For this first step of the project (CobBauge 1), the expected deliverables and output are the following:

WP3 – Cob mixes formulation and evaluation

Leader: ESITC Caen

Deliverables

Activity 3.1. 20 formulations of cob mixes

12 types of soils and 6 types of natural fibres from UK and France will be used. These 20 formulations will allow a differentiation of the key aspects of cob.

Activity 3.2. 4 optimised cob mixes (2 in UK and 2 in France) will be selected from the 20 mixes tested according to their mechanical, structural, moisture, thermal and acoustic performances. This selection will comply with both French and British legislative criteria.
Activity 3.3. 1 innovative mixing and building method

This method will be selected according to builder’s opinion and economical and environmental costs. A comparison between concrete, actual cob and innovative cob will be made to assure the competitiveness of the innovative cob mix.

Activity 3.4. 4 medium scale cob manufacturing

The 4 optimised cob mixes will be manufactured at larger scale to ensure that the innovative method associated to these cob mixes are suitable indoor and outdoor. Their performances will be tested in climate rooms and will demonstrate the feasibility of innovative cob house and the reliable characteristics of the designed innovative cob products.

Outputs

4 optimised cob mixes designed
From the 20 innovative mixes, 4 optimised cob mixes will be designed from local soils and natural fibres. Their enhanced properties in terms of mechanical and thermal performances and comfort will allow them to comply with actual regulation and a take up of earth construction.

4 optimised cob mixes produced
The 4 optimised cob mixes previously designed will be produced from materials selected based on availability and location of buildings to be constructed in order to minimise CO2 production due to the material transportation. The innovative manufacturing method will be used to allow a reduced time of labour compared to traditional method of cob building.

WP4 – The specification of demand and mobilisation of a professional network

Leader: PnrMCB

Deliverables

Activity 4.1. A comprehensive network directory

A directory accessible to members of the network via the project website that will firstly identify the stakeholders in the building sector, cob and earth generally, those interested in the issues of reducing CO2 emissions in the construction, and secondly recent cob buildings with information on the construction mode, site organization and the environmental impacts.

Activity 4.2. A report on the target audiences’ receptivity to the CobBauge construction process

This report will be based on statistical studies from future owners and private and public investors. An economic study will make it possible to specify the impact of the new process on the costs of cob walls. The statistical data from the surveys will make it possible to understand the development potential of the process more precisely and to define the actions to be implemented in order to achieve the obejctives.

Activity 4.3. List of recommendations for the development of CobBauge 2

A report of recommendations will be drafted based on 6 worshops and 2 general meetings, as well as barriers identified at the beginning of the project, improvement in product and process performance and the results of the demand study. The report will detail an action plan to be undertaken in a second stage of the project (CobBauge 2) by the project partners and members of the network.

Outputs

Set up of a network
The partners will implement a shared network of professionals related to earth construction. Workshops will be held in Brittany, Normandy, Hauts-de-France, Somerset, Devon, Cornwall to establish and measure demand for the CobBauge product and process, raise interest and share the activities of current and potential members and users.

Inventory and mapping
An inventory of existing contemporary cob and CobBauge buildings will be implemented to analyse the CobBauge development and measure the efficiency of the project. Locational extracts of elements of this database will feed an online map.

Survey to assess the demand
Surveys will be conducted to identify and quantify the demand for a new CobBauge product and process. Based on a virtual demonstration project and an economic study evaluating its impact on the building costs, a statistical survey of the network will be carried out to clarify the potential of the cob market and to make recommendations accordingly for a programme of adapted actions.