ᐅ Ytong energy savings regulation allows 25 cm wall thickness – who has experience with this?
Created on: 3 Nov 2018 20:38
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Höhlenmensch
Höhlenmensch3 Nov 2018 20:38Yes, I have already searched and read everything, but I still have a question:
To what extent is the Energy Saving Ordinance mandatory?
I built my house myself 20 years ago using Ytong (ground floor with 25cm (10 inches) thick blocks and basement with 36cm (14 inches) thick blocks due to earth pressure).
Therefore, I know that working with 25cm (10 inches) blocks is easier, faster, cheaper, and simpler – and sufficient for the structural requirements!
Now I want to build a small home office extension and see the various discussions about thermal insulation in relation to the Energy Saving Ordinance.
The construction will be self-financed without any public funding. Can I use 25cm (10 inches) thick Ytong blocks?
I am not concerned about the energy savings – only whether this will be approved.
My question is not only based on the reasons mentioned above but also on the dimensions.
Due to the existing house and the construction stage, I have very little floor space left for the new build.
It may be difficult for some to understand, but if I use 36cm (14 inches) blocks instead of 25cm (10 inches), I lose 11cm (4 inches) on each side of the room, which is 22cm (9 inches) less interior space. Multiplied by the length, that adds up to several square meters, which explains the reason for my question given the limited available space.
So again... and thanks in advance:
Can I submit plans using 25cm (10 inches) thick Ytong blocks, and will this be approved?
Regards from someone who doesn’t want to draw plans twice for no reason. ;-)
To what extent is the Energy Saving Ordinance mandatory?
I built my house myself 20 years ago using Ytong (ground floor with 25cm (10 inches) thick blocks and basement with 36cm (14 inches) thick blocks due to earth pressure).
Therefore, I know that working with 25cm (10 inches) blocks is easier, faster, cheaper, and simpler – and sufficient for the structural requirements!
Now I want to build a small home office extension and see the various discussions about thermal insulation in relation to the Energy Saving Ordinance.
The construction will be self-financed without any public funding. Can I use 25cm (10 inches) thick Ytong blocks?
I am not concerned about the energy savings – only whether this will be approved.
My question is not only based on the reasons mentioned above but also on the dimensions.
Due to the existing house and the construction stage, I have very little floor space left for the new build.
It may be difficult for some to understand, but if I use 36cm (14 inches) blocks instead of 25cm (10 inches), I lose 11cm (4 inches) on each side of the room, which is 22cm (9 inches) less interior space. Multiplied by the length, that adds up to several square meters, which explains the reason for my question given the limited available space.
So again... and thanks in advance:
Can I submit plans using 25cm (10 inches) thick Ytong blocks, and will this be approved?
Regards from someone who doesn’t want to draw plans twice for no reason. ;-)
It is not the wall thickness that is regulated, but the U-value of the walls.
See the Energy Saving Ordinance 2014, Annex 3.
If I remember correctly, 0.035. How you achieve this is up to you.
But are you even affected? See Annex 3 again: for renovations under 50 m² (540 sq ft) and if the existing heating system is retained, you only need to comply with the insulation value of the existing building, which should then be the Energy Saving Ordinance from 1995, correct?
See the Energy Saving Ordinance 2014, Annex 3.
If I remember correctly, 0.035. How you achieve this is up to you.
But are you even affected? See Annex 3 again: for renovations under 50 m² (540 sq ft) and if the existing heating system is retained, you only need to comply with the insulation value of the existing building, which should then be the Energy Saving Ordinance from 1995, correct?
@Scout you have mixed up quite a few things.
The Energy Saving Ordinance applies to all new buildings and extensions intended for permanent residential use, regardless of size.
Annex 3.7 Table 1 always applies – requirements for individual building components. This specifies a U-value of less than 0.24 W/m²K (0.042 Btu/h·ft²·°F) for exterior walls. All other requirements for individual components (roof surfaces, windows, floors, etc.) can also be found there.
For extensions over 50m² (540 ft²), or when a new heating system (NOT radiators) is installed, additional requirements apply, and an energy demand calculation must be carried out. The Renewable Energies Heat Act then applies, which mandates the integration of renewable energy into the heating system. Overall, your house must comply with the 2014 Energy Saving Ordinance without tightened requirements, allowing a maximum 40% increase in energy demand.
So, NO, you are not allowed to use 24cm (9.5 inches) masonry units, and it’s best to keep extensions under 50m² (540 ft²) and only install new radiators; otherwise, it becomes more expensive and complicated.
@Scout 0.035 W/mK (0.20 Btu·in/hr·ft²·°F) is the maximum lambda value for the thermal conductivity of insulation materials permitted according to Annex 3, if the specified U-values cannot be met due to given conditions.
The Energy Saving Ordinance applies to all new buildings and extensions intended for permanent residential use, regardless of size.
Annex 3.7 Table 1 always applies – requirements for individual building components. This specifies a U-value of less than 0.24 W/m²K (0.042 Btu/h·ft²·°F) for exterior walls. All other requirements for individual components (roof surfaces, windows, floors, etc.) can also be found there.
For extensions over 50m² (540 ft²), or when a new heating system (NOT radiators) is installed, additional requirements apply, and an energy demand calculation must be carried out. The Renewable Energies Heat Act then applies, which mandates the integration of renewable energy into the heating system. Overall, your house must comply with the 2014 Energy Saving Ordinance without tightened requirements, allowing a maximum 40% increase in energy demand.
So, NO, you are not allowed to use 24cm (9.5 inches) masonry units, and it’s best to keep extensions under 50m² (540 ft²) and only install new radiators; otherwise, it becomes more expensive and complicated.
@Scout 0.035 W/mK (0.20 Btu·in/hr·ft²·°F) is the maximum lambda value for the thermal conductivity of insulation materials permitted according to Annex 3, if the specified U-values cannot be met due to given conditions.
H
hemali20034 Nov 2018 01:17We built in 2017 with a well-known general contractor using 24cm (10 inches) aerated concrete blocks plus plaster, but without any additional insulation layer.
hemali2003 schrieb:
In 2017, we built with a well-known general contractor using 24cm (9.5 inches) aerated concrete blocks plus plaster, but without any additional insulation layer..How much do you pay monthly for heating and hot water?
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