Air-tightness - essentially meaning the elimination of draughts - is crucial to reducing energy demand in buildings. Likewise, no matter how good the build quality is, the design has to be right. Of course getting the design right is just the first step towards air-tightness - implementing it is the next. Niall Crosson emphasises the importance of simple design: In some cases, it simply means ensuring all of the normal construction components are fitted and sealed properly to prevent air leakage. You're adding on multiples of man hours by trying to seal them tightly. It's a widespread problem, and you get an average of about eight to twelve air changes per hour at 50 pascals in a dormer.
People buying a house want to get quality for their money.
AIRTIGHT DP - the best of
Studies have shown that gaps in the VCL can reduce insulation performance by up to 4. It gives the builder more control instead of having to rely on the final blower door test. Indeed, as recent case study articles in Construct Ireland have suggested, some closed panel timber frame homes are achieving superlative levels of air-tightness. A masonry house is relatively straightforward structurally. You may never need an intelligent membrane, but in the event of the unforeseen on site or over the life of the building it increases your drying levels.