Adam and Hayley – 1 minute

Peer to peer on-site training

Apprenticing Adam and Hayley, hosted by Ian and Simon.

What: Materials – Formulated lime plaster.

How: Methodology – Trowel applied, spread, measured and quantified.

Why: Objectives – Lambda value, u-value and moisture regulation.

Research: Beacon Project – Institute of Biological Environmental Rural Sciences (IBERS).

Advice and support: Peer to peer on-site training – Brief-Design-Programme-Schedule-Team.


Formulated lime plaster


Apprenticing Abi and Eva, hosted by Simon and Soren.

Base-coat – Baumit RK38. Top-coat – Baumit Kalkin Glätt W. Mesh – AG01

Hygroscopic Limestone aggregate.

The use of a proprietary product has been essential in the development of the Neighbourhood Construction internal-wall-insulation system. These plaster products were originally specified for use with the BBA certification held by Lime Technology for the construction of new-build Hemcrete dwellings.

The manufacturer describes a 35kg sack of basecoat to cover 2.4m2 at a thickness 10mm. However, when trowel applied to a cast ‘true’ Bio-aggregate wall a 35kg sack of basecoat covers 4.8m2 at a thickness of 5mm. The Manufacturer describes a 20kg sack of topcoat to cover 20m2 at a thickness of 1mm. However, a high level of practice and proficiency is required to achieve this, more commonly a 20kg sack of topcoat covers 16m2 at a thickness of 1.25mm.

Overall the required plaster thickness is halved improving the thermal performance of the system. Using less plaster reduces material and labour cost as well as carbon input.

Baumit RK38 – product data sheet

Baumit Kalkin Glätt W – product data sheet


Trowel applied – spread, measured and quantified.

Baumit RK38 – Basecoat lime plaster – 35kg
– 35kg sack
– Covers  4.8m2
– Thickness 5mm
– Water 12 litres per sack
7.29 kg per m2
2.5 litres per m2

Baumit Kalkin Glätt W – Topcoat Lime Plaster – 20kg
– 20kg sack
– Covers 16m2
– Thickness 1.25mm
– Water 10 litres per sack
1.25 kg per m2
0.625 litres per m2

The system – Plaster, is part of the Neighbourhood Construction framework undertaken in conjunction with the systems – Bio-aggregate and Paper and Paint.

During the preconstruction phase, an audit of the existing property is undertaken with advice and support with achieving other no-cost and low-cost projects within the NC framework.

The Process is open source – analytics are collected on in-situ performance as well as delivery costs to inform future works with up to date costings and performance analysis. This delivers affordable best practice and facilitates real-world academic research opportunities.


Lambda value, u-value and moisture regulation.


The plaster system is applied to the Bio-aggregate system and finished with the Paper and Paint system.


Beacon Project – Institute of Biological Environmental Rural Sciences (IBERS).


Advice and support

Peer to peer on-site training.




We’ll be working alongside experienced practitioners, learning how to design and plan, as well as the practical delivery.

We’ll consider the underlying objectives of the installation within the broader context of energy and moisture in the home.

We’ll look at the preparations that are required to the walls and how these affect the quality and speed of the installation.

We’ll be mixing and applying both coarse base-coat and fine top-coat lime plaster, accurately calculate and measuring the mix for the areas required.

We’ll learn how to apply efficiently move with a little system thinking and team building.

Lunch will be provided.

The content will be covered on days one and two, day three is optional providing an opportunity to practice, demonstrate and re-visit aspects of importance to you.

> Paper and Paint