The values shown in the slate coverage chart above are calculated using nominal sizes and incorporate a 5mm jointing gap.
Slate roof weight per square metre.
The number of roof slates that are needed depends on the slate size and the lap in mm.
These are the weights of typical actual products.
Some thicker slates can be much larger and heavier slate per square calculator.
Tile batten gauge for slate.
20 tiles per m.
The weights of other actual products of the same type may vary.
If the roof pitch is 35 the roof span is 6 5m wide and the roof length is 12 6m using the reference guide graphic above the calculation for the slope would look like this.
That s a great question especially when you are comparing it against other roofing products.
500 x 250mm 500 x 375mm.
Total linear run of tile batten in metres.
400 x 250mm 400 x 375mm.
Roof span 2 x roof pitch constant for rafter rafter length.
Holing gauge for holing slates.
Slate sizes can start as small as 6 12 inches and be as large as 16 24.
To calculate the weight per square metre simply multiply the weight per slate given below by the number of slates per square metre for the same slate listed above.
1 lb m ft 2 4 88 kg m 2.
The amount of slates you need per square metre m2 depends on which slate size you re using.
This calculator will estimate the following number of slates required per square metre.
Tiles per square metre.
Siga 114 natural slate.
This table shows the required number of slates per square metre for effective coverage.
The weight of truss rafter must be added to calculate the dead load of the roof.
Back in 1926 the commercial standard slate thickness was 3 16.
Siga 56v natural slate.
For example if you re using a 20 10 slate 500mmx250mm you will require 21 slate per m2.
How much does slate weigh.
Weight of roofing materials.
Ft kilograms per square meter kg m 2 source.
Here is an example of how the roofing measurement process works on a basic duo pitched roof.
A 24 12 slate 600mmx300mm demands only 13 slate per m2.
20 tiles per m.
25 tiles per m.
500 x 250mm slate 4 5mm thick 1 889 kg x 18 8 at 75mm lap 35 51kg per square metre.
Siga 35 natural slate.
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.
Roofing slate created by nature over 500 million years ago has been used as a roof covering for more than a thousand years.
