Valleys
A valley carries the combined water of two roof planes, and in the Northwoods it also carries ice, pine needles and a snow load that lingers. Whichever method is used — woven, closed-cut or open metal — the membrane underneath it, the consistency of the cut line and the way the shingles are fastened away from the center determine whether it lasts. Nails driven too close to a valley center are one of the most common causes of a leak that appears three winters later.
Step Flashing and Wall Transitions
Where a roof meets a wall, each course of shingles needs its own piece of step flashing, layered like shingles themselves. Running one long piece of bent metal up the wall is faster and it works until the first real freeze-thaw. Doing it correctly also usually means removing and reinstalling siding or trim, which is one reason it gets skipped.
Pipe Boots, Vents and Chimneys
- Pipe boots are cheap and they fail on a predictable schedule; replacing them during a re-roof is standard, leaving them is a future service call
- Chimneys need counterflashing tied into the masonry, not sealant applied to the surface
- Old vent collars should be replaced rather than reset once they have been disturbed
- Bath and kitchen fans should terminate outside the roof, not into the attic — we find that more often than people expect
Fastening and the Nail Zone
Every shingle has a narrow band where nails belong. Placed high, the shingle relies on the one below it. Placed low, the nail head is exposed. Overdriven, it cuts the mat; underdriven, it holds the next course off the deck. Nail count is also warranty language — high-wind coverage typically requires more nails per shingle, and no inspection from the ground will ever reveal whether they are there.
Intake Ventilation, the Detail Most Often Left Undone
Ridge vent gets installed on almost every job because it is visible and quick. Intake at the soffit is the other half of the system, and it frequently requires crawling the attic to clear blocked baffles or opening blocked soffit. Exhaust without intake does very little, and in a cold climate an unbalanced attic is a reliable way to build an ice dam and cook a shingle from below.
Worth asking before you sign
“How will you confirm I have adequate intake ventilation, and what happens if I don't?” The answer tells you whether ventilation is being treated as a system or as a line item.
Cleanup Is a Craftsmanship Signal
Nail sweeps, tarped landscaping, protected driveways and a site left orderly at the end of each day are not cosmetic. They come from the same habits that put the right number of nails in the right band of every shingle. A crew that is careless about your yard has usually been careless somewhere less visible.
The Roof Masters standard covers these in sequence — inspection, decking, ice-and-water protection, flashing, ventilation, the roofing system, installation, property protection, cleanup and a final quality check. You can read the whole thing on our process page.
Common questions
- What are the most important details on a roof replacement?
- Valleys, step flashing at wall transitions, chimney counterflashing, pipe boot replacement, proper nail placement and balanced intake-and-exhaust ventilation. Nearly all roof leaks originate at one of these, not in the open field of shingles.
- Should pipe boots be replaced during a re-roof?
- Yes. They are inexpensive relative to the job, they fail before the shingles do, and replacing them later means disturbing a new roof.