Roof Design Principles to prevent leaking roofs 

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Flat Roof types 

1. Derbigum on concrete 

2. Derbigum on Timber 

3. Sanafil PVC membrane

4. Cementitious  water proofing.

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Low pitched roof  0-10 Degrees 

Klip Lok  700 Min angle 1-10 degrees depending on rain intensity   / Klip Tite rolled Sheeting 

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1.  IBR profile 

Recommended pitch 10 degrees / greater than 5°  depending on length 

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2.  Corrugated Iron Roof profile 

Recommended pitch 15 degrees 

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3.  Cement Tile Roof 

BMI coverland Double roman/ Elite tiles 17 degrees recommended minimum pitch

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4. Leaks caused by wind on metal sheet roofing. Ridge can be protected by ridge closure or a products such as Dry Ridge stick on membrane to prevent the rain being blown up the sheeting and entering the building

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