I have a factory roof I need to get some isolation from & am trying to work out the best way to do this without losing too much height.
The roof consists of corrugated asbestos, sarking, steel mesh (to support the sarking I guess), steel girders & then the timber frame for the ceiling attached to the girders, as per the photo below.
There are two options I'm considering:
1. Stuff the cavity with insulation, then hang a plasterboard ceiling using RC2.
I'm concerned there may not be enough isolation with this option since, of the two leaves in this structure, one would only be thin asbestos.
2. Put a layer of plasterboard up first, behind the timber, then stuff with insulation & then hang the ceiling with RC2.
With this option I'm worried that the extra layer of plasterboard will act as a third leaf (or that the asbestos will) & have a negative effect.
Unfortunately I can't attach the plasterboard directly to the existing roof material to make it a single leaf.
What are your opinions? Are there other options to consider?
Basically I'm just looking for the best isolation I can get without having to lose much height in the room or remove any of the existing roof structure.
Thanks,
Glenn