The easiest way to tie in the new shingles with the old is with a cut valley see four ways to shingle a valley.
Room addition roof tie in.
Tying a gable roof into an existing roof is a long expensive project usually undertaken only when there is a major addition or renovation to a house.
You will need building help and a large construction dumpster for debris.
Called tying in this helps to weatherproof and strengthen the joint.
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.
Cut two rafters with a circular saw to the pitch of the addition roof and nail them across the rafters on the old roof.
Getting the right look for your addition s roof is key to integrating it into your home s exterior design.
Step 1 plan.
After the addition roof is framed and sheathed snap a line on the existing roof shingles 2 in.
Up from the valley center and cut through the shingles and underlayment.
This will seal the parts of the roof together and reduce the risk of leaking.
They form an upside down v with the point at the top of the addition roof.
The best way to tie your addition s roof in with the rest of the house is to take cues.
It is not a job for beginners.
Continue reading below our video of the day step 1 planning.
If done properly the flat roof can be tied in so that it doesn t change the look of the house at all.
You may need a structural engineer to help with design of trusses and rafters.