Berriman Pitched Roofing Services…
Roofing slate is dense, durable, naturally occurring material that is essentially non-absorbent. Two properties of slate are cleavage and fracture. It has natural cleavage which permits it to be easily split in one direction. Fracture, usually occurring at right angles to the cleavage is called the grain. Roofing slate commonly is split so the length of the slate runs in the direction of the grain. The surface texture of the slate after being split for commercial use derives from the characteristics of the rock from which it was quarried. Some slate splits to a smooth practically even surface while other yields a surface that is rough and uneven. The colour of slate is determined by its chemical and mineral composition. Because these factors differ from various regions, roofing slate can be obtained in a variety of colours. In addition exposure to weather causes slate to change colour also. The degree of change varies depending on the slate. Slate exhibiting minimal colour change is known as “permanent” or “unfading”slate. Slate that shows a more marked colour change is known as “weathering” slate. Between unfading slate and weathering slate is “semi weathering” slate.
Fibre Cement Slate
Fibre cement slates have been used throughout the United Kingdom for the last 30 years and are almost identical to natural slate their smooth surface and authentic edges lend themselves to all manner of roofing. They are an economic and environmentally friendly alternative to natural slates they are also available in blue black and welsh blue.
A range of single and cross cambered tiles combining the quality of hand crafted clay. Which are produced from the finest clays with a smooth finish, mellows naturally with age. The rosemary brand synonymous with clay plain tiles.
Concrete tiles are made of Portland cement, sand and water in varying proportions. The material is mixed and extruded on the moulds under high pressure. The exposed surface of the tile may be finished with cementitious material coloured with synthetic oxide additives. The tiles are cured to reach the required strength. They generally have lugs on their undersides for anchoring to batten strips. There are additional waterlocks or interlocking ribs on the longitudinal edges that impede movement and prevent water infiltration.