Renovation & EWI Project

1960s Detached House, Leeds

Job Description

External wall insulation and render system

Work started in September 2023, and was completed in early October 2023.

The client contacted THIAS in Spring 2023 and requested a whole house healthy homes survey, including a retrofit survey. They were concerned about heat loss and rising energy bills due to the front and rear walls not fully insulated behind a large, tiled area.

A detailed survey and assessment was carried out at the property highlighting areas of significant heat loss.

The property needed significant upgrading and modernisation to make it warmer and more comfortable for the future.

The survey and report provided by Retrofit Projects allowed the client to fully appreciate the extent of the work required – and the expected costs and duration of the project.

Jobs Completed

Stage 1: Fixing Rockwool insulation slabs to the external walls

The work was undertaken in September 2023: the old hanging tiles were removed and the solid walls exposed.

Two new A-rated PVCu windows were installed to ensure that the new insulation would fit perfectly with the external window reveals (the windows needed replacing in any case).

The external walls were solid block and had no cavity. External wall insulation was the only solution and the best option being 100 mm Rockwool – which was fully bonded and mechanically fixed.

Stage 2

The insulation was covered with a thin coat backing render, and mesh membrane embedded in the first coat – with extra membrane inserted in key locations to avoid possible stress cracking. 

Two coats of backing render were applied, the finish gave a flat even surface.

The final part of the system is a coloured silicone render system, done in stages over several days.

Working with the clients and with a team of expert contractors, we were able to complete the project within the expected timescales.

All work undertaken is covered by a full guarantee on both labour and materials.

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