ᐅ Energy Saving Regulations for Full-Formwork Construction, Roofer, Balcony with Full-Formwork

Hello, I have a question and I hope you can help me:

About 25 years ago, my roof was insulated with 80mm (3 inches) of insulation between the rafters. There is a solid sheathing on the beams, and the interior is fully finished.
Now, I would like to have my roof re-covered, but if possible, without having to add extra insulation.

I spoke with a roofer who told me that I don’t need additional insulation because the existing solid sheathing would make it very complicated, and therefore the current energy saving regulations would not apply.

My main question is whether this statement is correct, as it would obviously be best for me.

Thank you in advance!

Karl57 schrieb:
...My roof was insulated about 25 years ago with 80mm (3 inches) insulation between the rafters. There is a solid boarding on the joists, and the interior is fully finished.

What type of roof is it? Pitched or flat? What is beneath the roof? Heated living spaces? What is the rafter height? More than 80 mm (3 inches)? It’s not that simple! ;-) Minimum U-values apply and must be met.

Karl57 schrieb:
...I visited a roofer who told me I didn’t need to add insulation because the existing solid boarding would make the work very complex and the current energy saving regulations would not apply.

An exemption (§25 Energy Saving Ordinance) would require an expert report proving economic disadvantage! The roofer does not have planning authority; that responsibility lies with the builder. Therefore, the builder is always responsible for complying with applicable laws.

Karl57 schrieb:
.....because that would obviously be best for me?

This is something worth reconsidering.

Best regards.