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What quantity of batten do I need when using Hardrow slates?

What quantity of batten do I need when using Hardrow slates?

The quantity of batten required will depend on the slate size and the gauge at which they are laid. The table below outlines the quantity required:

 Slate Size (mm/in)  Pitch  Gauge (mm) Batten (lin mtr/m²) 
 381 x 229   15 x 9  30º and above 150   6.7
 457 x 305   18 x 12  25º and above 191  5.23
 457 x 457   18 x 18  20º - 24.5º 178   5.62
   25º and above 191  5.23
 610 x 457   24 x 18  17.5º - 19.5º 241   4.15
   20º - 24.5º 255   3.92
   25º and above 267   3.75