I have a very particular question:
1. We have an old 1 story stone home. Construction is load bearing 12in thick stone walls with 2X4 construction on the inside which back plaster walls and provide the route for electrical wires etc.
2. As I said, stone walls are load bearing and the hip roof joises rests on them. In otherwords, the stone runs right up to the roof.
3. At some time in the distant past, the attic space was partly converted into rooms with two dormers on either side of the collar ties. Possibly maid quarters? I don't know, but subsequent owners have completely updated the space into rather nice bedrooms. Teh downside of this is that the true unfinished attic space has been chopped up into 4 parts: A.front north, B. front south, C. Back, and D. top above the collar ties. There is no real circulation between hese parts as the living space sits between them.
4. There is a front dormer vent that sits between A and B and another one in C.
5. There are also thermostatically controlled exhaust fans in C. and D.
6. There is no soffit venting, ridge vents or such.
7. There is some fiberglass batting on the walls of the living space. But, the only other insulation is on the attic floor and consists of maybe 2in of wool. Which is completely inadequate for our climate.
So here is the problem, that even with the vents, fans and insulation, the living space which is insulated with old Fiberglass batting is basically unliveable. Too hot in the summer and too cold in the winter. The downstairs is none to warm either.
8. We'd like to change this. I had an insulation expert come in to look and what he suggested was to blow in Hot Roof insulation against the joists sealing up the two dormer vents and thermostatically controlled fans. In theory this would insulate the entire attic space from cold and heat, and thereby bringing the living space in equilibrium fromt he rest of the house.
So here is my question: I am concerned that if the attic is hermetically sealed like this the moisture in the house will have no place to go as the ground floor is defacto sealed by 12in of stone.
Any opinions on this? Anyone put a hot roof system into a stone home? Am I being overly concerned about the moisture? Anyone see any other soluition besides a hot roof?