Jilly Posted September 1, 2020 Share Posted September 1, 2020 (edited) Take care, my builder ordered £1k worth of TXL Batsafe membrane, and it isn't bat safe at all and has to go back. Only F1 bitumen will do. Edited September 1, 2020 by Jilly extra info Link to comment Share on other sites More sharing options...
PeterW Posted September 1, 2020 Share Posted September 1, 2020 I take it you have high levels of bat activity then ..?? Is this the ecology officer who has said no.? Link to comment Share on other sites More sharing options...
Jilly Posted September 1, 2020 Author Share Posted September 1, 2020 We found just one pipistrelle bat when the building was stripped... The ecology officer has said no, but there is lots of controversy about this product when you look for it. Builder is now worried about ventilation and how to square it with BC Link to comment Share on other sites More sharing options...
joe90 Posted September 1, 2020 Share Posted September 1, 2020 In our planning fight our ecologist agreed that I could build bat boxes into the roof of my workshop to stop having bats in the house, planners said we still want them in the house. At the appeal the gov inspector told the planners they were not qualified to over rule the ecologist ? 1 Link to comment Share on other sites More sharing options...
willbish Posted September 1, 2020 Share Posted September 1, 2020 If you use a sarking board and then a modern membrane on top the ecologist can't see the membrane from inside the attic space.... Not that I have applied this approach ? 1 Link to comment Share on other sites More sharing options...
Jilly Posted September 1, 2020 Author Share Posted September 1, 2020 I agree it's bonkers that I have to invite bats in where there were none. Or wasps... Link to comment Share on other sites More sharing options...
Big Jimbo Posted September 1, 2020 Share Posted September 1, 2020 I feel very lucky. I see bats every evening in the garden. With my knock and build i'm not required to have any reports bat or otherwise. Link to comment Share on other sites More sharing options...
joe90 Posted September 1, 2020 Share Posted September 1, 2020 2 hours ago, Jilly said: I agree it's bonkers that I have to invite bats in where there were none. Or wasps... If you had no bats why are the planners making you cater for them??? Link to comment Share on other sites More sharing options...
Jilly Posted September 1, 2020 Author Share Posted September 1, 2020 Good question. The bats were in the featherboarding and will have nice new homes there too, should they chose to use them... Link to comment Share on other sites More sharing options...
joe90 Posted September 1, 2020 Share Posted September 1, 2020 3 minutes ago, Jilly said: The bats were in the featherboarding Ah! so you did have bats, so did we but I was able to move them out to the workshop with the help of the ecologist. Link to comment Share on other sites More sharing options...
Jilly Posted September 1, 2020 Author Share Posted September 1, 2020 We found one during the hand strip (which has cost about £6k altogether) (not that I'm sore about it, can't you tell?), but we have to accommodate them back into the building. Didn't you have to? Link to comment Share on other sites More sharing options...
joe90 Posted September 1, 2020 Share Posted September 1, 2020 23 minutes ago, Jilly said: Didn't you have to? No, the ecologist supported my option of housing them I’m my detached workshop roof (even tho the planners wanted them in the house as well). Link to comment Share on other sites More sharing options...
Conor Posted September 1, 2020 Share Posted September 1, 2020 1 hour ago, joe90 said: No, the ecologist supported my option of housing them I’m my detached workshop roof (even tho the planners wanted them in the house as well). That's exactly what we are doing. I'm using bat friendly cladding and roofing on a shipping container workshop in the garden. In these situations, the planners are meant to follow the guidence of the relative experts. 1 Link to comment Share on other sites More sharing options...
Jilly Posted September 2, 2020 Author Share Posted September 2, 2020 19 hours ago, Conor said: I'm using bat friendly cladding Mmm, my point is that the stuff which claims to be bat safe isn't. Anything which is breathable polyester based stuff tangles in their feet and traps them. There are lawsuits going on, not surprisingly, about the misleading name. But imagine if we had put the stuff on, finished the roof, then the ecologist had demanded that we use F1 bitumen (the only really safe stuff, apparently). What a who ha of blame that would be. As it is, it's had to be bounced back to the architect, as BC wouldn't comment about the need for a different ventilation solution. Watch this space. Link to comment Share on other sites More sharing options...
Temp Posted September 2, 2020 Share Posted September 2, 2020 On 01/09/2020 at 12:50, Jilly said: Builder is now worried about ventilation and how to square it with BC Typically you either need a vapour permeable membrane or a 50mm ventilated void below a non permeable membrane. The latter causes issues with the depth of insulation between rafters. You may need more insulation below the rafters. An alternative might be to switch to a warm roof which puts insulation above the rafters but raises roof height. That doesn't need ventilation but it's important to get an interstitial condensation risk assessment done for the proposed design. Don't let the builder just wing it. 1 Link to comment Share on other sites More sharing options...
JamesP Posted September 2, 2020 Share Posted September 2, 2020 I have had to provide 72 sqm of bat roost in the garage roof all lined with Bitumen F1. And a heater. The joy. 1 Link to comment Share on other sites More sharing options...
Jilly Posted September 3, 2020 Author Share Posted September 3, 2020 19 hours ago, Temp said: Typically you either need a vapour permeable membrane or a 50mm ventilated void below a non permeable membrane. The latter causes issues with the depth of insulation between rafters. You may need more insulation below the rafters. An alternative might be to switch to a warm roof which puts insulation above the rafters but raises roof height. That doesn't need ventilation but it's important to get an interstitial condensation risk assessment done for the proposed design. Don't let the builder just wing it. Thank you, I think this answers the question, apart from the fact we are a conversion in a conservation area and can't change anything... Link to comment Share on other sites More sharing options...
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