A basic 3 foot wide felt paper or tar paper is traditionally
and should be included on any heated perimeter under a 7.9 / 12 pitch (building
code in southern Ontario), in other words walkable. At Gryphon Extreme Roofing
we recommend that you do this to even unheated
perimeters and have seen ice jacking
back to the roof deck during hot cold hot cold winters. So make sure your
hired roofing contractors cover your entire
perimeter.
At Gryphon Extreme Roofing we recommend upgrading to an Ice & Water Shield for your project and is definitely worth the extra (see FAQ. What
is Ice & Water shield?).