In these cases, it is now recommended to consult with the local planning authority or an appropriate conservation organisation. Baby ridge and hip tiles Roofing contractors should also take note of some new advice for fixing baby ridge and hip tiles.
Graded battens should also go through a series of checks, ensuring that knot-configurations and other issues meet the requirement of the standard. Most of these offer guidance but are not a requirement of the standard. When tiles are being installed which are not suitable for a mechanical fixing, then they will need to be drilled and fixed.
Because of the changes to wind uplift calculations, the fixings for many roofs will have to be increased. Report any issues to the supplier as soon as they arise. If issues arise, they should be reported to the supplier as soon as possible. The increased emphasis on mechanical fixings will also raise concerns regarding installation time and costs. Site powered by Webvision Cloud.
With a range of lightweight underlays available and their usage commonplace, new guidelines have been put in place to ensure their correct usage. Download a pdf copy of the Headlap Tables here. Perimeter roof cladding elements should be mechanically fixed with a minimum of two fixings. On steeper pitches with free-flowing drainage, smaller slates may be used. In general, the lower the pitch of the roof, the greater the lap should be.
Roofing contractors should be aware that they must have a fixing specification in place in order both to quote for the work and to do the work to the new standards. The most commonly used slate size in Southern England is xmm and xmm in Scotland and the North of England. Size of Head Lap vs Pitch of roof In general, the lower the pitch of the roof, the greater the lap should be.
The proportion of each will depend on a number of factors, including product, location and pitch. This includes a number of changes to fixings, battens, underlay and mortar specifications. The updated British Standard for slating and tiling contains a number of changes intended to improve the overall security of roof structures. This longer lap will help to resist both capillary action and wind uplift.
Whilst the British Standard is not enforced as a legal requirement, the standard is in place to protect both those in the construction industry and those purchasing the end product. How to reduce the risk of call-backs.
Mortar work should also be completed in one operation and within two hours for ridges, hips, valleys and verges, with deeper beds being allowed to be pointed up in a separate stage. Where abnormal weather conditions might be expected, e. Previously, using mortar as the sole means of fixing roof tiles was sufficient, but this is no longer the case.
Size of Head Lap vs Pitch of roof
Not using one would be in breach of both of the standards. It can also be difficult to find a practical or acceptable aesthetic way to fix the tile mechanically on the roof of some listed buildings. Save time without compromising on aesthetics. These new fixing specifications will ensure that roof construction is more robust, giving greater longevity and increased resistance to the elements.
The changes means that the grading of battens can no longer be done on site. Guidance on achieving such a suitable roofing mortar, to be used in conjunction with a mechanical fixing, is outlined in detail within the British standard. This means that the method of bedding with one mix and pointing with another should be avoided. It is not a legal requirement to install a roof in accordance with the British standard. However, the standard can be included within a specification, and this can be upheld in a court if necessary.
Fixings on roofing has increased, but in most cases of slates and plain tiles are not affected. Bedded tiles or fittings must also have a mechanical fix. Your email address will not be published.
This module is sponsored by Marley Eternit. One can be a tile clip, adhesive or dry-verge capping system where appropriate. The new calculation methods will prompt a drive towards more robust fixing specifications, adobe photoshop cs4 filters especially for single-lap tiles.
Leave a Reply Cancel reply Your email address will not be published. Careful consideration should be given when roofing mortar is being mixed, and an additional mechanical fixing must also accompany the bedding. Information may also be made available to third parties.
This places a load on the underside of the roof covering, and has the potential to dislodge it. This image shows an unrestrained lap and demonstrates how ballooning or stretching of the underlay can transfer load to the tiles.
The mortar must also use a suitable sand and cement mix. Equipped with this information, you can easily make sure that your roofing installation meets the updated British Standard. Due to the foreseen extra amounts of work with mechanical fixing, there was concern about increased installation time, but many fixing systems are available to help speed up this process. The use of mortar as the sole means of fixing roof tiles and fittings is now deemed insufficient.
Headlap Tables for Natural Slate BS
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