Tremco AUS

      Special thanks to Tremco .

 

Wolfin PVC Membrane

 

 

 

 

 

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HOW TO SELECT A WATERPROOFING MEMBRANE
Waterproofer Sydney. Check for the following properties of the membrane:
UV Stability – if the membrane is to be exposed to the sun, than it must be UV stable or UV resistant, else it will degrade over time.
Elongation – this is the ability of the membrane to stretch. It is measured in percentages. An elongation of 150% means that the membrane can stretch to 1.5 times its length when pulled. Elongation is a must in buildings that will move, such as high-rise buildings, or buildings made with steel, which is flexible. This property will allow the membrane to stretch over cracks that may develop in the future. Membranes with elongation properties of over 200% are available.
Breathability – one disadvantage of good waterproofing is that if water does happen to enter into the structure from a point and spread across a surface, that water is trapped inside the structure, and cannot get out. Breathable membranes help to release that water to the air in the form of water vapor. So some membranes are designed to prevent water from passing through them, while at the same time allowing water vapor to pass through. So over time, breathable membranes allow trapped water to evaporate into the atomosphere.
Tear Resistance – this is an important property, as many membranes that have good elongation also can tear easily. Take a small sample of the material in your hand, and try and tear it into two pieces. This gives a fair idea of its tear resistance. You are looking for a membrane that will not tear even if a reasonable force is exerted on it.
Abrasion Resistance – this is the ability of a membrane to withstand wear and tear. As most membranes are covered concrete screeds and tiling, the abrasion resistance comes into play during the construction period, when workers are walking on the surface, dropping nails and screws, and scraping hard objects like rebar against the membrane, which can damage it. A very soft membrane with low abrasion resistance may get damaged in such a situation, which can cause it to leak.
Chemical stability – check that the membrane is chemically inert with respect to its environment in the building. Some membranes, especially outside basement walls, are exposed to the soil and rainwater outside.
Food Safety – membranes can be applied to the inside of concrete water tanks to make them waterproof. In this case, the membrane must be food safe, as the water is in contact with the membrane.
Geometry – if a membrane has to be installed over a complicated shape, such as the junction of a column and beam, then a liquid applied membrane is preferable, as it can be applied to any type of underlying shape or structure. A sheet membrane would form folds and creases and leave gaps between the underlay and membrane.
Case Studies – ask the manufacturer or contractor to give you case studies where the membrane has been used. Ideally, it should have been in place for over eight years. Check with the building owners to see if any leakage or problems have occurred.

Sheet membrane: As the name implies, these are membranes that arrive at the site in the form of rolls. These are then unfurled and laid on a firm surface. The most common type of sheet based membrane is a bituminous waterproofing membrane. This type of membrane is stuck to the substrate with a hot tar based adhesive using blowtorches.
Joints between adjacent membranes are also made with the same hot adhesive. The sheets are overlapped by about 100mm (4″) to form a waterproof joint. Some membranes are even joined by melting them with a hot air gun and then overlapping them on the previously laid sheet.
With this type of membrane, joints between sheets are critical, and must be done perfectly to avoid leakage.
Other types of sheet based membranes are PVC membranes and composite membranes. The latter have a fabric base that provides strength and tear resistance, and a chemical that coats the fabric to provide resistance.
Since these membranes are factory-produced excepting the joints, they are consistent in quality.
Liquid membrane: Liquid applied membranes come to the site in liquid form, which are then either sprayed or brush-applied on the surface. The liquid cures in the air to form a seamless, joint-free membrane. The thickness can be controlled by applying more of the liquid chemical per unit area.
Since the application procedure is very quick, a contractor will try and finish the entire area to be waterproofed in a single day to avoid cold joints. However, if a very large area is to be done on successive days, cold joints can easily be done by overlapping the new membrane over the old – the chemical will stick to itself readily.
These are generally considered to be superior to sheet based membranes as they are joint-free. However care must be taken in application to provide just the right thickness. The membrane can tear or break if it is too thin. The adhesion of the membrane to concrete must be good.
If a concrete screed (layer) is to be applied over a waterproofing membrane, the membrane is made rough by sand broadcasting. This is throwing a thin layer of sand by hand over the wet membrane (before it has set fully) so that the sand sticks to the membrane and provides a rough surface the concrete can adhere to