ᐅ Are wood fiber insulation boards suitable for thermal insulation?

Hello,

I have been reading this wonderful forum for some time now. I finally managed to register and would like to start with a question.

Our roofer recommended installing additional cavity insulation. It should be 160 mm (6 inches) thick, and his suggestion is to use mineral wool combined with wood fiberboard panels for this extra insulation. He mentioned that the attic already has excellent thermal insulation. Our architect was also enthusiastic about this.

However, this will cost extra, and a rough estimate puts it at an additional 3,500 Swiss francs.

At the hardware store, an employee said that the mineral wool alone provides good insulation. Now I am a bit uncertain and would like to ask for your opinions here.

What experiences have you had, and is it worthwhile to use mineral wool as insulation?

Do the wood fiberboard panels offer any additional benefits?

These panels are supposed to maintain their functions for several decades.

Thank you in advance.
Best regards

I believe the architect was enthusiastic about it. However, the main concern is the heat in summer, and I think that is what this is really about. I don’t find this additional insulation to be practical, as there are other options available. At this point, the window areas should be considered, and often blinds or shutters can be helpful.

But one thing I’m sure of is that these panels do improve thermal insulation, so now the investment needs to be carefully weighed.

Good luck with that.

Hello Bastian,

He is talking about the roof, not the window facade. However, 160 mm (6.3 inches) seems rather insufficient to me.

Kind regards
Regina

Yes, Regina, that is correct. So, what comes next?
I am looking forward to your answers.

Well, hope dies last. But I think 160 mm (6.3 inches) of mineral wool as the only insulation is somewhat insufficient, isn’t it?

However, I do believe that summer heat protection also plays a role. Most rooms under gable roofs get natural light through the gable wall, so that does matter.

Wishing you a wonderful day.

Hey

I'm not an expert, but additional insulation can definitely make sense. It might also be a minimum requirement.

I would be interested to know what thickness is planned to be installed there?

Best regards