70mm Kingspan TW50 Thermawall - 1200 x 450mm - Pack of 6

1200 x 450 x 70mm Kingspan TW50 Thermawall Cavity Insulation (Per 6 Boards - 3.24m2)

Partial fill insulation designed for use in cavities where a clear air gap is required.

Benefits of using PIR insulation

• High performance 70mm rigid thermoset insulation -
  thermal conductivity 0.022 W/m.K
• Clear cavity is maintained – resists moisture penetration
• Low emissivity foil facings are resistant to the passage of water vapour and double the thermal resistance of the cavity
• Meets NHBC technical requirements when used with a 50 mm residual cavity

Multi-purpose insulation boards

Although primarily used for insulating masonry cavities; Kingspan TW50 70mm can also be used in other applications where a smaller sized board is required. This high perfomance rigid urethane insulation can be used in between battens to line out external walls. It also comes in handy when insulating loft spaces where access is difficult. This is providing current building regulations are adhered to.

Is PIR insulation easy to cut?

Easy to cut to the required size with a normal handsaw to friction fit in between even the most awkward of spaces. When cutting and installing 70mm Kingspan TW50 insulation board, ensure that any gaps are filled with an expanding urethane sealant so there are no cold spots. On thinner boards up to around 50mm, less mess is made if a sharp-bladed knife is used. As it can be quite a messy job, it is advisable to wear safety clothing, especially as dust mask at the very least!

The technical stuff!

Polyisocyanurate, or 'PIR' as it is more commonly known is one of the most thermally efficient insulants in the construction market at present. By combining polyols and isocyanurates a thermoset polymeric material is formed that is both rigid and robust and will not heat when melted. This therefore provides much higher thermal insulation values when compared to thermoplastic products such as polystyrene which would melt when heated.

Unlike many other organic products where performance is largely a function of geology, geography, processing and orientation, PIR can be precisely engineered from first principles to achieve specific and repeatable performance characteristics.

During the manufacturing process, the chemical reaction of combining liquid polyol and isocynates produces a wet, tacky foam which then hardens and sets in any desired form. When producing sheets of insulation, this leads to finer tolerances and consistent thicknesses.

Is PIR Insulation waterproof?

To a certain extent yes. The material is a 'closed cell' product which means that water absorption should be minimal. That said, it is not advisable to leave the sheets outside exposed to the elements for any long period of time. This will cause the edges to deteriorate and discolour. If it does get wet, it should be allowed to dry indoors naturally before installing.

PDF technical data sheet