.jpg)




.jpg)




1 Review
View Product Reviews20mm Celotex TB4020 PIR Insulation Board 2400mm x 1200mm
Coverage required
Nationwide Delivery
Fri 19 Sep
- 0days
- 11hrs
- 49mins
- 59secs
Product Overview
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, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
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 | £15 ex. VAT |
Between £100 - £300 ex. VAT | £10 ex. VAT |
Over £300 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.
Key Features
- {{home}} Use in floors, framed walls and pitched roofs
- {{grade}} Aluminium composite facing on both sides
- {{thermostat}} 0.022 W/mK thermal conductivity
- {{build}} Easy to handle and install
- {{public}} Zero Ozone Depletion Potential (ODP)
- {{verified_user}} BBA certified
Technical Specification
Material Type: | PIR |
---|---|
Thickness: | 20mm |
Width: | 1200mm |
Length: | 2400mm |
Sales Unit: | Board |
Sales Unit Coverage: | 2.88m2 |
Brand: | Celotex |
Manufacturer's Reference: | TB4020 |
Weight: | 2.28kg |
Thermal Conductivity: | 0.022W/mK |
Technical Downloads
Product Overview
Foil-faced PIR insulation board for use in floors, walls, and roofs.
Part of the TB4000 range, it is used to limit thermal bridging at reveals, junctions, and edges where insulation layers are interrupted.
At 20mm thick, this is the slimmest option in the range, suited to over-boarding, detail work, and space-constrained applications.
Features & Benefits
- Thermal conductivity (0.022 W/m·K): Reduces the thickness required to meet U-value targets.
- Low-emissivity foil facings: Reflect radiant heat across unventilated air gaps, cutting thermal transfer at junctions.
- TB4000 range (thermal bridging control): Improves continuity of insulation where up to 30% of fabric heat loss can otherwise occur.
- Rigid PIR core: Lightweight yet robust, easy to cut and install with standard tools.
- Moisture resistance: Closed-cell core prevents water uptake and preserves thermal performance.
- Environmental credentials: Zero ODP, low GWP blowing agent, and BRE Green Guide Rating A.
- BBA certified (17/5405, 16/5352): Independent assurance of performance across roofs, walls, and floors.
- Board size 2400 x 1200mm: Large-format sheets reduce installation time.
- Thickness 20mm: Slimmest PIR option, enabling insulation where space is most limited.
Applications
- Thermal bridging details (reveals, lintels, junctions): Limits cold spots, condensation risk, and heat loss where insulation layers are interrupted.
- Roofs (pitched/flat): Useful for upgrades at rafter lines, perimeter upstands, or overlaying to reduce bridging.
- Walls (timber frame/masonry): Applied at reveals, edges, or internally to improve continuity.
- Floors (beam & block, slab, timber): Commonly used as perimeter upstand insulation or for targeted slab upgrades.
Installation Guidance
- Cut and fit tightly: Use a knife or fine-tooth saw; maintain close joints to avoid thermal bypass.
- Seal or tape as specified: Ensures continuity with air and vapour control layers.
- Protect on site: Store boards flat, dry, and covered until required.
Compliance & Performance
- Thermal conductivity: 0.022 W/m·K (BS EN 12667).
- Compressive strength: ≥140 kPa (BS EN 826).
- Reaction to fire: Euroclass E (BS EN 13501-1).
- Environmental performance: Zero ODP, low GWP, BRE Green Guide Rating A.