Insulate the roof: flakes, panels or wool

But this is about [Satteldach], see above 1. Different dimensions, 2. different structural conditions!

Update: Construction has now begun. Exciting!

Still open is the question of which insulation we want to use for the gable roof. The following options are available:

Mineral wool: €2,652
Cellulose insulation: approx. €2,945
Wood fiber boards €3,966
(each for the entire roof, all excluding VAT)

Our thermal protection certificate works with all types of insulation.

The architect likes the cellulose loose-fill insulation very much but cannot give us any long-term experience regarding dimensional stability (concern: possible compression). The carpenter prefers the wood fiber boards, especially because of (alleged) better dimensional stability, better sound insulation properties, greater ecological quality, and better summer heat protection.

In our case, the bedrooms on the upper floor (children’s room and master bedroom) will extend up to just below the roof ridge. Therefore, the summer heat protection of the insulation should not be neglected.

Perhaps someone here has faced similar questions and can give us advice?

Thanks and regards.
Fabian

Will you finally tell us now, after almost 4 months, about the planned or already existing roof structure?

Update: Construction has now begun. Exciting!

Still open is the question of which insulation we want to use for the pitched roof. The following options are available:

Rock wool: €2,652
Cellulose insulation: approx. €2,945
Wood fiber boards: €3,966
(each for the entire roof, all prices excluding VAT)

Our thermal insulation certificate works with all types of insulation.

The architect likes the cellulose flake insulation very much but cannot give us any long-term experience regarding dimensional stability (concern: possible compression). The carpenter favors the wood fiber boards, especially due to (alleged) better dimensional stability, better sound insulation properties, higher ecological quality, and better summer thermal protection.

In our case, the bedrooms on the upper floor (children’s room and master bedroom) will extend up to the roof ridge. Therefore, the summer thermal protection of the insulation should not be neglected.

Maybe someone here has faced similar questions and can give us some advice?

Thanks and regards.
Fabian

without specifying thickness and U-value, this is just guesswork

Will you now reveal to us, after almost 4 months, the planned or already existing roof structure?

I had overlooked your above original inquiry. Sorry.

The following information from the carpenter’s contract specifications:
"Rafter roof. Rafters are clad on the underside with a vapor-tight OSB sheathing. On the upper side, the rafters are clad with a vapor diffusion-open and wind-tight under-roof board. Counter-battens and roof battens are installed on the under-roof board. The thermal insulation is made as blown-in cellulose fiber insulation as insulation between the rafters."

without specifying thickness and U-value, it’s just guessing

Blown-in insulation:
Thickness of insulation layer approx. 220 mm
Thermal conductivity λ (DIN 4108): 0.038 W / m x K

or

Mineral wool:
Insulation layer thickness: 240 mm
Design thermal conductivity value: 0.035 W/(mK) according to
Approval Z-23.15-1468

I do not have the offered data for wood fiber boards on hand at the moment.

Regards.
Fabian

Oh. Are you sure you're building with an architect? That looks more like a general contractor/main contractor, given how confusing it is.

In principle, the structure is suitable for blown-in insulation if the rafter spacing, etc., is known. but: why only 220 mm flakes and 240 mm stone wool, is that a typo or ? There must be steam inside the box?? :D