Bristol Hemp and Lime

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Hemp Lime hygroscopic capacity

Bio-aggregate: hemp-lime, resolves moisture issues whilst also having the beneficial effect of improving the thermal efficiency of older buildings. The principles and materials used in traditional construction methodology prevent degradation whilst regulating temperature and humidity by capturing energy from moisture.

Improved loft insulation and double glazing make walls the coldest surface in the room, increasing the risk of condensation. External insulation is costly, complex, unsympathetic and retrofitting leave cold spots internally. Walls insulated internally with foam board lose the capacity to buffer temperature and humidity causing interstitial condensation. Bio-aggregate: hemp-lime is more than wall insulation reducing heat transfer through a wall, it also improves air tightness, has more accessible thermal inertia, and an increased surface temperature to improve thermal comfort. Retrofitting from cold and damp to warm and dry.


Case Studies

The following case studies document early prototyping of the process.

Victorian terrace
The damp Victorian terrace, built on a budget, what went wrong and what made it worse? How a century of bad practice put right in a couple of weekends.

Hygroscopic bathroom
The steamy Hygroscopic bathroom, more than breathable, capacity counts, rapidly responding in layers, the wallpaper’s not for decoration.

Emancipated kitchen
The open plan Emancipated kitchen, wreaking havoc in every home, enter the Bi-folding doors and the reveals expose a concentration of moisture.

Cold spots
Every home has Cold spots under repeated attacked from internal weather, reduce storms and tackling more manageable project in isolation.

Hemp Lime process
Preparation, mixing, casting and results.

Talks and workshops
Hemp Lime training
Renovation, conservation and new build construction. Preparation, mixing and casting onto existing masonry, infilling traditional timber frames and solid wall monolith construction.

Advice and consultancy
Damp pathology, building principles, design critique, project planning and team building.


Bristol Hemp and Lime
Hygrothermal passive heat recovery, solves damp problems with the secondary effect of improving the thermal efficiency of older buildings.

Further information…