ᐅ Exterior Insulation: Building a House with Poroton T7 Clay Blocks and Mineral Wool
Created on: 31 Mar 2014 11:30
S
Serage
Hello!
We are planning to build our house using Poroton T7 MW blocks. Our question concerns the wall thickness. The ground floor will have a brick veneer. Since the brick will also add a certain thickness, we want to build the ground floor walls thinner than the upper floor walls and accommodate the brick in that area. The question is:
Is it better to have 36cm (14 inches) on the ground floor and 42cm (17 inches) on the upper floor, or 42cm (17 inches) on the ground floor and 49cm (19 inches) on the upper floor? Are there any other options for insulation in this case?
Many thanks to the experts here!
We are planning to build our house using Poroton T7 MW blocks. Our question concerns the wall thickness. The ground floor will have a brick veneer. Since the brick will also add a certain thickness, we want to build the ground floor walls thinner than the upper floor walls and accommodate the brick in that area. The question is:
Is it better to have 36cm (14 inches) on the ground floor and 42cm (17 inches) on the upper floor, or 42cm (17 inches) on the ground floor and 49cm (19 inches) on the upper floor? Are there any other options for insulation in this case?
Many thanks to the experts here!
What exactly do you dislike about heat pumps today? From my layperson’s perspective, the technology can be considered mature after several decades. I don’t expect significant improvements to emerge in the near future. Other technologies may offer more promise in the future, but you want to build now, not sometime far ahead, right?
From what I have researched, you should expect to pay around 20k for a heat pump. Additionally, drilling issues can arise that may increase costs (e.g., concrete encasement). While a heat pump alone eliminates the need for gas, it will of course consume electricity. Since electricity prices tend to rise faster than gas prices, it only makes sense to pair it with a photovoltaic system (solar panels) and use the electricity generated by it. Going completely without a storage system is not really viable. With an 8 kWp system, including an electricity storage battery, the total cost is about 25k. Adding the heat pump brings the total to around 45k.
For 45k, I can get a gas heating system with gas supply for many, many years (at 6000 kWh/year/m², that comes to about 400 euros).
I am a strong supporter of heat pumps and photovoltaic systems, but if the compound interest effects are already higher than the investment in a gas heating system plus gas costs, how is this ever going to pay off? It might be better to wait and retrofit these systems later.
If there is something wrong with my calculation, I would appreciate any criticism ;-).
For 45k, I can get a gas heating system with gas supply for many, many years (at 6000 kWh/year/m², that comes to about 400 euros).
I am a strong supporter of heat pumps and photovoltaic systems, but if the compound interest effects are already higher than the investment in a gas heating system plus gas costs, how is this ever going to pay off? It might be better to wait and retrofit these systems later.
If there is something wrong with my calculation, I would appreciate any criticism ;-).
Do you believe there will be significant progress in this area, and that these advances will come at no additional cost or even reduce expenses? See. 🙂 That’s why I can understand your current decision to go with a gas/solar thermal system, and also that you might consider switching to a heat pump later, but I don’t get why you want to basically build a passive house step by step.
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Bauexperte1 Apr 2014 10:16Good day,
An air-to-water heat pump is roughly the same price as a gas condensing boiler with solar water heating. A geothermal heat pump involves additional costs between 9.5 and 13 thousand euros, depending on the drilling risks.
Name me a heating system that works without electricity? Properly sized heat pumps—meaning designed for the overall situation—consume very little electricity.
In my opinion, it sounds like you have not yet had a really good consultation? Otherwise, statements like the above probably wouldn’t come up.
Best regards, Bauexperte
Serage schrieb:
From what I have researched, you should expect around 20k for a heat pump.
An air-to-water heat pump is roughly the same price as a gas condensing boiler with solar water heating. A geothermal heat pump involves additional costs between 9.5 and 13 thousand euros, depending on the drilling risks.
Serage schrieb:
With just a heat pump, you avoid gas, but of course electricity will be needed.
Name me a heating system that works without electricity? Properly sized heat pumps—meaning designed for the overall situation—consume very little electricity.
Serage schrieb:
I am a big fan of heat pumps ...
In my opinion, it sounds like you have not yet had a really good consultation? Otherwise, statements like the above probably wouldn’t come up.
Best regards, Bauexperte
Bauexperte schrieb:
Good day, An air-to-water heat pump is roughly the same price as a condensing gas boiler with solar domestic hot water heating, ..... Hardly, unless there is a very unbalanced offer situation! ;-)Bauexperte schrieb:
...a ground source heat pump requires additional costs between 9.5 and 13 thousand euros, depending on drilling risks.... How do you arrive at this, when neither the actual annual extraction energy required for heating and domestic hot water nor the respective required cooling load is known? ;-)Best regards.
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