To be honest that isn't too bad. WHen I got my flat I had about 7cm of stuff but all pushed to the side, so no loft insulation in effect. Now with proper rockwool at ~27cm thick (like yours) rolled out on top things are a lot better.
For lights, what I've done is got the units which have an integrated cap, so the insulation can be layed ontop
For me I have the horizonal section of trusses about 50cm above the floor/ceiling so can climb and store on those.
You can get lift stilts to add a storage deck, above
Yeah it was more than I expected, we had one or two chilly nights last week but I think some of that is just getting used to a bigger place and how much longer it takes to heat up.
I think there's room for improvement still especially upgrading the hatch to something more airtight.
To be honest that isn't too bad. WHen I got my flat I had about 7cm of stuff but all pushed to the side, so no loft insulation in effect. Now with proper rockwool at ~27cm thick (like yours) rolled out on top things are a lot better.
For lights, what I've done is got the units which have an integrated cap, so the insulation can be layed ontop
For me I have the horizonal section of trusses about 50cm above the floor/ceiling so can climb and store on those.
You can get lift stilts to add a storage deck, above