Thermal foil insulation, which way should the foil face?

I have just purchased Thermal foil insulation for the loft, but the instructions are not great. I have had a loft conversion, but I want to insulate the storage area in the front of the roof.I am going to use this on the beams that seperate the room and the store, but should the foil face the plasterboard, or the... show more I have just purchased Thermal foil insulation for the loft, but the instructions are not great. I have had a loft conversion, but I want to insulate the storage area in the front of the roof.I am going to use this on the beams that seperate the room and the store, but should the foil face the plasterboard, or the store area?
By the way, the insulation comes on a roll, with foil on one side and bubble wrap on the other.
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