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Old 01.10.2020, 07:57
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Verbier Verbier is offline
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Re: Put a lid on it- the other one is broken

Since we do not know any of the specifics of the house (age etc.) we can only talk in generalities.

If you are re-doing the roof the range of what can be done / needs to be done can vary widely. If you are going to put on new tiles (normally only needs to be done after 40+ years) you would take advantage and add/replace insulation so it is insulated as well as possible. In CH I find that they do not put as much insulation as they could. Not only for the cold but also for the summer heat (depending on where you are in the country this is becoming more important). Insulation technology and product availability has improved immensely in the last 40 years.

In any event it is recommended to do the insulation as a first step before installing solar panels.

As mentioned, it is very important to have a thorough inspection of the roof to understand if there are issues with the joists, rot, mould etc. which will have a major impact on the repair cost. Correct vapour barriers are also very important.

Depending on the age of the house and the canton, there may be some tax or other advantages to re-doing the roof. Have a look.
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