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More likely it's getting past the ply. I would seal it up top and bottom. You certainly don't want warm humid room air continually going in to a cold loft space.

We haven't had any issues, but I take the point. I would certainly take your suggestions on board (!) next time I do something similar. always interesting to hear thoughts from the more experienced people... :)

I would seriously think about this. When we IWI our small cavity wall, I discussed with our BCO about his view on interstitial condensation. We both came to the conclusion that when it occurred the ventilation in the cavity would evaporate it. Our cavity is very well ventilated. And so it has...

When we did our 1902 with a 50mm ventilated cavity we dabbed the insulated PB (72.5mm) straight to the brick. We don't have many electrics on external walls but where there were some, the PB went straight over the top with the sparky's approval. That was 7 years ago. It's been 100% fine since...

Not so fast! Just about all new doors, except very expensive ones, are laminated over engineered wood cores. They can be OK, but in exposed conditions, no matter how much care you take with paint and sealer, risk delamination. If that door is solid wood, and otherwise decent quality, I would...

The treads and risers need replacing. You need access underneath. It's DIYable (I've rebuilt our own staircase) - the timber is fairly inexpensive but needs to be installed correctly with wedges, or find a decent old-school chippy

It might look a bit odd with simple coving, but certainly do-able, but TBH, it's probably easier to take the coving down, overboard and put new simple coving up.

+1 for the manthorpe system. It was recommended to me by my local roofing supplier, and I've used it on a couple of buildings now. Easy and decent quality.

https://media.siniat.co.uk/pi48560/original/-1174719165/0582-sin-how-to-thermal-dl-rebrand-v2-digital.pdf

Prestatyn? Isn't that what the actress said to the Bishop?.... I'll get my coat... Merry Christmas

In my book they are the work of the devil. I won't take anything preventative - only stuff that is actually treating something at the time.

Whatever they have done, it isn't right, because the whole point of ventilation is to keep the fabric of the roof dry, which yours obviously isn't.

You might be overlooking the fact that to actually take the readings you have to open the loft hatch, which lets a load of nice warm humid house air rise up in to the loft, and the cold air in the loft descend down in to the house. It could be, but the danger is then thermal inertia. If the...

so call loft temp 10 degrees. saturated vapour density at 10 degrees = 9.21. X 93% = 8.56 which is the saturated vapour density at about 8 degrees. Any surface colder than that will have liquid condensation. If it's 7 degrees outside, quite likely the inner roof surface is approaching 8...

If you get the physics you should be able to work it out. Sounds like the additional insulation has made the loft colder allowing more condensing surfaces.

Hardly surprising. I expect that the loft isn't perfectly sealed to the house, and/or you are letting house air in to it at ~20 degrees and probably 50-60% humidity. The problem is that air at that temp and humidity will start condensing to liquid water at about 12 degrees, and of course at the...

I'd swing in. Sometimes you might want to be in there without the door shut, and you can't do anything with that bit of wall the door would open against anyway.

except Accoya.... Having made several external doors and windows for our house, I can confirm you can make them with tiny clearances and they don't change winter and summer.

Perhaps the multi-trade bathroom installer doesn't have hot work insurance? It's perhaps not a case of "can't do", but "won't do" in that situation.

Stud dividing wall? all the fixings will be in shear. You could actually glue the header to a plasterboard ceiling with grab adhesive and just pop a couple of small fixings in to counter any (unlikely) really hard impacts it might receive, and that non-structural dividing wall would still be...