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Once damp has become a problem in your building, you may begin to notice the following physical defects. Be sure to Contact Us to arrange your free professional damp assessment.

Damp proofing is a material that resists the passage of water with no hydro-static pressure and waterproof as a treatment that resists the passage of water under pressure. Generally damp proofing keeps moisture out of a building where vapour barriers keep interior moisture from getting into walls. Moisture resistance is not necessarily absolute: it is usually defined by a specific test method, limits, and engineering tolerances.

Damp proofing is accomplished several ways including:

A damp-proof course (DPC) is a barrier through the structure by capillary action such as through a phenomenon known as rising damp. Rising damp is the effect of water rising from the ground into your property. The damp proof course may be horizontal or vertical. A DPC layer is usually laid below all masonry walls, regardless if the wall is a load bearing wall or a partition wall.

A damp-proof membrane (DPM) is a membrane material applied to prevent moisture transmission. A common example is polyethylene sheeting laid under a concrete slab to prevent the concrete from gaining moisture through capillary action. A DPM may be used for the DPC.

Integral damp proofing in concrete involves adding materials to the concrete mix to make the concrete itself impermeable.

Surface coating with thin water proof materials for resistance to non-pressurized moisture such as rain water or a coating of cement sprayed on such as shotcrete which can resist water under pressure.

Cavity wall construction, such as rain screen construction, is where the interior walls are separated from the exterior walls by a cavity.

Pressure grouting cracks and joints in masonry materials.

Masonry construction

A DPC is a durable, impermeable material such as slate, felt paper, metal, plastic or special engineered bricks bedded into the mortar between two courses of bricks or blocks. It can often be seen as a thin line in the mortar near ground level. To create a continuous barrier, pieces of DPC or DPM may be sealed together. In addition, the DPC may be sealed to the DPM around the outside edges of the ground floor, completely sealing the inside of the building from the damp ground around it.

In a masonry cavity wall, there is usually a DPC in both the outer and inner wall. In the outer wall it is normally 150 millimetres (5.9 in) to 200 millimetres (7.9 in) above ground level (the height of 2-3 brick courses). This allows rain to form puddles and splash up off the ground, without saturating the wall above DPC level. The wall below the DPC may become saturated in rainy weather. The DPC in the inner wall is usually below floor level, (under a suspended timber floor structure), or, with a solid concrete floor, it is usually found immediately above the floor slab so that it can be linked to the DPM under the floor slab. This enables installation of skirting boards above floor level without fear of puncturing it. Alternatively, instead of fitting separate inner and outer DPCs, it is common in commercial house building to use a one-piece length of rigid plastic, (albeit an angled section), which fits neatly across the cavity and slots into both walls (a cavity tray). This method requires the need for weep vents to enable rainwater ingress to drain from the cavities otherwise rising dampness could occur from above the DPC.

 

Concrete walls and floors

Concrete normally allows moisture to pass through so a vertical damp proof barrier. Barriers may be a coating or membrane applied to the exterior of the concrete. The coating may be asphalt, asphalt emulsion, thinned asphalt called cutback asphalt, or a rubber polymer. Membranes are rubberized asphalt or epdm rubber. Rubberized products perform better because concrete sometimes develops cracks and the barrier does not crack with the concrete.

There are many solutions for dealing with dampness in existing buildings, the choice of which will largely be determined by the types of dampness that are affecting the building (e.g. rising damp, hygroscopic damp, condensation, penetrating damp etc…).

Damp proofing in construction is a type of moisture control applied to building walls and floors to prevent moisture from passing into the interior spaces. Damp problems are one of the most frequent problems encountered in homes.

Impact Damp an established damp proofing specialist provides premium quality damp proofing solutions to the residential, industrial and commercial property sectors.

Our quality damp proofing materials, exceptional standards of service and professional team will guarantee that you receive the high standard of workmanship that you expect from a damp proofing specialist contractor.

We have a close working relationship with our suppliers including, XYPEX, STONCOR and HERMETIC.

ROOF REPAIRS

Roof Repairs, Roof Waterproofing and Torch-on.

Best Roof Repairs, Waterproofing, Roof Waterproofing, Waterproofing Roof, and Maintenance of all roof types. Roofs are equally as important as any other part of your home or business especially when it comes to waterproofing your home or business.

The best practice for roof maintenance is an inspection of your roof every 3 years, even if you don’t detect a leak. Broken tiles, perished waterproofing membrane, cracked tiles, rusted screws and bolts and sun damaged can leave your roof vulnerable to water damage, leaks and open to nesting insects such as termites who love damp wood, structural damage from rotten timber and an easy target for criminals who see an easy entrance to your home or business.

We repair roofs. Leaking roofs, damaged roofs, sagging roofs, Rotting timber and more. We specialize in Roof Repair and Roof Waterproofing.

Free site surveys, punctual and friendly skilled operatives and the ability to work to strict deadlines sets Impact Damp apart from other specialist waterproofing contractors.

Single-ply and fluid-applied roof waterproofing using the most advanced technology on the market is a speciality of Status Waterproofing.

We are an approved quality assured contractor for the application of numerous systems, offering complete peace of mind to the client.

Impact Damp offers a full-service residential and commercial waterproofing service that has served clients all over Gauteng. Our experience and technology allow us to meet and handle your needs quickly and accurately.