Gemini Roof Tile | Double Size Roof Tile Supplier Ireland

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slate

Appearance of two plain tiles

Gemini

Gemini TwinTile is an interlocking tile which is 270mm x 330mm overall. With its carefully judged central groove, the tile gives the appearance of two plain tiles side by side when laid. With a laid weight of just 50kg per metre square it is equally as cost effective for refurbishment as for a new build.

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Gemini

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Colours Available

Brown
Farmhouse Red
Slate Grey

Sizes Available

270 x 337mm
Tile & 1/2 - 270 x 495mm

Description

Roof Tiles are manufactured to exacting standards in compliance with I.S. E.N. 490: 2005 Concrete Roofing Tiles & Fittings and should be fixed in accordance with the Irish Code of Practice for Slating and Tiling S.R. 82.

Fixing Guide: Recommended Nailing/Clipping as per requirements given in compliance with S.R. 82. The minimum recommended pitch may be influenced by certain restrictions. For advice on pitches between 22.5º and 17.5º please contact your local Roadstone location, which can be found here.

(Over 55º subject to increased fixing)

LEARN - Roadstone online seminars

Roof tiles & roofing systems

Learn about relevant specification for Slating and Tiling in Ireland, along with important design considerations and solutions for various roof pitches.

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Technical specification

Resources

Roof tiles brochure Download PDF

Roof tiles SDS Download PDF

Product sizes

Size (overall)	Minimum Pitch	Maximum Pitch	Covering capacity (nett) at	Bale Size	Qty per strap
Standard Tile 270 x 337mm	25°	90°	190mm gauge: 16.6 slates/m²	336	7
Three Quarter 270 x 260mm		(Over 55º subject to increased fixing)	175mm gauge: 18.1 slates/m²
Tile and a half 270 x 495mm

Wind speed zones

Fixing guide

Windloading

Under strong wind gusts the uplift of the roof tiles may be in excess of the dead mass of the tiles, hence requiring them to be securely fixed to prevent them being lifted from the building.

Wind loadings/tile fixing

The principal factors to be considered in deciding on the necessity for additional mechanical fixings are:

- The exposure and location of the site
- Type of element
- The height of the building
- The roof pitch
- The higher wind loadings encountered at eaves and verges

Where a building is complex in shape, located on steep sloping ground or near to the edge of a cliff, further advice should be obtained.

Recommended nailing/clipping

Recommended nailing/clipping as per requirements given in compliance with SR. 82.

- In the green area of the map every tile should be nailed or mechanically fixed.
- In the blue area each tile in every alternative course should be nailed or mechanically fixed.
- On all sites, every edge or perimeter tile should be nailed or mechanically fixed. In the case of valleys, the first full tile should be nailed or mechanically fixed.
- On exposed sites and in built up areas subject to adverse wind effects such as funnelling, every tile should be nailed or mechanically fixed within the blue area.
- On all roofs at pitches above 45°, each tile should be nailed or mechanically fixed.
- On all roofs at pitches of 55° and over, in addition to nailing each tile, the tail of each tile should be mechanically fixed.

Exposed buildings

For the purposes of selecting appropriate mechanical fixing, buildings in the following circumstances are considered to be exposed:

(a) any building which stands above its surroundings or has a ridge height in excess of 12 metres above adjoining ground level, or

(b) any building on a hill slope or hill top, or

(c) any building in a built up area which is subject to adverse wind effects, such as funnelling, or

(d) any building which is located in the green area of the map.

Severely exposed buildings

For the purposes of selecting appropriate mechanical fixing, buildings located in the green area of map which are in the following circumstances, are considered to be severely exposed:

(a) any building which stands above its surroundings or has a ridge height in excess of 12 metres above adjoining ground level, or

(b) any building on a hill slope or hill top, or

(c) any building which is subject to adverse wind effects, such as funnelling.

In summary, minimum fixing requirements for single lap tiles.

Tile profile nail size

Pitch fixing requirements
Pitch ≥ 55° - All exposure conditions: every tile head nailed and tail clipped
Pitch > 45° - a) Normal building: every tile head nailed or tail clipped
and < 55° - b) Exposed or severely exposed building: every tile head nailed and tail clipped
Pitch ≤ 45° - a) Perimeter* area, normal building: every tile head nailed or tail clipped
b) Roof area excluding perimeter*, normal building : each tile in every alternative course head nailed or tail clipped
c) Exposed building: every tile head nailed or tail clipped
d) Severely exposed building: every tile head nailed and tail clipped

*All bedded ridge tiles should be mechanically fixed.

All tiles at eaves, verges, ridges, hips and tiles adjacent to valleys, abutments, chimneys, rooflights, etc.

Roof tile accessories installation guide

We've created these handy demonstration videos to help you when using and installing our products.
We'll be adding to our video tutorial library on a regular basis, so don't forget to check in with us to see what's new.

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Gemini

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