November 2018

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Perfectly Pitched Err on the side of caution In roofs where the insulation is located parallel with the rafters and a vapour permeable underlay is installed in conjunction with an effective air and vapour control layer and continuous ceiling, roof space ventilation is not required. Otherwise, eaves to ridge ventilation should be installed, with clear airways in all rafter voids between the insulation and underlay. It is worth considering when designing a building that occupants may not always use the building in the way it was intended, so err on the side of caution and provide robust solutions. For example, a family with several young children may generate far more condensation than a single person, pushing ventilation systems beyond their limits; particularly in winter. Building Regulations and BS 5250 recognise that temporary condensation may occur during adverse climatic and internal conditions (e.g very “Controlling condensation within our buildings remains one of our key goals to ensure we live and work comfortably, healthily and to prevent damage to the building fabric” cold outside with little or no air movement, warm indoors with no windows open). It is common to see temporary overloads of condensation appearing on the underlay, which dissipates within a few days with no harm done – usually during very cold but still weather conditions. Any temporary condensation must not be severe enough to cause damp or staining on internal surfaces or cause damage to the structure generally. Summary • In new build homes we must strive to minimise air leakage through ceilings with efficient continuous ceilings and air and vapour control layers. • In older properties we must accept that air leakage happens and adequately ventilate the roofspace to prevent harmful condensation forming. • In extremes of cold / still air condensation ‘overload’ may occur, even where the roofspace ventilation complies with the guidance given in BS 5250; so supplement eaves ventilation with high level ventilation for greater efficiency. Contact EDILIANS (formerly Imerys) / John Mercer www.imerys-roof-tiles.com @imerys @johnmercer3 Illustration: Warm moist air can form condensation which, if left, can be harmful to occupants and the building fabric. 40 TC NOVEMBER <strong>2018</strong>
Take a ‘peep’ at our new products... We have extended our product range and are pleased to announce that we now manufacture and distribute Weep Vents and Peep Vents. • The Weep Vents have an integral grill design to prevent rain ingress during high winds and a lip to ease positioning during use. It is wide enough not to become blocked by day to day debris yet small enough to prevent access of large insects. • The Peep Vents provide cavity wall drainage solutions, allowing rain water to easily escape the cavity wall via a discreet aperture in the vent. • Available in a range of colours including: Black, Terracotta, Grey, Brown, Clear, Buff and White. Our full ventilation range consists of Over Fascia Vents, Continuous Rafter Trays, 2-in-1 and 3-in-1 Felt Support Trays, Eaves Comb, Circular Soffit Vents, Eaves Protection Strip, Tile Vents, Air Bricks, Telescopic Underfloor Vents, Cavity Sleeves and Extensions, plus much more... Contact us to request a copy of our new comprehensive 52 page Product Guide t 0845 034 6008 f 0845 034 6010 12B Metcalf Drive, Altham Industrial Estate, Altham, Lancashire, BB5 5TU, Great Britain www.easy-trim.co.uk
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November 2018

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