cavities blocked NHBC wont fix

[kizerzose]

hello all, first post, i currently have a claim running with the nhbc, we have many problems with a new build, now 9 yrs old, i have a suspended cast in situ concrete floor, minimum thickness 150mm, mines measures 107mm, also the cavities are quite substantially blocked above dpc level.
we know about this because i got them to open up the outside wall to investigate the floor slab as i have a 32mm run from front to back in my lounge.
so to the point, the nhbc will not fix the blocked cavities because they are not causing any damage (not now what about when my nhbc cover expires?) also the concrete thickness min 150mm mines is 107mm, that's fine as well no problem according to them, what is the point of building regs and specifications if the builder just does what he likes.
the drawings for my house show a ground bearing slab, but i have a suspended floor like the houses near me but they are pilled foundations, mines strip, nhbc said the builder must have decided to change the slab type on the fly.........WTF. so i do not have a specific drawing for my house, its a mix between pile foundation and strip, and suspended and ground bearing.

when the wall was opened up we found the slab has been cast on top of polystyrene sheets, fine its insulation, but in this case its been taken right under the slab between the under building block work and the slab so the whole house is sitting on a big soft joint between blockwork and floor slab
like an expansion joint.

i have damage on first floor tape pulling at ceilings and vertically in corners 45' cracks in tiles in kitchen on grnd floor.

thinking of getting independent survey done.

sorry its so long but, any thoughts?

 

[^woody^]

Yes get a report done, but make sure that the surveyor is conversant with the NHBC Buildmark Warranty. Or get specialist advice from a company such as www.newhomeadvisor.co.uk that deal with snagging and specifically the NHBC

 

[theoldun]

You have our sympathy, as it would appear that you have had the NHBC resolution team to inspect and received their report.
If they have not agreed to do anything, then without spending a lot of money, that is end of story.
There are to many exclusions in NHBC Buildmark 8 to 10 year guarantee especially in Sections 3 and 4.
The builder whose back the NHBC live of have just two exclusions in the initial 2 year guarantee period and both are debateable.
If NHBC cover was not required by mortgage companies, for new homes, NHBC would not be in existence.
About all you can do is make your self a continual nuisance, and as woody has suggested get a good surveyors report done.
Regards oldun