfloor heating systems
• Certified to BES6001(Framework Standard for the Responsible Sourcing of Construction Products) ‘Very Good’
• Lightweight insulation that is easy to transport, handle and install
• Part of our Kingspan Range of advanced insulation

Kingspan Kooltherm K103 Pack Sizes & Coverage:

• 25mm – 12 Sheets – 34.56sq.m
• 40mm – 8 Sheets – 23.04sq.m*
• 50mm – 6 Sheets – 17.28sq.m
• 60mm – 5 Sheets – 14.4sq.m
• 70mm – 4 Sheets – 11.52sq.m
• 75mm – 4 Sheets – 11.52sq.m
• 90mm – 3 Sheets – 8.64sq.m
• 100mm – 3 Sheets – 8.64sq.m
• 150mm – 2 Sheets – 5.76sq.m

*Special Order

Do you offer Free Delivery?

Yes! On most insulation orders over £400 excluding VAT, we can offer free delivery*. 

Delivery depends on stock availability and location. If stock is not available at your local branch and must be delivered from another branch, this may affect lead time or delivery charges. In this case, one of our advisors will contact you to confirm any changes. 

You can also send your enquiry via Contact Page or WhatsApp, and we will calculate the costs for you. We always aim to have your order travel the shortest distance possible to ensure free or the most economical delivery option. 

Orders below £400 excluding VAT are usually subject to a delivery fee of £50 excluding VAT. 

*Orders into central London (inside the North Circular and South Circular) will be charged on orders up to £1,000 + VAT due to increased shipping costs and congestion charges. Orders must also be above £350 + VAT to be processed.

Where do you deliver to?

We can deliver to 95% of the UK, using our branches across England, Wales, and Scotland. To check if you are in our delivery area, see the map or your postcode. 

London postcodes: BR, CR, DA, E, EC, EN, HA, IG, KT, N, NW, RM, SE, SM, SW, TW, UB, W, WC, WD. 

Other postcodes: AL, B, BA*, BB, BD, BH*, BN, BS, CA, CB, CM, CO, CT, CV, CW, DA, DD*, DE, DG*, DH, DL, DN, DT*, DY, EH*, EX*, FK*, FY, G, GL*, GU, HD, HG, HP, HU, HX, IP, KA*, KY*, L, LA, LE, LL, LN, LS, LU, M, ME, MK, ML, NE, NG, NN, NR, OL, OX*, PA*, PE*, PH*, PL*, PO*, RG, RH, RM, S, SG, SK, SL, SN*, SO, SP*, SR, SS, ST, SY, TA*, TD*, TF, TN, TQ*, TS, WA, WF, WN, WR, WS, WV, YO. 

Limited areas (PO – Mainland only; BA, BH, DD, DG, DT, EX,  EH, FK, GL, KA, KY, OX, PA, PE, PH, PL, SN, SP, TA, TD, TQ & PL) may have restricted delivery coverage depending on distance from the branch and order size.

Where will you deliver my order to?

All deliveries are kerbside only. It is your responsibility to move items from the kerb onto your property. The courier decides where the order is left, so please ensure there is ample space to offload.

Delivery access and site restrictions

These items are typically delivered on large 18T or 26T rigid lorries, approximately 10–12 meters long, 4 meters high, 2.6 meters wide, carrying 12–14 pallets.

Please inform us of any access restrictions or site issues in advance; failure to do so may result in extra delivery charges.

When do you dispatch orders?

If your order is placed before 12:00 PM, we aim to process and dispatch it on our lorries the next working day. Occasionally, lorries may be full, or stock may need to be brought in from another branch, which can extend delivery up to 10 working days. Some areas are subject to set delivery days due to distance from the local branch.

Please ensure to leave a mobile number so that we can contact you with your delivery date once we have received confirmation from the local branch. This also allows ourselves or the delivery driver to contact you if there are any issues with your delivery.

Why do we need your contact number?

It is essential to provide a mobile number so we or the delivery driver can contact you if there are any issues. For orders of this nature, we may contact you after ordering online to discuss delivery options, site restrictions, or offloading requirements.

How much will my delivery cost?

For orders over £400 excluding VAT, we can offer free delivery*. 

Delivery costs vary depending on the product and delivery location. When you add items to your basket and proceed to checkout, the delivery price will be displayed. We keep delivery costs as low as possible and only pass on the rates charged by our delivery partners.

How long will my delivery take?

Each product page shows the usual lead time below the “Add to Basket” button. These times are a guide only, and we aim to deliver your items as quickly as possible.