SKU: 58136002301

Thermaclass Cavity Wall 21 - 1190mm x 450mm

Sale price$101.00 Regular price$112.22
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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23

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Description

Thermaclass Cavity Wall 21 - 1190mm x 450mmThickness Sheets Per Pallet Sheet Coverage Pallet Coverage 90mm 96 0. 5355 m2 51. 4 m2 115mm 80 0. 5355 m2 42. 8 m2 140mm 64 0. 5355 m2 34. 2 m2 Thermaclass Cavity Wall 21 is an easy to install, high thermal performance polyisocyanurate (PIR) insulation board for full fill cavity wall applications, with a thermal conductivity of 0. 021 W m. K. It can be installed with up to a 10mm residual cavity (to support ease of installation and accommodate mortar

Thickness Sheets Per Pallet Sheet Coverage Pallet Coverage
90mm 96 0.5355 m2 51.4 m2
115mm 80 0.5355 m2 42.8 m2
140mm 64 0.5355 m2 34.2 m2

Thermaclass Cavity Wall 21 is an easy to install, high thermal performance polyisocyanurate (PIR) insulation board for full fill cavity wall applications, with a thermal conductivity of 0.021 W/m.K. It can be installed with up to a 10mm residual cavity (to support ease of installation and accommodate mortar squeeze) or as a full fill solution with no residual cavity.

The boards have a low emissivity foil facing to each side and feature an engineered tongue and groove joint profile, helping to ensure a continuous layer of insulation to maximise thermal performance and provide protection from wind driven rain.

Product Features

  • Lightweight 1190 x 450mm boards (installed dimensions)
  • Tongue and groove edge profile
  • Low emissivity foil facing
  • BBA approved – certificate 16/5343

Product Properties

  • Board size: 1190 x 450mm (installed) 1205 x 465mm (including tongue)
  • Thickness : 90-140mm
  • Material: PIR

Product Performance

  • Lambda: 0.021 W/m.K
  • Reaction to Fire: Euroclass E Reaction to Fire classification, according to EN 13501-1 (Products with this level of classification are not provided with a rating for smoke emission)

Product Benefits

  • Excellent thermal performance with a thermal conductivity of 0.021 W/m.K, reducing the thickness of insulation required to hit the target U-value.
  • Low emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value.
  • Easy to install – The boards are sized to fit standard cavity wall tie spacing. They are light and rigid, assisting with ease of transportation, handling and fitting.
  • BBA certified - Thermaclass Cavity Wall 21 has been assessed by the BBA as fit for use in defined full fill cavity wall applications if installed, used and maintained as set out in the certificate.

Applications

  • External Walls – full fill cavity wall

Key Considerations

Thermaclass Cavity Wall 21 should not be used in the external walls of buildings over 18 metres in height (England and Wales) or 11 metres in height (Scotland). Recent changes to Building Regulations mean that only non-combustible insulation or insulation of limited combustibility can be used in buildings of that height.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 58136002301

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4.7 ★★★★★
Based on 29 reviews
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Lianna E.
Boise, US
★★★★★ 5
Great product
Size: 4 Panels, Color: Beige
We needed something too block off a corner of a room. I looked through a ton of different room divider options on Amazon. I’m glad I did. I’ve had it up for about up about 4 months now, and it’s holding up well. Not too difficult to put together you just got to pay attention and make sure you’re putting it together the right way. The fabric is of good quality. It doesn’t feel flimsy.
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Reviewed in the United States on April 3, 2026
K
Verified Purchase
Kieran L.
Boise, US
★★★★★ 4
Decent room divider for a good price.
Size: 4 Panels, Color: Grey
Honestly I'm pretty happy with the product for the price paid. The instructions were relatively easy to figure out and I put it together myself in an afternoon. Looks good for how cheap it was, and does exactly what I wanted. Double check your measurements before buying, but this worked out great for me.
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Reviewed in the United States on April 2, 2026
S
Verified Purchase
SV
Lowell, US
★★★★★ 5
Great solution if you need some privacy!
Size: 6 Panels, Color: Beige
I had my family and relatives came over last holiday and I needed to provide a make shift rooms for them. I have a finished basement. I purchased 2 sets of VEVOR 6 Panel Room Divider and solved my problem. The VEVOR 6 Panel Room Divider is a practical and affordable way to create privacy in any space. It’s easy to set up and the folding design makes it simple to adjust or store when not in use. The panels are lightweight but still feel sturdy enough. Assembly needs some extra patience    Overall, a great value option for flexible and convenient room separation. Highly recommended. 
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Reviewed in the United States on April 25, 2026
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Verified Purchase
Theodora Bullard
Massapequa, US
★★★★★ 5
VEVOR Room Divider
Size: 6 Panels, Color: Black
The VEVOR Room Divider is good, it gives the privacy that I want and was easy to assemble.
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Reviewed in the United States on May 11, 2026
M
Verified Purchase
Mike
Louisville, US
★★★★★ 5
Super Value
Size: 4 Panels, Color: Grey, Size: 4 Panels, Color: Grey
While not elegant, these dividers are study, stable, and made of surprisingly high-quality materials for the price. The fabric has a heavy-duty feel and stretches nice and tight with no need to individually Velcro the top and bottom in place as compared to other options. That makes screwing-in one bolt per panel section a bit of a challenge that is best done with two people. However, the results are worth the effort. Otherwise, super quick and simple assembly. The included hex wrench works OK. However, using a 5/32nd inch (4 mm) hex bit in a manual or electric screwdriver dramatically speeds assembly and disassembly. Everything fits nice and neatly back into the divider's shipping box provided one carefully preserves its packing materials and notes how the box was originally packed. Our organization ordered 8 additional 4 panel sets after initial testing of one set of panels indicated that they were an extremely cost-effective alternative to renting "pipe and drape" to support displaying and dividing artwork. We plan to use rubber backed pushpins (also available via Amazon) to affix items to the dividers as needed.
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Reviewed in the United States on March 23, 2026

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