Roof Pitch (Slope)

A roof must have some slope in order to shed rainwater. So in reality flat roofs are never totally flat but rather have a slight fall – the minimum of a “Flat” roof is 1:50. It is more accurate to describe such a roof as “semi flat”

Essential properties for a roof – Part 3

Resist temperatures from -10⁰C to +80⁰C, and rapid reversals of temperatures of the order of 60⁰C, without deterioration of the roofs essential properties. Resist the effects of standing water on the top surface, and condensation at the under surface. Accumulated hail on roofs after moderate storms must not result in water penetrating the interior of … Read more

Essential properties for a roof – Part 2

The South African National Building Regulations (SANS 4.2) states that: Any roof covering and waterproofing system, or part thereof must: Be capable of being effectively repaired despite aging of the material. Products used in roof coverings and waterproofing systems must preserve their properties satisfactorily with normal maintenance for at least 10 years for systems which … Read more

Essential properties for a roof

The South African National Building Regulations (SANS 4.2) states that: Any roof covering and waterproofing system, or part thereof must: Resist the penetration of rain – at least to the extent that any water which may penetrate the roof is of sufficient intensity to run down the inside surface of the roof or walls, or … Read more

SANS – Competent Person

What the law says about competency SANS – South African Nation Standards The new definition of a competent person means; A person who is qualified by virtue of his education, training, experience in his specific field. As per the construction regulation 2014 occupational Health and Safety act of 1993. It states that inspections on roofs … Read more

Protection of Waterproofing

Nearly all waterproofing systems need protection against the effects of ultraviolet rays in sunlight and weather conditions. Where the roof will not be subjected to regular pedestrian traffic protection it can be provided by bitumen based paints the reflective type, eg. silver roof paint, aluminium paint. Or by covering with crushed stone on protective lining, … Read more

In-situ reinforced and Non-reinforced based waterproofing (Cementitious Waterproofing)

A synthetic latex additive for cement and mortar mixtures are used. Cementitious waterproofing systems rely on a acrylic or latex based waterproofing compound, which is mixed with cement and sand to give it strength and consistency. This waterproofing system can be used with a textured membrane which they saturate with the product. Cementitious waterproofing systems … Read more

Heat Fused Waterproofing System (TORCH-ON)

Heat Fused Torch-On consists of modified bitumen. As long as it is installed by a competent person, this waterproofing system is tried and tested system that should come with a 10 year guarantee. Heat fused waterproofing systems should be installed in the direction of the fall towards the outlets. This system is applied with a … Read more

Reinforced Liquid applies system

Membranes based on acrylic polymer binders reinforced with non woven polyester or polypropylene fabrics, perform well as waterproofing membranes and show good durability. These fully bonded system requires detailed specification, during application. Modified bitumen may also be reinforced with a non-woven fabric, but they need additional protection.