The Green Guide for Building Materials is a set of detailed fact sheets for building materials and construction methods that has been assembled, by the BRE, and they are a key part of achieving good ratings under sustainability schemes such as BREEAM and the Code for Sustainable Homes
To the left we can see an extract from the green
guide to "External Wall -Block Work Cavities" and we can see that some
walling systems are better than others A+ or A, so for a higher rating
under an accredited sustainability scheme such as BREEAM, you might opt
for an A+ system.
But how are these Green Guide values decided.
||Each green guide system is put through an assessment
process as described to the left, which a form of LCA.
You can appreciate that a materials which are complex in nature, will have very complicated process trees. The assessment is based on LCA and relates to "functional units" of products such a a square meter of flooring or walling or roofing.
At each stage of the assessment the material impacts are measured and converted to a qualitative value.
|These separate impacts of
the product can be seen to the right.
Climate Change on this walling system does not make an A+, this may be due to the high carbon floor print of elements of the walling system such as the bricks, of concrete blocks.
We note at the bottom of the rating list there is the carbon foot print which is a quantitative value. If we compare this value of 68k g over the deign life of the walling system, compared to a timber frame method which creates 42 kg of C02 per functional unit we can see that although both systems are rated A+ there are still significant differences in carbon footprint.
Handy Links (You will need to Log in to the BRE website)
- Green Guide Ratings
- Green Guide Methodology Document
If you would like to discuss sustainability issues related to you particular project then please pick up the phone or send us and email.