danabanana
2021-09-05 19:57:06
- #1
Hello,
for our next construction phase, I would appreciate a few second opinions on the further course of action proposed to us.
Our exterior walls consist of a base made of hewn granite stones, above which are walls made of field-fired bricks; the house is about 100 years old. There is no insulation in the walls. The exterior facade is to be retained, so interior insulation with diffusion-open insulation boards (Multipor or wood fiber boards) is planned.
Currently, the floor consists of wooden boards laid directly on the clay soil. To level out unevenness, a layer of sand between 0 and about 10 cm thick was used under the wood. The floor starts above the first row of bricks, about 8 cm above the granite base. Between the granite and bricks, there is now a bituminous layer that is rather no longer to be taken seriously. The indoor floor level is about 80 cm higher than outside the house.
The goal is to achieve an insulated concrete floor including underfloor heating for the direct installation of a suitable floor covering without additional screed. Furthermore, a transition of the floor insulation to the wall insulation without thermal bridges is naturally sought. The interior will later be plastered with clay or lime plaster.
After an initial consultation with the specialist advisor at the building materials dealer (not a hardware store :)), the following floor structure was proposed to us.
For illustration, I am attaching a sketch.
The rooms will be excavated about 40 cm deep inside, in the edge area along the exterior walls about 60 cm, about 20 cm wide. A reinforced ring foundation (about 20 cm wide and 30 cm high) is to be laid in the deeper excavated area along the exterior walls to stabilize the exterior walls. The foundation will receive a thick coating that reaches up to the second row of bricks.
On the excavated clay soil, a gravel bed will be laid up to the top edge of the new foundation. Approximately 10 cm height was proposed to us here. On top of that, a tank made of XPS is to be installed, which reaches all around up to the base walls or the thick coating. The wall insulation is to be continued later directly on the upward facing cut edges of the XPS boards.
The concrete slab should be poured into the XPS tank. A thickness of 18 to 20 cm with double reinforcement was proposed to us here. The pipes for the underfloor heating should lie about 2-3 cm below the top edge of the concrete.
What do you think of the construction idea?
Do you see major weak points or potential problem areas?
Thanks for your assessments
PS: On the outside, a drainage with gravel bed and dimpled foil is additionally to be installed, and the currently dilapidated gutters are being repaired.
for our next construction phase, I would appreciate a few second opinions on the further course of action proposed to us.
Our exterior walls consist of a base made of hewn granite stones, above which are walls made of field-fired bricks; the house is about 100 years old. There is no insulation in the walls. The exterior facade is to be retained, so interior insulation with diffusion-open insulation boards (Multipor or wood fiber boards) is planned.
Currently, the floor consists of wooden boards laid directly on the clay soil. To level out unevenness, a layer of sand between 0 and about 10 cm thick was used under the wood. The floor starts above the first row of bricks, about 8 cm above the granite base. Between the granite and bricks, there is now a bituminous layer that is rather no longer to be taken seriously. The indoor floor level is about 80 cm higher than outside the house.
The goal is to achieve an insulated concrete floor including underfloor heating for the direct installation of a suitable floor covering without additional screed. Furthermore, a transition of the floor insulation to the wall insulation without thermal bridges is naturally sought. The interior will later be plastered with clay or lime plaster.
After an initial consultation with the specialist advisor at the building materials dealer (not a hardware store :)), the following floor structure was proposed to us.
For illustration, I am attaching a sketch.
The rooms will be excavated about 40 cm deep inside, in the edge area along the exterior walls about 60 cm, about 20 cm wide. A reinforced ring foundation (about 20 cm wide and 30 cm high) is to be laid in the deeper excavated area along the exterior walls to stabilize the exterior walls. The foundation will receive a thick coating that reaches up to the second row of bricks.
On the excavated clay soil, a gravel bed will be laid up to the top edge of the new foundation. Approximately 10 cm height was proposed to us here. On top of that, a tank made of XPS is to be installed, which reaches all around up to the base walls or the thick coating. The wall insulation is to be continued later directly on the upward facing cut edges of the XPS boards.
The concrete slab should be poured into the XPS tank. A thickness of 18 to 20 cm with double reinforcement was proposed to us here. The pipes for the underfloor heating should lie about 2-3 cm below the top edge of the concrete.
What do you think of the construction idea?
Do you see major weak points or potential problem areas?
Thanks for your assessments
PS: On the outside, a drainage with gravel bed and dimpled foil is additionally to be installed, and the currently dilapidated gutters are being repaired.