Random Roofing – How to Install Diminishing Courses

One of the many advantages of using natural roofing slate is that you can achieve unique aesthetics like random effects.

So what are the random roofing effects you can design, and how do you get the desired result?

Download the complete random roofing and diminishing courses brochure.

Random Effects

A traditional and increasingly popular slate specification is “random roofing” (also known as “diminishing courses”). This finish gives your roof a cost-effective way of either reproducing traditional random slating during a restoration project or creating a stunning aesthetic or visual effect on a brand new building.

There are three random slating patterns:

  1. Random – using roofing slates of different lengths and widths
  2. Random Width – using roofing slates of the same length but in random widths
  3. Random Width in Diminishing Courses – using roofing slates of random width in courses of progressively shorter length (towards the roof’s ridge)

Size and coverage

To achieve random slating effects, pallets of SSQ Riverstone Random roofing slate are supplied in two ways:

  • Mixed – a mixture of random lengths and widths
  • Random Width – all roofing slates are the same length but are of random width

Each pallet contains, as appropriate, a variety of lengths and widths

  • Length – ranges from 300mm to 600mm in 50mm increments
  • Width – ranges from 150mm to 450mm in 25mm increments (but most are between 200mm and 300mm)

Riverstone Random roofing slate can cover between 22m² and 24m² per tonne using an overlap of 75mm to 100mm.

A Diminishing Course effect – roofing slates of the same width but in courses of progressively shorter length – is achieved by ordering slates of the same width but in the various lengths required.

For more product information, including details about headlaps and E factors, download the brochure now.

Need Help?

If you’d like advice about random roofing slates, or any other ‘special effect’, our technical experts are here to help you.

Contact our specialist experts today and they’ll get back to you immediately – click here to contact the experts.