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Quick update, which may be useful to people reading this thread later... BC have notionally (pending inspection after opening up) accepted the solution to add insulation internally between the rafters, which is by far the easiest way to resolve the issue. In addition, I need to submit plans...

I didn't submit a plan for work before the builder started, and didn't get BC to inspect the work in progress: I believed it was for the builder to comply with BC, and not my responsibility. That was my mistake and one I won't make again. I don't think I have any paperwork from the builder that...

Thanks, I do hear you, but I'm not talking about what BC will accept, I'm talking about whether the builder knew that 100mm was too thin. That's important because it lets me build a case for reimbursement/ammendment against the builder.

As far as I understand it, there's virtually no way that 100mm would meet the requirements, and I've no doubt he was aware. Even if he's not aware, the job doesn't meet the spec, so he needs to address the issue. A replacement roof, but a conversion from garage to living space, so change of use...

A builder who specified the roof. I'm in contact, so expecting to have that discussion, but need to understand what BC might allow to resolve. There are several other issues too, but this is the main one. Thanks, didn't read the descriptions. Glad to hear this is a workable solution: it means...

This is what worries me: if you add insulation below, then the deck isn't as 'warm' as the room, so could collect condensation, requiring ventilation, like a cold roof. Not sure how likely that is with 100mm of solid insulation above though.

Building regs L1B (https://www.gov.im/media/1346190/approved-document-l1b-2010.pdf) section 5, flat roof. Requirement is 0.18W/m2K, and yes, higher is worse, so must come in below 0.18.

Hi, I've recently had a flat roof (warm) installed by a local contractor, who used 100mm Kingspan over the main deck, followed by torch-on felt. BC now advise that the insulation is too thin: 100mm gives 0.22W/m2K, requires 0.18W/m2K. Is that reasonable? What is my recourse? can anything besides...