Hello,
we received a quote for a single-family house built according to the Energy Saving Ordinance from a builder, who offers the following exterior wall construction:
- 17.5 cm (7 inches) aerated concrete
- Mineral fiber insulation mat with a minimum thickness of 14 cm (5.5 inches) according to the thermal protection certificate (thermal conductivity 0.035 W/mK)
- 11.5 cm (4.5 inches) facing brick
What is the evaluation of these materials regarding thermal insulation and soundproofing?
Are there quality differences in this construction as well?
For an additional cost of €2,000, the following upgrades are available:
- 140 mm (5.5 inches) cavity insulation with a thermal conductivity of 0.035 W/mK in the facing brickwork
- 180 mm (7 inches) mineral wool insulation with a thermal conductivity of 0.035 W/mK in the rafter area
- 240 mm (9.5 inches) mineral wool insulation with a thermal conductivity of 0.035 W/mK in the collar beam area
- 100 mm (4 inches) polystyrene rigid foam insulation with a thermal conductivity of 0.035 W/mK under the ground floor screed
With a solar system for domestic hot water preparation, which costs almost €7,000, KfW 70 standard could be achieved.
What do you think about this?
Is the standard specification sufficient, and is the upgrade worth the additional cost?
we received a quote for a single-family house built according to the Energy Saving Ordinance from a builder, who offers the following exterior wall construction:
- 17.5 cm (7 inches) aerated concrete
- Mineral fiber insulation mat with a minimum thickness of 14 cm (5.5 inches) according to the thermal protection certificate (thermal conductivity 0.035 W/mK)
- 11.5 cm (4.5 inches) facing brick
What is the evaluation of these materials regarding thermal insulation and soundproofing?
Are there quality differences in this construction as well?
For an additional cost of €2,000, the following upgrades are available:
- 140 mm (5.5 inches) cavity insulation with a thermal conductivity of 0.035 W/mK in the facing brickwork
- 180 mm (7 inches) mineral wool insulation with a thermal conductivity of 0.035 W/mK in the rafter area
- 240 mm (9.5 inches) mineral wool insulation with a thermal conductivity of 0.035 W/mK in the collar beam area
- 100 mm (4 inches) polystyrene rigid foam insulation with a thermal conductivity of 0.035 W/mK under the ground floor screed
With a solar system for domestic hot water preparation, which costs almost €7,000, KfW 70 standard could be achieved.
What do you think about this?
Is the standard specification sufficient, and is the upgrade worth the additional cost?
Mycraft schrieb:
A solar system never pays off... it’s more for peace of mind...Can you support this statement with example calculations?
Häusle77 schrieb:
Can you back up this statement with sample calculations?Can you provide sample calculations to prove that it pays off?
For $7,000, you get the commonly known basic solar system—about 5 square meters (54 square feet) of solar thermal on the roof. Calculations show that with this size, you save around €5,000 to €6,000 over a period of 25 years. However, whether the system will still be fully functional by then is uncertain.
I’m not trying to talk you out of it—we have the same 5 square meters (54 square feet) on our roof—but I just mean that it’s more for peace of mind. And I do think it’s pretty cool to be at least independent from the utility during the summer.
But for me, the whole thing probably wouldn’t be worth $7,000. You also have to factor in about 30% higher maintenance costs annually.
I’m not trying to talk you out of it—we have the same 5 square meters (54 square feet) on our roof—but I just mean that it’s more for peace of mind. And I do think it’s pretty cool to be at least independent from the utility during the summer.
But for me, the whole thing probably wouldn’t be worth $7,000. You also have to factor in about 30% higher maintenance costs annually.
Mycraft is right!
Here is my suggestion. Have the piping for the solar system installed during construction.
If you have some extra money later, you can always add the collectors and the storage tank.
In this case, a solar system with heating support!
Alternatively, a fireplace with a water jacket and a heat storage tank of 800-1000 liters (210-265 gallons) can also support the heating system!
Best regards, Leo
Here is my suggestion. Have the piping for the solar system installed during construction.
If you have some extra money later, you can always add the collectors and the storage tank.
In this case, a solar system with heating support!
Alternatively, a fireplace with a water jacket and a heat storage tank of 800-1000 liters (210-265 gallons) can also support the heating system!
Best regards, Leo
A chimney with water jackets is a really bad idea... it won’t pay off even in 100 years.
And if you add heating support, you would need at least 30-35 square meters (about 7,000 + 2,000 each for 5 additional square meters + larger storage tank, etc., so around 25,000) of solar thermal panels... to actually benefit in winter. But where do you put all that energy in summer? And will the 25,000 ever pay off???
And if you add heating support, you would need at least 30-35 square meters (about 7,000 + 2,000 each for 5 additional square meters + larger storage tank, etc., so around 25,000) of solar thermal panels... to actually benefit in winter. But where do you put all that energy in summer? And will the 25,000 ever pay off???
Tubifex schrieb:
Mycraft is right!
Here is my suggestion. Have the piping for the solar system installed during construction.
If you ever have extra funds, you can still install the collectors and the storage tank later.
In this case, a solar system with heating support!
Alternatively, a fireplace with a water jacket and a thermal storage tank of 800–1000 liters (210–265 gallons) can also be used to support the heating system!
Best regards, Leo I think that’s how we will do it. What about the remaining insulation measures? Is this a good basis? By the way, brick cladding is mandatory according to the development plan!
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