ᐅ Cold Roof – Are Roof Windows Necessary for Cross Ventilation?
Created on: 9 Feb 2016 21:47
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Julchen_76
Hello everyone,
We are in the final planning phase of our house and are now wondering if, for our planned cold roof, two small roof windows for cross-ventilation are necessary.
Our client advisor says yes, but the general contractor considers them unnecessary.
How did you handle this in your projects?
Good luck, Julia
We are in the final planning phase of our house and are now wondering if, for our planned cold roof, two small roof windows for cross-ventilation are necessary.
Our client advisor says yes, but the general contractor considers them unnecessary.
How did you handle this in your projects?
Good luck, Julia
S
Sebastian7912 Feb 2016 19:54That is probably too slow for this—especially since condensation can occur quite heavily and needs to be managed differently.
S
Sebastian7912 Feb 2016 20:12That's just the way it is.
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nightdancer13 Feb 2016 12:07A properly ventilated cold roof has openings at both the ridge and the eaves. The number and size of these openings are specified in the relevant DIN standard.
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Sebastian7913 Feb 2016 13:17I was referring to a warm roof, which also needs to be ventilated.
Until now, I also thought we had a cold roof since it is uninsulated, but it is not ventilated either. In summer, it gets unbearably hot up there. However, the roof structure shows no signs of decay; it is completely dry up there. Should I install ventilation openings now, or is it better to leave everything as it is, since it seems to be working somehow?
Do the ventilation holes need to lead directly outside, or is it enough if they open into the ventilated cavity of the facade? That way, I wouldn’t have to make a hole in the beautiful new gable wall.
Do the ventilation holes need to lead directly outside, or is it enough if they open into the ventilated cavity of the facade? That way, I wouldn’t have to make a hole in the beautiful new gable wall.
Hello dear forum members,
I’m digging up an old thread because it fits my question well.
The following roof construction is listed in my scope of work.
Is this roof structure okay as described?
The attic is intended to be used as a storage room (instead of a basement) for items that are only needed seasonally (Christmas decorations, suitcases, etc.). I don’t want it to become a heat trap inside, since I’m not always sure which items can tolerate heat (e.g., suitcases made of synthetic fabric). And of course, I don’t want it to turn into a dripping cave.
Do I need any additional ventilation? There is no mention of ventilation grilles in the scope of work. Would it possibly make sense to move the insulation layer from above the ceiling of the first floor directly to the roof? How much more expensive would that be?
Second question: Currently, there is no load-bearing floor planned. That means I would need to install (or have installed) a storage floor myself. I was verbally informed that this is possible, but the supporting structure is designed for a permanent load of only 80 kg/m² (16.4 lbs/ft²). What material or type of floor is recommended so that not too much of the load capacity is “used up” by the floor itself? And what happens if there is a higher point load in some areas (you can’t weigh everything you store up there)? Will the entire ceiling eventually fail, or would there simply be cracks?
Thanks and best regards
Tolentino
I’m digging up an old thread because it fits my question well.
The following roof construction is listed in my scope of work.
Is this roof structure okay as described?
Construction from inside to outside:
Ceiling
- Lightweight boards (plasterboard GK 12.5 mm in Q2 finish)
- Subframe
- Vapor barrier
- Rafters with insulation on the inside
- Foldable attic ladder ClickFix 0.7 x 1.20 m (2.3 x 4 ft), insulated with a U-value of 0.49
Roof
- Vapor-permeable underlay membrane
- Counter battens, battens, and roof tiles
The attic is intended to be used as a storage room (instead of a basement) for items that are only needed seasonally (Christmas decorations, suitcases, etc.). I don’t want it to become a heat trap inside, since I’m not always sure which items can tolerate heat (e.g., suitcases made of synthetic fabric). And of course, I don’t want it to turn into a dripping cave.
Do I need any additional ventilation? There is no mention of ventilation grilles in the scope of work. Would it possibly make sense to move the insulation layer from above the ceiling of the first floor directly to the roof? How much more expensive would that be?
Second question: Currently, there is no load-bearing floor planned. That means I would need to install (or have installed) a storage floor myself. I was verbally informed that this is possible, but the supporting structure is designed for a permanent load of only 80 kg/m² (16.4 lbs/ft²). What material or type of floor is recommended so that not too much of the load capacity is “used up” by the floor itself? And what happens if there is a higher point load in some areas (you can’t weigh everything you store up there)? Will the entire ceiling eventually fail, or would there simply be cracks?
Thanks and best regards
Tolentino
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