Passive House Flat Roof

Alwitra flat roof details.

Passive house flat roof.

Passive house buildings have been described as the most comfortable due to them offering excellent thermal performance and exceptional airtightness. To achieve the passivhaus standard passive roofs need high levels of insulation thermal bridges need to be eliminated and the structure itself needs to be airtight. Passive house drives both innovation and design with a focus on energy efficiency and a carbon neutral offering. Passive house has a reputation for requiring ungodly amounts of insulation.

The main diagram below shows how the three passive elements roof wall and foundation link together. Blockfoam panels will be inserted between the rafters integrating insulation directly into the roof structure allowing for better air tightness. The individual roof type diagrams show the detail associated with each roof type. If you re familiar with any passive house projects you may be thinking about double stud walls that are a foot thick or regular walls with 6 to 12 inches of rigid insulation on the outside.

Journal of light construction march 25 2016. Fink truss attic truss the vaulted roof and the flat roof. Regardless of how new or modern a house is there is a good chance that it will be topped off with a flat roof now but if you can t picture how great they look we. It should come as no wonder then that these are experiencing a serious comeback right now.

The roof maker passive house flat rooflight. Ask any architect and they ll tell you that hardly any other type of architecture is as timeless and modern as that of flat roof houses. Speaking to passive house plus the company s hugh whiriskey emphasised that with more and more designers now specifying vapour control membranes in flat roof constructions it is crucial each roof structure is correctly designed to prevent any moisture issues from arising. The irish standard part l 2011 for a traditional roof structure is 0 16 w m2k.

All mbc passive roof systems deliver a u value of 0 10w m2k. This means the heating requirement is reduced to the point where a traditional heating system is no longer considered and therefore protects consumers from ever increasing fuel prices. Principle sketches of flat roofs for passive houses available as downloads in dwg dxf and pdf formats free of charge. How builders are tackling unvented flat roofs in passive houses.

This is very close to the passivhaus standard 0 10 0 15 w m2k however it still does satisfy it. Passive house is designed so that most of the air exchange with exterior is done by controlled ventilation through a heat exchanger in order to minimize heat loss or gain depending on climate so uncontrolled air leaks are best avoided.