February 21Feb 21 I’m looking at this detail in the drawings and noticed the ‘site fitted batten’ I can’t see this but also wonder if it’s necessary as looks horizontal which would surely block the service cavity created by the vertical battens. Given it’s in the eaves I may not need the service cavity. What’s not shown in the drawing is the ybs super quilt under the vertical battens. I’m probably missing something obvious 🙄 Sorry I haven’t got any actual photos as not on site at the moment.
February 21Feb 21 Forgive me if I’m being more thick than usual, but is that a cross section detail of the joist/downstairs panels/ upstairs panel junction?
February 21Feb 21 It is normal to have a top and bottom bar to a service void. Drill or leave a notch where you know services will pass thtough
February 21Feb 21 Author 5 minutes ago, ProDave said: It is normal to have a top and bottom bar to a service void. Drill or leave a notch where you know services will pass thtough Thanks that’s helpful…. Another job the TF sub contractor was supposed to have done but didn’t 🙄
February 21Feb 21 Author 31 minutes ago, G and J said: Forgive me if I’m being more thick than usual, but is that a cross section detail of the joist/downstairs panels/ upstairs panel junction? Yes cross section of ground floor to first floor junction
February 21Feb 21 3 hours ago, junglejim said: I’m looking at this detail in the drawings and noticed the ‘site fitted batten’ I can’t see this but also wonder if it’s necessary as looks horizontal which would surely block the service cavity created by the vertical battens. Given it’s in the eaves I may not need the service cavity. What’s not shown in the drawing is the ybs super quilt under the vertical battens. I’m probably missing something obvious 🙄 Sorry I haven’t got any actual photos as not on site at the moment. Shouldn't the VCL finish behind the battens? If they're service battens, or is there additional insulation going in between?
February 21Feb 21 Author 1 hour ago, Nickfromwales said: Shouldn't the VCL finish behind the battens? If they're service battens, or is there additional insulation going in between? Yes good point… I was planning on lapping up under the ybs superquilt and taping together so would need to do that before adding horizontal batten presumably. Edited February 21Feb 21 by junglejim
February 21Feb 21 Effective Insulation to Save on Energy Bills YBS SuperQuilt Trade is a high-performing multifoil home insulation. It has a built-in vapour control layer when fully taped and sealed using ThermaSeal Foil Joining Tape. It’s been specifically designed with the tradesperson in mind due to its flexibility, high quality, and ease of installation. SuperQuilt Trade ensures your home retains more heat during the winter and maintains a cooler temperature during the summer, creating an ambient temperature all year round. It can be used on walls, floors, lofts, ceilings, roofs, conservatories, and many more! SuperQuilt Trade’s R-Value is up to 2.84 m²K/W which is the equivalent of 125mm of Mineral Wool. It’s made from 19 layers of thermally efficient layers. It is 40mm thick however compresses down to only 10mm during installation, saving on cost, space, and installation time compared to Kingspan and Celotex. YBS SuperQuilt Trade contains no floating or harmful fibres. It requires no PPE such as masks or goggles to install, unlike traditional mineral wool. People who have been wasting time fitting 125mm of mineral wool will be devastated that they've wasted all that thickness of wall and time / money...........or they won't.
February 21Feb 21 Jeez, about 15 years ago i used the 30 layer stuff in a loft conversion. At the time nobody had said that it was snake oil. It was a bit of a faff to fit, and tape etc. Now, to be honest, the room created, never got cold, never over heated, and the radiator was never turned on. I dunno, is it really that bad ?
February 21Feb 21 I will add that before i added a batten for services, and plasterboard, it was like being inside a space module, being blasted to the moon. Beam me up Scottie.
February 21Feb 21 12 minutes ago, Big Jimbo said: Jeez, about 15 years ago i used the 30 layer stuff in a loft conversion. At the time nobody had said that it was snake oil. It was a bit of a faff to fit, and tape etc. Now, to be honest, the room created, never got cold, never over heated, and the radiator was never turned on. I dunno, is it really that bad ? What if you fitted the 150mm of rockwool and it was way better?
February 21Feb 21 17 hours ago, Big Jimbo said: Well i ain't gonna know that @Nickfromwales cause i didnt do that. 17 hours ago, Big Jimbo said: I can't go back and test it, cause i sold the gaff. Probably a fictitious house that never actually existed, and you're posting from a padded cell (like me).
February 21Feb 21 Nothing particularly wrong with multifoil, but it needs to be used correctly and have the correct airspace either side of it, which is often not built-in. I wouldn't use in isolation, but with other insulation. But when you take into account the correct air spaces either side, it doesn't save any space, compared to mineral wool
February 22Feb 22 Author 18 hours ago, JohnMo said: Is that your main insulation? No I have PIR between studs then ybs super quilt over the top and battened in place
February 22Feb 22 2 hours ago, junglejim said: No I have PIR between studs then ybs super quilt over the top and battened in place So do you have suitable air gaps either side of the super foil? You need these sizes of battens either side to get the performance advertised. If you haven't bought or started doing insulation yet, I would use Mineral wool between studs (Rockwool Flexi or Frametherm 32) then full sheets of PIR on top of studs and a small service void batten. Edited February 22Feb 22 by Nickfromwales
February 22Feb 22 18 hours ago, Nickfromwales said: SuperQuilt Trade is a high-performing multifoil home insulation. When compared to lower performing insulation such as newspaper or plastic sheet pinned to timber.
February 22Feb 22 2 minutes ago, saveasteading said: When compared to lower performing insulation such as newspaper or plastic sheet pinned to timber. Indeed. FWIW, to the OP, this has been thrashed out here previously, and yielded much the same results.
February 23Feb 23 On 21/02/2026 at 21:02, Nickfromwales said: SuperQuilt Trade’s R-Value is up to 2.84 m²K/W Or a U-Value of 0.35 W.m-2.K-1. U = 1 /R. Half the BR's wall regulations. Mineral/Rock wools, at 135mm thickness is 0.3 W.m-2.K-1 (at a k-value of 0.04 W.m-1.K-1. So not really sure what to make of that claim, other than they have somehow factored in ventillation losses. Edited February 23Feb 23 by SteamyTea
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