VCL junction first floor

[junglejim]

Just working out best way to tape this junction. The vcl is lapped around the cassette from bottom floor to top. Should I trim and lap under the ybs and then tape or just tape direct to the ybs as it is… seems like there’s no gain in folding and extra work. 
any thoughts?

 Thanks

[Nickfromwales]

Odd that it wasn’t taped up before the battens went on. Were the upper walls pre-fabbed?

[junglejim]

1 minute ago, Nickfromwales said:

Odd that it wasn’t taped up before the battens went on. Were the upper walls pre-fabbed?

Yes prefabbed. Came like that with vertical battens

[junglejim]

Just now, junglejim said:

Yes prefabbed. Came like that with vertical battens

 

3 minutes ago, Nickfromwales said:

Odd that it wasn’t taped up before the battens went on. Were the upper walls pre-fabbed?

On most walls there’s enough space to lap up underneath by about 7cm without removing battens. But presumably would still need taping regardless so not sure if there’s any advantage to that.

[Nickfromwales]

1 hour ago, junglejim said:

 

On most walls there’s enough space to lap up underneath by about 7cm without removing battens. But presumably would still need taping regardless so not sure if there’s any advantage to that.

I’d jimmy the bottom 600 mm of batten to get a gap, lap it up and tape it, then use screws to pinch the battens back into place. 
 

Taping around the battens is a bit crap (imo) so I’d go the extra mile as the vapour barrier is very important in such a dwelling.

[Russell griffiths]

1 hour ago, Nickfromwales said:

I’d jimmy the bottom 600 mm of batten to get a gap, lap it up and tape it, then use screws to pinch the battens back into place. 
 

Taping around the battens is a bit crap (imo) so I’d go the extra mile as the vapour barrier is very important in such a dwelling.

I would do this. ⬆️

[junglejim]

On 12/04/2026 at 14:16, Nickfromwales said:

I’d jimmy the bottom 600 mm of batten to get a gap, lap it up and tape it, then use screws to pinch the battens back into place. 
 

Taping around the battens is a bit crap (imo) so I’d go the extra mile as the vapour barrier is very important in such a dwelling.

Thanks. Does it matter how much overlap there is. The battens are about 60mm off the floor so could tuck underneath and tape the overlap without lifting the battens.

[Nickfromwales]

38 minutes ago, junglejim said:

Thanks. Does it matter how much overlap there is. The battens are about 60mm off the floor so could tuck underneath and tape the overlap without lifting the battens.

That’ll be plenty. Just wipe everything with a cloth to get dust cleaned off, so the tapes stick well. 👍