The 2026 Guide to Shot Blasting: Steelwork, Buildings, Floors & Surface Preparation

Ask ten people what shot blasting is used for and you may get ten different answers.

Some immediately think of structural steel.

Others think of concrete floors.

Property contractors may think of removing paint and coatings from brickwork.

An engineering company may be looking at machinery, fabricated steel or components that need stripping before they are recoated.

They are all legitimate applications.

Shot blasting is fundamentally a surface-preparation process.

The objective is not simply to make a surface rougher, smoother or cleaner.

The objective is to remove what should not be there and create the correct clean surface profile for whatever happens next.

What Is Shot Blasting?

Shot blasting uses abrasive media propelled against a surface to remove unwanted material and prepare the substrate underneath.

Depending on the project, that unwanted material may include:

• Rust and corrosion
• Mill scale
• Old paint
• Protective coatings
• Surface contamination
• Firmly bonded render or other material where appropriate
• Weak material or coatings on concrete surfaces

The blasting process can clean, strip and profile a surface in preparation for the next stage.

Very often, that next stage is more important than the blasted surface itself.

It might be a new protective coating on steel, an epoxy or resin floor system, a waterproofing membrane, a masonry repair or repainting.

The Correct Surface Profile Matters

One of the easiest misunderstandings about shot blasting is to think the objective is simply to make a surface as rough as possible.

It is not.

Nor is the objective always to make a surface as smooth as possible.

The correct finish depends on the material and what is being applied afterwards.

For example:

• Structural steel may need rust, mill scale and old coating removed while creating an appropriate anchor profile for the protective coating that follows.
• Concrete floors may need to be mechanically opened and profiled so an epoxy, resin, membrane or other flooring system can bond correctly.
• Brickwork may require controlled paint or coating removal while avoiding unnecessary damage to the face of the brick.
• Machinery and metalwork may require stripping and cleaning before repainting or protective coating.

The right result is therefore the surface condition required by the next system.

That means cleanliness, soundness and the correct level of profile all matter.

Structural Steel Shot Blasting

Structural steel is one of the most established applications for abrasive blasting.

Steel can arrive at the preparation stage carrying:

• Rust
• Corrosion
• Mill scale
• Old protective coatings
• Paint
• General surface contamination

Before a new protective paint or coating system is applied, these materials may need to be removed so the coating is being applied to a properly prepared substrate.

This is not simply cosmetic cleaning.

The blast-cleaned steel may also need the appropriate surface profile or anchor pattern for the coating system being specified.

Shot Blasting I-Beams and Structural Sections

Industrial and construction projects frequently involve I-beams, columns, channels, frames, fabricated sections and other structural steelwork.

These may be new sections requiring preparation or existing steel being refurbished as part of a maintenance programme.

Depending on the size and location, the steel may be blasted:

• At our Coventry workshop
• On site
• As part of a larger refurbishment programme
• Before a new protective coating system is applied

For structural steel, the question is not simply whether the surface looks clean.

The required preparation standard should be considered alongside the coating specification that follows.

Why Steel Preparation Matters Before Painting

Painting over corrosion, loose mill scale, failing coatings or poorly prepared steel can undermine the coating system from the beginning.

The purpose of blasting is to remove contaminants and unstable material and leave steel in a condition suitable for the next protective system.

Where preparation and coating are both required, our industrial painting contractor services can allow the two stages to be coordinated.

Industrial Machinery and Metalwork

Not every industrial blasting project involves structural steel or a building.

Machinery, fabricated steelwork, plant and metal components can accumulate years of:

• Paint
• Protective coatings
• Rust
• Oil and industrial contamination
• General deterioration

Where an item can be transported, workshop blasting can provide a controlled environment for preparation.

Where it cannot, mobile blasting may be the practical solution.

Workshop Shot Blasting

Intercity Contractors operates from Coventry, allowing suitable transportable items to be brought to us for preparation.

Workshop work can include:

• Fabricated steel
• Structural sections
• Machinery
• Industrial components
• Metal frames
• Other suitable items requiring coating removal or preparation

The purpose may be complete coating removal, corrosion removal, cleaning before inspection or preparation before repainting.

Mobile Shot Blasting

If the surface cannot come to the workshop, the blasting operation needs to go to the surface.

Mobile work can include:

• Structural steel
• Building façades
• Brickwork
• Basements
• Fixed machinery
• Industrial structures
• Concrete floors

Our guide to mobile shot blasting for houses and commercial properties looks specifically at the practical side of preparing fixed building surfaces on site.

Shot Blasting Brickwork and Buildings

Property work creates a very different set of challenges from structural steel.

Brickwork may need old paint and coatings removed as part of a refurbishment or restoration programme.

On suitable masonry, controlled blasting can prepare the surface for:

• Repainting
• Repair
• Repointing
• Restoration
• Leaving suitable original brick exposed

Here, the objective is often less about creating an aggressive profile and more about removing the unwanted finish while retaining the substrate underneath.

Our dedicated brickwork shot blasting services cover this specialist area.

Older and Historic Brickwork Needs More Control

Brickwork is not structural steel.

Older masonry can be softer, weathered or previously repaired.

A test area may therefore be appropriate to understand how the coating responds and what condition the underlying brick face is in.

The aim is controlled surface preparation, not maximum abrasion.

If the property is listed, historically significant or contains old or uncertain materials, appropriate conservation or specialist advice should be sought before abrasive preparation begins.

Removing Paint from Brickwork

Painted brick façades can accumulate several generations of coating over time.

Those coatings may eventually:

• Peel
• Flake
• Lose adhesion
• Become heavily layered
• Need removing as part of wider restoration

Where the brickwork is suitable, controlled blasting can help remove old coatings and expose a cleaner substrate for the next stage.

That may be repainting, masonry repair, repointing or restoration of exposed brick.

Read more in our guide to removing paint from brickwork with shot blasting.

London Property Shot Blasting

London creates some particularly varied property-shot-blasting requirements.

Projects may involve:

• Painted brick façades
• Georgian and period properties
• Commercial buildings
• Older industrial buildings
• Basements
• Render and stucco removal where appropriate

The combination of older building stock, access restrictions and neighbouring properties means the preparation method often needs careful planning.

Our property shot blasting in London guide looks at these issues in more detail.

Render and Stucco Removal

Shot blasting may also be used to remove suitable render, stucco and firmly bonded material from robust substrates where the specification allows it.

This should not be confused with assuming that every rendered building should simply be blasted clean.

The age of the building, composition of the render, significance of the existing finish and condition of the substrate all matter.

Historic lime stucco or listed-building fabric may require a conservation-led approach and a completely different removal method.

Intercity Contractors’ role is removal and surface preparation where blasting is appropriate. We do not install replacement render systems.

Where a later render or stucco specification requires a separate painted or protective finish, we may become involved again through our painting services.

Basement Preparation Before Waterproofing

Mobile blasting can also be used below ground.

Basements undergoing waterproofing or tanking may require old coatings, paint, render or other material removed so that the waterproofing specialist has a suitably prepared substrate.

Again, this is surface preparation.

Intercity Contractors does not design the basement waterproofing system.

Our role is to prepare the walls or floors where blasting forms part of the specified preparation process.

The waterproofing specialist should determine what condition the substrate needs to be in before their system is installed.

Concrete Floor Shot Blasting

Concrete floors are another major application.

Industrial coatings depend heavily on the condition of the surface underneath them.

Shot blasting can mechanically prepare concrete by removing weak surface material, contamination and previous coatings while creating the surface profile required by the next system.

That does not mean making the floor arbitrarily rough.

The surface needs to be clean, sound and appropriately profiled for the coating, resin, epoxy, membrane, overlay or repair system being applied afterwards.

One of the technical sources supplied for this article makes exactly this distinction: the useful question is whether the blasted concrete provides the correct surface profile for the system that follows, rather than whether it simply feels rough. :contentReference[oaicite:0]{index=0}

Factories and Warehouses

Concrete floor preparation is commonly required in:

• Factories
• Warehouses
• Workshops
• Production facilities
• Logistics buildings
• Commercial premises
• Car parks and loading areas

The floor may then receive an epoxy, resin, protective or other industrial coating system.

Our wider industrial floor painting services cover preparation and recoating across these environments.

The Shot-Blasted Floor Is Usually Not the Finished Floor

This is worth making clear.

A shot-blasted concrete floor is normally a prepared surface.

It may look dull, clean, open and mechanically textured.

That appearance is usually not the finished floor.

It is the substrate created so that the coating, membrane, overlay or repair material can adhere and perform correctly.

Shot Blasting Before Protective Coatings

Across steel, concrete and property refurbishment, this is one of the recurring themes.

Shot blasting often sits immediately before something more expensive.

That might be:

• An industrial paint system
• An epoxy or resin floor coating
• A waterproofing membrane
• A masonry repair
• A decorative coating
• A specialist protective system

That makes surface preparation disproportionately important.

A new system can only perform properly if the substrate underneath has been prepared to the required condition.

Shot Blasting and Sandblasting: What Is the Difference?

The term sandblasting is still widely used by customers as a generic description of abrasive blasting.

Modern professional abrasive blasting is more varied than simply using traditional silica sand.

Different blasting processes and abrasive media may be selected depending on:

• The substrate
• The material being removed
• The required surface profile
• Whether the work is indoors or outside
• The specification that follows

For most customers, the terminology matters less than selecting the correct preparation process for the actual surface and required outcome.

Shot Blasting Structural Steel Before Recoating

Existing structural steel may have several generations of coating on it.

Maintenance programmes can involve:

• Removing failed coatings
• Removing corrosion
• Removing mill scale
• Preparing previously painted steel
• Preparing repairs or modified sections
• Creating a suitable clean surface and profile for the new protective system

On some projects, only localised areas require attention. Others involve complete structural refurbishment.

The required preparation standard should always be considered alongside the coating specification.

Factories, Plant and Industrial Structures

Industrial sites often contain surfaces that cannot practically be transported anywhere.

Mobile blasting can therefore form part of refurbishment involving:

• Factory steelwork
• Plant rooms
• Industrial machinery
• Internal structures
• External frames
• Fixed equipment

The preparation may form part of planned maintenance, a change of use, machinery relocation or a wider refurbishment programme.

Does Shot Blasting Make a Surface Rough or Smooth?

The most accurate answer is: neither is the universal objective.

Shot blasting changes the condition and profile of the surface.

In some applications it removes scale, corrosion, coatings and irregular contamination to leave a visibly cleaner and more uniform surface.

In other applications, particularly concrete and steel preparation before coatings, it deliberately creates a mechanical profile that helps the next system bond.

What matters is not whether the surface is described casually as rough or smooth.

What matters is whether it is:

• Clean
• Sound
• Free from unwanted contamination or unstable material
• Prepared to the profile required by the next system

What Determines the Right Blasting Approach?

Before work begins, several things need to be understood:

• What is the substrate?
• What needs to be removed?
• How strongly is it bonded?
• What condition is the underlying surface in?
• What specification is required afterwards?
• Can the item be moved?
• What access is available?
• What other trades are involved?

There is no universal blasting setup that is right for every project.

Where the specification is unclear or the substrate is unusual, seek appropriate technical advice before deciding how the surface should be prepared.

Shot Blasting as Part of a Larger Contract

On many projects, we are not the only contractor involved.

Intercity Contractors may be appointed directly by the building owner or business, or work as a specialist subcontractor for:

• Main contractors
• Facilities-management companies
• Property managers
• Engineering contractors
• Painting contractors
• Waterproofing specialists

The preparation work then needs to fit within the wider programme.

Read more about working with us as a specialist shot blasting subcontractor.

Why Experience Matters

Shot blasting looks deceptively simple when reduced to a description.

Project abrasive media at a surface and remove what should not be there.

In practice, the judgement lies in knowing:

What to remove.

What to leave.

How far to go.

What surface profile is required.

And what condition the substrate needs to be in when the next contractor arrives.

Shot Blasting in 2026

The fundamental purpose has not changed.

Industry still needs steel cleaned and profiled before protective coatings.

Factories still need concrete floors prepared before painting and resin systems.

Buildings still need old coatings removed.

Machinery still needs stripping and refurbishment.

Basements still need suitable substrates prepared before waterproofing.

What changes from project to project is the material, specification and level of preparation required.

The objective remains the same: leave the substrate clean, sound and correctly prepared for the next stage of the project.