1080p
2015-05-12 17:37:53
- #1
Good day,
I recently bought a house from the 1920s and now have to insulate a flat roof of about 45 sqm to a µ-value of <0.24 W/(m² K) according to the Energy Saving Ordinance 2014. Since the ceiling height is not very high, an inverted roof is suitable, i.e. insulation made of XPS (polystyrene) or PUR (polyurethane) directly on the existing bitumen membranes, which are then sealed again with bitumen membranes. I would like to do a lot myself, but need advice on the type and thickness of the insulation material.
The construction of the roof is simple, interior plaster - vapor barrier - wooden planks (about 5cm) - bitumen ... with a lot of luck there is still a layer of styrofoam under the plaster in the interior. The roof has a slope of about 5° and is intended to be used for a photovoltaic system.
My first question is, how exactly is compliance with the Energy Saving Ordinance checked? Does an energy inspector come after 2 years and measure the µ-value? Or is it sufficient if I provide plausible information about the installed insulation upon request, or...?
The second question is, how can I determine the insulation effort ... i.e. which material I have to install in which thickness? Does a (quite complicated) µ-value measurement have to be carried out in advance or is there a "calculation formula" for the different materials?
What would be the most cost-effective way to achieve legally compliant insulation?
Thank you and best regards, Benny
I recently bought a house from the 1920s and now have to insulate a flat roof of about 45 sqm to a µ-value of <0.24 W/(m² K) according to the Energy Saving Ordinance 2014. Since the ceiling height is not very high, an inverted roof is suitable, i.e. insulation made of XPS (polystyrene) or PUR (polyurethane) directly on the existing bitumen membranes, which are then sealed again with bitumen membranes. I would like to do a lot myself, but need advice on the type and thickness of the insulation material.
The construction of the roof is simple, interior plaster - vapor barrier - wooden planks (about 5cm) - bitumen ... with a lot of luck there is still a layer of styrofoam under the plaster in the interior. The roof has a slope of about 5° and is intended to be used for a photovoltaic system.
My first question is, how exactly is compliance with the Energy Saving Ordinance checked? Does an energy inspector come after 2 years and measure the µ-value? Or is it sufficient if I provide plausible information about the installed insulation upon request, or...?
The second question is, how can I determine the insulation effort ... i.e. which material I have to install in which thickness? Does a (quite complicated) µ-value measurement have to be carried out in advance or is there a "calculation formula" for the different materials?
What would be the most cost-effective way to achieve legally compliant insulation?
Thank you and best regards, Benny