Help with baton layout

[onecog]

Hi folks!
I intend to put a new roof on this small extension as all the timbers are shot.The existing slates are 450mm and my new ones are 500 so was wondering if someone could help me with the baton spacing.the roof is 2.1m from fascia to ridge.Does it depend on where the nail holes in the slates are ?
thanks

Untitled

• onecog
• 3 Mar 2013
• 2

 

[noseall]

Length of slate less head-lap divided by two = spacing.

...Or a bit less if the length of the rafter dictates rather than closing down the last few courses.

 

[datarebal]

once you know your gauge dont need to adjust slate gauges, keep them all the same somewhere between 200 mm and 212 mm depending on roof pitch.
OR... you may have purchased preholed slate in which case your supplier will tell you what headlap they are holed for.. often 100 mm these days

 

[onecog]

My slates are 500mm and drilled 200mm from the top so i'm thinking that my batons should be 200mm ?

thanks