"Christian McArdle" wrote in message
et...
Can you describe your roofing system and cost. It seems just what I'm
after - I was considering using the warm roof insulation battens
available from Screwfix.

Firstly, it requires the entire roof covering, battens and felt (if
present)
to be removed. It isn't a simple retrofit job. Basically, it can't be done
with the conventional roofing felt in place. The breathable sarking
membrane
is ESSENTIAL to allow the wooden rafters to remain dry.

--------+------------+----------- Slates/tiles
--------+------------+-----------
################################# Battening
## Counter battening
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Breathable sarking membrane
----+----+-----------------------
| |
|R'tr| Kingspan Thermapitch 75mm Insulation + Rafters
| | TP10 zero ODP
----+----+-----------------------
Kingspan Thermawall TW56 zero ODP 25mm Insulation
---------------------------------
--------------------------------- 12.5mm Plasterboard


If you want 12.5mm more height, you can get the 25mm insulation with paper
rather than foil covering and then plaster skim this.