100% agree
I do loads of external insulation
man’s while it’s a great solution It would leave your home with lots of straight lines
I would line the inside
It just stops it rusting over time
We normally use stainless screws and 40 mil washers
A galvanized mesh is ok also if your having trouble getting stainless
But stick with stainless fixings
The problem with sash is The mechanism can’t be made as airtight as other windows We are happy with ours as it was a planning condition
But not on our current build
No backer needed
But as with tiles you need to be careful of anything bleeding through limestone
Use a tile sealer or SBR Ideally on two separate days If not allow a couple of hours between coats
Definitely a red flag
If they are last years accounts the fines will probably be more than the cost of your kitchen
Ours ran over by a couple of days one year and we were fined £240 for those two days
Your looking about 30 tone of building and a 20 and a 10 Check the air charge for 10 Last time I bought a delivery from the query 10 an 20 where about the same
In the 30 plus years since your BB was installed It hasn’t change All allow for airflow to prevent a buildup of stale air Blocking this isn’t a good idea