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Frequently Asked Questions

Roof Tile FAQs

  • 1. What tiles are available?

    5 profiles – Donard, Derrie Double Roman, Galloway and Causeway. (see separate factsheet for Minislate & Gemini).

  • 2. What size?

    Derrie Double Roman & Seville =419mm long x 334mm wide Galloway  , Donard = 419mm long x 330mm wide

  • 3. What colours?

    Derrie / Donard – 6 Colours, Farmhouse Red, Terracotta, Amber Mix, Brown, Black and Slate Grey.

    Seville – 4 Colours, Terracotta, Brown, Black and Slate Grey

    Galloway / Causeway – Black Smooth & Riven Textured

  • 4. What is the minimum pitch?

    Please refer to Technical Specification download on Roof Tile products page of website.

  • 5. Can they be laid lower?

    Designers and users should contact our technical sales office for advice.

  • 6. What heaplap is required?


  • 7. What batten spacing is required?


  • 8. How many tiles are needed?

    10.4 tiles per m² (our tiles cover approx. 1 sq. ft)

  • 9. What weight laid?

    Derrie – 54kg/m², Seville = 54kg/m², Donard = 55kg/m², Galloway / Causeway – 48kg/m²

  • 10. What ridge tiles are needed?

    Derrie / Seville – usually half round (18”/457mm long).

    Donard / Galloway / Causeway – universal angle (18”/457mm long).

    Decorative ridge tiles are available for all profiles.

  • 11. Have you ridges for a single pitch roof?

    Mono ridge tiles (18”/457mm long).

  • 12. What fixing is required?

    It depends on site location and exposure. Generally, tiles are nailed at 25º and above and tail clipped below 25º. On all roofs, the perimeter tiles (i.e. tiles at eaves, verges, ridges and alongside valleys and abutments) should be nailed or clipped. Along the East Coast and in the midlands, every tile in alternate courses should be nailed or clipped. Along the west and south coasts, all tiles must be nailed or clipped (see map in brochure for boundaries).

  • 13. How are clips fixed?

    Clips are fixed at the tail of the tile and nailed to the side of the batten holding the course below. Roadstone Wood supply batten clips and special clips for the verges and eaves.

  • 14. What kind and size nails are used?

    Aluminium nails available from us. Derrie – 70mm, Donard – 50mm, Seville – 75mm, Galloway/Causeway – 45mm

  • 15. What mix is used for wet bedding of verges and ridges?

    3:1 (Sand:Cement) Do not use a lime mortar. You will also need dye for the pointing, usually 6kgs (30 ridges) for a standard house. Not to exceed 5% per volume of cement.

  • 16. Ventilation

    In order to comply with building regulations, all roofs must be ventilated. We supply Eave and Ridge ventilation systems. We also supply ThruVent Tiles and Vent Ridge Tiles.

  • 17. What other dry fix fittings are available?

    Please refer to our Brochure to get full details on Dry Accessories.

  • 18. Ordering


    Dublin Contact: Jonathan, Laura, Kenneth, Andrea or Aidan at the Belgard Retail Outlet
    Tel: 01 4041275
    Fax: 01 4041360
    Email: lwilliams@roadstone.ie
    Cork Contact Richard or Pat at the Classis DIY Retail Outlet
    Tel: 021 4800118
    Fax: 021 4840743
    Email: info@roadstone.ie
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