Bubbling Paint & Blown Plaster
When paint blisters and plaster crumbles away low on a wall, salt and moisture are usually working behind the surface. Here’s what’s really going on.
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Why your paint won’t stay put
Paint needs a dry, stable surface to bond to. When rising damp carries moisture and hygroscopic salts into the plaster, the surface can no longer hold a finish — paint blisters, bubbles and peels, and the render behind it becomes soft, powdery and “blown.” You’ll often find fallen flakes of paint and plaster gathered along the skirting. Because the salts keep drawing moisture from the air, simply scraping and repainting fails within months. This symptom usually travels with a tide mark and white salt efflorescence, and if it’s left long enough, mould low on the walls.
Why the plaster blows — and how we fix it
Hit play. Watch moisture and salt rise into the plaster zone that blisters your paint, then see a new damp course cut it off so fresh plaster can hold.
The wall starts dry
Press play to watch how ground moisture climbs a solid brick wall — and exactly what a new damp course changes.
What’s breaking down the surface
Blistering paint and blown plaster are surface symptoms of moisture and salt inside the wall — not a painting problem.
Signs of damp-driven paint failure
If two or three of these ring true, the cause is behind the paint, not the paint itself.
Blistering & bubbling
Paint lifting into bubbles low on the wall.
Powdery, soft render
Plaster that crumbles or feels chalky when touched.
Flakes on the floor
Paint and plaster gathering along the skirting board.
Worst near the base
Damage concentrated in the lower metre of the wall.
Comes back after repainting
Fresh paint failing again within months.
Musty edges
A damp smell around the affected patch.
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What Inner West homeowners say about our damp & ventilation work.
“Inner West Rising Damp treated rising damp affecting several lower walls in our Croydon property and everything was handled professionally.”
“Mould problems in one bedroom completely disappeared after the works were completed.”
“The house constantly felt humid downstairs before the ventilation work was done.”
Two problems, two solutions
Blown plaster is a wall-moisture problem — here’s how to be sure which fix you need.
Rising damp treatment
If moisture is wicking up through the walls — tide marks, salt, bubbling plaster — you need a new damp course, not just airflow. We diagnose and install it.
Rising damp treatment →Subfloor ventilation
If the damp air is trapped under the house — musty floors, mould, condensation — you need ventilation to move it out and keep the space dry.
Subfloor ventilation →Bubbling paint FAQs
Why does the paint bubble again after I redo it?
Do you replaster as part of the job?
Could it be condensation instead of rising damp?
How long before I can repaint?
Paint won’t stay on the wall? Let’s find out why
We’ll check whether rising damp is behind it, treat the source and make good the plaster — starting with a free, fixed quote.
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