I'm going to be putting up a ceiling on my back porch, which is glassed in. The heat can be unbearable, so I thought I'd investigate insulation. I keep coming up with recommendations for metallic/reflective radiant barriers. They seem logical, I have an air gap between the joists, and the weight isn't going to strain my porch. (Probably nothing is, but at my house, something always goes wrong.)
The porch roof is just over the bottom of the roof joists, which simply has insulation stuff in the open attic to block cold. If the roof is enclosed, I could leave that open for heat to rise, but it would be up into the attic and out the ridge vents.
Any pros or cons? Am I off base?