Project features

The project

Limerich undertook the careful retrofit of a pre-1919 granite home in Dundee, Scotland. The aim was to improve energy efficiency, resolve long-standing damp issues, and upgrade thermal performance, without compromising the historic character of the building.

Referred by Tyler Johnston, the project demanded a highly sensitive approach, with every step grounded in conservation best practices and the use of breathable, natural materials.

The project brought together a talented team of traditional craftsmen, including Mathieu from Les Compagnons and Rory from Historic Environment Scotland. Their attention to detail in lime plastering and heritage methods ensured a beautiful, functional result. The team also welcomed Cammy, a multi-skilled tradesman keen to develop his knowledge of lime and conservation work, who brought valuable new energy to the site.

Goals

• Improve thermal performance and air tightness
  
• Address moisture issues in solid wall construction
  
• Preserve the historic fabric of the building
  
• Use natural, sustainable materials throughout
  

Why Sisalwool?

Solid stone walls require insulation that works with the building, not against it. Sisalwool was chosen for its breathability, natural composition, and ability to regulate moisture while delivering exceptional thermal performance. 

Unlike synthetic alternatives, Sisalwool allows vapour to pass through, helping to manage humidity and prevent condensation, critical in heritage properties. It’s also easy to work with, non-toxic, and aligns with the wider use of lime-based building methods.

Benefits

• Breathable insulation for solid wall construction
  
• Excellent thermal performance, improving energy efficiency
  
• Made from natural, sustainable fibres
  
• Non-toxic, easy to handle, and suitable for traditional builds
  
• Complements lime-based and heritage construction techniques

Installation

The team took a strategic approach, starting with the floor, then the ceiling, and finally the walls. All modern post-1919 interventions were removed to return the house to its original form.

For wall insulation, bare granite was lime-parged to enhance air tightness without sealing moisture in. Sisalwool was then friction-fitted between joists and timber studs, providing a vapour-open layer that worked in harmony with the breathable construction. To complete the system, compressed wood fibre boards were installed over the Sisalwool for added insulation and finish.