Guide
Where asphalt shingles must stop on porches, additions, and low-slope roofs
Written by Ultra Power Construction. The credentials page states that this contractor is licensed and insured in New Jersey and lists GAF and Owens Corning programs. Updated 2026-09-28.
Morristown, Cranford, and South Orange houses often attach a low-slope porch or addition to a steeper main roof. Asphalt shingles have a pitch limit. The decision on the estimate is where shingles stop and where a low-slope membrane or different system begins.
- Pitch limits are not optional styling
- The transition is a detail, not an afterthought
- What to require before you sign
Pitch limits are not optional styling
Architectural shingles need enough slope to drain. Below the manufacturer minimum, water sits in the laps. A porch that looks like a shingle roof may need a membrane instead.
The transition is a detail, not an afterthought
Where the main roof meets a low-slope porch, the estimate should name the transition metal, membrane, and how water leaves the joint. Painting shingles onto a flat porch is not a detail.
What to require before you sign
Ask which planes stay asphalt and which become membrane. A Cranford or Morristown bid that prices “whole house asphalt” without checking porch pitch is incomplete.