Guideline for Roof Slopes

To avoid any water leaks on your roof, you should follow this guideline for roof slopes below. With different materials used to make the roof, the roof slopes must be different too.

 

This “Guideline for Roof Slopes” is taken from the book Architects’ Data written by Ernst and Peter Neufert, whereas this book has become the guideline for architecture college students in the world.

 

RoofPermittedUsually
Paved roof for walking on2° - 4°3° - 4°
Wood cement roof2,5° - 4°3° - 4°
Roof with roof felting, graveled3° - 30°4° - 10°
Roof with roof felting, double 4° - 50°6° - 12°
Zinc, double upright folded joints (standing seams)3° - 90°5° - 30°
Felted roof, single8° - 15°10° - 12°
Plain steel sheeted roof12° - 18°15°
Interlocking tiled roof, 4 segment18° - 50°22° - 45°
Shingle roof (shingle canopy 90°)18° - 21°19° - 20°
Interlocking tiled roof, standard20° - 33°22°
Zinc and steel corrugated sheet roof18° - 35°25°
Corrugated fiber cement sheet roof5° - 90°30°
Artificial slate roof20° - 90°25° - 45°
Slate roof, double decked25° - 90°30° - 50°
Slate roof, standard30° - 90°45°
Glass roof30° - 45°33°
Tiled roof, double30° - 60°45°
Tiled roof, plain tiled35° - 60°45°
Tiled roof, pantiled roof40° - 60°45°
Split stone tiled roof45° - 50°45°
Roof thatched with reed or straw45° - 80°60° - 70°

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