FIXING WITH NAILS
Slates can be supplied preholed. However, if on-site holing is undertaken, the following methods should be used
In the UK, slates are usually fixed with nails. Those nails should be either aluminium alloy or copper, silicone bronze or stainless steel in coastal areas.
Holing by hand
Wherever possible, machine holing is preferable. Holing by hand should only be considered when a small amount of slates need re-holing for repairs or when a hole needs to be repositioned in-situ
Holing by machine
If slates are machine holed it is recommended that only one slate be holed at a time. If the machine uses a punching method then attention should be paid to the risk of damage. The holing machine will need to be well maintained and adjusted regularly. For this reason a boring method is preferable.
FIXING WITH HOOKS
An alternative method of ﬁxing slates is the use of slate hooks; however, hooks should not be used below a 25º roof pitch. This method is very common in France and Belgium.