Demolition material can be integrated with a future works programme or at least be considered for use in other building projects. A walkthrough example is provided for the Pre-demolition Audit (211 kb) , the audit forming an important part of the overall project management process. It does so by identifying resources which can be recovered for future use rather than being lost to landfill.
The walkthrough example takes the user through the detailed steps which allow the following to be established:
Information on the above is now provided in summary form below.
It should be noted that the HSE, Training & Risk Assessment (61 kb) document provides information on how health & safety, training and awareness of contractors will also influence the resource recovery operations associated with demolition.
Resource Recovery Methodologies
In terms of resource efficiency the ICE Demolition Protocol is a key driver for more effective demolition methodologies. It allows a linkage to be made between the new build and demolition stages of developments, providing supply and demand mechanisms for demolition material recovery and the procurement of recovered materials.
Detailed requirements may be set in a variety of ways for demolition good practice, for example, through planning conditions and tender & contract clauses. Examples of tender and contract clauses can be found in the Procurement Module.
The National Green Specification (NGS) has prepared a number of specification clauses to support the delivery of best practice.
Demolition Bill of Quantities (D-BOQ)
The D-BOQ allows the following to be determined:
The DRI and DRMP allow the potential for recovering material from a building to be expressed in terms of a percentage and tonnage, respectively. A target is then set for recovering demolition material based on the following:
This will then inform the preferred approach to material segregation and result in an assessment of the site layout to manage segregated material streams. The Demolition Recovered Material Target (DRMT) can then be established.
As mentioned at the top of the page, the Pre-demolition Audit walkthrough example describes the steps required to produce the DRI & DRMP and DRMT. A template is also provided here illustrating the headings to be used for the D-BOQ.
Resource Recovery Plan
Managing Contamination: Two types of contamination should be identified with a view to potential impacts on resource recovery potential:
The Historical Building Use and Chemical Contaminants table in the ICE Demolition Protocol allows an assessment to be made of the contamination risks posed by different types of buildings. If there are potential contaminants associated with the building, use of the risk assessment flow charts in the Protocol facilitates the process of determining where to segregate contaminated from uncontaminated material.
Cost Benefit Analysis: The segregation of demolition materials can take place once a simple cost benefit analysis has been carried out to assess the level of segregation which makes economic sense.A cost benefit analysis template is provided in the walkthrough example mentioned at the top of the page. Completion of this will allow effective resource management practices (with clear financial benefits) to be identified. This could be achieved, for example, through approaches to soft-strip, segregation and recycling.
A number of pressures influence how material can be managed:
The soft strip methodology should strive to maximise the potential of materials, first for reuse, and secondly for recycling. The materials removed to allow access to concrete and masonry will often have value and should be assessed as such.