Roofing
Flat andlow-slope roofingwhere shingles cannot go.
A shingle roof below its minimum pitch is a leak with a warranty attached. Below that angle the covering has to be a membrane.
In detail
Flat & low-slope roofing
Every shingle has a minimum pitch in its installation instructions, and below it water moves slowly enough to find its way under the lap. Porch roofs, dormer tops, rear extensions and anything built flat by design need a continuous membrane instead — TPO or EPDM in single ply, or modified bitumen in torch or self-adhered sheets. We specify from the detail rather than from habit: a small porch roof butting into a wall wants a different answer from a large flat deck with drains in it.
What actually decides the life of a flat roof is the edges and the falls. Water has to be moving somewhere — a dead flat roof holding standing water will find any weakness eventually — so we build in fall where the structure allows and taper insulation where it does not. Terminations at parapets and walls are mechanically fixed and counter-flashed rather than stuck down and hoped for, and the tie-in where the membrane meets the sloped roof above it gets the most attention of anything on the job.
What this covers
- TPO, EPDM or modified bitumen, specified from the detail
- Fall built in, or tapered insulation where structure prevents it
- Mechanically fixed terminations and counter-flashing at walls
- Detailed tie-in where the membrane meets the sloped roof above
- Part of
- Roofing
- Typical timeline
- 1–3 weeks
- Where
- All 21 New Jersey counties
Questions
Asked most aboutflat & low-slope roofing
What is the minimum pitch for a shingle roof?
Manufacturers set it, and it is typically around a 2:12 slope with additional underlayment requirements below 4:12. Under that threshold water moves too slowly to clear the laps reliably. If you have shingles on something flatter than that, the roof is working against its own instructions and we will tell you so.
How long does a flat roof last?
A well-installed single-ply membrane gives twenty years or more, and the failures almost never happen in the field — they happen at terminations, around penetrations and wherever the detail got complicated. That is why the perimeter and the tie-ins get the attention and why we would rather quote those honestly than quote a square-foot rate.
The rest of the scope
Everything else inroofing
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