ᐅ Insulating the Attic Space: How to Avoid Common Mistakes?

Created on: 22 Jul 2019 12:50
M
M4rvin
Hi! In our single-family house, only the ceiling between floors has been insulated. We were told, however, that the attic space should definitely be insulated as well, since otherwise, stored items would be exposed to extreme temperature fluctuations.
I did some research online, but apparently, it’s also easy to make mistakes that could even damage the roof structure!
How exactly should I proceed now?

Thanks in advance
Marvin

Dachgeschoss-Schnitt: Dachstuhl, Spitzdach, OG, Flur, Kind 2, Treppe.


Traufdetail M. 1:20 – Querschnitt Dachaufbau mit Sparren, Dämmung und Dachhaut.
J
Joedreck
24 Jul 2019 10:56
Yes, moisture is an issue. Especially when insulation is involved, there can be problems with the dew point. You need to be careful with that.

In our old house, we used the attic as a storage area, and it wasn’t very convenient. The steep stairs weren’t pleasant to use.

With the new house having two full floors, it would be easier to use the attic. However, we deliberately decided not to make it accessible. I would either make the attic heated and fully usable by installing a fixed staircase, or just leave it unused.
A
apokolok
24 Jul 2019 11:47
Moisture should not be an issue at all, especially in an uninsulated cold roof.
seat8824 Jul 2019 12:00
apokolok schrieb:

Moisture shouldn’t be an issue at all, especially with an uninsulated cold roof.

I completely agree. We have a sensor from the hygrometer in every room, and in the attic it’s often around only 35%...
J
Joedreck
24 Jul 2019 12:55
Theoretically not, that's correct. But in practice, it can happen with faulty workmanship. And it really needs to be planned carefully.
With an uninsulated, ventilated cold roof, problems rarely occur. If warm air enters the insulated attic, it will condense there. Therefore, airtightness between the upper floor and the attic must be executed with great precision.
N
nix zu schwör
24 Jul 2019 13:32
Temperature is not the problem, but humidity.
Ventilating through roof windows during hot summer temperatures brings warm and humid air into the attic space. Therefore, keep windows closed as long as it is warmer outside than inside.
In winter, however, open the windows so that cool but dry air can enter the attic space.
L
Lumpi_LE
24 Jul 2019 14:14
Exactly, because an attic is airtight and usually also has roof windows...
100 points to the candidate in purple.