Insulating sloped roof in attic.

rmdt

Registered User
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We have floored a section of our attic (new build) and are trying to decide how much insulation to install. The area under the floor will have 9 inches of rockwool installed, over a 37.5mm insulated ceiling slab. (the unfloored part of attic will get 400mm blown rockwool over normal ceiling slab).

In the floored area we have installed 100mm rafterloc between the rafters. We now have to decide what to put on this to finish. The options in my head are:
1. 52mm insulated slab
2. A thinner insulated slab (38mm) so we don't loose as much headroom, which is fairly tight.
3. Ordinary ceiling slab, to keep the maximum amount of headroom.

Its a bit of a compromise between headroom and insulation. Just don't want to spec my insulation too low and undo all the good of having 400mm insulation over the rest of the house.

Attic will only be used for storage, but could be converted at a later stage.

Many thanks for your help, Rmdt.
 
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