Stiff sheet waterproofing is a type of water barrier made from metal or polymeric sheets that fasten to the building envelope. These sheets are fastened using adhesives, screws, pins, or welding. Stiff sheet waterproofing also works with liquid materials, such as plastic or synthetic resins. Various paints that are used in waterproofing are also composed of plastics.
Polymeric or metal sheets
Metal and polymeric sheets can be used for waterproofing purposes. The two materials are different in their properties and the choice depends on the requirements and application of the project. In general, waterproofing products are selected based on the climatic and geographical conditions of the country. Therefore, the waterproofing material used in Kenya will be different from that used in Canada.
Polymeric sheets are more durable and can last longer than metal sheets. They are available in various types and are often reinforced with glass fiber or polyester. The strength and elongation at break of polymer sheets are important in determining their performance. They can also be manufactured in different shapes and sizes.
Polymeric sheets are more expensive than metal sheets, but they are the best choice for certain situations. Polymeric waterproofing membranes have adjustable density and are used to protect the exterior of a structure from water. Ideally, the density of polymeric sheets is 1.2 grams/cm3 or more.
Spray applied membranes
If you are in the market for a stiff sheet waterproofing membrane, it’s best to do your research. You’ll want to find one that has good tear resistance and is made of an asphaltic rubber composition. Another important property to look for is elongation, which is how easily a waterproof membrane will stretch when stretched. To test this out, simply tear a small piece of a sample in your hand.
Spray applied membranes are available in two types: plastic and bitumen-based products. Those designed for outdoor applications should be UV resistant. They should also be covered to protect from sun exposure. Spray applied membranes tend to be more durable than sheet-based membranes, which are usually prone to blistering and re-emulsification.
The most widely used waterproofing material is polymer-bitumen roll-fed sheet membranes. They can be used on flat and pitched roofs as well as vapor barriers. Polymer-modified bitumen sheet membranes provide added flow resistance and are particularly useful in hot climates. They are usually covered with special graphic elements or a polymer film.
Roll-fed membranes are ideal for water proofing buildings and structures. They can be installed by using a manual or mechanical fastening system. During installation, the membrane is positioned over the stiff sheet and rolled or rubbed to a smooth surface. Ensure that the membrane extends four-half inches beyond the corner and is secured with a POINTING MASTIC.
Roll-fed membranes are available in various thicknesses and materials. Most types are about 2 to 4 millimeters thick and are categorized as either liquid-applied or sheet-based. Ideally, the waterproofing membranes should have high tear and UV-stable properties and be flexible enough to fit over the sheet or wall.
Before installing a roll-fed waterproofing membrane, you must verify the manufacturer’s credentials. They should be able to provide references from past projects and a comprehensive set of standard details. Also, ensure that they have a warranty on their waterproofing components.
Stiff Sheet WaterProofing is an excellent method of protecting a building envelope against water penetration. It is composed of a thin layer of polymeric or metal sheets that are affixed to a building envelope using screws, glue, or pins. Stiff sheet waterproofing is also available as waterproofing films that are applied to a building’s exterior. Stiff sheet waterproofing paints use synthetic resins and plastics to prevent water from penetrating the building envelope.
The application process of waterproofing membranes is fast and easy. In large areas, contractors may do the entire job in one day. In addition, large areas can be covered on successive days. The advantage of membranes is that they do not cause cold joints, which are common with sheet based membranes. However, it is important to ensure the proper thickness of the membrane. If it is too thin, it may tear or split. Also, it must have good adhesion.
FIG. 10 illustrates an exemplary assembly of stiff sheet waterproofing. The stiff member is made of extruded metal or synthetic plastic and is double wrapped to reduce stress and prevent tearing of the membrane. Corner 138 is another area that is likely to experience high stress, so two layers of membrane 134 are provided in this area to increase tear resistance.
The stiff member is attached to the membrane portion 46 using an adhesive 26. Alternatively, the membrane portion can be attached with screws or other fasteners that penetrate the building structure. Regardless of its type, the fasteners should be strong enough to anchor the membrane perimeter to the wall structure. This way, the installation will be more robust and the system will last for a longer time.