Here is a cross section detail of the cold roof system referred to in the previous post is going to lay out. The intent of this kind of roof is to keep all the heat in your house from escaping through your roof. The interior of Beagle Brook will be left open to the ridge so the rafters are the defense from heat passing through. We framed with 2x10 roof rafters at 24" o.c. (for more cavity space and less wood) whose cavities will be filled with open cell spray foam yielding a plus 30 R value. There is 3/4" plywood sheeting attached to the rafters for structural support and building continuity. We will then form our drainage plane, take care of all the thermal breaks from our rafters and add more insulation with 2" rigid foam taped and sealed at the seams. On top of the rigid foam we will place flat lying 2x4's perpendicular to the rafters to form an air gap that will be vented from our under soffit vents to the ridge vent. Another layer of 1/2" plywood sheeting will be installed as well as the building felt, ice and water shield and the metal roof system. This will provide a roof that will keep the heat in during the winter cold months and the cold out and during the hot summer months keep the cool air in and the hot solar radiation out.