Does intumescent paint need primer?

All structural steel to be coated with CAFCO^® SprayFilm^® / ISOLATEK^® Type Intumescent Coatings must first be primed with an approved primer. The primed surface must be free from any grease, oil, dirt, loose mill scale, rust or any other contaminant that would inhibit the bonding of the product to the primer.

Can intumescent paint be painted over?

The short answer is yes, you can paint over it.

What is intumescent primer?

Intumescent Coatings

This 'inhibitive' primer chemically reacts with the steel work to form a corrosion resistant suface and can be used in both internal and external environments.

Can you roll on intumescent paint?

Some intumescent paint is just like regular paint and can be applied using a sprayer, a brush or roller.

How do I use intumescent?

For speed and quality of finish, intumescent coatings are preferably spray applied with airless paint equipment. Brush and roller application may also be possible. Spray, brush or roller applied intumescent paint. Spray, brush or roller applied topcoat (if necessary).

What Is Intumescent Paint- Fire Resistant Paint and When Do You Need It?

How is intumescent fireproofing applied?

Next, the intumescent base coat is applied to the primed steel substrate to the required thickness. This layer provides the fire protection to the structural member. Finally, a decorative and protective top coat may be applied over the installed intumescent coating.

Does intumescent paint expand?

Thin-film intumescent coatings will expand at a rate of 50:1, as a general rule of thumb. This means that a 1mm coating will reach an estimated density of 50mm in the event of a fire. Thick film coatings expand at an approximate rate of 5:1.

How do I get a smooth finish with intumescent paint?

How long does it take intumescent paint to dry?

Apply a top coat – the top coat protects the intumescent coating from the harsh effects of the environment. This should be left to dry for 24 hours.

Can I spray intumescent paint?

Intumescent paint can be applied directly onto the surface of timber structures, either by brush, roller, or spray.

Can intumescent paint be applied on site?

Intumescent coatings are often specified to be applied onsite after the steel has been erected. The advantages of an onsite application are: No transport or handling damage.

Can intumescent paint be applied to Galvanised steel?

Finally, intumescent coatings can be applied on galvanised steel, as long as this has been properly cleaned and all the grease has been removed.

How thickness is intumescent paint for 2 hour rating?

2 hours structural steel fire protection at less than 1mm thickness of an intumescent coating system.

Can you paint over fire stopping?

A single-part, sag-resistant, water-based acrylic latex sealant, 3M Fire Barrier Sealant FD 150+ has excellent adhesion characteristics to most common construction materials. And, since it dries to the touch within one hour, it can be painted for a more professional-looking job.

Can you paint over fireproofing?

The paint should be applied over the material with the minimum amount required so as to avoid saturating the material. UL has approved this application of painting SFRMs and confirms that it will not adversely affect the fire resistance rating.

Does intumescent paint work on wood?

Intumescent is used on many wood surfaces, including soft and hardwoods, OSB, Plywood, doors, paneling, cladding, Gypsum, and most other combustible substrates.

Do steel beams need to be fireproofed?

If the beam is steel then it should normally be protected against fire so that it will have 30 minutes resistance to fire (if measured in a standard test).

Why does steel need intumescent paint?

Steel: Intumescent steel paint is designed to increase the time period that a structural load bearing steel within a building will last during a fire. The paint works by intumescing or expanding to create an insulation barrier on the steel and increasing the time period to 60, 90 or 120 minutes.

How much intumescent paint do I need?

Allow 8 square metres per litre per coat for Timbercoat Intumescent Fire Paint - a 2.5 litre can will cover approximately 20 square metres per coat. Allow 8 square metres per litre per coat for Flame Retardant Paint when applying only one coat - a 2.5 litre can will cover approximately 20 square metres per coat.

How thick is intumescent paint?

The effectiveness of an intumescent fire resistive coating depends on the coating thickness and its ability to retain the ash layer. Coating thickness typically ranges from 30 to 500 mils (0.8 to 13 mm).

Does intumescent paint provide integrity and insulation?

Providing certain criteria are met, both systems are capable of providing not just Class B (Class 0&1), but 60-minutes protection to exterior timber cladding and 30-minutes insulation, integrity and load-bearing capacity to timber beams and floors.

At what temperature does intumescent paint react?

Intumescent paint reacts when its temperature attains or exceeds 120°C, and the process results in a soft charring effect at its surface (which insulates and reduces transmission of heat into the substrate) and the release of water vapour (which helps to cool the substrate).

How much space does intumescent paint need to expand?

The intumescent paint's DFT can expand by up to 50 times its original thickness into a soft, light char. When fully expanded, the char will form an insulation barrier to protect the steelwork. Uncoated steel takes between five and 15 minutes to reach the critical core temperature.

Is intumescent paint fireproof?

Intumescent coatings, often referred to as intumescent paint, are used in buildings as a passive fire resistance measure. They can be applied to structural members as an aesthetically pleasing fireproofing product.

Can intumescent paint be applied to concrete?

The application of AITHON A90H to structural concrete substrates can provide up to 240 minutes fire protection by using calculations that determine the thickness of the intumescent coating to be applied to achieve the equivalent in concrete thickness (cover).