Can You Fix a Blown Render?

Render is a popular choice for exterior walls, offering a sleek, durable finish that enhances the appearance and protection of a building. But with time, the render may deteriorate and blow due to things like moisture, structural movement, and improper application. If you’ve noticed cracked, loose, or crumbling areas, you might be wondering—can you fix a blown render? The good news is, yes, you can. Here’s how.

Causes of Render Blowing

Blown render occurs when the bond between the render and the wall weakens, leading to cracking, bulging, or detachment. Several factors can contribute to this issue:

Moisture Ingress: Water penetration is a major cause of damaged render. If water seeps behind the render and freezes, it expands, leading to cracks and separation.
Poor Application: If the render was applied incorrectly—too thick, too thin, or without proper bonding—it may fail prematurely.
Structural Movement: Subsidence, vibrations, or general movement in the building can cause the render to crack and detach from the surface.
Weathering: Extreme heat, frost, and persistent rain can degrade cement render over time, leading to damage.

Repair Options for Render

The degree of damage determines whether a blown render may be fixed. The most popular repair techniques are as follows:

1. Patch Repairs

For minor cracks and small damaged areas, patching is a simple and cost-effective solution. This involves:
Removing the loose or damaged render.Cleaning the underlying surface.
Applying new cement render to blend with the existing render.

2. Full Render Replacement

If large areas of the render are blown, a whole replacement might be necessary. This process involves deleting the previous render and adding a freshly created layer in order to preserve longevity.

3. Crack Repairs and Sealing

Specialized fillers and sealants can be used to small cracks that haven’t completely separated to stop additional damage and preserve the wall’s look.

Steps to Repair the Blown Render

Here are the essential stages for fixing a broken render, whether you’re thinking about doing it yourself or hiring a pro:

Step 1: Assess the Damage

Check out the blown render’s extent. If a hollow sound is produced when you tap the surface, that section has detached and needs to be fixed.

Step 2: Remove the Damaged Render

Using a hammer and chisel or another appropriate tool, carefully remove the loose render, taking care not to damage the solid portions.

Step 3: Prepare the Surface

Dust and debris should be brushed away. Before continuing, let the area thoroughly dry out if moisture is a problem. Adhesion can be enhanced by applying a bonding agent.

Step 4: Apply the New Render

Mix a suitable cement render and apply it in layers, ensuring proper bonding with the existing render. Smooth and level it to match the surrounding surface.

Step 5: Cure and Finish

As directed by the manufacturer, let the render cure completely. For further protection, you can paint or seal the surface after it has dried.

Professional Render Repair in Sydney

While minor patch repairs may be possible on your own, extensive render damage requires professional attention. Inadequate repairs could result in ongoing problems and increased costs over time. Zaks Render offers top-notch solutions to restore and improve your walls if you require skilled render repair services in Sydney. For dependable and durable render repairs, get in touch with their staff.