Good morning,
We are planning to build a house for five people. Until now, we didn’t have to deal with this at all and have been living comfortably in our detached house that is already 40 years old.
Now, due to work reasons, we need to move again.
However, we have some time since we are currently still commuting (almost 3 hours every day).
The financing is basically secured, as we can sell our current house. The rest is mostly covered by the car costs we save.
We already have three offers: two for solid construction and one from a prefabricated house manufacturer.
The most cost-effective option so far is the following:
Increased thermal insulation of the base slab, highly insulating brick masonry, increased insulation of the facade, as well as insulation in the upper floor roof area as needed.
Efficient heat pump (Tecalor THZ 304/404 SOL including a three-year manufacturer warranty) with a 235-liter (62-gallon) hot water tank and preparation for cooling and connection of a solar system. Controlled ventilation with cross heat exchanger for up to 90% heat recovery, including pollen and fine dust filters. WEB module (Internet Service Gateway) with remote diagnostics and maintenance. Underfloor heating on the ground floor (except utility room) and upper floor, including room thermostats integrated into the switch program. Climate protection windows, triple-glazed (Ug 0.7-0.9), with mushroom-head locks and security fittings.
Built as a KfW 55 (energy-efficient) house. However, as I have read in construction blogs, this is done only with 17.5 cm (7-inch) Poroton bricks and exterior insulation with polystyrene.
Now comes my question: How should we approach this? Does it make sense to build it this way? The many posts confuse us completely.
Maybe you could at least point us in the right direction at first.
Best regards, Xinette
We are planning to build a house for five people. Until now, we didn’t have to deal with this at all and have been living comfortably in our detached house that is already 40 years old.
Now, due to work reasons, we need to move again.
However, we have some time since we are currently still commuting (almost 3 hours every day).
The financing is basically secured, as we can sell our current house. The rest is mostly covered by the car costs we save.
We already have three offers: two for solid construction and one from a prefabricated house manufacturer.
The most cost-effective option so far is the following:
Increased thermal insulation of the base slab, highly insulating brick masonry, increased insulation of the facade, as well as insulation in the upper floor roof area as needed.
Efficient heat pump (Tecalor THZ 304/404 SOL including a three-year manufacturer warranty) with a 235-liter (62-gallon) hot water tank and preparation for cooling and connection of a solar system. Controlled ventilation with cross heat exchanger for up to 90% heat recovery, including pollen and fine dust filters. WEB module (Internet Service Gateway) with remote diagnostics and maintenance. Underfloor heating on the ground floor (except utility room) and upper floor, including room thermostats integrated into the switch program. Climate protection windows, triple-glazed (Ug 0.7-0.9), with mushroom-head locks and security fittings.
Built as a KfW 55 (energy-efficient) house. However, as I have read in construction blogs, this is done only with 17.5 cm (7-inch) Poroton bricks and exterior insulation with polystyrene.
Now comes my question: How should we approach this? Does it make sense to build it this way? The many posts confuse us completely.
Maybe you could at least point us in the right direction at first.
Best regards, Xinette
So, first of all, I hope I understood everything correctly.
Poroton blocks are good, but 17.5 cm (7 inches) thickness is not enough. The 15 cm (6 inches) external Styrofoam insulation is not ideal either, even if it achieves the required thermal value.
Would a 36.5 cm (14.5 inches) Poroton T9 filled with perlite be sufficient? What additional costs should I expect?
If geothermal energy is not possible or too expensive, then a sensible gas heating system.
For ventilation, preferably no central system, but only ventilation installed as needed in the wet rooms?
Triple-glazed windows should probably also be used.
Would this already allow me to achieve a KfW 55 standard house?
Best regards, Xinette
Poroton blocks are good, but 17.5 cm (7 inches) thickness is not enough. The 15 cm (6 inches) external Styrofoam insulation is not ideal either, even if it achieves the required thermal value.
Would a 36.5 cm (14.5 inches) Poroton T9 filled with perlite be sufficient? What additional costs should I expect?
If geothermal energy is not possible or too expensive, then a sensible gas heating system.
For ventilation, preferably no central system, but only ventilation installed as needed in the wet rooms?
Triple-glazed windows should probably also be used.
Would this already allow me to achieve a KfW 55 standard house?
Best regards, Xinette
B
Bauexperte20 Oct 2014 11:42Hello,
Regards, Bauexperte
BeHaElJa schrieb:In a new build ...?
What does that mean? Assuming your house has a final heating energy demand of about 20,000 kWh, you would consume 7,100 kWh of electricity here
BeHaElJa schrieb:The current maximum would be a groundwater or water-to-water heat pump.
If you care about the ideal solution, ground-source heat pumps would probably be recommended – they are significantly more expensive but have COPs of around 5.
Regards, Bauexperte
Similar topics