ᐅ Heating system: air-source heat pump located in an unheated basement
Created on: 31 Jan 2023 12:26
H
HalloClarissa
HalloClarissa31 Jan 2023 12:26Now my structural engineer (also responsible for the energy performance certificate) and the basement builder do not agree.
The basement builder says: "Since the heating system is located in the basement, the basement must also comply with the building energy law" (the basement, built into a hillside, is planned with a 25 cm (10 inch) concrete wall and 10 cm (4 inch) XPS insulation on the exterior wall and under the slab, but it is unheated).
The structural engineer says: "It is sufficient for the energy performance certificate to show that the heating and hot water systems are not within the thermal envelope of the house but located in the unheated basement. What is important is the transition between the timber frame wall and the basement ceiling and basement wall, especially if there is structural insulation there, because the wall or base plate cannot rest on the exterior insulation of the basement wall. There is a construction detail from the homebuilder regarding this."
Background:
The bungalow, built with timber frame construction and a wooden facade (total thickness 25.5 cm (10 inches)), stands on a precast basement. The basement is built into a 22 % slope, so one side is completely underground, while the other side is fully above ground. The U-value of the basement walls will be approximately 0.35. We will insulate the basement ceiling as a DIY project. If we later convert a room into a guest room, we plan to add additional internal insulation.
WHO is correct?
I hope someone in this forum is familiar with the building energy law. Thank you very much.
The basement builder says: "Since the heating system is located in the basement, the basement must also comply with the building energy law" (the basement, built into a hillside, is planned with a 25 cm (10 inch) concrete wall and 10 cm (4 inch) XPS insulation on the exterior wall and under the slab, but it is unheated).
The structural engineer says: "It is sufficient for the energy performance certificate to show that the heating and hot water systems are not within the thermal envelope of the house but located in the unheated basement. What is important is the transition between the timber frame wall and the basement ceiling and basement wall, especially if there is structural insulation there, because the wall or base plate cannot rest on the exterior insulation of the basement wall. There is a construction detail from the homebuilder regarding this."
Background:
The bungalow, built with timber frame construction and a wooden facade (total thickness 25.5 cm (10 inches)), stands on a precast basement. The basement is built into a 22 % slope, so one side is completely underground, while the other side is fully above ground. The U-value of the basement walls will be approximately 0.35. We will insulate the basement ceiling as a DIY project. If we later convert a room into a guest room, we plan to add additional internal insulation.
WHO is correct?
I hope someone in this forum is familiar with the building energy law. Thank you very much.
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