How many slates you need to cover your roof per square metre depends on the gauge and increments according to your roof pitch.
How many roof slates per meter.
The values shown in the slate coverage chart above are calculated using nominal sizes and incorporate a 5mm jointing gap.
We recommend the addition of at least 5 wastage allowance.
How many roof tiles do i need.
Likewise you can use this guide to calculate the same around chimneys and skylights or anywhere where cutting is involved.
Once that you have the first layer of slates on your battens the next layer and onwards to the ridge should be layered on top.
If you know the surface area of your roof you can use our simple roof slate calculator to give you the exact amount of slates you require to complete the job.
For your chosen size of slate use this coverage table to calculate how many slates per m2 your roof will require.
This table shows the required number of slates per square metre for effective coverage.
18 10 450mmx250mm 23 slate per m2.
They can be clay or concrete which is cheaper and are placed next.
The number of roof slates that are needed depends on the slate size and the lap in mm.
16 10 400mmx250mm 27 slate per m2.
For your chosen size of slate use this coverage table to calculate how many slates per m2 your roof will require.
How many slates per m2.
Area of slope rafter length x roof length x 2 on both sides of the roof with the figures in this example the calculation would look like this.
3 97 x 12 6 x 2 100 04m total roof area when you know this you can work out all the materials needed to complete your project.
Decent quality examples come in at around 25 30 per m2 which is keen enough to compete with plain clay tiles.
One advantage of going for a british or spanish product is that it will meet european standards bs en.
Across a full roof with a tiled area of 170m2 this could equate to a saving of 1 700 or more compared to home grown slate.
Information sheet on slates and tiles roof tiling there are many types and designs of roof tiles but they essentially fall into two categories.
Per square smaller roofing slates actually weigh more than larger slates and come in at around 800lbs square while larger slates 12 24 weigh about 700lbs square.
Slate sizes can start as small as 6 12 inches and be as large as 16 24.
16 8 400mmx200mm 29 slate per m2.
24 12 600mmx300mm 13 slate per m2.
Tile batten gauge for slate.
Individual tiles normally called plain tiles these are about 12mm 1 2inch thick and took over from slate roofing in the 1930 s.
Total linear run of tile batten in metres.
Holing gauge for holing slates.
Therefore if your rafter length was 4 linear meters your calculation would be 4 x 2 5 10 quantity slate half s.
You would need 2 5 of these slate per linear metre.
