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Understand where roof coverings start, finish and meet

Valleys, verges, ridges and eaves
explained for homeowners.

The field of tiles or natural slate is only one part of a roof. Valleys carry concentrated water, while eaves, verges and ridges complete and protect its perimeter.

— Practical homeowner guidance

Look beyond the main covering

Roof edges and changes of direction often receive greater wind or water exposure than the centre of a simple slope. Their design has to suit the covering, roof pitch, exposure and adjoining construction.

A complete re-roof quotation should say how the eaves, verges, ridge and any valleys will be finished. It should also identify connected gutters, leadwork or roofline components that are included—or specifically excluded.

Different proprietary and traditional systems can perform well when they are compatible and correctly installed. The important point is that the chosen components form one planned roof system rather than a collection of unrelated details.

— Understand the full roof system

Important details,
explained clearly.

A complete re-roof brings several materials, junctions and practical decisions together. Each section below should be read in the context of your own property and written quotation.

01

Eaves and gutter entry

The eaves support the first courses, direct underlay drainage and establish how water enters the gutter. Incorrect projection or a poorly supported edge can cause overshooting, staining or water tracking behind roofline components.

Ventilation openings and insect protection may also be positioned at the eaves as part of the wider roof design.

  • Covering projection
  • Underlay support
  • Ventilation and gutter alignment
02

Verges and wind exposure

The verge protects the exposed side edge of the covering. Mortar, dry-verge or slate-specific arrangements require compatible setting out and a secure, visually consistent finish.

Existing undercloak, bargeboards and gable masonry should be considered before deciding how the new verge will be formed.

  • Covering overhang
  • Undercloak or dry system
  • Bargeboard and masonry condition
03

Ridges and hips

Ridge and hip units weather the top and external angles of the roof. They may be mechanically fixed within a dry system or installed using an appropriate mortar-based specification.

Ventilated ridge components can form part of the airflow strategy, but they need to work with the membrane and lower-level ventilation.

  • Compatible ridge or hip units
  • Mechanical restraint
  • Ventilation where specified
04

Valleys carry more water

A valley receives runoff from two roof slopes, so width, lap, support and clear water channels matter. Debris traps, broken cuts or insufficient clearance can restrict flow.

The correct detail depends on whether the design uses lead, GRP, tiles or another approved system and how it meets the eaves and ridge.

  • Supported valley lining
  • Clear tile or slate cuts
  • Open drainage pathway

— Useful questions

Check every roof perimeter
for your quotation.

Edge details should be described in the quotation, because changing one component can affect the covering, ventilation, drainage and appearance around it.

Keep the answers with the written scope so that responsibilities, allowances and exclusions are understood before the deposit is paid.

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