• Our Advantage：Own Factory, Experienced QC
• Surface Finishing：Split
• Finished：Natural,Mushroom, Natural Split and Rough Edge
• Features：with Good Acid; Low Water Absorption; Excellent an
• Other Products：Culture Stone, Slate, Mosaic, Cobble and Pebble
• Transport Package：Strong Wooden Crate
• Specification：standard size 400x200mm and customized
• Trademark：Tianyuan stone
• Origin：China
• HS Code：68029390
• Production Capacity：3000 Square Meters Per Month

Stone Name:Black Natural Slate Tile, Roof SlateMaterial:Natural  Slate StoneStone Colors:Grey, Beige, Black, Rusty, Red, Green, etc..Type:Square, Rectanglar,etccolorBlack, black rusty, yellow, tan, rusty, grey, green and so onSize:from 60x30cm, 50x25cm,40x25cm to 40x20cm, and 20x20cm, etc.;Thickness:5-7mm, 6-8mm,7-9mm supplied available;Weight:Abt 25Kgs/Sq.M. for thickness of 1cm, Abt 50Kgs/Sq.M for thickness of 2cmSurface Finishing:Split natural, honed surface, sand blasted, curving, painting; bottom side calibrated treatmentUsage:RoofPacking:Strong Fumigated Wooden Crates or Fumigated-free cratesSHOS Standards:  

1.Length and Width tolerance: ±0.5mm;
2.Angles tolerance less: ±1º;
3.Thickness tolerance: ±1mm;
4.Flat surface without pyrite point and other color points.
5.Tiles accordant color;
6.Each pc sound control

1.)How many m2 roof slate will be needed to cover 1 m2 roof area?

Usually to 2.5-2.8 m2 square shaped roof slate can cover 1 m2 roof area; 

Other specific type like thickness 1.8-2.1 m2 roof slate can cover 1 m2 roof area. 

Anyway,it's up to your installation way in actual situations.
 

2.)The weight of 1 m2 roof slate?

Density to slate is about 2.78, 

Fox example thickness is 5-7mm, the weight of 1 m2 is 1x0.006x2.78 = 16.68 kgs. 

More thick, more weight of course.
 

3.) How many years of the roof slate can use?

Natural slate stone roof tile can use more than 70-75 years.
 

Features Of Slate

1.Long service life;
2.Highest storm resisting strength;
3.Natural building material;
4.Eco-friendly , no costs for waste disposal;
5.No architectural limits, for commerce and  private residence;
6.Has a unique style;
7.Easy for installation;
8.Convenient to clean;
9.Good for health;
10.Choice of high taste;
11.Safety and environment protection.