The top part of each slate is covered by two slates the centre of the slate of the next row and the lower part of the slate above that.
Slate roof tile overlap.
The recommendations shown above are based on a maximum height to eave of 12m and a maximum rafter length of 9m in moderate exposure and 6m in severe exposure.
Headlap is what keeps the water from penetrating through the roof.
Before starting work it s important to know the dimensions of the roof and the type of tile you will be using.
What roof pitch do i need for what slate size generally speaking 20 degrees is the lowest advisable pitch for a slate roof depending on the size of the slates and how much that the roof is exposed to.
Weight of slates kg area of roof m 2 slate coverage 1000 therefore the total weight 1235 1000 150 23 9 4427 kg.
The fairly cheap and common shingle roofs that many people have are quite light.
Our tiles are engineered to be lighter to resist impact and to maintain their color longer.
A factor which can vastly change the price of a new roof or improvements to an existing roof is the number of tiles used.
When the head of a slate is overlapped by the slate two courses above it that s called headlap that s the critical overlap on a slate roof figure 2.
Minimum pitch for slate roof when considering the minimum pitch for a slated roof it is necessary to establish the exposure of the site the length of rafter and the height of the building.
Roof battens and gauge the gauge is the space between the roof battens this will set the overlap of your chosen slate in most cases.
Set the last batten at the ridge so that the ridge tiles will overlap the top course of tiles by at least 75mm.
The slate coverage per m2 can be found from table 2 23 9.
The overlap will depend upon the slope of the roof the steeper the slope the smaller the overlap required.
Setting out up the roof gauge set the first batten at eaves to allow the tails of the eaves course tiles to overhang the fascia by 40 to 45mm ie.
The total weight of slates on roof can be found from the formula.
Slate size roof pitch and exposure 65 mm.
It s hard to beat mother nature but davinci has done it.
For a relatively average house with a 1 500 square foot roof the total of underlayment and tiles will equal something approaching 8 tons in weight.
While it s a more costly option due to the processes and materials that go into its manufacturing this versatile slate can be used on pitched roofs at 15.
If you are transitioning from a light roof to a tile roof the weight difference will be substantial.
The redland cambrian grey slate is a good example of man made slate as it is composed of 60 of natural slate the slate also comes with interlocking ability.
This layout gives a double lap covering i e.
