Shingles that curl, cup or lift at the corners no longer sit flat on the roof. This curling, common on aging roofs, changes the way water and wind interact with the surface.
Common causes
aging and drying out of the asphalt, overheating of the attic from insufficient ventilation (which cooks the shingles from below), problematic installation (inadequate nailing, double layer, misaligned shingles), or moisture trapped under the shingle.
Signs to watch for
lifted or wavy corners, cupped or brittle shingles, associated granule loss, shingles that flap in the wind, an abnormally hot and poorly ventilated attic, an irregular alignment of the covering.
Why you should not ignore it
a shingle that is no longer flat gives the wind a grip (risk of tearing off) and lets water infiltrate more easily under the covering, especially in wind-driven rain. Curling is one of the classic markers of a roof entering its end-of-life phase, often tied to a ventilation problem to diagnose.
What a professional assessment reveals
Shingles that curl have lost their adhesion and let wind and water in. An assessment gauges whether it is a few shingles or a covering at the end of its life, and the urgency of acting, a common finding from a pre-purchase inspection.
Curled shingles foreshadow infiltration. On a building, Boreon takes them into account in its roof expertise, along with the condition of the flashings.
Vous soupconnez ce probleme dans un batiment ?
Une inspection le confirme, le documente et le chiffre, pour decider en connaissance de cause.
Inspection preachat Bilan de sante du batiment (BCA) Demander une soumission
