Verge ventilation detailing

[Hilldes]

Have searched Buildhub on this but could not locate. Will have render board with silicone thin coat render. For the gables and verges, there is no barge board planned - the render will meet the undercloak for the slate tiles.

 

For the eaves we eaves we have fascia mounted vent strips.

 

For the verges, I've looked at data sheets/BBA certs for the most likely render board products (Knauf Aquapanel Exterior and Multirend), but can see no detailing on how to provide ventilation at the verge. How have others with render board done this please? 

 

This pic shows render upto the undercloak:

 

This pic shows the proposed layout of battens to hold the render board:

 

[tonyshouse]

Better off rendering to the underside of the slates, undercloaks drag water into the wall and parging which cracks and falls out. 
 

no need for verge ventilation generally, eaves and ridge do it all 

[Hilldes]

1 hour ago, tonyshouse said:

Better off rendering to the underside of the slates, undercloaks drag water into the wall and parging which cracks and falls out. 
 

no need for verge ventilation generally, eaves and ridge do it all 

Thanks @tonyshouse I was kind of expecting the answer to be the main ventilation of via the eaves due to lack of detail when googling verge ventilation. The technical product manger of Knuaf has been really helpful with detailing (e.g. abutments) but he is on holiday until 12 April.

 

The roofer has already said we don't need to undercloak with slate, but I left them in until we have a chat tomorrow where I'll learn how he will do without.

 

There is not that great an area to be rendered anyway on the gables:

[dpmiller]

what about a continuous verge trim?

 

https://www.kytun.com/c/slate-dry-verge/7

[Hilldes]

1 hour ago, dpmiller said:

what about a continuous verge trim?

 

https://www.kytun.com/c/slate-dry-verge/7

Thanks @dpmiller you mean a dry verge as alternative to wet verge or to aid ventilation in some way?

[dpmiller]

yes dry, gives a clean edge to render up to, and if you're interested in ventilation there's a bit at the tile edge although I'd agree that eave and ridge are more important.

[Hilldes]

42 minutes ago, dpmiller said:

yes dry, gives a clean edge to render up to, and if you're interested in ventilation there's a bit at the tile edge although I'd agree that eave and ridge are more important.

 Thanks, will talk with roofer tomorrow. Like the idea of a nice crisp edge.