What Is Ridge Cap Shingles?
Ridge caps are individual shingles bent over the ridge and hip lines, lapped away from prevailing weather, each nail covered by the next cap. They close the joint where two planes meet at the top — and where a ridge vent's slot must stay covered but breathing. Their position punishes them: wind speeds up as it crosses a ridge, hail strikes the fold nearly perpendicular on both faces, and the bend itself pre-stresses the asphalt. Caps therefore crack, lose granules, and blow off before field shingles do, and hail inspections check them first because bruises on caps often confirm a storm's severity. Failure modes include cracking along the fold (guaranteed when field laminate shingles were bent into service as caps), exposed nails at the final cap, and displaced caps over a ridge vent. Homeowners can see missing or lifted caps from the ground. Replacement of caps alone is a legitimate, contained repair when the field is sound.
Important Distinction
Note: Purpose-made hip-and-ridge caps are thicker and pre-bent; caps cut from field three-tab shingles crack along the fold, especially on laminated-shingle roofs where the field product cannot bend. Damaged caps alone do not equal a totaled roof — but they age fastest.
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 Ridge Cap Shingles Relates to Other Topics
Ridge caps over a ridge vent must be nailed with longer fasteners because the vent adds thickness under them; short-nailed caps are why a vented ridge sheds its caps in the first serious wind.
Ridge caps are bent over the peak, pre-stressed at the fold, and sit in the most exposed wind position on the roof - which is why the ridge line is usually the first place a windstorm collects its toll.
Cut-up 3-tab pieces used as ridge caps on an architectural roof are the tell of a budget job: laminated lines have matching heavier cap shingles, and the thin substitutes fail first at the fold they were never designed to make.
Questions about Ridge Cap Shingles?
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