Insulation and heating for new single-family house construction

  • Erstellt am 2015-02-04 10:13:19

EFHBaumax

2015-02-04 10:13:19
  • #1
Hello,

we want to start building a single-family house preferably still this year.

Therefore, we are currently requesting offers from many construction companies, but the various proposed versions differ considerably in some cases.
A plot of land of approximately 1100m² is already available.
The plan is for a single-family house of 150m² + basement. 1.5 floors, the basement partly exposed, gable roof and attached double garage.

Of course, everyone tries to sell their planned version as the best system. We are uncertain about the following points as to what really represents the optimal system.

Exterior walls:
-T8 Poroton with 425mm wall thickness, directly plastered.
-T8 Poroton with 300mm wall thickness and 160mm thermal insulation.

According to the UWertRechner, the variant with insulation is significantly better, but could the insulation lead to moisture problems, and is the investment in the insulation worthwhile?
By the way, only one provider wants to use glued bricks, the rest swear by lightweight mortar.

Roof:
The costs would be lowest with an inter-rafter insulation carried out by oneself, which could then be supplemented by an additional under-rafter insulation.

An external roof insulation is of course initially more expensive, but does it also bring a noticeable added value? One of the companies wants to convince us of external roof insulation and cites better insulation and improved heat protection as arguments.
What are your experiences and independent opinions?

Heating:
The ground floor and first floor are to be heated, as well as parts of the basement if needed, so a total of about 200m². The whole with underfloor heating.

A brine/water heat pump with an area collector was planned, additionally supported by a solar system for water heating, possibly also for regenerating the soil.
My wife, however, is a bit sensitive to the cold, so the room temperature at our place is often about 2°C higher than average. Does that also work economically with a heat pump?

Is it possibly even economical to install an additional air/water heat pump that takes over the supply at higher outside temperatures?

Unfortunately, there is no gas line on site; we have actually always been advised against oil, or is it still worthwhile, and are they just trying to sell us the expensive heat pumps?
 

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