Rafter spacing for metal roofing4/21/2024 The tile’s bottom edge should almost reach the gutter’s centre. Place a sample tile (loosely, without fixing) ensuring its bottom edge extends past the fascia and gutter by the length specified in the tile manufacturer’s recommendations. Calculating Roof Batten Spacing & Installationīegin by pinpointing the first roof batten’s location at the eaves, which is the roof’s lowest part. If full courses aren’t achievable within the available shunt, consider a short course of cut tiles at the bottom or top. Round up to the nearest whole and divide the original distance by this number for the accurate gauge.įor tiles with a fixed gauge, examine the tile batch to figure out possible shunt between courses. Joints should be varied for aesthetic uniformity and structural stability.įor variable lap tiles, ascertain the gauge by dividing the distance between the initial and final batten by the maximum tile gauge.They should cover at least three rafters with a minimum length of 1.2m.Battens should be securely fixed to rafters not spaced more than 600mm apart.25x50mm battens are apt for single-lap Modern roof tiles with a 600mm maximum rafter span.This directly impacts the weather resistance and aesthetic appeal of your roof. It’s essential for the proper placement and alignment of roof tiles.īefore you plunge into installing battens and counter battens, ensure that their size and batten spacing align with your chosen tiles. The batten gauge is a term used to denote the spacing between roof battens. This ensures water is directed away from the opening. Place an additional underlay piece or a specialised underlay protector above the penetration. Pipe Penetrations: When dealing with pipes or other protrusions, cut the underlay carefully and turn it for a tight fit.Back: Overlap the back material by at least 150mm, or 100mm for pitches over 35 degrees.Side and Top: Turn up the underlay by 50mm.Refer to the Tiling Section for detailed valley handling. If using metal valley linings, don’t place them directly over the underlay. Valleys: Aim for a 300mm overlap at the center or lay a continuous 600mm wide strip.Hips: Ensure a 150mm overlap at the hip line.Monopitch ridges: The underlay must surpass the top fascia or masonry by at least 100mm.For dry fix ventilated ridge systems, adhere to the manufacturer’s overlap specifications. Reduce this to 100mm for roofs with a pitch over 35 degrees. Duo-pitch ridges: The underlays should overlap by a minimum of 150mm.For dry verge systems, follow the tile manufacturer’s guidelines for overhanging. Verge Handling: For bedded verges, let the underlay extend over the outer brickwork or outer rafter.Adjust headlap accordingly or secure with tape or nails. Ensure vertical laps are at least 100mm wide and align them with a rafter. For roofs with pitches over 35 degrees, a lap of 100mm suffices. Overlaps: Maintain a horizontal lap of at least 150mm.Using underlay support trays at the eaves can help, ensuring a 150mm overlap over these trays. This aids in draining water into the gutter if it finds its way into the batten cavity. Drainage: Keep a slight drape of about 10mm between the rafters.It’s crucial to maintain uniform tightness. Initial Layout: Commence by laying the underlay parallel to the eaves.However, if you need to use nails, consider extra large head felt nails, 20mm long with a 3.35mm shank diameter. Typically, tile battens retain the underlay.The underlay should, at a minimum, meet the wind uplift resistance specifications detailed in BS 5534.For alternative situations, consult with both the tile and underlay manufacturers. This article provides a concise guide on how to install underlays when both the underlay and tile battens are fixed directly onto the rafters. Modern alternatives, however, offer durability combined with reduced weight. Traditional choices, like the Type 1F bitumen felt, although once popular, can grow brittle. The underlay acts as a protective barrier, offering both insulation and an additional waterproof shield, safeguarding against any water trickling beneath the roof covering. In this Roof Batten Installation Guide, we will walk you through the step-by-step process of installing roof battens, ensuring that you have all the tools and knowledge needed to achieve a solid and well-protected roof. This Roof Batten Installation Guide is your essential roadmap when diving into the nuanced world of roofing.īattens set the stage for your roof tiles while also shielding your home from the elements. Skirting and Architrave Advice & Guides.Performance Plasterboard Advice & Guides.Mineral Wool Insulation Advice & Guides.
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