We just put a new "skin" of T1-11 around an old pole barn on our property. It used to have old broken glass windows from some salvage or another and now it's completely dark inside.
I looked at all kinds of windows and found that storms are the cheapest and lightest-weight solution. I'm wondering if the T1-11 is strong enough to support a smallish (24 x 39) storm window without additional framing. It gets really windy out here. I would put a decorative frame of 1 x 4s around the outside. Home Depot has storms of just about any size for $30 and the holes are pre-drilled.
I want to keep this simple and low-cost because the barn is pretty rough and we are building a new garage. We will probably never have electricity out there, although I may hang a 4' florescent utility light and run an extension cord when I really need it.
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