Our experts sat on the phone for you for a full eight hours, to answer your questions. Here is a small selection.
I. I cringed, Like: We want to re-cover our roof and insulate it at the same time. I would like to know, whether insulation on the rafters or between the rafters is better.
With both methods, the only thing that matters is the thickness and the thermal transmittance of the insulation material. With the same values, you will achieve equally good insulation. However, the workload for insulation between the rafters is a little more.
G. Winter, Hamelin: We would like to expand the upper floor of our two-family house, in which so far there are only storage rooms. Is that even a loft conversion, because there is another loft above this storey, on which the laundry used to be hung? Do we have to submit a building application for this, the approval of which would be guaranteed to involve a number of conditions?
What are you doing there, is a classic loft conversion, and for that you need a building permit. Fears, that unreasonable conditions are imposed on you, you don't need to have it. If you do not intervene in the statics and do not change anything on the facade, there are usually no requirements from the building authority.
M. Keller, soest: I decided, to make above-rafter insulation on my roof. How about installing a roof window?? Can I do that later?, or is it better, I'll build it in right now?
It makes sense, to tackle the installation of the roof window at the same time, because it saves you double work. If you don't have the means right now, but you can also use such a window
install later. However, you then have to remove the insulation and the roofing in the installation area.
W. Müller, Cham: Our roof has an angle of 30 City, we would like to use a dormer there in the course of the roof extension. We were told earlier at our building department, Dormers should only take off 38 Degree of roof pitch. Will the new building law finally create uniform regulations, because in other federal states there are no problems with it?
Unfortunately, there are still considerable regional differences in building law. And you still have to comply with the requirements of your building authority. But since then the state has supported the creation of additional living space, there have been a number of reliefs compared to previous years. If you now contact your building authority again, you should have better chances.