As the title suggests, can make out the blockwork on the plaster of a 14 year old house on the external walls indoors.
The plaster is traditional wet plaster; ie NOT dot and dab.
It's a bungalow. Cavity insulation is celotex type sheets touching the inner wall, whilst leaving a cavity on the outer wall.
The top of the cavity is blocked with some flimsy plastic sheeting. There is a vent in the floor which ducts out through the wall to the outside.
The blockwork pattern shows the cement joints to be the darker areas on the wall. The plaster feels smooth. It is currently emulsioned, no paper.
What is causing this and can anything be done?
The room is due to be re-emulsioned in a week or so. Should some sort of paint be applied first to prevent the dark lines re-appearing?
Thanks in advance.
EDIT. The floor, as I can make out, is a floating chipboard floor, not sure if there is insulation below that, presumably on a concrete base.
The blockwork is thermalite.
The plaster is traditional wet plaster; ie NOT dot and dab.
It's a bungalow. Cavity insulation is celotex type sheets touching the inner wall, whilst leaving a cavity on the outer wall.
The top of the cavity is blocked with some flimsy plastic sheeting. There is a vent in the floor which ducts out through the wall to the outside.
The blockwork pattern shows the cement joints to be the darker areas on the wall. The plaster feels smooth. It is currently emulsioned, no paper.
What is causing this and can anything be done?
The room is due to be re-emulsioned in a week or so. Should some sort of paint be applied first to prevent the dark lines re-appearing?
Thanks in advance.
EDIT. The floor, as I can make out, is a floating chipboard floor, not sure if there is insulation below that, presumably on a concrete base.
The blockwork is thermalite.