Hello everyone,
I’m sure someone is very familiar with the requirements of the 2014 Energy Saving Ordinance?!
Planned construction of a bungalow about 130 sqm (around 1400 sq ft) (near a lake, lots of wind).
The contractor’s offer states: "We build according to the 2024 Energy Saving Ordinance," but for the exterior wall with a plaster facade, they propose only a (30cm) (12 inch) Ytong PB PP 2 - 040 block with a U-value of 0.31 W/(m²·K) and a thermal conductivity (lambda) of 0.10 W/(m·K).
If I understand correctly, even Ytong does not recommend this block for a single-layer wall.
An energy performance certificate has already been issued.
Final energy demand 80.8 kWh/(m²·a), efficiency class C
Primary energy source natural gas H
About 5 sqm (54 sq ft) of solar panels for hot water
Underfloor heating
A civil engineer friend now tells us that according to the 2014 Energy Saving Ordinance this wall construction is not allowed. Is the energy certificate “too optimistic”?
The contractor is now suggesting—of course at an additional cost—a 24 cm (9.5 inch) wall with insulation, which we actually did not want. Since many things are running very uncertainly, we are correspondingly unsettled.
Where can we get a clear statement on this? Does anyone know the costs for verifying the calculation?
Thank you very much for any helpful information.
Myjako
I’m sure someone is very familiar with the requirements of the 2014 Energy Saving Ordinance?!
Planned construction of a bungalow about 130 sqm (around 1400 sq ft) (near a lake, lots of wind).
The contractor’s offer states: "We build according to the 2024 Energy Saving Ordinance," but for the exterior wall with a plaster facade, they propose only a (30cm) (12 inch) Ytong PB PP 2 - 040 block with a U-value of 0.31 W/(m²·K) and a thermal conductivity (lambda) of 0.10 W/(m·K).
If I understand correctly, even Ytong does not recommend this block for a single-layer wall.
An energy performance certificate has already been issued.
Final energy demand 80.8 kWh/(m²·a), efficiency class C
Primary energy source natural gas H
About 5 sqm (54 sq ft) of solar panels for hot water
Underfloor heating
A civil engineer friend now tells us that according to the 2014 Energy Saving Ordinance this wall construction is not allowed. Is the energy certificate “too optimistic”?
The contractor is now suggesting—of course at an additional cost—a 24 cm (9.5 inch) wall with insulation, which we actually did not want. Since many things are running very uncertainly, we are correspondingly unsettled.
Where can we get a clear statement on this? Does anyone know the costs for verifying the calculation?
Thank you very much for any helpful information.
Myjako
The challenging part is having the calculations done by an external office if you don’t have all the details about your house (all window areas, wall areas, roof insulation, etc.).
I was offered a re-calculation (a complete new calculation where the engineer has to enter the entire house into the system from scratch) for about 1500 € .
I was offered a re-calculation (a complete new calculation where the engineer has to enter the entire house into the system from scratch) for about 1500 € .
T
toxicmolotof1 Jul 2015 08:13Has the contract already been signed?
Just tell us what wall structure you are considering and what it will cost.
Why is there an energy performance certificate if the building does not exist yet? That cannot (and should not) happen, because the issuer confirms proper construction by issuing the certificate.
Apart from that, 80 kW/m² (8,300 BTU/ft²) seems too high for a modern new build in my opinion. Just my view.
Just tell us what wall structure you are considering and what it will cost.
Why is there an energy performance certificate if the building does not exist yet? That cannot (and should not) happen, because the issuer confirms proper construction by issuing the certificate.
Apart from that, 80 kW/m² (8,300 BTU/ft²) seems too high for a modern new build in my opinion. Just my view.
Thank you for your response,
@Wastl.
That is, of course, a huge price.
@toxicmolotow
It is an energy performance certificate.
The builder is still researching the cost of using a different type of brick but actually wants to stick with his Ytong blocks because everything complies with the energy saving regulations.
Unfortunately, this is not checked by the building authorities.
@Wastl.
That is, of course, a huge price.
@toxicmolotow
It is an energy performance certificate.
The builder is still researching the cost of using a different type of brick but actually wants to stick with his Ytong blocks because everything complies with the energy saving regulations.
Unfortunately, this is not checked by the building authorities.
T
toxicmolotof1 Jul 2015 09:13The energy performance certificate may only be issued once the building has been completed, as it verifies that the energy-related assumptions used in the calculations have been properly implemented. The certificate must not exist beforehand (even if in practice this is not always the case). If your builder constructs the building differently than assumed by the energy consultant, then they are in serious trouble and you end up with an incorrect (fraudulent) energy performance certificate!
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