Bristol Hemp & Lime

Hemp Lime hygroscopic capacity

Hemp and Lime, hygrothermal passive heat recovery,  solves damp problems with the secondary effect of improving the thermal efficiency of older buildings. The principles and materials used in traditional architectural detailing prevent degradation whilst regulating temperature and humidity by capturing and recycle 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, humidity and incorrectly installed causes interstitial condensation. Hemp & Lime is more than internal wall insulation, it retains thermal inertia increases hygroscopic capacity and prevents condensation. From cold and damp to warm and dry.

Hemp lime training is more than a practical ‘how to’ demonstration, it builds a level of theoretical understanding, how to mitigate damp problems and the benefits of the traditional hygrothermal envelope. The vapour gradient model is falling short and how hygrothermal passive heat recovery corrects the model. The process covers the fundamentals of building principles, teaches how to design beyond aesthetic as well as project planning and team building. It must be recognised that proceeding with internally applied Hemp and Lime is participating in a research case study.


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

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

Emancipated kitchen
The open plan kitchen, reeking 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 the storms by tackling more manageable project in isolation.


For talks and workshops see…

Peer to peer on site training, structured tuition and open format learning.

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