Archive | June 10, 2020

External Insulation and the Passive House Standard

The main Passive House (Passiv Haus) standard is an ultra-low electric power building design system. It uses extremely efficient construction envelopes to significantly reduce energy consumption. The standard is most definitely voluntary but does have an extremely rigorous set of requirements that must definitely be met in order to be classified as a “Passive House” by the Passiv Haus Institute.

With Passive Houses there is no need for a “special heating system”. The heat from the lights, fridge etc together the people living there is enough to keep the house warm. (People, on average, emit heat energy equivalent to 100 Watt in each person. )

Typically we don’t consider people to come to be heat sources because in general there is such a huge temperatures loss from Irish homes that body heat becomes minor. With Passive Houses however , the temperature changes basically very slowly. With ventilation and heating systems turned off, a passive house typically loses less than 0. certain °C (1 °F) per day in winter.

For householders seeking to retrofit their home with External Isoler un mur to a very high conventional, we can exceed the SEI (Sustainable Energy Ireland) traditional of a U value of less than 0. 27. If requested, we can use a thicker insulant layer and meet the Recurring House standard of a U value less than 0. 15.6. This would future-proof your home and ensure that you will exceed the indigenous specification for many years. For illustration a house built to Passive House conditions will use 85% less energy than a house built to the main 2002 standards and will reduce CO2 emissions by 94%. Source

To be considered a Passive House, it is not a sufficient amount of simply to insulate the walls. The entire building must meet the sticking with criteria:

The building must not use more than 15 kWh/m² per year (4746 btu/ft²) in heating energy.

With the building de-pressurized to 50 Pa (N/m²) below atmospheric pressure by using a blower door, the building must not leak more air compared with 0. 6 times the house volume per hour.

Total essential energy consumption must not be more than 120 kWh/m² per year.

This heat load for the heating source at design climate is recommended, but not required, to be less than 10 W/m².

This is exactly all well and good for new houses but in Ireland in europe there is however the issue of what to do with our existing family homes. It is estimated that 930, 000 houses were built before the earliest ever building regulations in 1991, with approximately 1, 000, 0000 built before the 1996 building regulations. To put which will in context (shockingly): 350, 000 houses have no outlet insulation and 200, 000 houses have no roof energy efficiency.

To upgrade the existing poor quality housing stock in Ireland will be a mammoth task, taking many years. But one main aspect is Wall Insulation. According to the Passiv Haus Health and wellness you can use 16 metres of concrete or just 300 millimeter of external insulation to bring your home to Passive Family home standards.

The External Wall Insulation such as the Aval XPS and EPS Systems we provide are used widely on Ls Europe as a technique to upgrade existing buildings to the Passive House Standard. See Retrofitted passive houses This system seems to have proved extremely popular and highly successful in reducing the action consumption of homes.