YBS fill to osb?

[junglejim]

The inside of my timber frame has YBS foil held in place with battens. I’m doing this into the vaulted ceiling which has osb on the inside face. I’ve marked where rafters are top and bottom so can run a laser to project the line and ensure battens go the same direction and through into rafters but I’m struggling with positioning and holding the foil in place until I batten. I’ve initially stapled to hold in place and then batten It would seem easier to run the ybs in vertical strips as makes tapping the joints easier but would welcome any advice on installation as definitely feels like I’m not being particularly efficient at the moment.

 Thanks

[Iceverge]

Just tape the OSB for airtightness and forget the YBS. Insulate the service cavity with mineral wool. 

 

Ideally run the battens at 90deg to the rafters. 

 

 

[junglejim]

Thanks. I’ve taped osb for the airtightness and have 175mm insulation behind. Advice and spec from TF supplier was to add ybs super quilt on top as vcl.

I’m going to batten and counter batten to provide enough of a service void for downlighting.

[junglejim]

I’m thinking now that my battens should run the other way ie; first layer of battens horizontal and then counter battens vertical so that plasterboard is better supported?