Application of Spray Applied Fireproofing

Spray fireproofing must be done according to the manufacturer’s instructions in order for proper adhesion and fire ratings.

Preparation

SFRMs must be applied after careful preparation of the substrate and in a safe environment.

Unless otherwise recommended by a manufacturer, a minimum ambient temperature of 40F (4C), is necessary at least 24 hours before, during, or after SFRM application. In most cases, natural ventilation is acceptable at a rate of four air changes per hour or more. You will need to have access to electricity and water, as well as protection and cover for any materials that are not being received.

Before applying, the SFRM contractor must inspect substrates and make sure that the following steps are taken:

• Cleanse surfaces of oil, grease and loose mill scale.
• Clearance of all lubricants and rolling compounds from steel decks
• Attachments are required to enter the fireproofing.
• Concrete placement on metal flooring decking should be completed to prevent future deflections that could lead to SFRM deterioration.
• Installing roofing and tightening, penthouses complete, and mechanical units placed on the underside of a metal roof deck. Roof decks made without concrete should not be loaded in order to prevent deflection following application of the SFRM.
• When the manufacturer of SFRM recommends it, adhesive or primers should be used.

Spray Application

SFRM can be sprayed using a Dry Spray or Wet Spray system according to NFCA100.

Wet spray SFRMS are made from water and slurry. This slurry is then passed through a pipe and dispersed through a tube. This can reduce installation time by between 10 and 15% per day.

Dry spray SFRMs have been conditioned using application equipment. Then, a pneumatically passed hose to the nozzle where atomized waters are introduced. Spray is directed at the substrate, and then applied in an even-paced pattern. If severe weather conditions are present, dry spray systems can be used.

Troweling SFRM onto the required areas is another method. To ensure complete SFRM coverage, this should be done after each area has been sprayed. To patch any damaged or loose areas, the troweling technique can also be used.

Patching

SFRM should be removed from areas that have not been approved by the manufacturer. To maintain the building’s approved UL design, and fire resistance rating, it is essential to use the same material or a compatible material.

The fireproofing is usually done immediately after the structure has been built, but before any MEP systems are installed. Beam clamps are required for the installation of pipes or ductwork. This requires that fireproofing be removed. It is crucial that the contractor return to fix the SFRM installation.

Maintenance

SFRMs don’t require any maintenance. However, property owners should inspect fireproofed areas periodically to make sure that the SFRM material isn’t damaged. It should be replaced immediately if it becomes loose, cracked or damaged.

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