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Hi, I'm Joe, I'm one of the client relationship managers at ATSPACE and today, I'm going to talk to you about what makes a passive house.

A passive house is a more robust build standard developed by the Germans in the 1990s by a gentleman named Doctor Wolfgang Feist, it's a build principle that promotes a more energy efficient and self-sustaining home.

So first and foremost, anyone can build a passive house, you or me can build one but to be certified, to have the plaque on the wall.

to be a certified passive house, it needs to be designed by either an architect or a designer using the PHPP which is the passive house planning package which is accreditation, nothing to do with building regs, it's a separate accreditation
done by the passive house trust that an architect or designer will go to, which means they can design fully fledged, certified passive houses.

Secondly, passive houses follow 5 principles:
the first is MVHR, which is a mechanical ventilation system with heat recovery. An MVHR system essentially extracts the stale hot air from the wet rooms, so, your kitchens and bathrooms it extracts it out of the property, at the same time fresh air is being drawn into the property, passing through an air-to-air heat exchanger which warms up the cold air fresh air being drawn in and put into the habitable rooms around 90-96% efficient, so the heat that you're creating by your wet rooms is being retained, then filtered into your habitable spaces meaning your heating system has to work less, and a passive house doesn't have conventional heating systems this is a great way to retain the heat and naturally heat the property up.

the second principle is high quality insulation
so, it goes without saying, having high quality insulation, lots of it, in all the walls, the roofs, ceilings, and the floor as well
making the fabric efficiency of the property very high
making the heat be retained and not lost through the walls.
This moves onto the third principle which is thermal bridge free
thermal bridging can count up to 30% of heat loss within properties through the, losing it through the junctions where it's not insulated so, all of the junctions are highly insulated
goes hand in hand with the high-quality insulation
to prevent any fabric heat loss, and any heat wasted, or energy wasted within the property.

the fourth principle is high quality glazing and typically, triple glazing which is usually argon filed and prevents any heat loss through the winter maximising solar gains through the winter
and minimising the solar gains through the summer you don't want your glass to be allowing all the heat in like today
or the sun coming in, warming the property up, over heating it
but then also allowing the heat to escape when it's cold
designed in a way to maximise solar gains in the winter
and minimize them through the summer. This is also done with combined shading as well and blinds and things like that.

the final principle is airtight construction passive houses need to achieve a maximum air change rate of 0.6 air changes an hour. Air leakage is vital in building energy efficient homes
so, minimising the air leakage of properties so, passive house has a standard across all buildings need to achieve a maximum of 0.6 air changes an hour

Thank you, guys, for watching, if you'd like to know any more information about passive houses then please check out the knowledge hub and don't forget to like and subscribe

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