Bio-aggregate: internal wall insulation, cast to existing masonry, solves the moisture 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. Bio-aggregate  is more than internal wall insulation, it retains thermal inertia increases hygroscopic moisture buffering capacity, reducing the risk of condensation. Quicker, cheaper and better – from cold and damp to warm and dry.



Neighbourhood Construction –  Bio-aggregate training

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.

Peer to peer on site training, structured tuition and open format learning – Neighbourhood Construction


Hemp Lime hygroscopic capacity

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.


40 minutes – everything you need to know about how and why we are casting Bio-aggregate: hemp lime to existing masonry.

50 minutes – Materials module at CAT. MSc Sustainability and Part 2 Architect students

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