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Metal roof flashings: ridge, verge, wall flashing and fillers

Posted on: 09/22/2026
Sheet metal guide 2026
Metal roof flashings
ridge, verge, wall flashing
22 September 2026
By SuissePliage
Reading time 7 min

A metal roof is only watertight if its edges are. At the top, along the sides, against a wall or along a hip: every line has its own folded part. This guide explains what each flashing does, where it goes and how to work out what to order.

✅
The short answer

The ridge covers the top of the roof, the profile filler closes the ribs under the ridge, the verge protects the side edges, the wall flashing joins the roof to a wall and the hip covers the sloping lines between two roof slopes. All come in 2 m lengths.

Diagram of metal roof flashings: ridge, profile filler, verge, wall ridge flashing and fascia

1 double ridge · 2 profile filler · 3 verge · 4 ridge flashing against the wall · 5 fascia.

At the top: ridges

Part Where Purpose
Double ridge Top of a dual-pitch roof Covers the joint between both slopes (no. 1)
Mono-pitch ridge Top of a single-slope roof Protects and finishes the high point
Wall ridge flashing Top of a lean-to roof against a wall Ridge with an upstand against the wall (no. 4)
Half ridge with notched bead High edge, asymmetric junction Neatly closes the top of a slope

Under the ridge, the notched profile filler (no. 2) follows the shape of the ribs: it stops driving rain, powder snow and birds while letting air circulate.

Along the edges: verges and fascias

3

Verge

Closes the side edge of the roof at the gable and protects it from rain, wind and snow. See the verge

Verge wall flashing

When a roof edge runs along a wall, it turns up against the wall for a watertight junction. See the wall flashing

5

Fascia

Covers an edge, a verge, a parapet or a facade with a flat, straight face. See the fascia

Sloping lines: hips

On a hipped or multi-slope roof, the hip covers the sloping line where two slopes meet. The double hip covers both sides; the half hip is used for partial junctions and corner finishes.

Small parts that make the difference

  • The end cap closes off the end of a flashing, verge or wall flashing at the side.
  • Joint straps connect two lengths of profile for a clean, watertight joint.
  • For the finish under a window, see our guide to the window sill.

Working out and ordering

1

Measure each line

Length of the ridge, each verge, each wall flashing and each hip, in metres.

2

Allow for the laps

2 m parts lap by about 10 cm. So count 1.90 m of useful length per part: a 9 m ridge needs 9 ÷ 1.9 = 4.7, so 5 ridge pieces.

3

Use the same material

Stay with the same metal family as the roof covering to avoid galvanic corrosion. Colours are available in RAL aluminium and zinc finishes (metal characteristics).

4

Made to measure if needed

If the shape or size of your roof is non-standard, draw the part in the configurator: free dimensions and instant price.

Laying a steel sheet roof? Our guide to steel roofing sheets covers profile choice, pitch and installation.

All roof flashings

Ridges, verges, wall flashings, fillers and hips in 2 m.

▶ See the flashings

→ Draw a made-to-measure part in the configurator

Frequently asked questions

Q
What is the difference between a ridge and a profile filler?

The ridge is the part that covers the top of the roof. The profile filler sits beneath it: it follows the ribs of the sheet to close the gaps between the roof covering and the ridge.

Q
What is the difference between a verge and a verge wall flashing?

A verge finishes a free roof edge at the gable. A verge wall flashing is used when the roof edge runs along a wall: it turns up against the wall for a watertight junction.

Q
Double or mono-pitch ridge: which one?

A double ridge covers the top of a dual-pitch roof. A mono-pitch ridge finishes the top of a single-slope roof. If that top edge is against a wall, choose a wall ridge flashing.

Q
How many ridge pieces do I need?

Count 1.90 m of useful length per 2 m part, because of the lap of about 10 cm. A 9 m ridge needs 5 pieces.

Q
What material for the flashings of a steel sheet roof?

The same metal family as the roof covering, to avoid galvanic corrosion. For a matching colour, choose RAL aluminium or a zinc finish.

Q
Can I order a made-to-measure flashing?

Yes. If the standard sizes do not fit, the configurator lets you draw the part with your dimensions and get the price instantly.

ridge flashing profile filler verge flashing wall flashing hip flashing fascia metal roof flashings
Posted in: Guides & Tips

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