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    115mm Celotex Thermaclass 21 Cavity Wall Insulation – 2.67m2 pack

    Product code: 800946
    115mm Celotex Thermaclass 21 Cavity Insulation - 2.67m2 pack

    115mm Celotex Thermaclass 21 Cavity Wall Insulation – 2.67m2 pack

    Product code: 800946

    £123.75£148.50 ex VATinc VAT

    In stock

    Est. Delivery: 3 - 5 working days * (View Delivery Policy)

    115mm PIR Insulation Board ideal for full fill cavity wall applications leaving a 10mm residual cavity

    2% discount on orders over £2000 (+ VAT) with code: TAKE2
    EAN: 2000000096810 SKU: 800946 Category:
    Specification
    Product code800946
    EAN2000000096810
    Product Type PIR Insulation
    Dimensions 115x450x1190MM (0.535 M²)
    Brand Celotex
    Range CW4000
    Thickness 115mm
    Length 1200mm
    Material PIR
    Application Cavity Wall
    Description

    115mm Thermaclass Cavity Wall 21 is a rigid polyisocyanurate (PIR) insulation solution from Celotex for masonry full fill cavity wall applications. Featuring a tongue and groove edge profile, Thermaclass Cavity Wall 21 has an excellent thermal performance of 0.021 W/m.K (lambda 21) which can help to achieve lower U-values without increasing the overall wall thickness. For wall constructions featuring a 10mm residual cavity, the low-emissivity foil facing increases the thermal performance in sealed cavity air spaces, improving the achievable U-value. Thermaclass Cavity Wall 21 has been assessed by the British Board of Agrément (BBA) as fit for use in defined full fill cavity wall applications if installed, used and maintained as set out in the certificate.

    • Board size: 1190 x 450mm
    • Thickness : 115mm
    • Lambda: 0.021 W/mK
    • Facer: Low emissivity foil facings
    • 5 Boards per pack
    • 16 packs per pallet = 42.8m2

    Please note : Due to recent national shortages of PIR insulation, We now offer Celotex, Ecotherm, Recticel and Iko to help to offer a speedy delivery. You may be offered an alternative brand due to local stock availability.

    Delivery
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    Seasonal Delivery Update

    • Last orders for delivery before Christmas - cut off at 2pm on 17th December 2025. Any orders placed after will be processed on 5th January 2026.
    • Last delivery date before Christmas - 22nd December 2025 (subject to availability)
    • We will be closed from 22nd December and re-open on 5th January 2026.
    Delivery times
    We may be able to deliver sooner than advertised however, please allow for the delivery times listed on the products you have selected to save disappointment. We will email you to confirm your delivery date. Please keep an eye out for the email that will also have your VAT receipt. E.g. 3 – 5 Working days for delivery. If an order is processed on a Monday, 3 working days would be Thursday and 5 working days would be the following Monday. During checkout, you will have the option to select your preferred delivery date at checkout. Please allow a minimum of the working days noted on the products you are buying. All products have their delivery time in working days, on the product page for delivery. Orders placed after 2pm may be processed on the following working day.
    Contact us if you live outside of our standard delivery areas
    The below postcodes are excluded from our standard delivery area: KW, AB, DD, PH19-PH48, ZE, BT, KW, IV, HS, IM, JE, GY, LL, KA, PA, PH, HS, DG9, DG8, SY14-SY25, PO30-PO41, LA11-LA22, CA6-CA28, SA Please email us to request a quote to deliver to your area.
    More details
    For more details, please visit our Delivery Information page, or feel free to contact us.

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