predrilling sweet chestnut

[offgridchris]

i know this isn't strictly a milling question.

i have split 700 sweet chestnut shingles(shakes) and have just predrilled them with a 2.5mm drill bit.

 

now im nailing them on im worried that i should have drilled them with room to spare around the copper nail (diameter 3.35mm).

 

i don't want to drill them all again but i really don't want them to split after ive put them on the roof.

 

any advice welcomed.

 

thanks chris

[Ian Leach]

Personally I would of drilled to at least 5mm to allow for movement

 

Sent from my HTC using tapatalk

[offgridchris]

ian, thnaks for the reply. just as i thought.

 

funny how when somebody sounds like they know what they are talking about you tend not to question it.

 

im gonna redrill them all.

 

thanks