Hello forum community,
We are seriously interested in a semi-detached house, but I have no knowledge about one aspect and also some skepticism.
It concerns a solid masonry semi-detached house. The developer has listed it as a KfW 55 house.
Heating is provided by a gas condensing boiler and solar panels (only for hot water, just under 5m² (54 ft²)).
The exterior walls are 24cm (9.5 inches) brick masonry. On top of the concrete basement slab, there is roughly 12cm (4.7 inches) of insulation, which looks like polystyrene. Additionally, the exterior render is noted as an external thermal insulation composite system, with insulation thickness of 14cm (5.5 inches) according to the thermal protection certificate.
There are many large windows (mainly on the south side) with triple-glazed insulating glass and a U-value of 0.9.
So far, only exhaust air ventilation is planned in the moisture-sensitive rooms, with no heat recovery system. Supply air probably comes through “intentional leakages”? The specifications are not yet clear on this, but further details are expected to be added.
What do you think of this concept, and is it possible for it to qualify as a KfW 55 house? I am particularly surprised by the “simplest” exhaust air system. When I asked, the developer did not necessarily recommend a central ventilation system with heat recovery. He said such a system doesn’t pay off. If at all, he can recommend decentralized ventilation units with heat recovery in certain rooms, naturally for an additional cost.
What are your thoughts?
We are seriously interested in a semi-detached house, but I have no knowledge about one aspect and also some skepticism.
It concerns a solid masonry semi-detached house. The developer has listed it as a KfW 55 house.
Heating is provided by a gas condensing boiler and solar panels (only for hot water, just under 5m² (54 ft²)).
The exterior walls are 24cm (9.5 inches) brick masonry. On top of the concrete basement slab, there is roughly 12cm (4.7 inches) of insulation, which looks like polystyrene. Additionally, the exterior render is noted as an external thermal insulation composite system, with insulation thickness of 14cm (5.5 inches) according to the thermal protection certificate.
There are many large windows (mainly on the south side) with triple-glazed insulating glass and a U-value of 0.9.
So far, only exhaust air ventilation is planned in the moisture-sensitive rooms, with no heat recovery system. Supply air probably comes through “intentional leakages”? The specifications are not yet clear on this, but further details are expected to be added.
What do you think of this concept, and is it possible for it to qualify as a KfW 55 house? I am particularly surprised by the “simplest” exhaust air system. When I asked, the developer did not necessarily recommend a central ventilation system with heat recovery. He said such a system doesn’t pay off. If at all, he can recommend decentralized ventilation units with heat recovery in certain rooms, naturally for an additional cost.
What are your thoughts?
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