ArneM
2017-08-19 20:39:35
- #1
Hello,
we are currently in the process of planning our new building and are now about to finalize the contract for work. However, in the offer presented to us and amended according to our wishes, the main contractor changed the type of insulation. He wanted to explain the change to us by phone, but due to the weekend I have not yet had the opportunity to discuss it with the main contractor.
I will also consult our KfW appraiser about this. Nevertheless, I think that multiple opinions cannot hurt and would like to ask you this question as well.
So far, the following was planned:
Solidly built single-family house to Kfw 40 standard
Exterior walls made of 150 mm aerated concrete
200 mm core insulation boards KD2 WLG 035
10 mm finger joint gap
115 mm facing bricks (clinker)
The perimeter insulation was to be made of 160 mm extruded rigid foam boards WLG 038 / WLZ (Id) 038.
Now, the perimeter insulation has been reduced to 80 mm and, in return, the exterior wall insulation has been changed from WLG 035 to WLG 032. Each without additional or reduced cost.
I have no idea what effects this has and whether the improvement in exterior wall insulation can actually compensate for the reduced perimeter insulation. From my (layman’s) point of view, good perimeter insulation is a great advantage with underfloor heating, as not all the heat is lost directly through the floor. Am I right?
As I said, I cannot say anything about the reasons for the change yet. I will ask about this on Monday.
By the way, the house is being built in Hamburg on sandy soil without clay or similar, if that matters.
I would be very grateful for your help!
we are currently in the process of planning our new building and are now about to finalize the contract for work. However, in the offer presented to us and amended according to our wishes, the main contractor changed the type of insulation. He wanted to explain the change to us by phone, but due to the weekend I have not yet had the opportunity to discuss it with the main contractor.
I will also consult our KfW appraiser about this. Nevertheless, I think that multiple opinions cannot hurt and would like to ask you this question as well.
So far, the following was planned:
Solidly built single-family house to Kfw 40 standard
Exterior walls made of 150 mm aerated concrete
200 mm core insulation boards KD2 WLG 035
10 mm finger joint gap
115 mm facing bricks (clinker)
The perimeter insulation was to be made of 160 mm extruded rigid foam boards WLG 038 / WLZ (Id) 038.
Now, the perimeter insulation has been reduced to 80 mm and, in return, the exterior wall insulation has been changed from WLG 035 to WLG 032. Each without additional or reduced cost.
I have no idea what effects this has and whether the improvement in exterior wall insulation can actually compensate for the reduced perimeter insulation. From my (layman’s) point of view, good perimeter insulation is a great advantage with underfloor heating, as not all the heat is lost directly through the floor. Am I right?
As I said, I cannot say anything about the reasons for the change yet. I will ask about this on Monday.
By the way, the house is being built in Hamburg on sandy soil without clay or similar, if that matters.
I would be very grateful for your help!