Concrete blockwork – bubbling or blistering of paint

Causes

Loss of adhesion due to excess moisture in substrate

Poor initial substrate preparation

Oil-based (alkyd) paint applied over water-based (latex) paint

Surface was damp or dirty when painted previously

Dark colours increasing surface temperatures

Water-based paint coat exposed to moisture before paint has fully dried

Listed under: Exterior, finishes, concrete and cement, concrete blocks, paint, cladding, walls, moisture, wall cladding, solid concrete blockwork

Cause

Loss of adhesion due to excess moisture in substrate

Repair

  • scrape and/or sand off loose paint to leave a clean, sound surface. Allow to dry out thoroughly. Prime; paint with a minimum two coats of paint suitable for concrete masonry

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Cause

Poor initial substrate preparation

Repair

  • scrape and/or sand off loose paint to leave a clean, sound surface. Allow to dry out thoroughly. Prime; paint with a minimum two coats of paint suitable for concrete masonry

Back to top

Cause

Oil-based (alkyd) paint applied over water-based (latex) paint

Repair

  • scrape and/or sand off loose paint to leave a clean, sound surface. Allow to dry out thoroughly. Prime; paint with a minimum two coats of paint suitable for concrete masonry

Back to top

Cause

Surface was damp or dirty when painted previously

Repair

  • scrape and/or sand off loose paint to leave a clean, sound surface. Allow to dry out thoroughly. Prime; paint with a minimum two coats of paint suitable for concrete masonry

Back to top

Cause

Dark colours increasing surface temperatures

Repair

  • scrape and/or sand off loose paint to leave a clean, sound surface. Allow to dry out thoroughly. Prime; paint with a minimum two coats of paint suitable for concrete masonry

Back to top

Cause

Water-based paint coat exposed to moisture before paint has fully dried

Repair

  • scrape and/or sand off loose paint to leave a clean, sound surface. Allow to dry out thoroughly. Prime; paint with a minimum two coats of paint suitable for concrete masonry

Back to top