Hello everyone,
We are currently planning our single-family home in the Stuttgart area. Apart from the exterior wall, most details are already decided. The house will be built in a quiet residential area with underfloor heating and gas.
I have received three options:
1. 17.5 cm (7 inches) brick + external thermal insulation composite system (ETICS) (standard wall) with no extra cost.
2. Ytong 36.5 cm (14 inches) block – if I may call it that – with a thermal transmittance of 0.23 W/m²K – additional cost: €8,900.
3. Poroton with 0.19 W/m²K – additional cost: €12,200.
I don’t really want to insulate my house with expanded polystyrene (EPS). I’m not a fan of that. Now I’m hesitating between options 2 and 3. What would you recommend?
Thank you very much.
We are currently planning our single-family home in the Stuttgart area. Apart from the exterior wall, most details are already decided. The house will be built in a quiet residential area with underfloor heating and gas.
I have received three options:
1. 17.5 cm (7 inches) brick + external thermal insulation composite system (ETICS) (standard wall) with no extra cost.
2. Ytong 36.5 cm (14 inches) block – if I may call it that – with a thermal transmittance of 0.23 W/m²K – additional cost: €8,900.
3. Poroton with 0.19 W/m²K – additional cost: €12,200.
I don’t really want to insulate my house with expanded polystyrene (EPS). I’m not a fan of that. Now I’m hesitating between options 2 and 3. What would you recommend?
Thank you very much.
Whether or not you "need" a ventilation system depends on several factors. In the end, you have to comply with the energy saving regulations – if you want to keep insulation minimal, you will need supporting technology like ventilation. With any wall construction, if the thickness is sufficient, you can avoid mechanical ventilation with heat recovery – if you really want to.
T
thomas_neo29 Dec 2014 11:36Hello everyone,
Seismic zone would be: 0
I am building with a developer who has offered me three wall constructions so far. Normally, they always use the first option.
My prospective site manager said that with the T8 block, I might be able to avoid installing controlled mechanical ventilation.
Seismic zone would be: 0
I am building with a developer who has offered me three wall constructions so far. Normally, they always use the first option.
My prospective site manager said that with the T8 block, I might be able to avoid installing controlled mechanical ventilation.
D
Doc.Schnaggls29 Dec 2014 11:39thomas_neo schrieb:
My potential site manager said that with the T8 block, I might be able to avoid the mechanical ventilation system.Hello,
Do you have a specific reason for not wanting a mechanical ventilation system?
Regards,
Dirk
T
thomas_neo29 Dec 2014 11:42Hello Dirk,
Not really. In this case, I just wanted to save the costs (about 5,000€). We also like to keep the windows open at the moment. In the bedroom, almost all year round.
I’m not sure either. Maybe the standard wall construction with external thermal insulation composite system (ETICS) and mechanical ventilation with heat recovery would be the best option.
Not really. In this case, I just wanted to save the costs (about 5,000€). We also like to keep the windows open at the moment. In the bedroom, almost all year round.
I’m not sure either. Maybe the standard wall construction with external thermal insulation composite system (ETICS) and mechanical ventilation with heat recovery would be the best option.
B
Bauexperte29 Dec 2014 12:07Hello,
So you are getting land and house from a single source. Remember to consider the property transfer tax (also known as stamp duty or conveyance tax)!
So, you are primarily discussing the financial aspects of the upcoming construction project. If you want to meet the KfW 70 standard, you can—almost always—do without a controlled ventilation system with heat recovery; but only if you are concerned about KfW funding. In my opinion, that would be too short-sighted...
A ventilation system always makes sense; heat recovery is only useful in rooms where heat can actually be recovered. It also makes sense if you cannot guarantee continuous ventilation of the new building during the first two years; even more so if you plan to build with external thermal insulation composite systems (ETICS or external wall insulation).
Nowadays, there are many systems available, ranging from affordable decentralized units (around 6,000 EUR) to central units (around 10,000 EUR). For example, we currently use a system that I consider a middle ground between these two options; not fully central but certainly not decentralized (around 7,000 EUR). Take some time to look around the forum in the relevant threads and then decide calmly. All advantages and disadvantages have been discussed extensively.
Regards, Bauexperte
thomas_neo schrieb:
I am building with a developer who has offered me three wall construction options so far. Normally, he chooses the first combination.
So you are getting land and house from a single source. Remember to consider the property transfer tax (also known as stamp duty or conveyance tax)!
thomas_neo schrieb:
My potential site manager said that with the T8 brick, I might be able to avoid installing a controlled residential ventilation system.
So, you are primarily discussing the financial aspects of the upcoming construction project. If you want to meet the KfW 70 standard, you can—almost always—do without a controlled ventilation system with heat recovery; but only if you are concerned about KfW funding. In my opinion, that would be too short-sighted...
A ventilation system always makes sense; heat recovery is only useful in rooms where heat can actually be recovered. It also makes sense if you cannot guarantee continuous ventilation of the new building during the first two years; even more so if you plan to build with external thermal insulation composite systems (ETICS or external wall insulation).
Nowadays, there are many systems available, ranging from affordable decentralized units (around 6,000 EUR) to central units (around 10,000 EUR). For example, we currently use a system that I consider a middle ground between these two options; not fully central but certainly not decentralized (around 7,000 EUR). Take some time to look around the forum in the relevant threads and then decide calmly. All advantages and disadvantages have been discussed extensively.
Regards, Bauexperte
I am generally a fan of Poroton, but if you are using ETICS (external thermal insulation composite systems), I might rather choose calcium silicate bricks due to their higher mass, which provides better protection against summer heat.
By the way, after living in the house for two months, I wouldn’t want to miss controlled mechanical ventilation anymore. Think it over carefully.
By the way, after living in the house for two months, I wouldn’t want to miss controlled mechanical ventilation anymore. Think it over carefully.
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