38 BUILDING FABRIC Manthorpe tile ventilators
the risk of condensation. For example, tighter building envelopes with enhanced insulation and airtightness are eff ective in reducing heat loss and energy consumption, but they can also trap moisture inside buildings. Also, the adoption of high-effi ciency heating, ventilation, and air conditioning (HVAC) systems, whilst contributing to energy savings, may alter the temperature and humidity dynamics within buildings, especially if the system is poorly balanced or incorrectly maintained. This all means that good quality ventilation, not just of the living space, but also of the structure, is ever more important to ensure eff ective moisture control. Manthorpe roof tile ventilators are a practical
T
and effi cient solution to addressing the ventilation needs in roof structures. The Manthorpe In-line ventilator range includes: • Non-profi led tile ventilators to suit most large format fl at interlocking tiles.
• Mid and large-format profi le ventilators to suit most common manufacturer’s tile shapes, including the popular 15 x 9 castellated tiles and single concrete pantiles.
• An interlocking plain tile ventilator for use with small format twin plain tiles. This ventilator features a unique sliding mechanism to adjust its width to suit all
he latest government initiatives aimed at reducing carbon emissions in buildings can have a direct and signifi cant impact on
three styles of interlocking plain tiles: Redland DuoPlain, Marley Ashmore and Forticrete Gemini.
• A plain tile ventilator to suit traditional double lapped plain tiles.
• A large format 600 x 300 mm slate ventilator, which can also be used for 500 x 250 mm slates by trimming the adjacent slates.
• A small format 500 x 250 mm slate ventilator, which can also be used for slates down to 400 x 200 mm by trimming the adjacent slates.
Manthorpe in-line ventilators are available in a wide range of colours, including textures to suit sand-faced tiles. They are easy to install and provide a quick and simple solution to roof space ventilation, mechanical extraction, and soil stack ventilation. There are many roof tile and slate ventilators on the market, but not all are what they claim to be. A common example are ventilators where the supplier claims a free ventilation area of 10,000 mm2
. Yet, they are supplied with an
integral 100mm pipe adaptor. Everyone who remembers their school day mathematics will know that the area of a 100mm diameter circle is ∏r2
7,855 mm2
, which is approximately 3.142 x 502 = , thus reducing the eff ective free
vent area of the ventilator. Installing ventilators which have a smaller free vent area than specifi ed runs the risk of under-venting the roof
space and consequently increases the risk of harmful condensation. The entire range of Manthorpe roof tile
and slate ventilators has been tested and certifi ed by the British Research Establishment (BRE) for resistance to rain penetration in accordance with CEN Standard FprEN 15601. The test conditions represent typical worse case conditions expected in Northern Europe during a 50-year return period. The testing showed the weathertightness performance of the ventilators to be better than that of the surrounding tiles. BRE has also measured the aerodynamic
characteristics of Manthorpe tile and slate ventilators under various air fl ow conditions. This means that Manthorpe can provide accurate data designers of mechanical extraction systems. In summary, excess moisture can wreak
havoc on a building’s structure and create an environment conducive to mould and mildew growth. Manthorpe roof tile ventilators, when part of an eff ective moisture control system, eff ectively manage moisture and prevent harmful condensation. But more than that, Manthorpe’s commitment to external testing, as well as their own extensive design and research programmes, means that specifi ers and installers can count on their products to do exactly what they are designed and built for.
01773 303000
www.manthorpebp.co.uk
WWW.HBDONLINE.CO.UK
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