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2 Reviews
View Product Reviews100mm Celotex CW4100 Cavity Wall Insulation Board 1200mm x 450mm (3.24m2/Pack)
| 10+ packs | 15+ packs | 20+ packs |
| £48.99ex. VAT | £48.77ex. VAT | £48.51ex. VAT |
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Wed 29 Jan
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Pay in 4 interest-free payments
Split your purchase of £49.25 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
£12.31
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£12.31
second payment
£12.31
third payment
£12.31
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 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
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Pay in 3 interest-free payments
Split your purchase of £49.25 into 3 with no sign-up fees or late fees.
£16.42
today
£16.42
1 month
£16.42
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.
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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
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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.
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£16.42
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Pay in 3
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£16.42
in 30 days
£16.42
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.
Product Overview
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Klarna's Pay in 3 / Pay in 30 days are unregulated credit agreements. 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. Late fees may apply. Ts&Cs apply
Clearpay is unregulated credit. Use responsibly. 18+, T&Cs and late fees apply at clearpay.co.uk/apply
Delivery & Returns Information
All delivery charges are shown in your basket and are dependent on the total value of items in your basket based on product category.
This charge is based on delivery to mainland UK excluding the following postcodes: AB, DD, KW, IV, LD, LL, PH, SA and SY. If your delivery address is in any of these postcode areas a member of our customer service team will contact you prior to processing your order should an additional delivery charge apply. We do not offer deliveries outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | ||
|---|---|---|
| ORDER VALUE | DELIVERY CHARGE | |
| Under £150 | £50 ex. VAT | |
| Between £150 - £400 ex. VAT | £35 ex. VAT | |
| Over £400 ex. VAT | FREE | |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | ||
| ORDER VALUE | DELIVERY CHARGE | |
| Under £100 | £25 ex. VAT | |
| Between £100 - £250 ex. VAT | £20 ex. VAT | |
| Over £250 ex. VAT | FREE | |
| SuperFOIL and YBS products | ||
| ORDER VALUE | DELIVERY CHARGE | |
| Each item | £10 ex. VAT | |
| Over £350 ex. VAT of 1 brand | FREE | |
| Paving Stone Products | ||
| DELIVERY CHARGE | ||
| FREE | ||
| Screws & Fixings and Adhesives & Sealants | ||
| ORDER VALUE | DELIVERY CHARGE | |
| Under £100 | £7.50 ex. VAT | |
| Over £100 ex. VAT | FREE | |
| Thermafleece CosyWool Roll & SupaSoft Insulation | ||
| QUANTITY | DELIVERY CHARGE | |
| 1 | £30 ex. VAT | |
| 2 | £60 ex. VAT | |
| 3 to 12 | £70 ex. VAT | |
| 13 to 24 | £140 ex. VAT | |
| 25 to 36 | £210 ex. VAT | |
| 37 to 48 | £280 ex. VAT | |
| 49 to 60 | £350 ex. VAT | |
| 61+ | £420 ex. VAT | |
| Thermafleece CosyWool Slab, Thermafleece UltraWool & Thermafleece NatraHemp | ||
| QUANTITY | DELIVERY CHARGE | |
| 1 | £30 ex. VAT | |
| 2 | £60 ex. VAT | |
| 3 to 4 | £70 ex. VAT | |
| 5 to 8 | £140 ex. VAT | |
| 9 to 12 | £210 ex. VAT | |
| 13 to 16 | £280 ex. VAT | |
| 17 to 20 | £350 ex. VAT | |
| 21+ | £420 ex. VAT | |
| Block Pavers | ||
| ORDER VALUE | DELIVERY CHARGE | |
| Under £100 | £17.50 ex. VAT | |
| Between £100 - £200 ex. VAT | £30.50 ex. VAT | |
| Between £200 - £900 ex. VAT | £105 ex. VAT | |
| Over £900 ex. VAT | FREE | |
| Artificial Grass | ||
| ORDER VALUE | DELIVERY CHARGE | |
| Under £100 | £12 ex. VAT | |
| Between £100 - £200 ex. VAT | £16.50 ex. VAT | |
| Over £200 ex. VAT | £22 ex. VAT | |
| Doors and Feature Panelling | ||
| QUANTITY | DELIVERY CHARGE | |
| 1 to 2 | £35 ex. VAT | |
| 3 to 4 | £45 ex. VAT | |
| 5+ | £60 ex. VAT | |
|
* Deliveries of Doors and Panels to Scotland may incur additional costs and may have an extended delivery time of an additional 3 working days. Delivery to the postcodes below will be charged an additional delivery fee. Our customer service team will reach out to you if you order requires an additional delivery charge. This will be calculated based on the difference between the standard cost charged and the total cost outlined below:
Postcodes: KA1-29, IV1-39, AB, PH1-41, DD, PA1-19, KY, FK, FK15-21 - £90 ex VAT (total delivery cost) |
||
| Ironmongery | ||
| DELIVERY CHARGE | ||
| 1+ | £16.50 ex. VAT | |
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
- Rigid partial fill cavity wall insulation
- Aluminium composite facing on both sides
- 0.022 W/mK thermal conductivity
- Easy to handle and install
- Zero Ozone Depletion Potential (ODP)
- BBA certified
Technical Specification
| Material Type: | PIR |
|---|---|
| Thickness: | 100mm |
| Width: | 450mm |
| Length: | 1200mm |
| Pieces Per Pack: | 6 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 3.24m2 |
| Brand: | Celotex |
| Manufacturer's Reference: | CW4100 |
| Weight: | 11.83kg |
| Thermal Conductivity: | 0.022W/mK |
Technical Downloads
What Is 100mm Cavity Wall Insulation Celotex CW4100?
Homes insulated with Celotex's 100mm Cavity Wall Insulation Board are not only warmer but also more cost-effective to maintain. This insulation solution significantly lowers energy bills by enhancing your home's thermal efficiency.
Specifically designed for partial fill cavity walls, it utilises a high-performance rigid polyisocyanurate (PIR) core, encapsulated between two layers of low emissivity foil facings, delivering an exceptional thermal conductivity of just 0.022 W/mK.
The boards' 100mm thickness and closed-cell structure offer excellent water-repellent properties, ensuring a weather-tight seal that prevents moisture from compromising insulation effectiveness.
These BBA-certified 100mm cavity wall insulation boards, leading the market in PIR cavity wall insulation, measure 1200mm x 450mm.
Their size, coupled with their rigid yet lightweight nature, makes them easy to handle and install, offering a snug fit between cavity wall ties for optimal thermal protection.
Where Is 100mm Cavity Wall Insulation Celotex CW4100 Used?
Celotex 100mm cavity wall insulation provides a completely reliable and cost-effective method of insulating new masonry cavity walls.
These partial fill cavity batts are sized at 1200mm x 450mm to suit standard wall tie spacings and provide a closed joint with adjacent boards.
For reference, a cavity describes two external walls that are separated by an air gap. These walls are often referred to as masonry leaves.
100mm Cavity Wall Insulation CW4100 Benefits
100mm Cavity Wall Insulation Celotex CW4100 is a good choice for homeowners who want to protect their homes from the elements and prevent air movement and heat loss in vulnerable exposure zones.
Let's check the specs:
- Flanked by low emissivity foil facings on either side for improved thermal insulation performance in cavity air spaces
- Future proofs the energy performance of new and existing buildings
- Comes in conveniently sized boards for installation between cavity wall ties using cavity tie clips
- British Board Approved (BBA) for use as partial fill insulation in masonry cavity walls
- Complies with building regulations to improve the thermal envelope of your home
- Zero ODP and Low Global Warming Potential (GWP)
- BBA certified
- BRE Green Guide Rating of A for sustainability
- Thermal resistance: 4.5m2K/W
Celotex 100mm Cavity Wall Insulation Certifications
Celotex 100mm Cavity Wall Insulation has a fire rating of E on the Euroclass Scale, which means that it has a high contribution to fire and is not classified as ‘non-combustible’ or of ‘limited combustibility'.
However, it may be used without height restriction in a wall on, or less than 1m from, a relevant boundary provided it is installed in a cavity that is between two leaves of masonry at least 75mm thick and has a cavity barrier around all openings in the wall and at the top of the wall head.
- Spread of flame: fire classification of Class E
- Thermal conductivity of 0.022 W/m.K, reducing the thickness of insulation required to hit the target U-value - BS EN 12667
- CE marking compliance to BS EN 13165:2001
- BRE Green Guide Rating of A for sustainability - which can assist in demonstrating environmental performance in your BREEAM assessments
- BBA certified
Customer Reviews
Good product for my job and arrived on time
Used in cavity air spaces. Have used before in new and existing buildings and had no complaints.
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