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★★★★★ 4.5/5
Based on 128 Reviews
SKU : YBM847
Product Overview
Thermaclass Cavity Wall 21 is a rigid polyisocyanurate (PIR) insulation board designed for use in full-fill and partial-fill cavity wall applications. It features a low-emissivity aluminium composite foil facing on both sides, enhancing its thermal performance and making it ideal for energy-efficient masonry construction.
Key Features & Benefits
– High-performance PIR core for excellent thermal insulation.
– Low-emissivity foil facings improve U-value performance.
– Suitable for full-fill and partial-fill cavity wall applications.
– Tongue-and-groove edge profile for secure joints and reduced thermal bridging.
– Lightweight, easy to handle, and simple to install.
– Long-term durability and moisture resistance.
– Manufactured under ISO 9001 and ISO 14001 quality systems.
Technical Specifications
– Material: Rigid PIR foam core with aluminium composite foil facings
– Thicknesses available: 90 mm, 115 mm, 140 mm
– Board size (nominal): 1205 mm × 465 mm (net 1190 mm × 450 mm)
– Thermal conductivity (λD): 0.021 W/m·K
– Thermal resistance (RD):
– 90 mm = 4.25 m²·K/W
– 115 mm = 5.45 m²·K/W
– 140 mm = 6.65 m²·K/W
– Edge profile: Tongue and groove
– Compressive strength: ≥120 kPa at 10% deformation
– Reaction to fire: Class F (EN 13501-1)
– Standard compliance: EN 13165
– BBA Certificate: 16/5343
Applications / Typical Uses
Designed for use in new or existing masonry cavity wall constructions, providing continuous thermal insulation and improved energy efficiency. Suitable for use in domestic, commercial, and industrial buildings where cavity wall insulation is required.
Installation & Handling
– Install in accordance with local building regulations and manufacturer’s guidance.
– Ensure boards are closely butted with tongue-and-groove joints properly engaged.
– Protect installed boards from prolonged sunlight and moisture exposure.
– Store flat, off the ground, in a dry and shaded area.
Compliance & Certification
– Manufactured under independently monitored ISO 9001 and ISO 14001 management systems.
– Certified under BBA 16/5343 for use in UK cavity wall systems.
– Conforms to EN 13165 for thermal insulation products.
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Supplied directly from the Manufacturers.
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The average delivery lead time for the majority of orders is 3-5 working days from the date of your order, however, it could extend to 7-10 working days on rare occasions. Once the order has been placed, a member of staff will then be in contact to confirm a delivery date.
The following delivery fees apply to Grey delivery area.
Delivery lead times for orders outside our standard delivery may take between 7-10 working days. If you are outside our standard grey delivery area, please click on the “Save & Share Basket” button at the cart stage, select the email option and send it to sales@theyardbm.co.uk or call us on 07902 952 591. We will get back with a delivery quote to you shortly.
