If I insulate the roof.......

[aldarita]

Silver side facing the roof. The reflective side faces side you want to repel the heat.

Funny thing, I live in South Texas and everybody, including the contractors say that for the radiant barrier OSB when you are building a roof, you put the shiny side down and if you are building a wall, the shiny side goes out. We built a barn and 2 coops with the OSB on the roofs with the shiny side down as they told us and it is impressive the difference in temperatures from outside to inside

 

[Fred's Hens]

Consult the manufacturer fact sheet website. GP, Weyerhauser and others likely answer these questions on up or down. Maybe the lumber yard or Big Box Home Center also has an installation fact sheet available as well.

 

[3chicksmomma]

I'll do some research before installing it. I have seen some photos of chicken coops with the shiny side down.

 

[Egghead_Jr]

Funny thing, I live in South Texas and everybody, including the contractors say that for the radiant barrier OSB when you are building a roof, you put the shiny side down and if you are building a wall, the shiny side goes out. We built a barn and 2 coops with the OSB on the roofs with the shiny side down as they told us and it is impressive the difference in temperatures from outside to inside

It's about which side you want the heat to reflect off from. With a house you want it to reflect back into it if your heating the house. With homes or coop roof in hot climate you want it to reflect back out the roof a.s.a.p.

The foil is a radiant heat barrier or "reflector" so side that has the heat you want repelled is side of foil facing.

 

[4 the Birds]

The foil side should face your air space. So if your foil backed rigid insulation is exposed for the roof then you will see a foil ceiling (if you had an attic then you would see the foil side in the attic). You can sandwich your roof insulation for a more R value and fire safety. If you add it in the walls then either way and then sandwich it between an exterior and interior board. My tractor barn has exposed interior insulation on the walls and ceiling and it was installed by the barn contractor and it meets local building codes (the batt insulation is wrapped in a material that is fire retardant rated).
Install it either way... the foil is not a huge R value factor. More of an aesthetics thing.

 

[blucoondawg]

You should also consider your roofing material, if you use black shingles your coop is going to get hotter than if you use a light gray or white shingle color or a white tin or some other light colored material.