Do I need to remove shingles on a valley end of a gable roof?

Question

Hi,
I am building my new garage. It has a gable roof with a valley attaching to the existing roof. My question is when I frame the valley, and add the support for the rafters onto the main roof. Can I just place the support wood onto the roof without removing the shingles? Or should I remove them?

Thanks for your time.

pb4sc

Answer 1

I would remove them, otherwise,the old shingles will deteriorate with time, and allow play between the new,and old construction.Also.the asphalt in the old shingles could start to run in the new airless setting.Remember,this will be attic space,essentially,and temperatures will be much hotter than the outside of a roof.

Answer 2

It's pretty much your choice. It certainly wouldn't hurt to remove them, especially if there's two layers. But it shouldn't cause a problem if you simply put the new supports right over them. Just be sure to screw them down, nails notorious loosen with the years, and could allow movement down the road, which could translate into a leak.