Mold and condensation in cold deck flat roof-new install

[Radian]

There are CWI solutions that could be applied retrospectively. Walltite is one option. If the 50mm PIR is correctly held against the inner leaf then the injected foam will happily fill the remaining 50mm. 

[ProDave]

I am so sad for you, this is a shocking example of shocking builders both for not following the plans and not even discussing with you when they want to change something.  Ditto building control.

 

WHO appointed building control, you or your architect?  Is your architect involves still and supposed to be supervising this?  Who appointed the brickie and joiner? you or the architect and under what terms where they appointed?

 

You need to understand the chain of command here before you can decide who is at fault and what action to take.  I would certainly STOP any further work until a resolution plan is agreed.  Is the outer covering of the flat roof on already?

 

This is why I project managed my own build and watched like a hawk everything that was done, but thankfully I had appointed builders I knew and trusted and they discussed any changes before implementing them, and they were mostly changes for the good.

[Radian]

9 hours ago, Paul Alan said:

Especialy when you're paying LABC to oversee the works.

Not really. They're just checking that building regulations are being adhered to where they're applicable. They don't give a fig about how well or sensibly a thing is built. Just that it meets regs. Any solution they agree to with a builder to make things meet regs is probably coming from the builder.

[ProDave]

23 minutes ago, Radian said:

Not really. They're just checking that building regulations are being adhered to where they're applicable. They don't give a fig about how well or sensibly a thing is built. Just that it meets regs. Any solution they agree to with a builder to make things meet regs is probably coming from the builder.

In Scotland, you have to submit full plans, there is no simple building notice option.  Building control approve the plans before you can start and then their inspections are to determine it has been built according to the plans.

 

If something changes, and they deem it important (I would expect such a massive change in the insulation spec to be so) they will insist on a new set of drawings to show the changes.

 

As this is an extension, it might be being built under a building notice where it is everything agreed as you go.  but as the client I would want to be involved in any discussions changing anything.

[Paul Alan]

16 minutes ago, ProDave said:

In Scotland, you have to submit full plans, there is no simple building notice option.  Building control approve the plans before you can start and then their inspections are to determine it has been built according to the plans.

 

If something changes, and they deem it important (I would expect such a massive change in the insulation spec to be so) they will insist on a new set of drawings to show the changes.

 

As this is an extension, it might be being built under a building notice where it is everything agreed as you go.  but as the client I would want to be involved in any discussions changing anything.

No it was a full plans submission, they even came out this week to "check" the insulation pre plaster. Neither the joiner nor BC ever once mentioned anything about a vapour control layer to us.

 

Im picking up some foil tec double today which is a vapour control layer and is also insulative to equivelant of 65mm mineral wool, ive got some white vinegar to clean the roof too so hopefully we should be in a better position going forward, probably still not ideal but  an improvement.

 

Thank you for all your input and advice.