What Is Shingle Nailing and High-Nailing?
Every shingle carries a manufacturer-marked nailing zone, usually a narrow band just below the seal line. A nail placed there passes through the shingle being installed AND the top edge of the course below, so each fastener pins two shingles — the geometry the wind ratings assume. High-nailing, driving nails above that band to speed the work, catches only one layer: the course below is then held by nothing but its seal strip, and the roof's wind resistance quietly halves. Overdriven nails from an over-pressured gun cut through the mat; underdriven or angled nails tent the shingle above. Four nails per shingle is standard; six is required for steep slopes and high-wind ratings. None of this is visible on a finished roof — the defect surfaces years later as blow-offs in moderate wind, whole tabs sliding, or zipper-pattern failures. Diagnosis means lifting tabs and looking; the only true fix for systemic mis-nailing is replacement, which is why blow-offs in ordinary wind on a young roof warrant an installation-quality inspection.
Important Distinction
Note: High-nailing is invisible from above on a finished roof — it is diagnosed by lifting tabs or found after blow-offs, which is why a roof can look perfect and still be uninstallable-grade defective underneath.
Also Known As
These are the search terms and phrases that commonly refer to this topic, so you can find it however you describe it.
How Shingle Nailing and High-Nailing Relates to Other Topics
High-nailing - nails driven above the marked nail line - misses the top edge of the shingle below, so every shingle is held by half its intended fasteners; the roof looks perfect until the first strong wind finds it.
The nail line on a shingle marks where one nail catches two shingles at once - the course being laid and the top of the course below - which is how four nails per shingle hold with the strength of eight.
Manufacturer wind warranties assume the printed nailing pattern was followed; a high-nailed or under-nailed roof can fail in rated winds and leave the owner arguing installation with a manufacturer who warranted only the shingle.
Related To Shingle Nailing and High-Nailing
A nail is only as good as the wood it grips: nails driven into rotten or delaminated decking back out over time, and each backed-out nail lifts the shingle above it into the wind.
Questions about Shingle Nailing and High-Nailing?
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