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insulating blinds detail design

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I want to install insulating roller blinds to conserve heat, I have seen some great stuff on builditsolar but I can't work out what is the optimum combination of fabric layers and the right order to put them in.
I am doing this because it is relatively simple to DIY and makes a huge difference to overall thermal performance, cost is also a big issue- I have no interest in buying a proprietary system.

I can get:
thermal curtain lining for about £2/m it is not the kind with a radiant barrier.
Thinsulate, nominally 6mm thick, for £4.50/m
canvas/other heavy facing fabric (for aesthetics) for approx £2/m (this would face into the room, naturally)
silvered mylar film is way more expensive than I was expecting; about £5/m, haven't tried bargain-hunting for it yet though.

I don't want to attempt this:
(basically 4 layers of mylar each slotting into it's own edge-sealing track)


face-thinsulate-mylar-thermal lining ? the thermal lining has a sort of tufted surface that is meant to create a bit more of an air gap than a standard lining- that's all it does, so putting it against the mylar is logical to me. I am going to end up with a heavy fabric touching the mylar unless I use lots of thinsulate, which is expensive and probably too bulky for the roller mechanism.

I am embarrased to say that I took physics in school but I don't know how to begin working this out.
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