Roof design

Roof Design
An explanation of roof design and terminology

1. Eaves The eaves is where the roof drains into the gutter and is the point where there is the most water, therefore careful attention to detail is important. If there is a gap below the tiles at the eaves of 16mm or more then eaves fillers are required for profiled tiles to prevent access to birds and rodents. The eaves also play a major part in ventilating the roof, using the universal Sandtoft eaves ventilation system (both 10mm and 25mm sizes), which can be used with all our tiles and slates.     2. Verges Where the roof starts and finishes at a gable wall this is commonly referred to as the roof verge. Traditionally verges are finished with a mortar bedding but to avoid the need for future maintenance most of our tile and slate ranges can be dry-fixed using a cloaked tile or dry verge system.   3. Ridge The ridgeline finishes off the roof at the top and the ridge tiles can be traditionally bedded or dry fixed using the Sandtoft dry ridge system. Unlike mortar bedding, dry systems can be fixed in any weather and require very little maintenance. Ridges also offer great design opportunities using decorative ridges and finials. As with the eaves, the ridge can play a major part in ventilating the roof so again it is worth considering using the dry ridge system to ensure adequate ventilation.   4. Hip A hip is where two roof slopes meet, forming a junction from which the water runs away. Like the ridge the hip junction can either be bedded or finished dry for an all weather fixing, maintenance free finish. Mitred hips can be used with the BritLock and BrtiSlate and bonnet or arris hips can be used with plain tiles.   5. Valley A valley is where two roof slopes meet, forming a junction into which the water runs. Valleys are made watertight using fibreglass or lead to line the valley. With plain tiles valley tiles can be used for aesthetic purposes. Tile-and-a-halfs and double tiles are available for some tiles to assist setting out.   6. Top Abutment Where a roof meets a wall or other vertical projection at the top of the filing this is referred to as a top abutment. Top abutments are finished using a lead cover flashing. Ventilation can be provided for any tile of slate using our new Roll vent system.   7. Side Abutment A side abutment is where a roof verge meets a wall that rises above the tiling. Profiled tiles can be weathered using a cover flashing. For flat tiles a secret gutter should be used and for double lapped tiles and slates soakers should be used.       

    Need help? Contact Sandtoft Technical Services on 0844 9395 999

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