The past two years that I've done this, I noted how the acrylic (or in some cases, thin poly plastic) was always billowing inwards. I assumed this was because the woodstove was pulling outside air in to heat and send up the stovepipe.
|This problem pane constantly pulls away from the frame, luckily the clothes dryer rope holds it in place.|
I mostly feel it has been on cold days with a wind that must just hit things the right way while the fire is running low.
Twice though it's been suggested that another possibility is that there is an alternate chimney effect in the cabin due to air leaking out upstairs and coming in on the main floor.
I was pretty sure not much was escaping through the attic, as it was spray foamed for the most part, and when I examine it from outside, I can see no places where snow is melting faster than any other locations.
I hadn't (and don't intend to) install an acrylic storm on Kenny's bedroom window. In case of an emergency, I didn't want him to have to try to quickly remove a hard, large sheet of plastic before opening his window and exiting out onto the porch roof. So far this winter, I hadn't done anything with his window.
Finally I put on some thin poly that would be easily torn, and was immediately struck by how it was pushed OUT - against the window itself! Here was a clear chimney effect going on in the cabin. I wonder how much air has been escaping from his room all this year?
|It's hard to see, but the poly is being pressed against the glass here.|
I remembered that I had an extra piece of acrylic sized to the pantry and bathroom, so I braved the extreme cold and taped it up outside the bathroom, which made an immediate difference to the amount of frost that was building up inside that window.
|I think it doesn't look half bad!|
|Still a bit of frost in the corners at thirty below.|
|A bit of staining from frosty condensation melting. :(|
|The pantry gets frost between the storm and the glass - mustn't be a very good seal.|
|And loads more frost on the mounting tape itself too!|
As for the large window constantly pulling away from the frame? After using them to help create the portable indoor shower, I realized that spring loaded shower curtain rods could have multiple uses around the home or homestead, and in this case, installing one in the frame to run vertically and hold the acrylic in place was just the ticket. Even leading Donna to the window and telling her I had "fixed" that problem failed to get her to immediately notice it - the two whites blended in so well.