ᐅ Ventilation in Insulated Attics

Created on: 28 Oct 2014 11:14
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Illo77
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?
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Saruss
7 Nov 2014 06:38
Central "Kontrolled Wohnraum Lüftung" systems need to be frost-free, meaning at least placed in an insulated space.
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Kardionaut
7 Nov 2014 17:04
I’m just an amateur, but the question is how and with what the insulation is done. For example, if you have a vapor-permeable exterior rafter insulation, theoretically it can’t develop mold. But as I said, I really don’t know much about it.
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Illo77
10 Nov 2014 09:17
Saruss schrieb:
Central "Controlled Mechanical Ventilation" systems should be installed in frost-free areas, at least within insulated spaces.

Exactly =)

In addition, this way the rest of the attic can be used as a frost-free storage area (since we don’t have a basement)... especially for all the children’s clothes, toys, child seats, strollers, sleds, etc., which are only used for a limited time (for example, clothes from the first child being stored somewhere for the second child).

The insulation is 240 mm (9.5 inches) of glass wool 035 installed between rafters.
Musketier10 Nov 2014 19:06
In the list, I find it interesting that items which are usually exposed to frost, such as child seats, sleds, and strollers, are specifically recommended to be stored frost-free. Our main concern is rather with liquids like leftover paint, delicate Christmas decorations, and similar items.
Musketier11 Nov 2014 11:45
Illo77 schrieb:
You could try storing something like that in a garage or carport... I’m just saying, mold…

What I meant was more that you wouldn’t need to insulate and heat the attic separately because of the items listed. That would also work with a cold roof. However, due to the controlled residential ventilation, this cannot be changed.
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alexm86
25 Nov 2015 14:42
Hello @Illo77, how does everything look after one year? Have you made any changes or left everything as it was?