Dear all atal customers
Dear all atal customers,
We would like to draw your attention to the following statement released by the BBA;
“In line with our policy of aligning Certificate wording with industry best practice, the BBA has introduced a new policy for the minimum thickness of membranes intended for use as radon barriers.
British Standard 8485: 2015 + A1: 2019 Code of practice for the design of protective measures for methane and carbon dioxide ground gases for new buildings, suggests that reinforced low density polyethylene membranes (LDPE) for use in gas control applications, should have a minimum ‘effective’ thickness of 0.4 mm i.e. not including the thickness of any reinforcing mesh. This is on the basis that such a product will be sufficiently strong to withstand the installation process and following trades until covered.
Following internal discussions at the BBA we have now reviewed our position on gas membranes and have decided to formally adopt the above thickness recommendation by the BS 8485 drafting panel as a minimum requirement for BBA certification of polyolefin membranes for use in gas control applications, including those certified for the control of radon gas.
The new requirement will apply to all new assessments and existing Certificates will be updated in line with this new policy by the end of September 2020”.
Firstly, we would like to confirm that there is no regulation change with either BRE BR211 or Building Regs. The introduction of a minimum thickness of 400 microns (1600 gauge) from Oct 1st comes as an updated policy of best practise from the BBA. As stated, the change in policy is to ensure the membrane stands up to the rigours of the construction site, as opposed to the products effectiveness as a Gas Barrier. As a reassurance to our customers, the product we have used as a radon barrier has met the policy of best practise (and continues to until October the 1st). The product we currently use, Atal Radbar 300 has been used safe in the knowledge that the product has been independently tested, certified and carries BBA and ISO9001 approval.
We are happy to comply with the updated policy and so we have worked with our suppliers to be able to confirm that an updated Atal Radbar 400 will be a BBA certified membrane ready for 1st Oct.
Please do contact us if you would like anymore information.