Reviving History: Limecrete Flooring and Drainage Solutions
Introduction to the Project
Located just outside Preston, the team has been working on a church restoration project for several weeks. The focus is on installing a limecrete floor, a sustainable alternative to traditional concrete, and improving the building's drainage system. The process involves excavating the floor, laying foamglass, and preparing for the limecrete application.
Preparation and Installation
The preparation phase includes laying a non-woven geotextile and foamglass, followed by another layer of geotextile. The team has also installed a new drainage system to address historic dry rot issues by replacing timber floors with limecrete. This approach aims to lower the water table around the building, ensuring better moisture management.
Mixing and Applying Limecrete
The limecrete mix is prepared using a specialized machine with augers, which speeds up the process compared to traditional methods. The mix includes gravel, sharp sand, Secil NHL5 lime, and synthetic fibers for binding. Achieving the right consistency is crucial to prevent shrinkage cracks, ensuring the limecrete sets properly without excessive moisture.
Leveling and Finishing Techniques
Using a laser level and guiderails, the team ensures the limecrete floor is laid evenly. The process involves compacting the screed, adding layers, and using a eurothane float for a smooth finish. The limecrete is designed to be breathable, allowing moisture to ebb and flow, unlike traditional concrete which traps moisture.
Drainage and Moisture Management
To prevent moisture issues, a land drain system is installed using standard underground pipes instead of flexible ones, ensuring proper leveling. This system helps divert moisture away from the building, acting as a buffer to protect the structure. The team also replaced old gullies with new, roddable ones for easier maintenance.
Final Steps and Considerations
After laying the limecrete, the team plans to use 9mm ply to protect the floor while it dries. The choice of insulation materials is influenced by past dry rot issues, opting for foam instead of natural materials like cork to prevent future problems. The project aims to balance historical preservation with modern sustainability practices.