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Be careful where you hire it from as some hire firms will insist that they see evidence of a PASMA qualification when they drop it off and if you can't do this will take the tower away and keep the cash.
It's not a CPA hire condition and although there's nothing to stop the hirer imposing additional conditions, it's an odd position to take as they have no duty of care in this regard.
What's definitely not on, is to impose undeclared conditions and then keep your money when you fail to meet them.
I wouldn't use ct1 flash band and flash band primer would give you longer lasting results. The only thing that would beat it would be proper lead flashing.
While you're up there worth checking that there actually is a fall on the flat roof (should be around 1:10) and that it falls away from the house, I know it's obvious but the number of DIYers that get this wrong is significant. If this isn't the case then the work will be more than you initially thought.
Also with the access towers (decorators platform). Be careful where you hire it from as some hire firms will insist that they see evidence of a PASMA qualification when they drop it off and if you can't do this will take the tower away and keep the cash.