Maya2011
2011-06-09 10:46:45
- #1
Hello,
even though there have already been similar questions here, I will open a new topic.
We are planning a new build and are now in the process of comparing the insulation in the exterior walls, basement, roof, etc.
We want to build solid with a double-shell masonry made of aerated concrete.
The construction companies all insulate the exterior wall with mineral wool in a thickness of 8 to 14 cm, WLG 035.
For the roof insulation, there is always an insulation between the rafters of 20-24 cm WLG 035. And in the attic, the roof is only insulated if a conversion is desired. However, if it is financially feasible for us, we also want to have this insulated.
Now the first question: can you recommend insulation with mineral wool? And if so, which thickness should one choose, and should one demand a WLG 032???
Of course, better insulation is better. But what really makes sense when I compare investment costs to possible heating savings?
Then we also consulted a civil engineer who individually plans and has houses built. He had a crisis when given the information from the housebuilding companies.
He recommends insulation with polyurethane boards of WLS 024 and 20-24 cm thickness.
For the roof, he recommends a complete rafter insulation with the same material.
Then our exterior wall would have, instead of a U-value of perhaps 0.16 - 0.18 with good mineral wool insulation, a U-value of 0.10- 0.12 with polyurethane (according to info brochure).
Of course, that would be better, but according to his calculation, the house would cost us at least €50,000 more and would no longer be financially feasible for us.
We really want to think this through carefully and do everything as properly and sensibly as possible and would be very, very grateful for professional answers!
Maya
even though there have already been similar questions here, I will open a new topic.
We are planning a new build and are now in the process of comparing the insulation in the exterior walls, basement, roof, etc.
We want to build solid with a double-shell masonry made of aerated concrete.
The construction companies all insulate the exterior wall with mineral wool in a thickness of 8 to 14 cm, WLG 035.
For the roof insulation, there is always an insulation between the rafters of 20-24 cm WLG 035. And in the attic, the roof is only insulated if a conversion is desired. However, if it is financially feasible for us, we also want to have this insulated.
Now the first question: can you recommend insulation with mineral wool? And if so, which thickness should one choose, and should one demand a WLG 032???
Of course, better insulation is better. But what really makes sense when I compare investment costs to possible heating savings?
Then we also consulted a civil engineer who individually plans and has houses built. He had a crisis when given the information from the housebuilding companies.
He recommends insulation with polyurethane boards of WLS 024 and 20-24 cm thickness.
For the roof, he recommends a complete rafter insulation with the same material.
Then our exterior wall would have, instead of a U-value of perhaps 0.16 - 0.18 with good mineral wool insulation, a U-value of 0.10- 0.12 with polyurethane (according to info brochure).
Of course, that would be better, but according to his calculation, the house would cost us at least €50,000 more and would no longer be financially feasible for us.
We really want to think this through carefully and do everything as properly and sensibly as possible and would be very, very grateful for professional answers!
Maya