Where’s the job?

Overview

• Fitting external solid wall insulation systems involves applying insulation boards to the external façade to improve energy efficiency.

• Skill level: 3 / 5 (good preparation and attention to detail are key, especially when matching finishes).

• Typical duration: 2 – 4 days depending on wall size, surface condition and system complexity.

Safety First

• Always erect safe scaffolding or use a stable platform when working at height.

• Wear appropriate PPE: helmet, gloves, eye protection and non-slip footwear are essential.

• Check for overhead or nearby obstructions that could pose a risk during installation.

• Ensure ladders or access equipment are secure and in good condition.

Tools & Materials

Step-by-Step

1. Prepare the wall – clear debris, check for loose render and ensure a stable substrate.

2. Apply a bonding agent or primer to improve adhesion of insulation boards.

3. Fix insulation boards with adhesive and supplementary mechanical fixings, ensuring even spacing and alignment.

4. Seal joints and edges with mesh tape and suitable filler to prevent thermal bridging.

5. Apply a base coat render over the insulation, followed by a finishing coat for durability and aesthetics.

6. Allow sufficient curing time before exposing the wall to weather.

Completion Checks

• Ensure insulation boards are uniformly fixed with no loose sections or gaps.

• Check render finish for even curing and no visible cracks or defects.

• Verify that all joints are sealed to maintain thermal efficiency and weather resistance.

• Final inspection of fixings and render should meet local building regulations.

When to Call a Pro Instead

If the project involves complex façade geometries, heritage properties or requires planning consent, it is wise to engage a qualified contractor to ensure compliance with building regulations and warranty conditions.