There are various types of radiant barriers (outside of a ReflecTix or AlumaShield type OSB that has a super thin layer of tin foil like product on it; this is used for your decking).
If someone wanted to maximum insuation, it would go like this:
–OSB with ReflecTech / Reflectix / SolarBond type film on it (note: alum. film goes DOWN, or to the attic side, NOT up).
- *Optional: Ventilated OSB decking with solar filmed underside & vented spacer strips to allow air circulation.
–Radiosity type product sprayed on the UNDERSIDE of the OSB or decking.
–Foamular sheets tacked from underneath to the OSB or decking.
–Insulation batts stapled in between the trusses to the underside of the decking (R 19 @ a minimum).
–A layer of a bubble packing type product that has an aluminum foil facing on both sides of the product.
& That would be a “balls to the wall” type installation, IMO. Very time consuming but very (VERY) energy efficient.
I’m in the middle of a 12x12 shed w/ 6:12 pitch (it’s for saddle gear & feed; will be air conditioned) & the deck is a SolarBond / ReflecTix type OSB, Atlas Summit in place of felt, foamular sheets over the vapor barrier, then horizontally laid 1x4 purlins with a snap lock / hidden screw metal panel laid over the top of this. I’m currently doing the walls & the roof panels are ‘soon to come’.
On the underside of the deck, I’m going to staple in a layer of the reflective bubble wrap stuff, then some R 19, another layer of the bubble wrap & finish off the underside with some 4x8 sheets of plywood. The ceiling will be vaulted… a smaller window A/C will go under the peak; that way I can keep it out of the horses reach.
I’ll post photos whenever I get it finished.
Note: the reason for the horizontal 1x4’s vs. going directly to the wall board is so there is some air ventilation behind there; it will allow for a bit of heat dissipation. The panels (roof & wall) are .26 galvanized, mill finish, & the walls are wrapped with a Tyvek type product.