What is intumescent fireproofing?
Intumescent paints are considered the lightest form of passive fire protection. An intumescent is a coating that, when exposed to heat, is rapidly transformed through sublimation, and expands many times its original thickness (up to 100 times), to form a stable, carbonaceous char.
How is intumescent paint applied?
Some intumescent paints are best applied using a compressed air sprayer. A compressed air sprayer is a pressurized closed system that allows the intumescent paint to be applied evenly to the entire surface.
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.
What is an intumescent material where is it used?
An intumescent is a substance that swells as a result of heat exposure, thus increasing in volume and decreasing in density. Intumescent materials used in fire protection will increase their volume significantly under the influence of heat (approximately at 200°C).
What material is used for fireproofing?
Common materials used include solid lumber, plywood, OSB, Particle board, gypsum board, cement fiberboard, or glass fiber insulation batts.
What is intumescent coatings for steel?
An intumescent paint is a coating that reacts to heat by swelling in a controlled manner to many times its original thickness, producing a carbonaceous char formed by a large number of small bubbles that act as an insulating layer to protect the substrate.
Does intumescent paint need a primer?
Most of the intumescent paints that are applied on site are water based and will require a full application of the specified primer to avoid delamination due to rust.
How thick is intumescent paint?
30 to 500 mils
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).
How effective is intumescent paint?
Intumescent paint is an integral part of effective passive fire protection system. When exposed to extreme temperatures, it rapidly expands to protect the surface that it’s applied to. This prevents, minimises, or delays fire damage to building structures, ultimately providing time for occupants to evacuate safely.
How do intumescent seals work?
So, how do Intumescent seals work? An intumescent seal is a strip of material fitted around a doorway, that when exposed to heat, expands closing any gaps around the door to stop the fire spreading for a period of time. These seals usually come with either 30 or 60 minute ratings.
How many types of fireproofing are there?
three
The three main types of fireproofing methods are cementitious fireproofing, intumescent fireproofing and firestop fireproofing.
How is fireproofing thickness calculated?
There is a simple formula that is used to calculate the required fireproofing thickness based on the ratio of beam weight to heated perimeter. This is referred to as W/D, where W is the weight per foot in pounds and D is the heated perimeter in inches (not beam depth).
What is intumescent sealant?
Intumescent sealants, also known as fire mastics, reinforce the fire resistance of walls, floors and door frames by sealing linear gap joint seals and metallic pipe penetrations.
Can I paint over intumescent paint?
You can only over paint an intumescent strip which is designed for fire protection.
How long does intumescent paint last?
However, most water-based intumescent paints (once applied in a C1 environment) have a general lifespan of up to 20 years. It’s also worth noting that some types of intumescent paint will require top coats.
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.
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 do I install intumescent seals?
Intumescent Strips & Smoke Seals
- Clean frame with damp cloth, removing dirt and grease.
- Measure the height of the fire door, noting the position of the lock – and cut the smoke seal strip to fit accordingly.
- Before using any adhesive, open and close the door with the seal in place.
Where do you put the intumescent strips?
Intumescent strips are generally fitted into the door frame but are sometimes into grooves in the door itself. If you don’t have grooves in your fire door or frame, you can use a router to make a groove suitable for the intumescent strip.
How thick is fireproofing on steel?
“Specified” Thickness of Fireproofing (SFRM)
requiring spray-on fireproofing are to have a ½″ covering of Cafco.
How is Section factor calculated?
The section factor of an unprotected hot rolled open section, hot finished/formed hollow section or fabricated girder is defined as the surface area of the member per unit length (Am) divided by the volume per unit length (V). It is measured in units of m-1.
Can you paint intumescent sealant?
Easy to apply and suitable for multiple substrates and services. Fast curing – the sealant offers approximately 15 minute tack free time and when fully cured, the sealant can be overpainted.
Does intumescent paint need primer?
For wood applications, no primer is required, but an all purpose acrylic primer is recommended to help limit the initial coat of intumescent paint absorbing into the wood substrate. Alternatively, a thin coat of our product can be applied to first seal the wood, followed by the full mil thickness requirement.
Is intumescent paint expensive?
As intumescent fire resistive coatings can be quite expensive ($4 to $12 per square foot, depending on the application and required rating), measuring the coating thickness can play an important role in controlling the application costs. Proper adhesion is also essential to the effectiveness of these coatings.
What Colour is intumescent paint?
white
Jotun intumescent paints are usually white but they can be painted any colour with an approved topcoat. It is important to adhere to an approved paint system which is backed up by documents that you can show any inspector or building control.