A chine is the sharp or rounded transition between two planes of a structure that meet at an angle. In construction, the term is most commonly found in roofing (the transition from roof plane to gable), in concrete structures (the angle between floor and wall) and in shipbuilding (the transition from bottom to side).
Types of chines in construction
| Type | Description |
|---|---|
| Roof chine | The lower edge of a roof plane, where the roof meets the gutter line |
| Concrete chine | The angle between a concrete floor and concrete wall |
| Foundation chine | The transition from foundation slab to rising wall |
| Sharp chine | A sharp angle without rounding |
Hip rafter
The hip rafter is the diagonal timber at the corner of a hipped roof, where two roof planes meet at an angle. This is a structurally important member that carries the jack rafters of both planes.
Points of attention for chines
- Watertightness: the chine between floor and wall is a vulnerable point for moisture penetration
- Chine strip: a waterproof strip or profile applied in the chine
- Rounding: in render or coating work, the chine is often rounded for better adhesion
- Movement joint: in large structures, an expansion joint in the chine may be necessary
Tips for the DIYer
- In basements, always apply a chine strip at the transition from floor to wall
- Round off chines before applying a coating or liquid waterproofing
- In roofing work: check the chine for cracks or loose lead flashings
- Use a chine sealant at the transition from a flat roof to an upstand
Related terms
- Hip rafter: diagonal corner timber of a hipped roof
- Chine strip: waterproof strip at the floor-wall junction
- Valley gutter: gutter in the internal angle between two roof planes
- Rafter: diagonal timber in a roof structure