I am currently busy insulating my unfinished upstairs and am now thinking about the next step, which is to install plastic, attach battens, and then plasterboard.
It is a 1½-story house with sloped ceilings, open to the ridge. I have installed 3 layers of mineral wool boards and have just completed the last layer. The final layer of studs has been set by the carpenter at 120 cm centers. Could it be OK to install plastic, attach horizontal battens 28x70 at 30 cm centers, and then plasterboard, without the risk of the plasterboards sagging over time? Ideally, I would have preferred to use 1200 panels purely for economic reasons as 900 panels are the same price. I didn't think it through and perhaps should have asked the carpenter to set the studs at 60 cm centers instead of 120 cm to reduce the risk, but it's a bit late for that now...
I do not intend to install OSB on the sloped ceilings as it feels unnecessary and serves no purpose.
It is a 1½-story house with sloped ceilings, open to the ridge. I have installed 3 layers of mineral wool boards and have just completed the last layer. The final layer of studs has been set by the carpenter at 120 cm centers. Could it be OK to install plastic, attach horizontal battens 28x70 at 30 cm centers, and then plasterboard, without the risk of the plasterboards sagging over time? Ideally, I would have preferred to use 1200 panels purely for economic reasons as 900 panels are the same price. I didn't think it through and perhaps should have asked the carpenter to set the studs at 60 cm centers instead of 120 cm to reduce the risk, but it's a bit late for that now...
I do not intend to install OSB on the sloped ceilings as it feels unnecessary and serves no purpose.
You can use 120gips if you space at cc30.
600cc is too wide for a ceiling, but you can space at 400cc if you use 120gips.
I was probably a bit unclear in the post. The spacing for the panels should be cc30 between each other, but the distance for attaching the panels is 1200mm - the distance between the roof trusses. This is what I mean when I ask if it should be 600mm instead for more stability for the panels. But maybe it's unnecessary?
