Install the vapor barrier afterwards, how to cover the vapor barrier foil?

Hello,

I have noticed that in an unheated attic room, no vapor barrier was installed. It was insulated with rock wool between the rafters and clad with wooden panels. I realized this after the room smelled somewhat sour during strong temperature fluctuations outside.

Question: could I leave the wooden panels as they are, apply vapor barrier sheets, seal them on the walls, and cover the foil with new panels, finished. This would have the advantage that a nice substructure would remain due to the existing panels, and an optimal sealing of the foil on the walls could be achieved.

I am grateful for any answers.

Regards Hansi 65

Hi, how is the room being used? Storage room? Is the room in the attic or in the loft? Are there more rooms there? If yes, how was it done there? Please describe exactly..... Regards

Hello,

the room is located in the attic, has three sides with brick walls, the fourth side is a sloping roof, which transitions into a short ceiling section, above that is the [Spitzboden]. The adjacent rooms are heated. We store drinks and toys in it, and it is frequented several times a day. The remaining sloping roof and ceiling as well as the [Spitzboden] have vapor barrier foil.

I will remove the wooden panels, install a vapor barrier, and attach the foil to the substructure with thin battens. The space that arises between the foil and the panels might be favorable for drying condensation water.

Regards, Hansi 65