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White Powder on Walls – What Causes It?
White powder appearing on walls is often a sign that moisture is moving through masonry and leaving mineral deposits behind. These deposits are commonly referred to as salts or efflorescence.
As moisture travels through brickwork or plaster, it dissolves natural salts within the building materials. When the moisture evaporates from the wall surface, the salts remain behind as a white powder.
Although this may appear harmless at first, salt deposits can sometimes indicate underlying damp problems within the wall.
What Is the White Powder on Walls?
The white powder seen on walls is typically made up of mineral salts carried through the wall by moisture. These salts crystallise on the surface when the water evaporates.
Efflorescence often appears as a chalky white residue on plaster, brickwork or painted surfaces.
Salt Deposits Caused by Rising Damp
Rising damp can carry salts from the ground upward through masonry walls. As the moisture evaporates from plaster surfaces, these salts can form visible deposits.
Over time, salt contamination can damage plaster finishes and lead to further deterioration of wall surfaces.
Other Causes of Salt Deposits on Walls
Although rising damp is a common cause of salt deposits, white powder may also appear due to penetrating damp or moisture entering walls through building defects.
Newly constructed walls can also develop temporary efflorescence as construction moisture dries out.
White Powder on Internal Walls
White powder appearing on internal plaster walls may indicate that moisture is travelling through the wall structure and leaving salt deposits behind.
White Powder Near Skirting Boards
Salt deposits forming near the base of walls may indicate moisture rising through masonry & timber from the ground.
White Powder on Brick Walls
Efflorescence can also appear on exposed brickwork where moisture within the masonry evaporates and leaves mineral salts on the surface.
When Salt Deposits Should Be Investigated
If white powder continues to reappear after cleaning or is accompanied by damp patches, mould growth or plaster damage, it may indicate an underlying damp problem.
A professional damp survey can identify whether rising damp, penetrating damp or other moisture issues are responsible.
Book a Damp Survey for Salt Deposits
If you are noticing white powder or salt deposits on walls in your home, Dampline provides professional damp surveys across Durham and surrounding areas.
Our damp surveys identify the source of moisture problems so the correct solution can be recommended.
Book a damp survey today to investigate damp and salt contamination affecting your property.