What is the difference between single lap and double lap tiles?

What is the difference between single lap and double lap tiles?

The key difference between single camber and double camber clay tiles is their shape. Single camber tiles are curved in one direction – on the long edge. Double camber tiles are curved in two directions from top to bottom (like single camber tiles), and also from left to right.

What is tiling Headlap?

BS 5534:2014 is the code of Practice for Slating and Tiling. It describes not only the means of installing slates (nailing or hook fixings), but also the “headlaps” or “lap” required to ensure that the roof remains watertight, even at pitches as low as 20 degrees.

Why do roof tiles overlap?

Laying interlocking tiles The tiles going up the roof are normally directly above each other, there is no need to stagger them as the side joints are automatically sealed by overlaps. This layout gives a single lap covering, (i.e. the top part of each tile is covered by just one tile).

What are overlapping tiles called?

The imbrex and tegula (plural imbrices and tegulae) were overlapping roof tiles used in ancient Greek and Roman architecture as a waterproof and durable roof covering. When well-made and properly imbricated (overlapped), there was little need for further waterproofing or sealant.

Should roof tiles be nailed down UK?

It is not necessary to nail every single tile to the battens. Every tile of the two rows at the eaves, those up the verges, and along the two rows of the ridge should be nailed, but beyond that it is only necessary to nail every fifth tile horizontally and every third tile as you move up the roof.

How much should roof tile overlap?

This is normally specified with the tile manufacturer and it’s advisable to check how much they say a roof tile should overlap, normally on a smooth faced tile the overlap is 75mm (3″) and on granular or sandfaced tiles its 100mm (4″) however if the roof is shallow pitched, is facing a windy direction or will be prone …

What is the lap on plain tiles?

double lapped
Plain tiles have to be laid double lapped, which means there have to be two layers of tile throughout the roof and at the end laps of the tiles the top tile must overlap the tile two below it.

How much should slates overlap?

On a slate roof this is the critical overlap and is necessary to prevent water penetration and leakage. The roof pitch typically relates to the required head lap as follows: 20 degrees: 115 mm minimum head lap. 25 degrees: 85 mm.

How much should Roof Tile overlap?

Your tiles should overlap one another by between 75mm and 100mm, depending upon their size as well as the pitch of your roof. This should mean that the gauge of your roofing battens will be around 32-35cm, measuring from the top of one batten to the top of the one below it.

Do roof tiles need to be nailed down?

For all roof areas and rafter pitches, every tile should be mechanically fixed with at least a nail, a clip, or a combination of these options that provide adequate combined resistance to the wind uplift loads on the tiles.

What is single lap tiles?

Single lap tiling Most single lap tiles have a tongue-and-groove joint along the side edges to form a series of interlocking joints. There is a reduction in weight of the overall roof covering compared to double lap tiling, but the batton size will be larger.

Which tile is best for roof?

Here are the main roofing tiles.

1. Metal Tiles. Metal tiles are similar to metal roofs in that they share most of the advantages.
2. Copper Tiles. Copper roofs are known to last for more than a century before they need to be replaced.
3. Stone Tiles.
4. Ceramic Tiles.
5. Polymer-Sand Tiles.
6. Composite Tiles.
7. Bituminous Tiles.
8. Concrete Tiles.

What are the different types of double lap tiles?

Typical double lap tiles include: Curved valley tile. Bonnet hip tile. A single lap of one tile over another is sufficient to provide the weather tightness required. Most single lap tiles have a tongue-and-groove joint along the side edges to form a series of interlocking joints.

Do double lap roof tiles need to be nailed?

Generally, unless the roof exposure is high, only every fourth course of tiles is nailed. Double lap tiles are laid to a bond so that the edge joints between the tiles are in the centre of the tiles immediately below and above. Typical double lap tiles include: Standard plain tile: 265 x 165 mm.

What is the difference between single lap and double lap slates?

Fibre cement slates and some resin slates are also laid in the same way. The remainder of the roofing products called slates are single-lap tiles, made from either concrete, resin slate, clay or metal. Single lap slates require far fewer units per square metre of roof than a double lap product.

How do you make a double lap on a fascia?

The lowest row of tiles at the fascia board is made up of shorter tiles to provide the double lap for the first row of full ones, the lower edges of these short tiles and the first row of full tiles should be the same. The top row of tiles at the ridge is also made up of half tiles to give the next row down a double lap.