The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
How to tie roof lines together.
Then it was just a matter of marking and cutting the miter for one side and flipping the cut off scrap over and cutting it to length for the other side.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
That s a simple low cost solution that can tie in well with the main house.
Position the flashing between the two roof pitches.
Tie a new gable or hip roof to an existing gable or hip roof with valley rafters which perform the same function as ledgers.
Because the level cut on the jacks would be so long we added 2x4 sleepers inside the 2x8s for a more complete bearing.
Slide the right edge of the flashing under the highest roof pitch.
We extended the lines of the sleepers up the roof until they intersected.
For example the surgeon s knot is one of the strongest and best for tying together any two lines when time is of the essence.
Strip the roofing from the old roof at the connection point to.
Up from the valley center and cut through the shingles and underlayment.
If you re adding to the gable end of the house the side wall that goes up to the roof s peak it s fairly easy to extend the existing roofline over the new space says curt schultz a realtor architect builder in pasadena calif.