ᐅ New construction with Poroton T7 MW 36.5 blocks without a mechanical ventilation system
Created on: 12 Aug 2016 18:00
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Goldi09111
Hello everyone,
what do you think, is it necessary to include a mechanical ventilation system with heat recovery in a single-family house (140-160m2 (1506-1722 sq ft)) built with T7 bricks?
According to a construction company, they install this only about once every two years, and then only at the homeowner’s request.
I could imagine that with bricks, the wall can "breathe" to some extent and better regulate the relative humidity.
Thanks for your advice.
what do you think, is it necessary to include a mechanical ventilation system with heat recovery in a single-family house (140-160m2 (1506-1722 sq ft)) built with T7 bricks?
According to a construction company, they install this only about once every two years, and then only at the homeowner’s request.
I could imagine that with bricks, the wall can "breathe" to some extent and better regulate the relative humidity.
Thanks for your advice.
Stewi schrieb:
@Tom1607
What do you mean by a decentralized solution?A decentralized ventilation system. That means no ducts running through the house, but rather a ventilation unit in each room.
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Goldi0911114 Aug 2016 20:33If so, we will install a central system in the house.
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Goldi091114 Oct 2016 20:57Today I received a revised offer for a two-story house (urban villa) that includes an additional charge of about €3,600 for the T7 MW 36.5 compared to the T8. I find this a bit high, don’t you think? Is the extra cost worth it?
Yes, definitely. Based purely on the list price, the difference is about 250 euros per 1,000 bricks. So you could calculate how much that amounts to based on the ProHaus list price.
However, I heard from my general contractor that the T8 bricks are currently being sold relatively cheaply with significant discounts, so the additional cost might be accurate. He even mentioned that in some cases, 42.5cm (17 inches) bricks are being sold at almost no extra cost compared to identical 36.5cm (14 inches) bricks because the demand for the 42.5cm ones is very low.
However, I heard from my general contractor that the T8 bricks are currently being sold relatively cheaply with significant discounts, so the additional cost might be accurate. He even mentioned that in some cases, 42.5cm (17 inches) bricks are being sold at almost no extra cost compared to identical 36.5cm (14 inches) bricks because the demand for the 42.5cm ones is very low.
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Knallkörper4 Oct 2016 22:13Tom1607 schrieb:
Nowadays, only with controlled residential ventilation.
Houses are built so airtight today that there is no natural air exchange anymore. The idea of a “breathing house” is simply nonsense. There are building materials/blocks that regulate a certain amount of moisture. They absorb moisture when humidity is high and release it again when it drops. But humidity can only drop if the space is ventilated. If indoor air is not exchanged, the humidity inside will continuously increase because there is no air exchange. Eventually, mold will develop.
That's why you should always plan for controlled residential ventilation nowadays. If you want to reduce the investment, you can also consider a decentralized solution with heat recovery. It is cheaper but somewhat less efficient.
In my case, I have a central system and the ducts are installed in the ceiling.It is ultimately the builder's decision how the house is constructed. From the beginning, I was against controlled residential ventilation. In my view, it’s not necessary. I’d rather go for a double-wall, ventilated cold roof (and don’t need a vapor barrier on the upper floor), electric windows (with central control and rain sensor), and window seals can be made as leaky as you want. Then I don’t have to worry about a recirculation hood in the kitchen or similar stuff. People who install ventilation ducts in their house and then have to worry about energy losses from normal ventilation seem to me like poor souls.
Building dryers (dehumidifiers) help with the highest construction moisture. If necessary, you can even use them after moving in if you’re in a hurry and can’t leave the building open over winter. To me, the argument to install controlled residential ventilation because of construction moisture is the most ridiculous one.
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