Aldrige63

I'm probably paranoid but now the roof has just been left with the one layer of fibreglass from the 'cure it' kit, directly on top of the OSB boards exposed to the rain. As in you can see the OSB boards through the layer of fibreglass. Is this normal/waterproof? I know these things say they are waterproof but given it's not the final layer of the roof to actually make it water tight, I'm not sure why its a good idea to leave it exposed to the rain and water sitting on it, given it's a flat roof. Am I wrong or should this be covered until the final roof layer goes on?

Thank you. There's one other photo a few posts above showing the inside off the roof, which the workman would be able to tell is our home if they saw it. If that could be removed then happy for the thread to remain as hopefully of some use to others.

That's a fair point. The issue is I'd rather then builder didn't see it to avoid difficulties in communication. If the photos were able to be removed to essentially stop the property from being identified, that it wouldn't be an issue for the thread to stay.

Is there any way for me to delete / remove this thread now?

So still have some sort of ventilation device even if it's a warm room?

I actually just spoke to the builder and he tells me it's going to be a warm roof. So there's another layer going on top of what is already there. That's reassuring. So currently from bottom up there is timber frame. OSB flat on top of the timber frame. Breathable membrane flat on top of the OSB. And he tells me there will be insulation on top of this and......I'm not sure of the next bits but he said it's a warm roof?

Thank you all for the sound advice. I was hoping to be able to clear/delete this thread / my posts not to disclose this all publicly at this point. Is that at all possible?

Thanks. Sounds like a warm roof would have been a better option. Would it be easy to revert to a warm roof from this point? Or does it require an entirely different structure? The room will have heating and the internal membrane as you say. Continuous mechanical ventilation, that hasn't been planned but if you have an example of something suitable I could maybe look at that being installed.

This is the currently from the inside so yes I assume insulation board will go in the gaps her beneath. On top it's just the breathable membrane currently directly/flat against the OSB. I don't know what waterproof membrane he's going to be using yet. Is this all ok how it's done so far? Image attached. It's a skylight in the middle where the square is, just for reference.

I'm confused by this. It's a missed opportunity to make a warm roof which is a bad thing I assume? But also it will make condensation and therefore mould much more unlikely in future? As in not having a warm roof would make it more unlikely that we'd get condensation and mould or having a a warm roof would make it more unlikely. Confused by your wording, sorry. He may walk put insulation between the beams under the osb board later on but I'm not sure.

Hmm. Thanks. I've just had so many issues with damp and mould before and it my experience just drying something doesn't get rid of mould. Once it's wet that's it, the grows and the remains there. But unbeknown to us it's hidden behind a ceiling but can still be impacting your health. I'm probably over the top about it but it's a flat roof so isn't had to just throw something over the top to keep it dry at the end of each day.

Have now also spotted this. Water dripping through the beams around where the skylight is due to go.

Hi all, I wonder if someone can advise. I'm having an outbuilding built for an office. It's a brick structure with flat roof and has timber support beams, flat layers chipboard/OSB on top of the beams, and then a layer of Vent 3 classic breather membrane over the top of the chipboard. My concern is the roof is being left exposed to the rain while the builder is off doing other jobs. I've read that the membrane is "water resistant" but also breathable and has "moisture vapour permeability". I can see the water droplets sitting on top of it but given it's breathable/permeable, I assume these gradually move through the membrane. With just OSB sitting directly underneath, is this an issue? I'm concerned the OSB boards are going to get soaked/damp/mouldy and lead to damp issues when the roof is later sealed off. I could be worrying about nothing but I really want to avoid damp and mould as we've had ongoing issues with this before. I know the simple solution would just be to have some waterproof cover sheet over the top of it but I've asked him to do this for various thighs and he never seems bothered about things getting wet and I asked him to cover the roof today as they have a waterproof roll of black plastic there (not sure if the name) and he hasn't bothered doing it.