Liquid Waterproof GRP Fibreglass Coatings DVC Roofing & Building North East

Liquid Waterproof GRP Fibreglass Coatings DVC Roofing & Building North East

brochure as a PDF

Benefits of Liquid Waterproof Coatings

An alternative to Lead and Copper

Liquid Kemperol can be installed anywhere where lead and copper would normally be specified. Whether you are replacing old and fatigued lead, specifying new lead on a particular project or worse, where the lead has been stolen, Liquid coatings is the obvious choice.Liquid coating can be coloured to look like lead. It can even have simulated rolls incorporated. There is no need for steps and welds on long gutters and Liquid coating can be installed either flat or with a fall.

Specification Options

Typically, systems include a primer, layers of the waterproofing liquid, a reinforcing fibre layer and a protective top layer. Systems may comprise one or several coats. Waterproofing systems are predominantly based on three materials, bitumen, polyester and polyurethane, as detailed below. Other liquid-applied waterproofing systems include formulations based on rubber, acrylics and silicones.

Modified bitumen

Bitumen is modified by substances such as natural rubber or styrene to make it more resistant to fatigue movement failure. Two or more bitumen solution or emulsion layers are applied to a total thickness of 3-6 mm or greater. Expected service lives vary between 5 and 10 years.

Polyester-based systems

These are glass-reinforced fibre systems. Resilient types are applied to plywood or similar substrate. Flexible types are applied to existing substrates. The system is 2-3mm thick. Expected service lives are between 20 and 30 years.

Polyurethane-based systems

All polyurethane systems are tolerant of moist laying conditions. Thickness of system is 0.6-2 mm. Expected service lives are between 10-30 years.

Durability issues

Liquid Waterproof GRP Fibreglass Coatings DVC Roofing & Building North East

The material factors that influence durability are complex and related to the chemical composition of the liquid constituents, the thickness of the system as well as the type and density of the reinforcement. Central to the long-term success of liquid-applied waterproofing systems is preparation of the substrate and achieving the required membrane thickness.

Typically, manufacturers only guarantee their products when applied by approved and trained installers. This is not surprising as standards of application by squeegee, roller, brush or spray are very demanding; layers are measured to tenths of a millimeter and avoidance of air holes is essential. The weather conditions in which the liquid is laid are critical as are the times between applications of coats.

Other key durability issues include:

  •  Ensuring the substrate construction and condition is free from material which may impair the bond, create thin spots or penetrations in the coating.
  •  Provision for moisture removal of damp substrates.
  •  Ensuring there are no point loads on the roof.
  •  Specifying a system suited to the expected traffic load.

Appropriate detailing at edges, verges, up stands, outlets, movement joints and day joints.

Liquid-applied coating that forms the waterproofing layer of an inverted roof should not require replacement during the life of the building, provided it is fully protected from ultra-violet radiation and extreme temperature variations by a loading layer above it. When the roof covering is installed tests may be carried out to confirm its waterproofing capacity.

Call DVC Roofing now on 0191 410 3680 for a GRP quote

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