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Thanks, makes sense.
I’m leaning away from solar film and into fitting external solar blinds to our Veluxes.
PS your bottom photo just gave me a massive out of body experience/flashback to opening a big bag of strong skunk when I was 15, which led to me tearing my peroneal tendons.
ectoplasmosis-
I’m leaning away from solar film and into fitting external solar blinds to our Veluxes.
This is the answer, the Bartlett did a paper on overheating in London lofts which is very relevant to me and external shutters are by far the most effective solution (96% effective at reducing overheating degree hours), followed by night-purge ventilation, then solar control film:
https://discovery.ucl.ac.uk/id/eprint/10072870/1/Indoor%20overheating%20and%20mitigation%20of%20converted%20lofts%20in%20London.pdf(page 15 has the ranking of passive cooling interventions)
My plan is to order triple-glazed Veluxes with solar control glass (you can get it on special order I think) then fit external solar shutters when we can afford them.
And also actually fit proper insulation to our loft which Dream Lofts who built it didn't do lol.
We cracked and bought a portable air conditioner for the hottest days (it was 30 in our bedroom on Friday night before I turned it on) but according to that paper if we do all the right things we should be ok with passive interventions until 2080 and I'll be dead by then.
Fox
It was a double. Being an old window from 1990, the units were only 16mm thick (4mm low E / 9mm spacer /3mm toughened clear ) . It was the inner 4mm that had the film on that cracked.
https://www.abodewindowfilms.co.uk/product/light-reflective-silver-window-film
It definitely blocks a noticeable amount of light when comparing the windows with/without. However I don't think this will be an issue in practice