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RCI March 2018

Project1_Layout 1 07/05/2013 PITCHED ROOFING BS 8612 – changes to dry verge fixing BS 8612 introduced some important changes to dry verge fixing. Stuart Nicholson, director of roof systems at Marley Eternit, discusses the changes and explains why the development of a new Universal Dry verge systems should be quick and easy to install and if fitted correctly, they can provide exceptional security and weather-resistance. However, over recent years, there has been increasing concern that some dry verge systems aren’t being fixed securely. There have also been problems reported of severe staining to gable ends of buildings, with water not draining away from walls due to poorly designed verge units. BS 5534 states that a dry verge can count as one of the two required perimeter mechanical fixings, so it is very important that it can perform this task robustly. Following numerous instances of product failure, in 2017, the National House- Building Council (NHBC) issued new technical guidance on dry verge fixing, in order to reduce the number of warranty claims. The new dry fix standard, BS 8612, has taken this one step further, by bringing in new testing methods to ensure dry verge products meet the required standards of durability and weatherresistance. It also includes a specific test that measures the ability of dry verges to shed water without staining the gable wall. One particular concern the NHBC had about dry verge installations was surrounding the security of batten end fixing. This has been addressed in BS 8612 and the standard includes new requirements for dry verge installation. New dry verge fixing requirements Under the new BS 8612 standard, which came into force on January 31, 2018, dry verge products can no longer be installed just with a nail fixing into the end grain of the batten. Instead, mechanical engagement must be on the faces of the batten. In anticipation of these changes, we have developed a new Universal Batten End Clip to make it easy for contractors to meet these new fixing requirements and ensure the dry verge is fixed securely into the end of the batten. Suitable for use with all dry verge units, the new clip requires no nails and has sharp teeth 092 MARCH 2018 RCIMAG.COM Batten End Clip will make it easier to install compliant dry verges Marley Eternit’s new Batten End Clip has been designed to meet BS 8612 requirements which grip firmly onto the batten, making it extremely secure, as well as being very quick to push or hammer into place. Made from zinc coated aluminium, the c-shaped clip has a robust metal plate for the dry verge to be fixed into, keeping the nail locked into place. The face of the clip contains multiple holes, to make alignment much simpler and quicker. Dry verge innovation We were the first manufacturer to launch an interlocking dry verge system back in the 1980s and our original Dry Verge was a revolutionary product. The introduction of new British Standards, such as BS 8612 and revisions to BS 5534, as well as changes in building practices, mean that we are continually developing our system to meet roofers’ needs. Last year, we carried out some investigations which showed that these days the majority of dry verges end up being fixed with the gutter already in place, which isn’t always in line with manufacturer instructions. So when we re-launched our Dry Verge System last year, we incorporated a new quick starter verge fixing method that can be installed even if the gutter is already in place. This was developed in conjunction with roofing contractors to provide an easy-to-install, robust method of securing the first verge unit – providing visible evidence to housebuilders and the NHBC of a correct and secure fix. The Universal Dry Verge System is also compatible with three major interlocking tile types – large standard, medium format (15” by 9”) and large format thin leading edge, as well as our own clay interlocking pantiles. It has been put through rigorous testing to make sure it meets and exceeds the BS 8612 requirements. Made from a durable form of polypropylene, it has outstanding weather resistance - particularly to freeze/thaw cycles and UV-degradation. It also includes unique drainage features which help correctly channel rain water to prevent gable end staining. The development of our Universal Batten End Clip and Universal Dry Verge System are making it easy for roofers to comply with NHBC, BS 5534 and BS 8612 requirements. www.marleyeternit.co.uk/bs8612 “The development of our Universal Batten End Clip and Universal Dry Verge System are making it easy for roofers to comply with NHBC, BS 5534 and BS 8612 requirements”


RCI March 2018
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