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Well, the contract specifies that your builder will cover the RSJ. If they did not do that then they are in breach of the contract and thus liable to either complete the work at no additional cost or reimburse you.

I don't think anybody can force you to move out. The work is still in progress so does not need to meet building regulations. I lived in my house for months with no back wall, exposed RSJ, no hot water heating or lighting... It is to be expected that the property will not meet regs while work is...

That's what I meant to say - they're not a fire hazard, but are more hazardous in a fire if uncovered ;)

When building our extension we were told by our building inspector that exposed RSJs are illegal as they are a fire hazard. We were told that we must cover all RSJs with two layers of plasterboard.

Thank you once again everybody for your support with this issue. Over the last two days we ripped down the plasterboard to expose the 100mm celotex between the rafters. Some of the gaps were so big you could put your hand in, so it's really no surprise we had problems. Taking out some of these...

Thank you once again everybody for your support with this issue. Over the last two days we ripped down the plasterboard to expose the 100mm celotex between the rafters. Some of the gaps were so big you could put your hand in, so it's really no surprise we had problems. Taking out some of these...

We were told by another contractor that the celotex should have been raised slightly so it was in the middle of the rafters and not in contact with either the breathable membrane or the insulation (or in our case plasterboard) below. Thank you. Is there any advantage to using an additional...

Thank you both very much for taking the time to respond. Is there any benefit to adding a separate vapour barrier? Or is the foil backing of the celotex and the foil tape adequate for this? For example, would adding the foil bubble sheeting in addition to the other changes you described...

Hi all, We posted last year because we were having damp problems in the ceiling of our self-built extension. We hired some builders to insulate, construct and plaster the ceiling as we were unable to do this ourselves. We subsequently found that the ceiling was under-insulated, had no vapour...

So do you mean that there should be insulation underneath the rafters themselves, actually below them?

So do you mean there should be two vapour control layers, one under the rafters and another above the plasterboard? Should this have been specified on the architect's drawings?

@noseall Many thanks for your response. I will do my best to answer your questions. The roof was designed along with the rest of the extension by an architectural technologist, and drawings were produced. Yes, it is a vaulted sloping roof. That's interesting. Our roofer suggested the...

Hi all We have had a 4m single story extension built on the back of our house. The roof has a 15 degree pitch and is tiled with Sandtoft plain interlocking tiles. The carcass is constructed from 2x7 timber with regular noggins. It is felted with breathable membrane, and insulated with 100mm...