EDN Velux flashing (recessed) installed on sarking (Scotland)

[Ant1]

The manual for the EDN Velux flashing is showing the following but it is mainly for a batten installation used in England.

In Scotland most slated roof make use of sarking.

My question is regarding the bottom of the Velux, according to the diagram I need to leave a 140mm gap for the flashing, is it normal just to leave a gap / void of 140mm below the Velux? (seems odd)

I guess this 140mm wide strip will be a fragile part of the roof and people should not walk on it, right?

I found some info at https://www.yarddirect.com/blog/hav...-the-velux-edn-flashing-yard-is-here-to-help/

Anyone has experience of installing EDN Velux flashing on sarking?

 

[catlad]

If you don't leave that area free then the bottom apron won't fit.

 

[datarebal]

As above , it's because you are using a recessed flashing .

 

[Ant1]

Thanks all, I will add a piece of timber between the joist underneath this part of the flashing, this will provide some support in case someone steps on it.