Verge detail for membrane

[garyo]

Hi, when running membrane into/over a verge, am I correct in running it under the cement board (over rafter top) then tucking it down behind fascia board?

Thanks!

 

[Barthy]

Yes underneath undercloak.
No never behind fascia, you'll have to have a play about with the eave tray and felt to get the undercloak tight to the box end barge but it's achievable.
Mortar should be bonded to the undercloak not the membrane (in an ideal world)

 

[garyo]

No never behind fascia, you'll have to have a play about with the eave tray and felt to get the undercloak tight to the box end barge but it's achievable.

Can you elaborate on that a bit. Do you mean staple it to the top of the fascia board?

 

[Barthy]

Undercloak must sit flush to the barge and box end but assuming you are using eave trays/5u you will have to doctor membrane or leave the eave protection short enough to do this whilst ensuring membrane is under neath the Undercloak.

 

[garyo]

Thanks. Yep I'm using trays at the eaves. I'd not got as far as thinking about the intersection between verge and eaves, so I'll give that some though next. As you say, I have tray/membrane/undercloak all intersecting.