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Having trouble passing air pressure tests?

Open and closed cell

Having trouble passing air pressure tests?

It has for some time been known that air leakage from buildings contributes to significant reductions in energy efficiency. Air leakage can occur through numerous gaps and imperfections in a buildings construction. In order to reduce this, new houses are subject to air pressure tests to measure the extent of leakage and, combined with other measures that make up a SAP rating, an overall energy efficiency level must be attained to meet with building regulations. Therefore achieving a good result when the dwelling is air pressure tested makes it considerably easier to reach the required SAP rating.

Poor air pressure results may be down to a number of factors such as ill-fitting doors and windows but a significant area where air leakage has been identified to occur is where insulation is poorly fitted with gaps, especially where board insulation is cut to fit between timbers. It is almost impossible to achieve a perfect fit when carrying out such an installation.

Attempts to tape the joins may have short term benefit but invariably over time the tape becomes prone to peeling off, unseen behind the plasterboard lining the structure. Other methods include introducing a layer of polythene behind the plasterboard. This, however fails to stop the cold air penetrating the void between the insulation panels and the polythene sheeting thus significantly negating the benefit provided by the insulation boards.

The Answer

Spray foam and injected polyurethane foam insulation can be applied to numerous elements of a buildings structure without the need for joins. In effect it offers a seamless layer of insulation with no gaps. Importantly, it avoids the problems associated with cutting board insulation between timbers, offering a complete air tight seal between the foam insulation and the timbers.

Duratherm is an spray foam insulation system which is onsite applied and is LABC and KIWA approved for use in both pitched and flat roofs whether they be in new or existing buildings. With new housing so often incorporating room in roof designs spray foam insulation offers massive advantages. In addition Duratherm may be used in timber frame walls ensuring that air leakage is kept to a minimum.

Technitherm is an injectable closed cell foam insulation system for cavity walls that is also LABC and KIWA approved. It offers continual insulation throughout the cavity without the joins that would otherwise be present using board insulation.


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