How to Prevent Rust and Corrosion in Steel Framed Buildings

Steel-framed buildings are highly durable and long-lasting. Rust develops when steel is exposed to moisture and oxygen without adequate protection. Rust and corrosion in steel buildings are prevented through a combination of the right coating specification at the manufacturing stage, regular inspection and prompt attention to any damage.

The majority of corrosion problems in steel-framed buildings are avoidable when the right approach is taken from the outset.

What Causes Rust in Steel-Framed Buildings?

Rust forms in steel-framed buildings when steel reacts with water and oxygen. This electrochemical process is known as ‘oxidation’. It will gradually break down the surface of the steel, reducing its strength and eventually compromising the structural integrity of the building if left unchecked.

In a steel-framed building, the most common causes of corrosion are the following:

Moisture ingress 

Water getting into the building through gaps in cladding, poorly sealed joints, or damaged flashings creates the damp conditions that accelerate rust.

Condensation

Where warm, moist air meets cold steel surfaces inside the building, condensation forms. Over time, persistent condensation causes localised corrosion on internal steelwork.

Damaged protective coatings

Scratches, chips, or abrasion that break through the protective coating on the steel expose bare metal directly to the atmosphere.

Chemical exposure

Agricultural environments expose steel to ammonia and other corrosive gases, and industrial sites may have chemical vapours. These all accelerate corrosion beyond the standard rate.

What Coatings Protect Steel Buildings Against Rust?

Preventing rust in steel-framed buildings starts at the manufacturing stage with the right protective coating on the structural frame. 

• Epoxy primer and topcoat systems. Two-coat or three-coat systems applied to the fabricated steel frame. The primer provides adhesion and corrosion inhibition, and the topcoat provides weather resistance and colour retention.
• Plastisol-coated cladding. The cladding sheets used on steel buildings have an applied plastisol coating. This coating bonds to the steel substrate and provides durable protection against weathering, UV and surface moisture.

At Kit Buildings Direct all structural steelwork is manufactured in our Derbyshire workshop to UKCA mark standards. Our standard specification includes protective primer on the structural frame and plastisol- or box-profile-coated cladding on the roof and walls.

Why Does Installation Matter for Preventing Corrosion in Steel Buildings?

A poor or inadequate installation of a steel-framed building creates gaps and weak points that allow water to penetrate the building envelope. Once water gets in and has no easy route out, it creates the conditions for corrosion to form.

The most common installation-related corrosion risks are:

• Poor sealing at flashings and junctions: Gaps where roofs meet walls, cladding overlaps or openings are formed can let water in if not sealed correctly.
• Incorrect fixings: Using the wrong fixings or poorly sealed fixings can trap moisture around penetration points, leading to localised corrosion.
• Inadequate ventilation: Limited airflow allows condensation to build up inside the building, increasing the risk of internal corrosion on the steel frame.
• Poor base detailing: If the cladding base is not properly detailed, water can pool or become trapped at ground level, accelerating corrosion at the lowest point.

At Kit Buildings Direct, we offer a full installation service carried out by our experienced team. Using our own team for installation means the building is erected to our own standards, with all sealing, flashing and fixings correctly detailed. View our completed projects gallery to see the standard of finish we deliver.

How Do You Maintain a Steel Building to Prevent Corrosion?

Maintaining a steel-framed building to prevent rust does not need to be complicated or expensive. A simple, regular inspection routine catches problems early when they are quick and cheap to fix, before they develop into costly structural issues.

Simple Annual Maintenance Checklist

• Walk around the outside of the building and look for any areas of surface rust on cladding or steelwork
• Check all flashings, ridges and eaves for damage, lifting or gaps in sealant
• Inspect gutter and downpipe runs and clear any blockages. Blocked gutters cause water to overflow and run down the cladding constantly.
• Check all doors and windows for correct sealing and any signs of water tracking inside
• Look at the base of all walls internally and externally for any signs of moisture or early surface corrosion.
• Treat any small areas of surface rust immediately with a rust-inhibiting primer and touch-up paint before the damage spreads.
• Check ventilation openings are clear and functioning correctly to prevent condensation buildup

For agricultural buildings specifically, the ammonia and moisture produced by housed livestock significantly accelerate corrosion at a low level. Regular cleaning of the internal base of walls and ensuring adequate ventilation in livestock buildings and cattle buildings makes a real difference to the long-term condition of the steelwork.

Our article on common repair issues in agricultural buildings covers the most frequent maintenance problems and how to avoid them.

Steel-Framed Buildings at Kit Buildings Direct

At Kit Buildings Direct, we design, manufacture and install steel-framed buildings from our Derbyshire workshop. With over 50 years of experience delivering agricultural, industrial and commercial steel buildings across the UK, we are the experts on installing steel-framed buildings.

From protective coatings and precision fabrication through to professional installation, our team ensures every building is optimally designed to be protected against rust and corrosion. We also provide ongoing guidance to help customers maintain their buildings and protect structural steelwork over time.

Speak to Kit Buildings Direct today for our expert advice and request a free, no-obligation quote.