Head Office: 

By Simon Heath 

Intumescent Paint 

We thought it would be helpful to put together a blog, with a view to running through some of the more frequently asked questions or queries with regards to intumescent paint application. During the pre-construction process we utilise a pre-commencement checklist to start conversations about the below and much more. 

Intumescent Paint Application & Bolt Preparation 

In line with the manufacturer guidance, when applying a water based intumescent paint to structural steel work, it is important to prepare any steel that has been galvanised. This process includes the degreasing and priming of any galvanised steel, and leaves the substrate in a condition ready to receive treatment. 

Protection of surrounding areas 

Due to the installation nature of intumescent paint, and the usual site installation environment. It isn’t uncommon to experience some drift of paint particles during the installation process. It worth considering whether the surrounding surfaces need protecting, or whether any drift will be removed by a following trades, thus making protection not a requirement. 
A ‘carding’ methodology can be used to minimise the risk of overspray onto adjacent surfaces, such as concrete soffit or block work wall. But unfortunately carding will not take away the risk of drift due to climate conditions. 

Attachments to your steelwork 

During the project build it is likely that various items maybe attached to the treated steelwork. 
It is worth considering this and the below set of drawings, as it is likely that this work will need to be interfaced with other trades, and may affect programme. 


It’s worth considering how the product will look once the installation has been handed over. The NBS clarifies what to expect from a basic installation of intumescent paint. 
• Reasonably smooth and even. Orange peel, other texture, minor runs and similar minor defects are acceptable. 
• Good standard of cosmetic finish generally, when viewed from a distance of 5 m or more. Minor orange peel or other texture is acceptable. 
• High standard of evenness, smoothness and gloss when viewed from a distance of 2 m or more. 


For more information about our services, please fill in the form below and a member of our team will be in touch. 
Tagged as: Intumescent
Share this post:
GRJ Contracting Ltd was established in 2007 with the purpose of specialising in the design, supply, and installation of quality passive fire protection systems for the commercial and residential UK construction market. As an accredited company certified with IFC, ASFP, ISO 9001 and Cyber Essentials based in the Midlands, we operate nationwide on new build and legacy construction projects of all scales and our range of services includes Intumescent Coatings and Rigid Boarding systems for Structural Steelwork protection, Service Penetration Firestopping, Mineral Fibre Boarding systems for internal building fire compartmentation and more. 
Terms of Use | Privacy | Cookies | Copyright © 2024 GRJ Contracting Ltd. All Rights Reserved. Branding by Carl Murch Design. 
Our site uses cookies. For more information, see our cookie policy. Accept cookies and close
Reject cookies Manage settings