WHAT’S NEW? BUFCA SAY CLOSED CELL
IS BEST The British Urethane Foam Contractors Association (BUFCA), the trade association representing installers of polyurethane foam, has predominantly represented the closed cell industry but recognises that the open cell alternative has different benefits.
A closed cell sprayed, or injected polyurethane foam material provides one of the highest insulation values commercially available. It also helps to achieve excellent structural stability for a building, adhering to the building substrate and setting quickly to form a rigid layer.
With greater thermal performance and reduced air leakage, polyurethane foam outperforms all other forms of cavity fill. Closed cell foams are resistant to driving rain, meaning that the material stays dry with no loss of thermal properties. The insulant can help act as a barrier to prevent flood waters from entering the building through the walls. The British Board of Agrément certification approves this insulant for cavity walls in all exposure zones.
Sprayed and injected closed cell polyurethane foams are also ideal for marine applications. They have high insulation properties with low insulation thicknesses with little impact on the useable space within the boat. Because the material is closed cell it will not absorb
water and bonds directly to the substrate with no voids or joints for condensation or cold bridging. Closed cell foams which achieve a Class 1 fire rating when tested to BS476 Part 7 are available. Or, where non-Class 1 materials are used on internal applications these must be covered by plasterboard, or a similar thermal barrier.
Conversely, open cell polyurethane foams which have entered the market in recent years do not have the high insulation properties. They do not have the same fire performance so they should never be
left exposed; they have no structural strength to stabilise roofs or walls and are widely marketed to be applied directly onto non-breathable membranes.
When choosing a BUFCA registered installer, customers can be assured of the highest standards of quality and service. Installers are required to abide by the Association’s Code of Professional Practice which aims to further good technical and professional conduct and promotes sound relationships between members and their customers.
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