Kingspan Thermawall TW50 Partial-Fill Cavity Board

Thermawall TW50 is a foil-faced PIR board for partial-fill masonry cavity walls. It leaves a residual clear cavity between the insulation and outer leaf while adding a continuous thermal layer against the inner leaf.

The board is 1200 x 450mm, which aligns with common wall-tie spacing. Its declared thermal conductivity is 0.022 W/mK.

Install with the specified retaining clips and maintain the clear cavity shown on the wall design.

Why Choose This Product?

Choose this only when it matches the cavity strategy on the drawing. Full-fill and partial-fill boards are not interchangeable; the board facing, joint detail and required residual cavity are different.

Key Features

·        Partial-fill cavity PIR

·        1200 x 450mm

·        Declared conductivity: 0.022 W/mK

·        Foil faced

Common Uses

·        Partial-fill masonry cavity walls

·        Extensions and new-build walls

Installation

Cut boards or rolls accurately, close every joint and keep the insulation layer continuous at corners, openings and service penetrations. Use the fixings, tapes, membranes and covering layers stated for the selected construction.

Before You Install

·        Mixing up full-fill and partial-fill products.

·        Selecting a thickness without checking cavity width and the required residual cavity.

·        Leaving open joints or mortar droppings on board edges.

·        Using the wrong retaining clips or wall-tie detail.

Frequently Asked Questions

Is this full fill or partial fill?

Use the application stated in the title and technical description. Do not substitute one cavity strategy for the other.

Can I cut cavity boards?

Yes. Cut cleanly and keep the facing intact. Small pieces should remain firmly retained.

Do the joints need taping?

Follow the named cavity system. Most masonry cavity boards rely on tight joints and correct retaining details rather than ordinary foil tape.

How do I calculate quantity?

Divide the wall area by the coverage per board or pack, then allow for cutting waste and openings.

Can it be used in an existing wall?

Rigid cavity boards are normally installed as the wall is built. They are not injected into a completed cavity.

What You'll Need

·        Correct wall ties

·        Insulation retaining clips

·        Cavity closers

·        Cavity trays and stop ends

·        PIR cutting saw

Do You Need These Too?

These products are often useful for completing this type of installation:

·        Alpha Foil Tape — Seal foil-faced board joints and repair small tears for a neat, continuous finish.

·        Siniat GTEC dB Board — Add a denser lining where the completed wall or ceiling also needs improved acoustic performance.

·        Acoustic Sealant AC50 — Seal lining perimeters and small gaps to help reduce sound leakage through the finished construction.

You May Also Like

·        Kingspan Kooltherm K106 Full-Fill Cavity Board — another option for a similar application. Compare thickness, dimensions, thermal performance and system approval before ordering.

·        Recticel EuroWall Partial-Fill Cavity Board — another option for a similar application. Compare thickness, dimensions, thermal performance and system approval before ordering.

·        Recticel EuroWall+ Full-Fill Cavity Board — another option for a similar application. Compare thickness, dimensions, thermal performance and system approval before ordering.

Looking for an Upgrade?

Kingspan Kooltherm K106 Full-Fill Cavity Board — consider this higher-performance or more integrated route where it suits the construction and required specification.