ᐅ Retrofitting Roof Insulation with a Crawl Space

Hello,
my name is Torsten and I am new here.

We recently bought a detached house built in 1965. After the initial renovation work and moving in, I am facing the following problem/question.
Our house has an upper floor with crawl spaces on the left and right sides. The roof itself still looks good but has no insulation, which I would like to add. Of course, there is no roofing underlay (underlayment) either, so I am wondering if there is a reliable way to insulate the roof without an underlay? If that is not effective, would it make sense to insulate the walls of the rooms adjacent to the crawl spaces and the ceiling of the ground floor? The area where the rooms on the upper floor extend up to the roof has apparently been insulated somehow. How exactly, I cannot say as I have not opened it up yet.

Best regards and have a nice weekend!

Moshist schrieb:

The section where the rooms extend from the upper floor up to the roof has apparently been insulated.

If I understand correctly, this concerns knee walls, which are partially accessed as storage rooms – in that case, I would probably install the insulation on the floor (and on the knee walls) – as well as some rooms with exposed underside of the roof. Photos – or possibly a cross-section drawing – might be helpful for more details. Is there a third type of room (with an attic above) as well?

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https://www.instagram.com/11antgmxde/
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Here are some pictures of the situation.

Please sketch the floor plan as well.

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

Approximately like this

Where are the access points to the knee walls, and what do you plan to use them for?

Moshist schrieb:

The section where the rooms from the upper floor extend up to the roof has apparently been insulated. I’m not exactly sure how, as I haven’t opened it yet.

I suspect the insulation may no longer meet current standards. It can still be left as is, but the adjacent areas should be treated with similarly low-quality insulation to avoid creating thermal bridging between neighboring sections.

Unfortunately, I’m not an expert in this field and mostly limit myself to asking you questions to gather more details, so that others can hopefully provide suitable solutions.

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/