While roofing materials knowledge is of utmost importance, selecting the right commercial roofing system is only half of what contributes to the success of a roofing project. The most important part to consider is that each roofing system is only as good as the commercial roofer who installs it. Proper installation is essential to fully maximize the benefits of the roof system and your capital investment. The craftsmanship in the flashing and detail work is critical to the success of your roof. You can have the very best materials utilized on your roof; however, installation by an average commercial roofer will result in average roof system performance.
Conventional Slate Roof Installation
- Minimum Pitch - 30°
- Weight per Roofing m2 - 78kgs
- Available Colours - Multicolour, West Country, Silver/ Blue
- Slates centre nailed
- Length of nails to be at least twice the slate thickness
- The roofing slates are available in various sizes but all vary in thickness from 9-15mm. These slates when delivered to site require to be sorted and are generally graded in six categories, according to thickness.
- All timber-work and gutters must be completed before slating can commence.
- The timber battens must be "marked out" to indicate the position of all the vertical joints.
- The Slates are then loaded onto the roof. Ladders & Labourers may be used for moving the slates onto the roof up to a maximum height of two storeys, there-after a mechanical hoist, usually supplied by the builder, will be required.
- The roof is laid in such a manner that the thicker grades are utilised from the bottom up, i.e. thicker slates at the eaves, thinner slates at the ridges.
- When commencing slating an eaves slate, top nailed, is laid horizontally on the first batten above the facia board at the gutter.
- A full, conventional slate centre nailed is then laid horizontally to the second batten covering the eaves course. i.e. This would result in a double-thickness of slates with the under eave slate as the first course. The courses of slates thereafter are centre nailed above the top edge of the slates in the previous course. This process is then repeated with each batten receiving a layer of slate.
- Care must be taken to ensure that the slates are laid in straight lines horizontally, with the joints vertical from the eaves to the ridge, the slates abutting against each other to form the joints.
- Hip-slates (i.e. those slates which are similar to those generally used throughout the roof but not necessarily the same width and not drilled) should be used when hips, valleys, ridges, etc. are to be slated.
- When calculating slate requirements for a conventional roof the conversion from flat sq metres to roofing sq metres is 2,5.
Note: This system for roofs in excess of 30° is highly recommended.