Ridge Cap Shingle Guide

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Ridge and Hip Caps Are Not Field Shingles

Field asphalt shingles are sold and estimated by the square — 100 square feet of roof surface. That is what the roofing square & shingle bundle calculator covers.

Ridge and hip caps are a different SKU. Manufacturers sell purpose-made hip-and-ridge (ridge cap) products by the bundle, with coverage printed in linear feet at a stated exposure. You measure the ridge runs and hip runs, convert to feet with waste, then divide by that printed coverage. Mixing the two takeoffs is how crews run short of caps on day three with a full pallet of field bundles still on the truck.

The same product usually covers both ridges and hips. A simple gable has ridge only. A hip roof adds four (or more) hip runs that need the same cap material along the angled edges.

The Linear-Footage-to-Bundles Method

1. Measure every ridge run that gets caps (main ridge plus any secondary ridges).
2. Measure every hip run that gets the same product. Enter 0 hips for a pure gable.
3. Read the coverage per bundle on the wrapper you will buy (default planning number: 25 ft).
4. Add waste (5% is a common starting point; more on complex hips and cut-heavy jobs).
5. Divide and always round up to the next full bundle.

Run the same numbers in the calculator to confirm. Yards do not sell 0.36 of a hip-and-ridge bundle.

Why Coverage Varies — GAF Published Specs

Coverage is exposure-driven. Shorter exposure means more pieces (and more linear feet) from the same piece count; longer exposure covers more per piece but fewer total feet per bundle.

• GAF Seal-A-Ridge: GAF publishes roughly 25 linear feet per bundle based on 45 pieces at a 6⅔ inch exposure. That is the most common planning default on TestTalkHQ and in many yards.
• GAF TimberTex and similar wider-profile hip-and-ridge products use a longer exposure (TimberTex is commonly cited at an 8 inch exposure). Wider exposure = fewer linear feet per bundle than Seal-A-Ridge. Do not assume 25 ft if the wrapper says otherwise.

Industry-wide, hip-and-ridge bundles generally land somewhere around 20–33 linear feet per bundle depending on brand and exposure. The calculator’s coverage field is editable so any brand works — the default of 25 is a Seal-A-Ridge starting point, not a law of physics.

Applying the Result on the Job

Manufacturer instructions win over generic advice. In broad practice for asphalt hip-and-ridge:

• Install a starter piece at the beginning of each ridge or hip run (often a cut piece or a designated starter per the instructions).
• Work from the ends toward the center on many ridge details so the final piece can be cut and seated cleanly — or follow the sequence your manufacturer prints if it differs.
• On hips, start at the eave and work toward the ridge peak unless the instructions say otherwise.
• Fasten per the listed nail count and placement. Cap blow-off is usually under-fastening or wrong nail length, not “bad bundles.” Field nail counts live in the roofing nail calculator; caps still need their own pattern.
• If a continuous ridge vent sits under the caps, the vent length still follows the ridge — size attic NFA separately with the attic ventilation calculator.

FAQ