Hi Joe
No probs just keep asking away. I used thick black plastic doubled over, it is used for under concrete slabs. Another item to use is aluminium coated paper or insulation foil used in houses under a metal roof or around the wall before they apply the outer skin of the house, this is quite thick foil paper.
Now what I would do is use a good quality aluminium tape (3M) and go around all the windows first paying very close attention to getting it up against the skin surrounding the window. Then apply the cover you decide to use and tape that over the window recovering the initial foil tape. I ended up covering the windows twice over as I didn't want to take the chance, and I spent a lot of time getting the edges right.
Up to you which one you use, which ever it is I would strongly recomend a double up.
Hope this helps
Dave
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