External Wall Insulation Chislehurst – Completed Project
Project confirmation: This page documents a completed external wall insulation project carried out by our team on a semi-detached family property in Chislehurst. For full service details, specifications and borough-wide coverage, visit our External Wall Insulation in Chislehurst page.
This project involved full EPS insulation board installation, mechanical fixing, reinforced mesh basecoat and a breathable silicone render finish. Below you can see each stage of the installation process from preparation through to completion.
This completed external wall insulation project in Chislehurst demonstrates our full installation process, from insulation board fixing to reinforced basecoat and silicone render finish. For full service details and local coverage information, visit our External Wall Insulation in Chislehurst service page.
Thank you Ed.
kind regards FC
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Considering external wall insulation for a similar property in Chislehurst? You can find full details about our installation methods, insulation systems and silicone render finishes on our External Wall Insulation in Chislehurst service page.
Project Summary
External Wall Insulation Chislehurst was installed on this pre 1930s residential property, improving thermal efficiency while refreshing the home’s external appearance.
Project Overview
- Location: Chislehurst and surrounding areas including North Cray, New Eltham, Mottingham and Avery Hill
- Service Provided: External Wall Insulation (EWI)
- Insulation System: Expanded Polystyrene (EPS) chemically bonded and mechanically fixed
- Property Type: Semi-detached residential house
- Construction Period: Pre-1930 solid wall construction
- Wall Build-Up: Traditional solid masonry walls (no cavity)
- Pre-Installation Condition: Weathered and deteriorating roughcast render with visible cracking and surface degradation
- Performance Issues Identified: Cold internal wall surfaces, localised damp staining, surface condensation and poor thermal retention
- Project Objective: Upgrade thermal efficiency, reduce condensation risk and deliver a durable modern external finish
- Final Finish: 1.5mm smooth silicone render system
Technical Details
- External Wall Insulation System: EWIPRO certified EWI system
- Insulation Material: Expanded Polystyrene (EPS)
- Insulation Thickness: 90mm EPS boards selected to suit existing solid wall construction and achieve meaningful thermal improvement
- Fixing Method: Chemically bonded using proprietary adhesive and mechanically fixed to solid masonry substrate
- Mechanical Fixings: 8mm diameter, 135mm length, metal pin hammer-set fixings
- Reinforcement Layer: Polymer-modified basecoat with embedded alkali-resistant fibreglass mesh to enhance impact resistance and minimise cracking risk
- Finish Coat: 1.5mm grain silicone render
- Colour: Pure White
- Performance Characteristics: Vapour-permeable, water-repellent façade finish designed for long-term durability in UK weather conditions
- Detailing: Careful treatment to all openings, corners and junctions including installation of powder-coated aluminium window oversills (1.2mm thick, 150mm depth) to extend beyond the new insulation line and maintain effective drip protection
- Outcome: This External Wall Insulation Chislehurst project delivered enhanced thermal performance, reduced internal cold bridging and condensation risk, and a clean, contemporary external finish
Outcome & Benefits – External Wall Insulation Chislehurst
- Significant improvement in thermal performance by insulating previously unprotected solid masonry walls and reducing heat loss through the building envelope
- Warmer internal wall surfaces resulting in improved day-to-day comfort for occupants
- More stable internal temperatures throughout the property
- Reduced reliance on space heating due to enhanced insulation performance
- Lower risk of surface condensation associated with cold solid wall construction
- Complete external transformation, replacing deteriorated roughcast with a modern silicone render finish
- Consistent high-quality detailing across all elevations, including window reveals, corners and junctions
- Durable, breathable and weather-resistant silicone render designed for UK climate conditions
- Improved resistance to moisture penetration and external weathering
- Reduced risk of cracking through reinforced basecoat and correct system installation
- Lower ongoing maintenance compared to traditional painted or roughcast finishes
- Added protective insulation layer helping preserve the building fabric of this pre-1930 solid wall property
- Overall improvement in energy efficiency, potentially supporting stronger EPC performance
Related Rendering & Insulation Services in Chislehurst
| External Wall Insulation | External Rendering |
| Self-Cleaning Render | Silicone Render |
| Sand and Cement Render | Lime Render |
| Cork Render | Monocouche Render |
| Acrylic Render | Insulated Render |
| Plastering (Internal Skimming) | Brick Slips |
| Ashlar Cut Effect Render | Colour Render |
Other Nearby External Wall Insulation Projects
| Bickley | West Wickham |
| Beckenham | Orpington |
| Sidcup | New Eltham |
| Bromley | Eltham |
| Mottingham | Petts Wood |
| Avery Hill | Sundridge |
After photo of the completed External Wall Insulation Chislehurst project, captured from an alternative left-hand angle. The image highlights the smooth 1.5mm silicone render finish, precise detailing around openings and the overall transformation of the property façade.
Before: Pre-1930 solid wall residential property in Chislehurst prior to our External Wall Insulation Chislehurst installation, showing aged and deteriorating roughcast render.
External Wall Insulation – Chislehurst – Frequently Asked Questions
Is this a real External Wall Insulation Chislehurst project?
Yes. This page documents a genuine External Wall Insulation Chislehurst project completed by our team on a residential property. The photos show real before, during and after stages of the installation carried out on site.
What type of property is shown in this External Wall Insulation Chislehurst case study?
This External Wall Insulation Chislehurst project was completed on a pre-1930 solid wall semi-detached home. Solid masonry walls (no cavity) are a common reason homeowners consider external wall insulation.
What issues were identified before starting External Wall Insulation Chislehurst works?
Before the External Wall Insulation Chislehurst installation, the property showed aged and deteriorating roughcast render, along with typical solid-wall symptoms such as cold internal wall surfaces and a higher risk of surface condensation.
Why is external wall insulation suitable for pre-1930 solid wall houses in Chislehurst?
Pre-1930 solid wall properties have no cavity insulation, so heat loss can be higher compared with modern cavity wall homes. External Wall Insulation Chislehurst adds a continuous insulation layer externally, helping to reduce heat loss and protect the original wall structure.
What insulation material was used on this External Wall Insulation Chislehurst project?
This External Wall Insulation Chislehurst project used expanded polystyrene (EPS) insulation boards as part of a complete EWI system. EPS is commonly used for residential EWI due to its proven performance when installed and detailed correctly.
What insulation thickness was installed for this External Wall Insulation Chislehurst project?
90mm EPS insulation boards were installed on this External Wall Insulation Chislehurst project to achieve a meaningful thermal upgrade while keeping external detailing (openings, roof lines and boundaries) practical and neat.
How were the insulation boards fixed to the wall?
For this External Wall Insulation Chislehurst installation, the EPS boards were chemically bonded using adhesive and then mechanically fixed to the solid masonry substrate for secure long-term performance.
What mechanical fixings were used on this External Wall Insulation Chislehurst job?
This External Wall Insulation Chislehurst project used 8mm diameter, 135mm long, metal pin hammer-set fixings (installed to suit the substrate and the system specification).
Was reinforcement mesh used, and why is it important?
Yes. This External Wall Insulation Chislehurst project included a reinforced basecoat with alkali-resistant fibreglass mesh embedded. Mesh reinforcement improves impact resistance and helps reduce the likelihood of cracking in the render system.
What are “stress patches” and were they used around windows?
Stress patches are diagonal mesh reinforcements applied at window and door corners—common stress points where cracking can occur. On this External Wall Insulation Chislehurst project, stress patches were installed to strengthen these vulnerable areas.
What render finish was applied on this External Wall Insulation Chislehurst project?
The final finish for this External Wall Insulation Chislehurst case study was a smooth 1.5mm grain silicone render. Silicone render is valued for its durability, weather resistance and clean modern appearance.
What colour render was chosen for this project?
This External Wall Insulation Chislehurst project was finished in Pure White silicone render, creating a bright, crisp façade and a consistent finish across elevations and details.
How were window sills handled after installing 90mm insulation?
Because External Wall Insulation Chislehurst increases the wall build-up, powder-coated aluminium window oversills were installed to extend beyond the new insulation line and maintain effective drip protection. Oversills used were 1.2mm thick and 150mm deep.
Will External Wall Insulation Chislehurst change the look of the property?
Yes—in a positive way. This External Wall Insulation Chislehurst project replaced a tired, deteriorated roughcast finish with a clean, modern silicone render, improving both appearance and façade protection.
Does External Wall Insulation Chislehurst help with condensation and damp?
External wall insulation can help reduce condensation caused by cold internal wall surfaces by making walls warmer. Any existing damp issues should still be diagnosed properly, and correct detailing (sills, junctions, sealants and drainage) is essential.
How long does an External Wall Insulation Chislehurst project usually take?
Timescales depend on access, weather, detailing and overall size/complexity. Most residential External Wall Insulation Chislehurst projects are completed in staged phases (insulation, basecoat/mesh, finish coat), with drying times and weather conditions influencing progress.
How should silicone render be maintained after External Wall Insulation Chislehurst installation?
Silicone render is generally low maintenance. Occasional gentle cleaning and keeping gutters/overflow points working properly helps protect the façade. Avoid aggressive pressure washing, and address any local damage promptly to maintain long-term performance.
Trusted External Wall Insulation Systems in the UK
EWI Pro – System used on this External Wall Insulation Chislehurst project
EWI Pro supplied the certified external wall insulation system used on this External Wall Insulation Chislehurst project
K Rend
K Rend is known for silicone and monocouche render finishes used with insulation systems.
Weber
Weber provides external wall insulation systems and render finishes widely used in the UK.
Parex
Parex offers rendering and insulation system components for a range of applications.
Wetherby Building Systems
Wetherby Building Systems supplies EWI solutions for solid wall and frame construction.
Alsecco
Alsecco provides German-engineered EWI systems designed to meet UK requirements.
Baumit
Baumit supplies external wall insulation systems with strong weather resistance performance.
Johnstone’s Trade
Johnstone’s Trade manufactures Stormshield render and insulation systems.
Permarock
Permarock supplies external wall insulation systems used across residential and commercial projects.
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