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#NGS National Green Specification
A Specification for the 21st Century

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Nobody appreciates to be told they failed and then be sent an invoice for the test 

To avoid the risk of an assessment leading to failure NGS preview products and make sure we are confident it will pass before invoicing for the assesment fee.

If it won't pass we decline to assess it, if its borderline we will inform the client, they decide to go ahead or not.

What do we consider in the prePASS assessment?

prePASS assessment Schedule (A02 update)


The assessment is detailed elsewhere

Some products don't make the grade here is an example:

Internal lining system with vapour closed panels made partly of recycled plastics

Many thanks for your enquiry. We have had a close look at the product with a view to its overall environmental impact as well as its contribution towards robust construction.
• The fact that the panel employs 50% recycle is highly laudable - but in terms of overall impact, there is still half of the product generated from new plastic. Acrylic, derived from crude oil (a limited resource) has a lesser impact than PVC (a rival material in this application), but we still feel that, in environmental terms, it doesn't match the benefits of traditional ceramic tiling (derived from an abundant resource). 
• The insulation claims appear to be a little bit far-fetched. In reality there is likely to be little or no significant insulation benefit - though if evidence from using appropriate test methodology were available, the claim could be more adequately tested.
• We had concern about the soundness of the construction as a product of applying the sheeting. Generating a cavity in a wall behind what is effectively a vapour barrier, leads to the risk of moisture ingressing through a solid wall and condensing into the cavity to cause mould  - this would be a particular problem in winter and in cold climates. 
• Another concern was that applying a flexible sheet over a cavity would introduce a degree of flexing which might well induce movement at perimeters and joints. Where joints are horizontal, leakage might be a risk. Very small / nil tolerances are critical in wet areas  and we're not sure they can be obtained consistently when using the sheeting in practice.
In conclusion, though we applaud the effort to reduce plastic waste, we're very sorry to say that this is not a construction material or type that we feel we can endorse.

@ NGS BrianSpecMan aka Brian Murphy
11th September 2013 - 15th December 2013


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Fig. 3 prePASS ASSESSMENT data gathering schedule
(Rev A02 4 new rows added)

@ NGS BrianSpecMan aka Brian Murphy
15th September 2013 - 7th October 2013

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@ NGS BrianSpecMan aka Brian Murphy
11th September 2013 - 18th January 2014