Full Fill Cavity
Full fill cavity insulation boards are designed for masonry cavity walls, helping you achieve strong thermal performance while fully insulating the available cavity space. We stock commonly specified sizes from trusted brands including Celotex, Recticel and Kingspan, available for quick collection or fast delivery to your site.
Discover Our Full Product Range:
| Brand | Product Code | Thickness | Sheet Size |
| Recticel | Eurowall Plus | 90mm | 1.2m x 0.45m |
| Recticel | Eurowall Plus | 115mm | 1.2m x 0.45m |
| Recticel | Eurowall Plus | 140mm | 1.2m x 0.45m |
| Celotex | Thermaclass 21 | 90mm | 1.19m x 0.45m |
| Celotex | Thermaclass 21 | 115mm | 1.19m x 0.45m |
| Celotex | Thermaclass 21 | 140mm | 1.19m x 0.45m |
| Kingspan | K106 | 90mm | 1.2m x 0.45m |
What is Full Fill Cavity Insulation?
Full fill cavity boards are rigid insulation panels designed specifically for masonry cavity wall construction. Manufactured from high-performance foam insulation, they are sized to fit securely between wall ties while providing strong thermal performance and resistance to moisture within the cavity.
Where it Full Fill Cavity Insulation best used?
- External masonry cavity walls
- New build housing projects
- Residential extensions
- Low-rise commercial construction
Why choose full fill cavity boards?
- Maximises insulation within the available cavity width
- Helps achieve current building regulation requirements
- Designed to resist moisture penetration in cavity walls
- Lightweight and easy to handle on site
- Consistent fit between wall ties for straightforward installation
Popular brands
- Celotex
- Recticel
- Kingspan
- Quinn Therm
- Xtratherm
FAQ’s:
Can you deliver cavity wall insulation to site?
Yes, we deliver across Watford and the surrounding areas. Orders placed early in the day can usually be dispatched on the same delivery run to help keep your project moving.
Do you keep full fill cavity insulation in stock?
We hold a selection of commonly specified thicknesses from leading brands, so whether you’re collecting or arranging delivery, we can get your order ready quickly.
What’s the advantage of full fill insulation compared to partial fill?
Full fill boards allow the entire cavity to be insulated, improving thermal performance without increasing wall thickness. They are specifically designed to manage moisture within cavity wall construction.
How do I choose the right thickness for my build?
The correct thickness depends on your cavity width and the U-value you need to achieve. If you’re unsure, our team can help you select the most suitable board for your specification.