If the ridge tiles are firmly attached to the roof but the mortar between them is cracked, this mortar needs to be replaced: In older properties, ridge tiles sometimes become loose especially where old lime mortar breaks down.Ĭracked and crumbling mortar should be carefully removed using a hammer and chisel from the surface of the slates/tiles, from the ends of adjacent ridge tiles and from the underside of the ridge tile if it is being re-used. Traditionally ridge tiles are affixed to the the tiles/slates on both sides using a bed of mortar on each side of the ridge, most modern tile manufacturers offer a method to mechanically secure the ridge tiles without mortar - see below. Where the roof design has different ridges meeting, (such as a horizontal ridge meeting angled hip ridges or two horizontal ridges joining), the ridge tiles have to be cut so that there is a uniform gap of about 10mm where they meet - this gap allows for a neat cement joint. Modern roofs sometimes use ridge tiles which incorporate vents for ventilating the roof space, these are normally fitted every 4th or 5th tile along the ridge. Two commonly used profiles for ridge tiles are half round and angular the angular ridge tiles are usually used for slate roofs - each profile are illustrated below. the ridge) is usually sealed by ridge tiles which sit astride the apex and overlap onto the roof covering on both sides.
The top of pitched slate and tiled roofs (i.e.
Mortar bonded - fixing systems Safety: Working on a roof involves working at height, so always use scaffolding or other stable platform, never use just ladders (even on a bungalow).
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