Blistering Paintwork

Understanding the Causes of Blistering Paintwork on a Plastered Wall

Blistering paint on a plastered wall
Blistering paint and other paint issues on plastered walls can be caused by various factors, from moisture to improper surface preparation.

Have you ever noticed those paint issues such as unsightly bubbles forming beneath the paint on your plastered walls? It’s a frustrating sight, especially after putting in the effort to paint them. Blistering paintwork can ruin the aesthetics of your walls and leave you wondering what went wrong.

Understanding What Causes Blistering Paint

Moisture Infiltration

One of the primary reasons for blistering paint is moisture seeping through the plaster. Whether it’s from cracks, leaks, high humidity, or inadequate waterproofing, moisture can wreak havoc on your paint job.

Poor Surface Preparation

Rushing through the surface preparation phase can lead to adhesion issues between the plaster and paint layers. Failure to clean, sand, or prime the surface adequately prevents the paint from bonding securely, resulting in blisters.

Low-Quality Paint or Primer

Using subpar paint or primer products might save you money upfront but could cost you dearly in the long run. Inferior formulations are more prone to blistering, especially when applied to plastered walls.

Paint Application in Extreme Conditions

Painting in extreme temperatures or direct sunlight can impact the paint’s ability to adhere properly to the plaster. Similarly, applying paint to damp surfaces or during high humidity levels can lead to blister formation.

Treating Blistered Paint on Walls

Painting over the Blistered Paint on Walls

While you can paint over blisters, addressing the underlying issues is crucial. Ignoring them may lead to recurring problems. Sand the affected areas, repair any damage, prime the surface, and repaint for a lasting solution.

Preventing Blistering Paint on Plastered Walls

Ensure proper surface preparation by cleaning and priming the walls before painting. Use high-quality paint and primer suitable for plaster surfaces. Additionally, address any moisture issues promptly to safeguard against future blistering.

Quick Fixes for Blistering Paint

Quick fixes such as puncturing the blisters and applying a new coat of paint may offer temporary relief but are not advisable. However, to prevent recurrence, it’s essential to identify and rectify the root cause of the blistering.

Address the issues to prevent blistering paint.

Blistering paint on plastered walls can be a frustrating setback, but understanding its causes is the first step toward effective resolution. By addressing issues such as moisture infiltration from cracks, rising damp, falling damp, penetrating damp, inadequate surface preparation, and using quality materials, you can achieve a flawless finish that stands the test of time. Remember, a well-executed paint job not only enhances the aesthetics of your house but also protects your walls from damage. Take the time to tackle the problem at its source and enjoy walls that exude beauty and durability for years to come.

A Maintenance Home Inspection will help solve many issues you may have in your home with cracking, paint issues and leaks. You get a comprehensive inspection and report with photos which will highlight the maintenance issues you should take care of.

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THE HOME DETECTIVE » penetrating damp

Leaks at Window Sills

Moisture Intrusion at Window Sills

window sills

During many property inspections, I keep coming across moisture problems associated with water leaking into window sills and at windows.

Moisture absorbed into brickwork and plasterwork causes them to expand slightly. When the brickwork and plasterwork dry they contract slightly. The water absorbed by the bricks and plasterwork usually causes a slight vertical crack at the edges of the internal sills. The paint then starts to bubble along the vertical crack. This crack may continue around the length of the window sill before you notice it. What started as a small vertical crack then became a horizontal crack along the bottom of the window sill on the interior face of the wall.

The cracks are usually not significant unless allowed to continue unabated.

Rising Damp

Sometimes the moisture intrusion at sills is mistaken for rising damp! Water leaking in at the window sill may bypass the damp proof course (DPC) built in under the sill as a water-resistant barrier. The moisture may then appear as bubbling paint or crazing cracking of plasterwork, or both, below the window, extending down to floor level.

On external face-brick walls, this may appear as efflorescence (a white powder).

Internally, this may appear as bubbling paint above the skirting or discolouration of the skirting itself.

How do you prevent moisture intrusion into window sills?

Continue reading “Leaks at Window Sills”
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