Black spots

[DClifford65]

Black circles have appeared on new membrane of 2 months!! It looks like mould and is getting worse more so when damp outside and has been raining!! The council have covered it all up with the new skirting boards!! And seem to think the problem will go away??? Can anyone please help !!

 

[MakeItSmooth]

This might be of interest to you:

Court beckons for all landlords with damp property, warns Safeguard - Plasterers News

Since March, all tenants – whether in private or social accommodation – can now sue their landlords if their homes have health-damaging defects. This is thanks to the Homes (Fitness for Human Habitation) Bill 2017-2019, which came into force for new tenancies from 20 March 2019 and, from now...

www.plasterersnews.com

 

[sand/cement1/dot/dab]

Looks like moisture, no air flow ,
Maybe all vents been blocked up etc