Celotex GA4000

Celotex GA4000 is an easy-to-install general-purpose polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing.

Available in thicknesses from 50mm to 100mm, it can be considered for roof, wall and floor applications.

Applications:

• Pitched Roof: Between and under rafters/loft insulation / between and over rafters / between rafters / pitched roof sarking
• External Walls: Timber frame walls
• Ground Floors: Block & beam / concrete slab / suspended timber
• Flat Roofs: *CELOTEX is not certified as a flat roof insulation board*

*IMPORTANT: Celotex can be used in some flat roof situations, such as in balconies and terraces where slabs will be laid above or between and under joists. Celotex cannot be used directly under a waterproofing membrane as it is NOT CERTIFIED for use as a flat roof board. The compression ratio is not high enough for flat roof applications. Using a CELOTEX board directly under a waterproofing membrane, such as GRP will cause roof failure and will not be guaranteed. Please use boards such as Kingspan TR26 or EcoTherm InnoFix, which are flat roof certified.

Please note: As we utilise local stock across the UK sometimes we may need to send an equivalent PIR board in place of CELOTEX such as Recticel, IKO or Mannok. We will always reach out if we do not have the CELOTEX in your local branch prior to sending the alternative.

Important details about this product:

• Length: 2400mm
• Width: 1200mm
• Material: Polyisocyanurate with low-emissivity foil facing
• BBA Certificates: Certificates 16/5352 (Timber Frame Dwellings), 17/5405 (Pitched Roof, Dry Lining, Floor Insulation)
• BRE Green Guide Rating: A
• Lambda – 0.022W/mK
• Fire Performance – Euroclass F fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.

R-Value by Thickness (m².K/W):

• 50mm: 2.25
• 60mm: 2.70
• 70mm: 3.15
• 75mm: 3.40
• 80mm: 3.60
• 90mm: 4.05
• 100mm: 4.50

Maximum Weight by Thickness (kg/m²):

• 50mm: 1.92
• 60mm: 2.26
• 70mm: 2.61
• 75mm: 2.78
• 80mm: 2.96
• 90mm: 3.31
• 100mm: 4.15

Key Feature & Benefits:

• Thermal Performance – Excellent thermal performance with a thermal conductivity of 0.022 W/mK, reducing the thickness of insulation required to hit the target U-value.
• High Performance Facer – Low-emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value.
• Easy to Install – Celotex boards are light and rigid, assisting with ease of transportation, handling and fitting.
• BBA Certified – Celotex  GA4000 has been assessed by the BBA as fit for use in defined roof, wall and floor applications if installed, used and maintained as set out in the certificate. Please read the certification at insulation-UK.com/BBA for full details and restrictions.
• Sustainability – Celotex GA4000 achieves a BRE Green Guide Rating of A, which can assist in demonstrating environmental performance in your BREEAM assessments. Please visit the Celotex page at GreenBookLive.com for further details.

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.