Waterproofing Services

Thermal imaging

Moisture and Leak detection

Moisture can destroy a building’s structural integrity and nurture mold. The first step in moisture mitigation is to quickly and accurately locate and remove all sources of moisture. Our thermal  imaging and infrared cameras instantly show you what’s wet and what’s dry.

Infrared cameras can instantly find the source of a leak with little or no physical disassembly of the premises and minimal disturbance to the occupant. This technology instantly captures and records high resolution thermographic images which can be downloaded to a PC or other device. Infrared thermography pinpoints the source of the moisture, provides definitive Cause and Origin data, and prevents incipient catastrophes. Approved Waterproofing specializes in moisture detection services, to prevent catastrophic water damage to your home or business.

Concrete Slab / Torch On

When waterproofing a concrete roof, we apply a mineral stone torch on bitumen system. This system is applied to flat roofs and subterranean areas like building foundations. The torch on system fuses the material to the underlying surface.

Mineral stone torch on, is a prefabricated material made of bitumen distillate modified with elastomeric and plastomeric polymers, the product is reinforced with a dual carrier spun bound, non-woven, polyester filament, stabilized with fiberglass. The mineral stones on the material protects it from the sun and ensures that the installed product is UV protected.

When applying the membrane, the applicator must first ensure that the surface is clean and dry. The next step is to apply the primer, and only when the primer has dried, can the membrane be placed on the roof and adhered with heat. To ensure uniformity, chalk lines are used.

We always start from the lowest point of the roof, nearest the drainpipe. The membrane is staggered to ensure overlaps are positioned and sealed correctly. The last step is to waterproof the drains and all corners, to validate the manufactures warranty.

This system carries a 10-year, maintenance free warranty, subject to there being no 3rd party interference.

Concrete Roofing and Decks
Tile roof waterproofing

Pitched Tiled Roofs

Tiled Roofs have a cosmetic look and should always be neat and tidy. When a tiled roof starts to leak, we apply waterproofing under the tiles which consists of a white 250-micron plastic lifelong product.

If your ceiling shows signs of discolour this is probably due to there being no plastic under your roof tiles, the plastic fitted incorrectly or damage to this plastic by a third party i.e. plumber, electrician, DSTV cables.

To repair the above, tiles and wood must be removed, and a 250 Micron plastic needs to be installed and fitted. This is the only way to successfully repair a tiled roof and there is no maintenance needed as it is covered by the tiles and additionally there is no UV sun rays effecting the product.

Research has shown that, in homes built over the past 50 years, 50% were not supplied with the correct 250 Micron, lifelong, SABS approved plastic, and many others were not fitted correctly or had no plastic at all.

Corrugated and IBR Roofs

Corrugated and IBR roofs, while cheaper to install, have historically created massive problems for clients. If the roof was not designed or installed correctly, water pools, resulting in leaks and rust.

IBR roof sheeting is a square fluted profile with an effective covering width of 686mm, designed for use as side cladding or roofing material in commercial, industrial and residential buildings. The name IBR is abbreviated from “Inverted Box Rib” and has become a household name in the African building industry.

Both IBR and Corrugated metal roofs are vulnerable to excessive moisture and damage from strong winds. The individual panels are attached to wood or metal trusses with steel nails or screws that can rust and cause leaks. Strong winds can separate the overlapping edges of the panels and cause the roof to leak. Fixing leaks on an IBR or corrugated metal roof, starts with locating the source of the leaks. From there, the method used to fix a particular leak depends on the cause.

Bondflex Liquid Bitumen, when applied correctly, is very effective in waterproofing both Corrugated and IBR roofs.

Bondflex is effective in bridging hairline cracks and offers long term protection for your roof.

Usually, all the screws and gaps are sealed and then bondflex is applied.

Where necessary and when Bondflex will not be an effective waterproofing solution, a boarding system may be applied over the Corrugated or IBR roof. This option is more expensive, but does have long term positive results. Boarding systems carry  a 10 year warranty if serviced every 2 years and there is no 3rd part interference.

Once the Corrugated or IBR roof is waterproofed, we offer a painting service to make the roof uniform in colour. The painting is for aesthetics only, and is not considered an extra waterproofing agent.

waterproofing in Johannesburg
Rising damp

Rising Damp

When a property has signs of plaster and/or damaged paint on areas above the ground wall with a maximum of under 1 meter, this is a sign that there is rising damp. The damage can be costly and cause depreciation of your home or commercial property.

Rising damp must be dealt with before any deterioration to the walls commences.

Approved Waterproofing offers the highest quality products recommended for construction and renovations. Our process involves the removing the plaster and then applying the correct products, in the right order, to prevent rising damp re-occurring. Our system is 100% effective, comes with a warranty when applied by our highly trained staff.

Identify Rising Damp - Misdiagnosis

It is not uncommon to hear of rising damp being misdiagnosed. Many individuals, inexperienced in identifying rising damp issues, may assume that the usual tell-tale sign of a tidemark on the wall is in fact rising damp. This may not always be correct. 

Before making a hasty decision, please consider the following :

Peeling Wall

Look out for wallpaper coming off or peeling from the wall. You will most likely notice it coming loose from the skirting board first with the corner of the wallpaper turned or curved up.

Decayed Skirting Boards

Salts in the form of white fluffy deposits in the plaster similar to the images above. These salts are washed out of your bricks and into your plaster leaving what can look like blistering patches on your walls.

Black Mould

If you see black mould appearing above your skirting board it is a clear sign that there is some form of dampness affecting the area, especially if you have no other evidence of black mould within the property and the black mould is localised from the skirting board to up to 1 metre above the skirting.

Tide Marks

One of the most common tell-tale signs are tide marks left on walls. Tide marks are caused by evaporation and salts from the ground. You will normally notice them anywhere up to 1 meter above the skirting board. If you do not notice tide marks, another very common tell tale sign is damp patches or staining. Typically, these damp patches are yellowish or brownish in colour and similar to tide marks, you will notice them up to 1 meter above the skirting board.

Quick tips to Identify the Leak

  • Water Damaged ceiling – yellow marks or brown marks
  • Water dripping from lights or area in the ceilings.
  • Please note, you won’t be able to see any leaks or damp issue beneath tile or plastic
  • Usually, if it is an isolated incident (example if leaking in a specific area in a room, a third party like DSTV installers have been involved, they can damage the plastic while working in the roof)
  • If your roof is leaking in random areas – generally either no waterproofing material was applied or non-SABS products were installed.
waterproofing for roof