ᐅ Attic Ventilation

Hello,

I'm already in the middle of construction and have a question. I didn't plan a window in the attic because it won't be used as a living space. Is it problematic to leave the attic without a window? I'm worried that there might be mold later due to insufficient ventilation.

Does anyone have experience with attics without windows?

Thanks in advance

My attic does not have a window. However, in my case, the attic is located outside the airtight building envelope. In other words, the vapor barrier ends below the attic. So far, I have not had any mold there, but I would not use the space to store valuable items.

As @Wastl has already mentioned, it is important to distinguish whether the attic space is inside or outside the insulation layer.

When insulation extends up to the ridge, ventilation is definitely recommended to prevent mold.

If the attic is outside this insulation layer, ventilation is not strictly necessary but still advisable.

For this reason, we installed a few vent tiles in the roof – this is completely sufficient.

Best regards,

Dirk

If the mechanical ventilation system is installed in the attic, you can use it for ventilation as well – at least that’s how I do it, and I hope it works.

If the attic is not insulated, it is also not airtight – air will leak in there anyway.

I just spoke with my architect again. The attic will be insulated, and ventilation bricks with ducts will be installed, with the ducts protruding below the insulation. Since the roofers haven’t started yet, I’m going to add two small roof windows. It’s not absolutely necessary, but since I have a fairly large attic, I’d rather do it.

And why? Do you want to keep the windows open all the time? Why are you even insulating?