Hello,
I have a question regarding the attic... In our house, both the ceiling between the upper floor and the attic and the sloped roof are fully insulated up to the ridge.
The controlled ventilation system for the living space is installed in the attic, and otherwise, the area is used for storage.
What I’m wondering currently is, since there are no windows there, whether the attic space should also be ventilated.
There are no particular problems or defects that bother me; the main issue is the dusty, stale air when spending time there (which makes sense, since where else would fresh air come from).
Does it make sense to include the attic in the controlled ventilation system, or is it better to leave it as it is?
I have a question regarding the attic... In our house, both the ceiling between the upper floor and the attic and the sloped roof are fully insulated up to the ridge.
The controlled ventilation system for the living space is installed in the attic, and otherwise, the area is used for storage.
What I’m wondering currently is, since there are no windows there, whether the attic space should also be ventilated.
There are no particular problems or defects that bother me; the main issue is the dusty, stale air when spending time there (which makes sense, since where else would fresh air come from).
Does it make sense to include the attic in the controlled ventilation system, or is it better to leave it as it is?
P
Peanuts7410 Dec 2015 11:48The "double" insulation is actually quite common. In houses with Unilin roofs, the entire roof space is insulated. As someone mentioned before, this has the advantage that the temperature stays above 10°C (50°F) in winter and doesn’t turn into a sauna in summer.
For additional insulating effects, you can of course also insulate the ceiling between the upper floor and the roof space. You can still clearly feel the difference in temperature there without a thermometer. With an outside temperature of 0°C (32°F) and about 20°C (68°F) in the upper floor, it’s around 13°C (55°F) under the roof, so there is definitely an insulating effect which a simple drywall wouldn’t provide, while still being "warm" enough to store clothes and other items in the roof space.
Therefore, I cannot agree with those who say this is nonsense.
For ventilation, we have small openings with flaps right at the ridge, which allow a little airflow...
For additional insulating effects, you can of course also insulate the ceiling between the upper floor and the roof space. You can still clearly feel the difference in temperature there without a thermometer. With an outside temperature of 0°C (32°F) and about 20°C (68°F) in the upper floor, it’s around 13°C (55°F) under the roof, so there is definitely an insulating effect which a simple drywall wouldn’t provide, while still being "warm" enough to store clothes and other items in the roof space.
Therefore, I cannot agree with those who say this is nonsense.
For ventilation, we have small openings with flaps right at the ridge, which allow a little airflow...
Bieber0815 schrieb:
I read that, but I still don’t understand why the attic is insulated on all sides. Does Controlled Residential Ventilation mean that devices and equipment for the controlled residential ventilation system are installed in the attic? Does this require comprehensive insulation? What kind of equipment are these? Where can I find more information about this?As a graduate engineer, one would probably understand this best.
Back to the topic... Sorry for the late update on what happened next. The attic is also ventilated through the controlled residential ventilation system. There were still some available connection ports on the distribution box, and I am now using one of them. It is definitely more comfortable up there now.
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stefanc8421 Sep 2017 23:06It seems that several people who have posted here have a system installed in the attic. Does anyone have it placed on the wooden ceiling or mounted on the wooden wall? If so, what has your experience been regarding noise levels?
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Steffen8022 Sep 2017 08:18Our attic is the same. The ceiling to the upper floor is made of concrete plus insulation, and the roof is insulated all the way up and finished with drywall. The mechanical ventilation system is also installed up there. We solved the ventilation issue as follows: the attic is connected to the mechanical ventilation system—so ventilation is ensured whenever the system is running. If the mechanical ventilation system is not running, a window automatically opens when a certain humidity level is reached.
Hello,
I came across this post and would like to know about your experiences.
For my new build, I plan to insulate the collar beam layer with 240mm 035 Isover (9.4 inches) and do this directly between the rafters all the way up to the ridge.
I also intend to install the mechanical ventilation system in the attic.
1. Did you route the ducts without insulation through the collar beam layer to the side, and then lay them on the floor towards the distribution units?
2. Have you encountered any mold issues?
3. For the supply and exhaust air ducts through the roof, what minimum distance should be maintained?
4. Did you include the attic space in the ventilation calculation, or just ventilate it at the lowest fan setting?
5. How did you seal the vapor barrier?
I came across this post and would like to know about your experiences.
For my new build, I plan to insulate the collar beam layer with 240mm 035 Isover (9.4 inches) and do this directly between the rafters all the way up to the ridge.
I also intend to install the mechanical ventilation system in the attic.
1. Did you route the ducts without insulation through the collar beam layer to the side, and then lay them on the floor towards the distribution units?
2. Have you encountered any mold issues?
3. For the supply and exhaust air ducts through the roof, what minimum distance should be maintained?
4. Did you include the attic space in the ventilation calculation, or just ventilate it at the lowest fan setting?
5. How did you seal the vapor barrier?
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