Clout nails longer than batten thickness?

[bradders3109]

Hi All,

 

After almost four years of a very slow and painful build we are about to put a roof on, thank god.

 

I'm using Tapco Slate Classic and according to the installation instructions these should be laid on a 50mm x 25mm batten using 30mm clout nails. 

 

Since the clout nails are longer than the batten thickness won't this result in numerous punctures to the impermeable membrane which is recommended?

 

Am I unduly worrying or is this a specification error?

 

I've already resolved one conflict in the installation manual whereby the tapco manual states a minimum 25mm drape for the underlay but the recommended underlay installation states a maximum of 15mm drape.

 

Any help or advice would be much appreciated.

[Dave Jones]

no, you have the width of the tile to account for as well.

[joe90]

Tapco's are 5mm thick and due to the slates “stacking” they will not rest flat on the batten giving 1 or 2 mm more so 30mm clouts should be ok!

[bradders3109]

Thanks for the responses fellas.  I had thought about the tile thickness but didn't think it was 5mm.

 

I just spoke to the technical guy at tapco and he said exactly what you have stated.  Tile thickness and camber will be more than 5mm.

 

Thanks again