Shikara
2011-02-08 16:46:21
- #1
Hello everyone,
I hope there is someone here who can help me...
We are close to signing the contract for our new construction project. We are building an angled bungalow with 120 sqm on the ground floor. Since a roof pitch of 40° is specified according to the development plan, we have decided to convert a 20 sqm room in the attic. The rest of the attic space will be used as storage. This area will also be insulated.
Now we have since had a consultation with the Bauherren-Schutzbund, who pointed out some things to us. Unfortunately, these again cause considerable additional costs, so I would like to know what you think of them. Are they really necessary or is it also sufficient to build one "level" lower? Specifically, I have the following questions:
1. The base slab and strip foundations are made of reinforced concrete, insulated with extruded polystyrene rigid foam board WLG 035. Now the Bauherren-Schutzbund recommended that the insulation under the slab should be load-bearing, approved perimeter insulation, e.g. CS 5000. Also, lateral perimeter insulation (edge insulation) is important. We are now being offered edge insulation in the slab area (omission of insulation under the slab, but 18 cm floor buildup) and masonry insulation with moisture-resistant PUR rigid foam insulation thickness 14 cm, WLG 024. Additional cost: €4,900
2. The Bauherren-Schutzbund recommends that the surfaces (walls and door) of the upper hallway (separation from the storage area in the attic) be particularly well insulated and that attention be paid to a drop seal on the hallway door to the storage room in order to prevent heat from the ground floor from entering the storage room. We have now been offered to achieve airtightness with a climate membrane sd = 0.2 - 5.0 m, brand Isover Vario KM. Additional cost: €1,100
3. We were told that the front door is still not particularly well insulated nowadays, in contrast to the masonry. In the offer we have a door 2.01 m, costing €3,200. Alternatively, an aluminum front door "Cotherm", thickness 10 cm, has now been offered. Additional cost: €3,000
4. Lastly, a question about the roof truss and the wood used. Our roof truss is offered as standard made of wood grade S10. The Bauherren-Schutzbund has now recommended that we use structural solid wood. Additional cost: €1,620
So, that’s it for now. I would be very grateful if there were a well-founded opinion here on what would be best for us, although I have to say that I am already aware that the above-mentioned design changes represent an improvement over the standard. I just want to know if they are absolutely necessary and sensible. I do not want to save in the wrong place!
A thousand thanks for your help!!
Unfortunately very uninformed Shikara
I hope there is someone here who can help me...
We are close to signing the contract for our new construction project. We are building an angled bungalow with 120 sqm on the ground floor. Since a roof pitch of 40° is specified according to the development plan, we have decided to convert a 20 sqm room in the attic. The rest of the attic space will be used as storage. This area will also be insulated.
Now we have since had a consultation with the Bauherren-Schutzbund, who pointed out some things to us. Unfortunately, these again cause considerable additional costs, so I would like to know what you think of them. Are they really necessary or is it also sufficient to build one "level" lower? Specifically, I have the following questions:
1. The base slab and strip foundations are made of reinforced concrete, insulated with extruded polystyrene rigid foam board WLG 035. Now the Bauherren-Schutzbund recommended that the insulation under the slab should be load-bearing, approved perimeter insulation, e.g. CS 5000. Also, lateral perimeter insulation (edge insulation) is important. We are now being offered edge insulation in the slab area (omission of insulation under the slab, but 18 cm floor buildup) and masonry insulation with moisture-resistant PUR rigid foam insulation thickness 14 cm, WLG 024. Additional cost: €4,900
2. The Bauherren-Schutzbund recommends that the surfaces (walls and door) of the upper hallway (separation from the storage area in the attic) be particularly well insulated and that attention be paid to a drop seal on the hallway door to the storage room in order to prevent heat from the ground floor from entering the storage room. We have now been offered to achieve airtightness with a climate membrane sd = 0.2 - 5.0 m, brand Isover Vario KM. Additional cost: €1,100
3. We were told that the front door is still not particularly well insulated nowadays, in contrast to the masonry. In the offer we have a door 2.01 m, costing €3,200. Alternatively, an aluminum front door "Cotherm", thickness 10 cm, has now been offered. Additional cost: €3,000
4. Lastly, a question about the roof truss and the wood used. Our roof truss is offered as standard made of wood grade S10. The Bauherren-Schutzbund has now recommended that we use structural solid wood. Additional cost: €1,620
So, that’s it for now. I would be very grateful if there were a well-founded opinion here on what would be best for us, although I have to say that I am already aware that the above-mentioned design changes represent an improvement over the standard. I just want to know if they are absolutely necessary and sensible. I do not want to save in the wrong place!
A thousand thanks for your help!!
Unfortunately very uninformed Shikara