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The use of Firespray® in the fire protection of steel floor trays

Firespray® consists of slag wool, with hydraulic and inorganic binders. It is supplied in the form of light flakes.
The thickness of the fire protection coating varies between 21 and 69 mm.
Beam height must be at least 120 mm.

The assembly involves placing M48 spacers directly on the bottom flanges of the structural beams at right angles with a maximum spacing of 600 mm. Screw-fix an expanded metal sheet, type Nerfloc, and apply Firespray® to the desired fire protection rating.

Fire protection of steel floor trays

The application technique of Firespray®

Firespray ® is a spray-on product. The spraying technique, also known as flocking, consists in applying Firespray® fibres under pressure, using a special machine. The thickness of the sprayed layer will be defined according to the desired fire resistance rating. The spraying machine comprises a feed hopper, a carding device, a blowing device (fan, turbine or blower), a hose for conveying the mixture to be sprayed. The Firespray ® mixture is then applied with a spray gun. The product is placed in the machine, then fed into the spray gun by means of compressed air. Water-fed nozzles are placed around the hose outlet to wet the product before it is sprayed onto the substrate. Firespray® does not require prior application of a bonding agent. The coating will be finished with Projiso Fixo Dur® or Sidairless®. Projiso Fixo Dur® is a spray-on product that can penetrate the fibrous coating to a depth of up to 15 mm. The Sidairless® coating is applied using pumps for spray-applied coatings. The product can be churned in a mixing turbine.

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