Insulating cathedral\vaulted roof

Insulating cathedral\vaulted roof

Insulating cathedral\vaulted roof

Inquiry about completing a newly constructed cathedral/vaulted roof.

Rafters with a depth of 220mm

My current plan consists of the following:

- 50mm air gap (below the roof membrane)
- 120mm rigid board insulation
- 50mm gap/service void
- Plasterboard
- Skim coat

Questions:
*Is it acceptable to maintain the 50mm gap/service void above the plasterboard, or does the insulation need to be flush against the insulation for optimal efficiency? The reason for the 50mm gap/service void before...

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by Steveb21

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