OT: Roof framing, alteration Options

[thomasotten]

I have an existing roof on my house that is pitched and creates a cathedral type ceiling underneath. I am considering increasing the pitch of this roof, for ascthetic reasons mostly, but also to add insulation to the roof, which I don't thick is adequetly insulated. There is no attic space right now, so I cant' be sure of the insulation, although it gets hot in summer time. I want the final roof to be 12/12, and to do this, I would need to raise the ridge by about 2'. From the ridge, I would then run rafters down to the bottom of the roof fascia. Instead of raising each rafter up and causing a mess, I am considering building a structure over the exsiting roof, and then sheathing over. That way I don't disturb the ceiling. I was thinking of also doing this in phases, keeping the existing shingles on as a I go. What do you think?

[thomasotten]

This is my plan, by the way, notice that also, with this pitch change, I can also join the porch gable with the main gable. The jackasses that built the house left a 2' gap between the two gables, so that the porch always gets wet!

(IMG:http://www.uber-werks.com/images/house/1.jpg)

(IMG:http://www.uber-werks.com/images/house/3.jpg)


I have been looking into this radiant barrier also, as a way of getting better insulation.

http://www.insulation4less.com/prodex_Ffmf.asp

I have also seen these sheathing boards with radiant foil already on them. They are relatively inexpensive, when compared to plywood. I wonder if it would be better to use the prodex insulation, or the sheathing with pre-attached foil? Anyone?

http://www.solarboardosb.com/