External Wall Insulation

EWI installation usually takes 7-10 days. Here's a general overview of the process:

Step 1. Preparation for External Wall Insulation

Before installation, the existing wall surface must be:

• Inspected and repaired as needed.
• Clean, dry, and free from dust or contaminants that may affect adhesion.
• Primed appropriately if required by the system specifications.

Step 2. Insulation Installation

Insulation boards are fixed using one of two methods:

• Dry Fix System: Boards are secured directly to the wall with mechanical fixings.
• Wet Fix System: Adhesive is applied to the wall before installing the boards, followed by mechanical fixings for reinforcement.

Step 3. Beading Installation

To reinforce the façade, various beading elements are applied using a reinforcing basecoat, including:

• Corner beads for structural strength.
• Base beads for clean, level finishes.
• Movement beads to accommodate thermal expansion.

Step 4. Reinforcing Basecoat

A reinforcing basecoat is mixed on-site and trowel-applied over the insulation boards to approximately 6mm thickness. A fiberglass mesh is embedded into the basecoat, with:

• 100mm overlaps between mesh strips for structural integrity.
• Additional patches applied at corners and stress points.

Step 5. The Final Finish

Once the reinforcing basecoat has fully dried (typically up to 72 hours), the surface is prepared for the chosen finish. Options include:

• Thin coat render (with a primer).
• Additional render coat for a textured, dashed, or brick/stone effect.
• Thick coat render for a traditional look.
• Adhesive layer for installing brick slips.

Each finish provides a durable, weather-resistant, and visually appealing exterior, enhancing both thermal efficiency and aesthetic appeal.

Planning and Building Regulations

If your property is listed or located in a conservation area, you may require Planning Permission before installing External Wall Insulation (EWI). Please note that securing planning consent is the homeowner’s responsibility. We recommend consulting your local planning office for guidance before work begins.

Ventilation Upgrades

To comply with Building Regulations Part F & L, ventilation must be upgraded when installing EWI. This includes:

• Background Ventilation & Trickle Vents in most rooms to allow natural air circulation.
• Mechanical Ventilation in moisture-prone areas such as kitchens, bathrooms, and wet rooms to prevent condensation and damp issues.

Maintenance and Upkeep

EWI is a low-maintenance system designed for long-term durability. However, to maintain its appearance and performance, we recommend following these guidelines:

• Gutters and drains should be kept clear to prevent water damage.
• Air vents must remain unobstructed to ensure proper ventilation.
• Silicone and mastic seals around pipes and external fittings should be regularly checked and maintained to prevent water ingress.

Fixing Items to Your Walls

If you plan to install satellite dishes, gate posts, hanging baskets, or other fixtures after EWI installation, follow these precautions:

• Use appropriate fixings that are long enough to anchor into the original wall, not just the insulation system.
• Avoid compressing the insulation, as this can affect performance and stability.
• Percussion drilling is not recommended due to the risk of damaging the embedded mesh layer. Instead, use a diamond-tipped drill bit.
• Apply mastic sealant around fixings to prevent water penetration.
• If applicable, seek approval from your Housing Association before installation.

Cleaning and Surface Care

Over time, natural weathering may cause dirt buildup or algae growth on the external render. To clean your walls effectively:

• Use CL150 masonry wash, applying it with a brush or sprayer.
• Allow 48 hours for the solution to take effect and kill any algae.
• Rinse with a low-pressure washer using a fanned water jet, avoiding excessive force on exposed edges.
• In areas with high algae spores, repeat the process every few years to maintain aesthetics.

Warranties and Guarantees

• Product Warranty: 10 years
• Workmanship Guarantee: 1 year
• Insurance-Backed Guarantee (where applicable)
• System Warranty: 10-25 years, depending on manufacturer specifications.