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Should the overhang of the tile be inconsistent between rows or columns, set out roof along eaves starting with the correct over hang at the right hand verge. The overhang on the left hand verge can be corrected using the full tiles by opening or closing the side lap between the tiles. Lama ROMAN Tiles allow a total SHUNT tolerance of 2mm in side lock for adjustment.
Note: There should be a recommended shunt tolerance of 0.7mm-1.2mm Shunt clearance at the coverlock and underlock interlocking.
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Insufficient Shunt clearance (Shunt In of less than 0.7mm) will result in tile breakages at the cover locks when accidentally stepped upon.
Why Do Corners Of The Tile Break At Their Interlock Edges After Installation?
The corners of the tile, especially at their cover lock areas, are the thinnest part of the tile and as such are the most prone to damages.
If the tiles are not aligned or laid properly on the roofing tile, there is high potential for point loading that will put irregular pressure onto the corner of the tile, causing it to fracture or break.
This happens most frequently when the tiles are laid too tightly together.
If this Shunt is not maintained, damage from foot traffic or the thermal expansion and contraction of the roofing tile deck may result. Note that any debris left in the water channels during installation, creating a gap in between the interlocks could also result in point loading that may break the corners under foot traffic.
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Lama ROMAN Interlocking tiles should be laid as close to Mid Shunt (A), as possible but may be Shunted In or Shunted Out (B and C) to gain or deduct some tolerances. The tiles however, should never be Over Shunted (D) as it will lift the tiles and stress or crack at the interlocks.