A bit late in the day but I've decided to swap from a cold to a warm loft, using Icynene under the felt between the trusses. However I also now realise I need to seal the inner blockwork to help give some air-tightness.
Current options:
* cement render the blockwork - maybe plastering later, should I convert the attic to a habitual space in the long term future
* 1 part water to 4 part PVA mix hand painted onto the block work - tedious and there are 4 large gable ends to do, unknown long term consequence of doing so
What are the options to seal the inner blockwork to increase air tightness?
(Does not need to be particularly pretty)
Thanks
Paul