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Roof Waterproofing & Roof Repairs Introduction & More : 

This page is purely an introduction and a brief technical look at just a few reasons why roofs start to leak and the stresses they undergo. After reading this you are also in a better place to deal with the differences in quotes from company to company and the different services also offered.

 

  

Important Roofing Related Termanology 

Capillary Action : 

For example, rainwater, laden with chloride, typically runs over a roof and is discharged into the gutters. Capillary action at the overlapped joint tends to pull water under the upper roof sheet, holding it there as it slowly dries out and concentrates the amount of chloride in the joint.

Source Of information is from -https://www.corrosionpedia.com › definition › capillary-action

                                                 

 

Thermal Expansion Metal Roof Sheets :

 

 A number of myths often circulate about metal roofs. One of the most common questions that many people often have about metal roofs is whether or not they will expand and contract. It is true that metal roofs will expand and contract. This is because metal roofs tend to heat up when the sun rises each morning. During cooler temperatures, the metal will contract.

Roof Wind Uplift - Mainly related to metal roofs

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Multiply the temperature change by 7.2 x 10-6, which is the expansion coefficient for steel. Continuing the example, you would multiply 0.0000072 by 5 to get 0.000036. Multiply the product of the expansion coefficient and the temperature increase by the original length of the steel.Mar 14, 2018

How to Calculate Thermal Expansion of Steel | Sciencing

 

https://sciencing.com › calculate-thermal-expansion-steel-2705

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What causes a roof to leak? It was fine ,looks fine?

The big green monster here is thermal expansion. The wind during heavy storms causes general movement. With the settling of all the components that make up a home roof, both material wise and the foundations which are earth bound,  these have constant movement adds to the dilemma of the roof shift and the thermal expansion properties is why a roof deteriorates and needs maintenance..

Interesting Roof Data & Stresses It Causes

The graph above shows what difference just the color of a roof tile makes. This is important because as the roof experiences the effects of the thermal expansion so do the different components that make up the roof.

Roof Ridge Mortar: The biggest enemy of the mortar is the constant movement of the tiles and roof structure. The ridges crack and require maintenance as required - all roofs differ. Causes, heat, damage from hail and truss related movements.

Underlay- As the rooftop heats up so does the inner section. An original underlay is a plastic-based unit that perishes due to it losing elasticity and moisture -simply cracks and falls apart.

Barge | Fascia Boards - Theses generally protect the truss ends and on lean-to roof play a crucial part in not letting water in from the high side. Hail wind and the movement that comes from them are a constant issue requiring upkeep and an annual nip and tuck essentially

Mechanical Repair Approach/ 5yr Guarantee  This is where we would completely strip the area or section where the leak is and from the bones up replace what initially caused the leak and rebuild by the book tile the top side.

waterproofing / 2yr Guarantee. This solution is a temporary solution and is a quick fix should finances not permit the more costly repair. This entails a cold-rolled application of an acrylic-based membrane approach which at best lasts 2 years, but does buy the homeowner time financially.

Fix A Roof (PTY)ltd Fixing Roofs The Right Way