Commercial Roofers

Here at Topseal, we supply all manner of commercial roofing projects across the UK; whether it’s refurbishing a school roof or fitting a completely new roofing system on a warehouse.

We are the leading commercial roofing suppliers in the industry, tailoring each and every project to fit the individual needs of each business. We approach each project in a completely unique way whilst still retaining our knowledge and experience from every past project we’ve worked on.

Commercial Roofing Services tailored to your needs:

At Topseal, we understand the importance of a sturdy and reliable roof for your commercial or industrial property. Whether you are in need of roofing repairs,
maintenance, or a complete roof replacement, our team of experts is here to provide tailored solutions to meet your specific needs.

Why Choose Topseal for Your Commercial Roofing Needs?
Experience and Expertise
With decades of experience in the roofing industry, we have the expertise to handle projects of any size or complexity. Our experienced, approved installers are trained to deliver high-quality workmanship using the latest techniques and materials.
Tailored Solutions
We understand that every commercial property is unique, which is why we offer customised roofing solutions tailored to your specific requirements. We work closely with clients to understand their needs and provide the best possible solution.
Quality Materials
We believe in using only the highest quality materials for our roofing projects. Our commercial roofing solutions are built to last, providing long-term durability and protection for your property. From advanced waterproofing systems to energy-efficient roofing options, we offer a wide range of materials to suit your needs and budget.

Comprehensive Services Our range of commercial roofing services includes

New Roof Installations:

We specialise in installing high-quality roofs tailored to the specific requirements of your commercial property.

Roof Repairs:

From minor leaks to major damage, our approved installers can repair your commercial roof, ensuring minimal disruption to your business operations.

Roof Inspections:

Our thorough roof inspections help identify any issues early on, allowing us to address them before they escalate into major problems.

Industry-Leading Warranty:

We stand behind the quality of our workmanship and materials with industry-leading warranties. With Topseal, you can have peace of mind knowing that your investment is protected for years to come.

Our Approach to Commercial Roofing

1. Consultation:

We start by conducting a thorough consultation to understand your needs and goals. Whether you’re looking to improve energy efficiency, enhance aesthetics, or address specific roofing issues, we tailor our approach accordingly.

2. Site Assessment:

Our team performs a detailed assessment of your property to identify any
existing issues or potential challenges. This allows us to develop a customised solution that meets your requirements and adheres to industry standards.

3. Customised Solution:

Based on our assessment and your requirements, we develop a customised roofing solution that suits your needs.

4. Professional Installation:

Topseal approved contractors handle every aspect of the installation process with precision and care. The approved contractor will ensure that the project is completed efficiently and to the highest standards of quality.

5. Ongoing Support

Even after the project is complete, we’re here to provide ongoing support as needed. Our goal is to build long-term relationships with our clients and ensure their satisfaction for years to come.

Our commercial roofing services cover
Shopping centres
Local Authority Buildings
Heritage buildings
Universities and Schools

Commercial Roof Surveys Available

Before commencing work on your commercial roofing project, we can perform a professional commercial roof survey to thoroughly assess the requirements of your roof repair or replacement.

How much will a new commercial roof cost?

The roof is one of the most important elements of any building and can also be one of the most expensive. If your commercial roof has reached the point where repair is no longer an option, you’ll need to consider the cost factors involved in a commercial roof replacement in order to help you budget.

As there are several factors to consider when replacing a commercial roof, there is not a set cost for this. We’ll be able to give you a more specific price once we’ve conducted a commercial roof survey and determined what work is needed. Some of the factors we’ll take into consideration when calculating your quote for a new commercial roof include:

  • The size of the roof and the accessibility of the area we’re working on.
  • The material used.
  • The installation time.
  • Complexity of the roof layout.

What are the signs of damage to a commercial roof?

When making the decision to replace or repair your commercial roof, you should take note of the first signs of damage to your roofing system. These include:

• Noticing stains on your walls, floors, or ceilings – Stains can often be caused by water seeping through your commercial roof.
• Water leaking – Whilst this may seem obvious, if there is water leaking through your commercial roof, this is a clear sign of damage.
• Problems with guttering – Blocked or broken gutters can cause a range of problems with your commercial roof, as rainwater does not have a clear exit route. This is a frequent issue with flat commercial roofs.
• A bad smell – If you can’t locate the source of a bad smell in your commercial premises, you should always check your roof. Damp insulation and mould are often the cause of bad smells. So, if you’ve noticed an odour that just won’t go away, ask a commercial roofing contractor to take a look.
• Damage to flashing – If the flashing on your commercial roof is damaged, it won’t be providing any protection from water damage. Keep an eye out for any rusting and peeling to your flashing. If you do spot any problems, call a commercial roofing contractor as soon as possible.

Should I repair or replace my commercial roof?

The decision whether to repair or replace your commercial roof will inevitably come down to the extent of the damage to your roof, and which option works out to be more cost-effective in the long run.

Before making this decision, you should get a commercial roof survey. Our commercial roofing contractors will thoroughly inspect your roof and find out exactly what the problem is and where the damage is located.

The majority of general wear and tear issues can be solved with a simple roof repair, or even just some basic commercial roof maintenance, such as replacing your leaf guards and removing debris.

It may be that the whole roof is damaged, or the problem could just be localised to one area. If the latter is the case, commercial roof repair could be a better option.

If you find that the same issues keep recurring with your commercial roof, then having repair work undertaken every few months could be expensive. In this case, it would probably be more cost effective to have a full commercial roof replacement.

It’s vital that you keep on top of roof maintenance and, if you spot anything of concern, book a commercial roof survey without delay. In this way, small problems with your commercial roof shouldn’t become bigger and more expensive ones.

Case Studies

This NHS Trust is one of England’s largest acute teaching trusts. The trust is investing millions of pounds to futureproof their and deliver energy and carbon reductions by improving roof insulation and through the installation of solar PV panels and air source heat pumps in hospital buildings. The repair of leaking roofs is an integral part of this process. This will reduce the Trust’s carbon footprint by 14,000 tonnes a year and guarantee energy savings of approximately £1.8 million a year for the Trust. Topseal Systems are very proud to have been specified to carry out the roofing works and have been working closely with the Trust on two of their sites. Seven areas covering a total of nearly 8000m² that required urgent attention, all throwing up its own unique challenges. Topseal Systems along several Topseal Approved Contractors were able to complete these works efficiently and to an extremely high standard within the required timescale.

West Wing Corridor

Substrate: Felt
Size: 450m²
System installed: Topseal PU Warm Roof
Scope of works: Roof swept clean, cut to falls insulation installed to improve drainage, Topseal PU 20-year system installed.
Additional works: Pneumatic Tube Transport (PTT) raised to allow Topseal PU to be installed underneath and new handrail system installed.

Breast Clinic

Substrate: Single ply
Size: 830m² over 2 areas
System installed: Topseal PU
Scope of works: Roofs cleared of pebbles and cleaned down, coping stones removed, entire surface primed including capping the top of the parapet to prevent water ingress from coping stones and Topseal PU 20-year system installed.
Additional works: Installed new handrails and lightning protection.

Mobility Centre

Substrate: Felt
Size: 2250m² over 2 areas
System installed: Topseal PU Warm Roof
Scope of works: Roof swept clean to remove moss and loose chippings, blistered felt repaired or removed, 140mm insulation installed, Topseal PU 20-year system installed.
Additional works: Removed redundant rooflights

H Block

Substrate: Felt
Size: 2500m²
System installed: Topseal PU Warm Roof
Scope of works: Roof swept clean, 140mm insulation installed, Topseal PU 20-year system installed.
Additional works: Installed new handrails, parapet capping and lightning protection

Clinical Trials

Substrate: Felt with new insulation
Size: 600m² 
System installed: Topseal PU Warm Roof
Scope of works: Roof swept clean, 140mm insulation installed, Topseal PU 20-year system installed.
Additional works: Installed new handrails and lightning protection installed. Dormant M&E and rooflights removed.


Substrate: Felt, concrete and OSB3
Size: 700m²
System installed: Topseal PU Warm Roof
Scope of works: Roof areas cleaned, organic growth removed, section of existing timber deck removed, joists checked for condition, new subdeck installed, 140mm insulation installed, Topseal PU 20-year system installed.
Additional works: Installed new rooflights, new pitched roofs, lead repairs and new rainwater goods, removed dangerous brickwork and rooflights. 

Queens Medical Centre

Substrate: Asphalt
Size: 500m² 
System installed: Topseal PU 25 year with non-slip finish.
Scope of works: Roof surface cleaned, asphalt repairs carried out, Topseal PU 25-year system installed with non-slip finish.
Additional works: Rubber crumb tiles installed.

Mason House, Lichfield, Birmingham

Nursing home. 290m2 in total. A GRP roof was installed on the new extension to the nursing home less than 2 years ago. There have been a number of issues wrong with the roof, the coping stones being too small and the GRP installed onto plywood which has led to failure in the membrane. We have applied Topseal PU to all valleys and box gutters and Topseal GRP to the parapet detail to replicate the coping stone, colour matching the finished topcoat to the windows lintels. Guaranteed for 25 years.

St Thomas Church, Ashton in Makerfield

Grade 2 listed church. 37m2. Asphalt roof with numerous cracks due to movement in the substrate because of thermal expansion and contraction. Numerous repairs over the years. Topseal PU applied with a 20 year guarantee.

About Topseal

Topseal have been working closely with a wide range of commercial customers for more than 25 years across the UK. We back up our high-quality GRP roofing products with comprehensive training and ongoing CPD seminars. Our roofing solutions are suitable for a wide range of projects from small through to medium and large scale commercial sites and come with full BBA certification and up to 40 years of materials and workmanship guarantee.

Topseal products can only be installed by approved contractors who have been through our intensive training programme. All Topseal roofing systems achieve BBA Certification and meet ISO9001:2015 and ISO14001 standards. We offer a range of different systems to suit almost any situation:

Topseal HD

Suitable for installation if there is heavy foot traffic, including for walkways and balconies, Topseal HD comes with a 30-year materials guarantee


Topseal PU

A high performance, moisture cured, single component, reinforced, UV stable polyurethane, for use on new and existing flat and pitched roofs. It comes with a 20 or 25 year guarantee along with B Roof t4 Fire Certification.
The limits are endless with Topseal PU. It can be used on both domestic and commercial new build and refurbishment projects. From something as small as a porch, through to apartment blocks, leisure centres, hospitals, box gutters, timber framed buildings and right up to factory roofs which can be 1000’s of sq. metres without the need of expansion details. Due to the properties of Topseal PU, it can also be used on vertical faces and upside-down without any slumping occurring.

Topseal Double Top

If your client requires an extra tough roofing solution, then the Topseal Double Top system certainly fits the bill. Ideal for major projects and water features, it comes with a 25-year guarantee for water features and 40 years for roofing.

Topseal Green Top

Green roofs are becoming increasingly popular, especially in inner-city areas. Our Green Top system allows a standard green roof system (Not tray / cassette systems – these can be installed onto Topseal HD) to be installed over our Topseal Double Top system. It comes with a 25-year guarantee.


To support our nationwide team of certified installers we provide a range of additional services, including:

1. Roof Surveys

Particularly for large projects, choosing the right flat roofing solution is critical. At Topseal we can arrange a direct survey of the area that you are working on to make sure that you install the perfect product and satisfy your customer’s needs.

2. Bespoke Solutions

At Topseal, we aim to be as flexible as possible when supporting our nationwide team of installers. If you have a flat roof that requires a tailored solution, we will be there to support you and offer our advice.

3. Contract Monitoring

We take great pride in our products at Topseal and regularly take part in monitoring to ensure our systems are installed professionally and effectively.

Approved Contractors

Our Topseal products are not available to the general public. To install one of our GRP flat roofing solutions, installers need to have gone through our intensive training course and become approved contractors. If you want to add Topseal products to your business, contact our training team today.

Project Assistance

Our reputation over 25 years has been built on a strong relationship with our army of installers and contractors around the UK. We see this as a partnership, and we want to make sure our wide-ranging experience is easily available.
Our support team is on hand for any project whether it’s a new construction or a roof refurbishment. We’ll make sure you have the assistance and advice that you are looking for at every stage of the process.

NBS Source

Topseal is a BBA certified GRP roofing system fitted with
a 20 to 40-year product and workmanship guarantee.Our products are also
IS0:14001 and ISO:9001 certificated.

• Topseal Roofing System

• Topseal DoubleTop System
• Topseal GreenTop System

• Topseal Heavy Duty System
• Topseal PU

CPD Workshop

The Topseal CPD Workshop is available to all architects, specifiers and commercial customers who wish to learn more about Topseal’s range of systems and working with Topseal.

The CPD Workshop will last roughly an hour and involves a presentation about Topseal where we hope to increase your awareness of our GRP and PU systems as a whole, thereby stimulating your interest in finding out more. By doing this we will increase your knowledge and confidence in specifying Topseal flat roofing systems in the future. The presentation covers details of all of the Topseal BBA certified roofing systems and different application situations, the session is then finished off with Q&A’s. We can also go through specific projects that you may have in the pipeline.

As cold liquid applied waterproofing membranes become more prominent in the roofing market, we have found the demand for our CPD seminars has also increased. CPD Workshops are available in your office or via video for your convenience. A certificate of attendance is also available once the Topseal CPD is completed.

Organisations that have chosen Topseal



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