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If you wonder what size of sheet you need for your tunnel this table will guide you.

1. Select the column (top rows) which shows the width of your tunnel.
2. Select the fixing method. (Next 3 rows.) That shows you the width of sheet you will need.
3. Follow that column down until you get to the row (left hand columns) that corresponds with the length of your tunnel.
4. That gives you a guide as to the width and length of sheet you will need.

  1. This fits 99.9% of all commercially manufactured tunnels. However there are always exceptions and XL take no responsibility for a sheet incorrrectly ordered.
  2. So to be belt and braces sure measure over the top of the hoop from fixing to fixing to give you the width of sheet and then add 1 length of your tunnel to 1 width (at ground level) of your tunnel to give you the length of sheet you need.
  3. You need to allow approximately 1 metre each side of your sheet if your fixing method is ground buried in a trench.