Fibre Cement Slates Fixing Guide
20Pages

Fibre cement slates fixing guide Customer Services Tel 01283 722588 Fax 01283 722219 E-mail info@marleyeternit.co.uk www.marleyeternit.co.uk Marley Eternit Limited, Lichfield Road, Branston, Burton on Trent DE14 3HD Fibre cement slates fixing guide

Slate dimensions, lap, gauge and estimating Marley Eternit, a market leader in the design and manufacture of roofing products, offers high quality, durable fibre cement slates in a variety of colours, sizes and textures. Marley Eternit slates are manufactured from natural and synthetic fibres, cement and other additives. They are complemented by a wide range of ridges, double blanks for details at verges, hips and valleys, together with fixings and accessories for all roofing applications. Marley Eternit slates are suitable for roof pitches of 23° and above and for vertical cladding. For...

The appropriate lap will depend on the pitch of the roof, together with other factors such as the exposure of the site, the length of the rafters and other design considerations. Where rafter lengths are greater than 9 metres in moderate exposure or greater than 6 metres in severe exposure, please consult the Technical Advisory Service. Where abnormal conditions may be expected, e.g. on elevated sites, near the coast or in localities where heavy falls of snow are common, the lap treatments should be as shown in Table 2 below for sites of 'severe' exposure. Size of Typical Laps Moderate...

Site working & setting out Nails, rivets, screws Slates should be fixed in accordance with BS 5534 ‘Code of practice for slating and tiling (including shingles)’ and BS 8000-6 ‘Workmanship on building sites ‘Code of practice for slating and tiling of roofs and claddings’. Slate nails: nails for fixing slates should be 2.65mm (12 swg) Marley Eternit Slates jagged copper nails, 30mm long. Batten nails: nails for fixing battens should be in accordance with BS 5534. Slate rivets: copper disc rivet, 19mm x 2mm stem, 19mm dia. x 0.5mm thick base. Screws: 60mm x 6.3mm self-sealing, nylon headed...

Slate fixing method All slates should be fixed in accordance with BS 5534 and BS 8000-6 Slates should be laid broken bond using slate-and-a half width slates in alternate courses formed from double width slates at verges, hips, valley’s and abutments. Allow a 5mm gap between adjacent slates for disc rivet shank Installation procedure for laying and fixing slates Nail slates firmly but do not drive nails too tight to the surface of the slate 1 Set out the roof battens by calculating the gauge using the formula on page 7. Allow for the eaves courses of slates to overhang the fascia or tilting...

Slate fixing method (continued) 3 Cut and nail fix second under-eaves course to the lower eaves batten with slate-and-a half widths at the verge, ensuring a copper disc rivet is fitted centrally between adjacent slates (5mm gap) to align the pin with the hole in the front edge of the first course of full length slates. Prior to fixing the slate-and-a-half verge slate, drill a 4mm dia. hole half a slate width distance in from the verge and 25mm up, to allow for the disc rivet to fix the first full slate course above. Continue to lay the first course of full length slates, twice nailing each...

Slate fixing method (continued) 5 At verges and abutments, lay the first full length slate-and-ahalf slate, ensuring that 3No. 4mm dia. holes are drilled on the batten line with 2No. additional holes for the copper disc rivets. For remaining courses where single and slate-and-a-half slates are used, a third disc rivet hole is needed to allow for the rivet pin for the next single width verge slate (at point C). This is drilled half the single slate width from the side of the slate and 25mm plus the gauge distance from the tail (Fig 7). Lap Margin = gauge 3 nail holes (C) 2 rive t holes 7 At...

Table 7 Main roof pitch fascia reduction Ventilation requirements to be in accordance with BS 5534 and BS 5250. A tilting fillet is not required when using the eaves ventilator. The tilt is formed by raising the fascia board 11-18mm above rafter level. The eaves vent unit is placed on the fascia providing the required tilt, removing the need for an eaves underlay protector. Marley Eternit universal eaves ventilation systems are designed to provide continuous 10mm or 25mm free vent areas to roof voids in an efficient and unobtrusive manner for roof pitches to 55°. The 25mm system can also be...

Standard eaves Eaves batten For fibre cement slates, it is essential for the function and long term performance of the roof that three courses of slates are laid at all eaves. Set out the under-eaves battens to accommodate the typical under-eaves slate lengths as shown in Table 6 below. Size as slating batten. Tilting fillet The dual purpose of the tilting fillet is to ensure that the underlay is evenly dressed over the fascia to avoid trapping water and, in association with the fascia, commence the correct laying of the slates. To achieve these functions, the fascia/tilting fillet should...

verges Slate verge trim The aluminium slate verge trim provides the benefits of a dry verge for Marley Eternit fibre cement slates. Installation at ridge apex 1 Prior to fixing, offer the left hand trim up to the apex of the ridge and plumb cut the depth of the trim to the desired angle dependent on the pitch of the roof . Cut away a slot 30mm x 5mm behind the down leg. Nail the left hand trim into place. Carefully interlock the right hand length of trim into the left hand length. The trim can be used with or without bargeboard but is not suitable for raking verges. Installation for...

ridges Ventilated Ridge Roll* for use with fibre cement ridges The Marley Eternit duo pitch ventilated ridge system is manufactured in fibre cement for use with fibre cement slates. The fibre cement ridge cappings are used in conjunction with the ventilated Ridge Roll and provides 5000mm2/m ventilation to the roof apex. Locate the starter ridge stop end at one end of the roof apex, above the Ridge Roll, and drill and screw the end of the ridge to the ridge fix battens. Holes should be drilled 125mm from the effective ends, 50mm up i.e. ignoring the socket. Apply a 6mm dia. butyl strip...