Knallkörper
2016-09-21 14:47:43
- #1
Hello everyone,
at our construction project, the formwork (under roof) made of boards is now installed on the rafters, on top of which there is a vapor-permeable underlay membrane, followed by counter battens and battens as well as roof tiles.
I want to have a so-called cold roof. There should be an insulation between the rafters in the area of the roof slopes on the upper floor, as well as insulation of the attic floor. So in the attic, I could see the boarding from the inside.
If I am correctly informed, the insulation between the rafters should be about 4 cm thinner than the thickness of the rafters. I then have an air gap of 4 cm between the boarding and the mineral wool. According to my idea, this air gap would be visible from the attic and ventilate into the attic.
The ventilation of the attic could either be via the ridge (as it is now) or via ventilation openings in the gable (difficult because of the half-hipped roof). How is the "fresh air" now brought in at the eaves? Sufficient air from outside must be able to enter the gap between the boarding and the mineral wool. From outside we have brickwork, which is built from the bottom up to under the rafters and into the rafter spaces. In the rafter field, there must now be an open gap of about 4 cm so that I get a sufficient fresh air cross-section. How is it ensured that no insects get in here? Is that even possible? How does that look visually, does anyone perhaps have a photo of it?
Does the mineral wool on the upper side, i.e. in the gap, still need to be fastened and protected or does it just lie there openly?
My architect is on vacation ;) It would be nice if someone with experience could give me a bit of feedback on this!
at our construction project, the formwork (under roof) made of boards is now installed on the rafters, on top of which there is a vapor-permeable underlay membrane, followed by counter battens and battens as well as roof tiles.
I want to have a so-called cold roof. There should be an insulation between the rafters in the area of the roof slopes on the upper floor, as well as insulation of the attic floor. So in the attic, I could see the boarding from the inside.
If I am correctly informed, the insulation between the rafters should be about 4 cm thinner than the thickness of the rafters. I then have an air gap of 4 cm between the boarding and the mineral wool. According to my idea, this air gap would be visible from the attic and ventilate into the attic.
The ventilation of the attic could either be via the ridge (as it is now) or via ventilation openings in the gable (difficult because of the half-hipped roof). How is the "fresh air" now brought in at the eaves? Sufficient air from outside must be able to enter the gap between the boarding and the mineral wool. From outside we have brickwork, which is built from the bottom up to under the rafters and into the rafter spaces. In the rafter field, there must now be an open gap of about 4 cm so that I get a sufficient fresh air cross-section. How is it ensured that no insects get in here? Is that even possible? How does that look visually, does anyone perhaps have a photo of it?
Does the mineral wool on the upper side, i.e. in the gap, still need to be fastened and protected or does it just lie there openly?
My architect is on vacation ;) It would be nice if someone with experience could give me a bit of feedback on this!