Building roof over deck for enclosed sunroom. Existing roof is a shed type roof and we want to connect to the existing roof rather than to the side of the house because of slope.

To continue the existing roof, u will have to remove the lower part of existing roof to expose the top plate of exterior wall. This will give u the seat u need for new rafters and a smooth transition from old to new. The size of new rafters will be determined by span from inside wall to outside wall of deck.

To keep the new ceiling level the height of inside wall and outside wall must be the same.

To give u a 4'' pitch, cut a wedge from 2'' to zero out of rafter and reverse it. Nail the wedge on top of rafter. If using a 2x12 for rafter this will give u 9 1/2'' at outside wall and 13 1/2'' at inside wall.

If u need the strength of a full 2 x12 then rip a 2x4 to make the wedge. This will give u a 3 1/2'' pitch.

Chuck