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Commercial Roofing – Liquid Waterproofing Systems

Surveying Advice

Which commercial roofing system?  

Liquid applied waterproofing systems on Commercial Roofs are applied without the use of heat. They are versatile and adaptable and can be applied under low-lying plant and around complex and detailed roof areas. The material seals to itself and so the finished roof is seamless. Some systems remain micro-porous so that trapped moisture can escape from damp substrates. The material is delivered to site in 15Kg drums so that it can be transported to the roof and stored easily. This may enable existing service lifts to be used on tall tower blocks rather than requiring the erection of an external scaffold tower and hoist.

Most liquid applied products also provide options for the application of anti-skid and walkway systems. Because the liquid system bonds to itself, if future adaptations to plant and services require perforations to be made in the roof finishes, they can be easily waterproofed without effecting the warranty, provided the original contractor is retained to carry out the adaptation. This property also means that when the system is approaching the end of its working life (i.e. the surface coating is almost worn out) it is usually sufficient to clean the surface, apply a primer and simply apply another top coat, rather than apply the whole system. Provided the building is well managed and this opportunity is taken, it can greatly reduce the cost of the roof waterproofing over the life-cycle of the building.

Where there is concern over the use of heat or naked flames these cold applied applications can provide an excellent safe option, perhaps allowing work to be carried out while the building is still occupied rather than out of hours; again reducing cost and inconvenience to the client. Different liquid applied systems use a variety of different products as reinforcement. These are usually variants of two products, glass fibre and polyester. Polyester reinforcement is tough and durable, making it ideal for use on car parks, communal balconies and walkways. However, polyester is very rigid and is less able to be dressed to form complex details and in these cases glass fibre is usually a better solution.

Traditionally liquid systems are laid over the existing waterproofing, which can offer significant cost savings and environmental benefits. It also reduces the risk of water ingress while the works are being carried out. However, this should only be considered where the existing waterproofing is in good condition and where there is no risk of its failure effecting the long term performance of the system.

Want more information on how Liquid Roofing Systems could suit your commercial roofing needs? With over 40 years’ experience in the commercial roofing market, Maguire Brothers offer a variety of roof surveys, ensuring you’re able to make the right decision for a new liquid roofing system.