Superglass Superwall 36

The Superwall 36 glass mineral wool for cavity walls is used to insulate the gap between masonry leaves. It is supplied in widths that match typical wall tie spacings, so that it fits with minimal trimming and for quicker installation.

What Is Superwall 36?

Superwall 36 is a flexible cavity batt with a thermal conductivity (λ) of 0.036 W·m⁻¹·K⁻¹. It is BBA-certified for cavity applications (full fill and partial fill). In full fill setups, the batt should lightly press against both leaves to seal air gaps as detailed in the BBA certificate.

Superglass Super wall 36 fibres are treated with water-repellent additives that prevent moisture from penetrating the inner masonry leaf. Being vapour-permeable, the batt allows the wall cavity to dry naturally and support long-term wall integrity.

The slab is Euroclass A1 (non-combustible) in accordance with BS EN 13501-1.

What Is Superglass 36 Cavity Insulation Used For?

Superwall 36 insulation is used to insulate cavities in masonry walls in new builds or suitable retrofits to reduce heat loss and meet Part L energy requirements.

It is approved for full fill cavity use in buildings up to 25m in height (check BBA conditions for exact limits). However, there are no height restrictions for partial-fill applications. Exposure zones and outer-leaf requirements must follow BBA conditions.

Benefits Of Superglass Cavity 36 Insulation

This is what makes Superglass 36 insulation reliable:

• Good thermal performance for mineral wool (λ = 0.036).
• Acoustic benefit – As mineral wool, it provides some sound reduction as part of cavity wall build-up.
• Helps meet fire safety requirements – Euroclass A1 means it is non-combustible and therefore reduces fire spread.
• High water repellence protects against moisture damage.
• Chemically inert and safe from mould.
• Holds its form and thickness once installed for sustained long-term performance.
• Superwall 36 helps achieve the U-value targets required under Part L 2021 for new dwellings. It meets NHBC requirements when installed in accordance with the BBA certificate.
• It is made with a high percentage of recycled glass, ensuring low embodied carbon.

FAQ

Where to buy Superglass 36 insulation?

You can buy Superglass Superwall 36 online from Insulation Wholesale. We stock Superglass cavity insulation 36 in a range of thicknesses that make it easy to select the appropriate thickness for your project. Our ordering procedure is straightforward for builders and homeowners. Request a quote for volume pricing with fast UK-wide delivery.

How to fix Superglass 36 insulation?

• Full fill batts: Install the batts directly into the cavity so they fit snugly between masonry leaves, ensuring proper engagement with wall ties.
• Partial fill: Use appropriate cavity wall ties with retaining clips to install the batts against the inner leaf. Maintain the specified residual cavity and do not compress the batt, as this can compromise performance.

Follow the BBA conditions and Approved Document L requirements for U-values and workmanship.

How to cut Superglass Cavity 36 insulation?

Cut batts on a clean board using a sharp insulation knife or fine-toothed saw. Score and snap for thin pieces, and use straightedge guides for a neat cut. Mineral wool fibres are irritants, so wear gloves, eye protection, and a dust mask.