Specialist Roofing Membrane Contractors Insurance
Membrane contractors install single ply PVC and TPO, EPDM, liquid applied and other specialist systems on flat and low pitch roofs, podium decks, balconies, green roofs and blue roofs. Most of the work is commercial: warehouses, schools, retail parks, offices and apartment blocks, often with the building fully occupied below.
The trade sits closely alongside the membrane manufacturers. Many contractors hold approved installer status, work to the manufacturer's specification and fixing calculations, and hand over with a manufacturer's guarantee that depends on the installation being inspected and registered. That relationship shapes both the liability and how claims play out.
Membrane systems give contractors a route away from torch on felt. Hot air welding, cold applied adhesives and liquid systems all reduce the open flame risk, but they bring their own hazards: heat from welding equipment, flammable solvent adhesives and vapours from some liquid resins. Insurers will want to know which methods you use and how you control them.
We can help you arrange cover that matches the systems you install, the buildings you work on and your role in specification. That typically means liability cover that responds to water ingress into high value interiors, contract works for large roof areas exposed during installation, and professional indemnity where you design build ups or take on specification.
Common claims and risk exposures
The exposures that produce claims in this trade, rather than a generic list.
Leaks into high value commercial buildings
A defective seam, upstand or outlet detail on a warehouse or data centre roof can let water onto racked stock, electrical plant or IT equipment. Because flat roofs drain slowly, a small defect can discharge a lot of water before anyone traces it, and the claim is often for the damage to contents and interruption rather than the roof.
Wind uplift and detachment
Mechanically fixed and adhered membranes must resist wind uplift calculated for the building's height, location and exposure. Too few fasteners in the perimeter and corner zones, or adhesive applied in the wrong conditions, can allow sheets to peel back in a storm, exposing the building and throwing material onto neighbouring property.
Falls through fragile rooflights and decks
Membrane refurbishment frequently happens on older industrial roofs with plastic rooflights, corroded metal decking or fragile sheets. A person who steps on a rooflight or onto rotten decking can fall a long way. Edge protection, covers and safe access routes are what underwriters ask about.
Heat and solvent fire risk
Hot air welders operate at high temperatures and can ignite insulation or debris at the seam. Contact adhesives and primers used with EPDM and some single ply systems give off flammable vapours. Many policies treat hot air welding as hot work, so permits and fire watches may still be required even though no torch is used.
Trapped moisture in overlay work
Overlaying a new membrane on an existing roof can trap water in old insulation and decking. Over time this may lead to condensation, blistering or loss of insulation value. Whether a core survey was carried out and who decided the old build up could stay is often the point in dispute.
The cover we arrange
We arrange insurance around the work you carry out, the contracts you take and the sites you work on. The cover available will depend on the individual risk and the terms offered by insurers.
Public and products liability
Third party injury and property damage, including water damage to the building interior, stock and equipment, during works and after handover. Commercial clients commonly require £5m or £10m, and higher limits may be requested on large distribution or data centre roofs.
- Water damage to interiors, stock and plant
- Injury from falling materials
- Completed work after handover
- Limits typically £5m or £10m
Employers' liability
Employers' liability is a legal requirement once you employ people, and can be arranged where required, subject to the policy terms. The underwriting focus is on fragile roof controls, edge protection and handling of heavy rolls and insulation boards.
- Legal requirement once you employ people
- Falls through fragile rooflights and decks
- Manual handling of rolls and boards
- Labour only subcontractors
Contract works
Large roof areas are stripped and rebuilt in phases, leaving sections exposed with temporary waterproofing. Contract works covers the membrane, insulation and work in progress against storm, fire and theft until handover.
- Roof works in progress, phase by phase
- Insulation and membrane rolls on the roof
- Storm damage before completion
- Materials in transit
Professional indemnity
Relevant where you design the roof build up, specify insulation and falls, carry out condensation risk analysis, or substitute one system for another. Manufacturers often provide specifications, but contractors who change them or design their own take on professional exposure.
- Roof build up and falls design
- System substitution and value engineering
- Condensation and drainage advice
- Claims made basis
Plant and equipment
Automatic hot air welders, seam probes, leak detection equipment, roof hoists and edge protection systems. Automatic welders are valuable and portable, so theft from roofs and vehicles is worth thinking about.
- Automatic and hand held hot air welders
- Leak detection and testing equipment
- Roof hoists and edge protection
- Hired in plant and hire charges
What an underwriter will ask
Having these to hand shortens the process considerably, and usually improves the terms.
- The systems you install: PVC, TPO, EPDM, liquid applied, reinforced bitumen or green and blue roofs
- Your installation methods: hot air welding, adhered, mechanically fixed, ballasted or torch on
- Approved installer status with membrane manufacturers
- Whether you design build ups or work to the manufacturer's specification
- How you handle fragile rooflights and decking on refurbishment work
- Whether you carry out leak detection or integrity testing before handover
- The buildings you work on, including data centres and occupied residential blocks
- Your hot works procedure for welding and any remaining torch on work
- Five years of claims, particularly water ingress after handover
What affects the cost of your insurance?
The main factors insurers consider when assessing the premium.
Installation method
Hot air welded and cold applied systems usually present better than torch on, but the presence of solvents, adhesives and welding heat is still rated. Contractors who use no open flame at all should make that clear.
Building types and contents
Roofs over data centres, cold stores and high bay warehouses expose far more value to a single leak than a school or small industrial unit, and the rating follows the contents below.
Manufacturer approvals and testing
Approved installer status, manufacturer inspections at completion and integrity testing before handover give underwriters evidence that the finished roof has been checked by more than the installer alone.
Refurbishment of fragile roofs
Work on older industrial roofs with fragile rooflights raises the fall exposure. Documented fragile roof controls and safe systems of work improve how that is viewed.
Conditions and exclusions to consider
Terms vary between insurers, so treat these as the questions to ask rather than a description of any one policy.
Manufacturer guarantee obligations
A manufacturer's guarantee is a separate promise from the manufacturer, usually conditional on approved installation. If the manufacturer pursues you to recover what it paid, or requires you to remedy defects as a condition of approval, your liability policy will typically respond only to damage, not to the cost of repairing the membrane.
Rectifying the membrane itself
Rewelding a failed seam or replacing a section that detached is a rectification cost. Damage to the building interior and contents may be covered, but the roof covering you installed generally is not.
Hot works conditions
Where a policy treats welding and adhesive work as hot work, conditions such as permits, extinguishers and a fire watch may apply. A fire claim where those conditions were not followed may be declined or reduced.
Gradual water ingress
A slow leak that damages insulation and decking over months may fall outside policies that respond to sudden and accidental damage. Regular inspection clauses in maintenance agreements help identify problems before they become gradual.
Common questions
How is membrane roofing insurance different from general roofing cover?
The core covers are similar, but the emphasis changes. Membrane contractors work mostly on commercial flat roofs over high value contents, so water ingress after handover is a major exposure. Many have moved away from torch on to hot air welding and cold applied systems, which affects the fire rating, and their relationship with membrane manufacturers and guarantee schemes adds questions about specification and approval that a general roofer may not face.
Does the manufacturer's guarantee protect me as the installer?
Not directly. A manufacturer's guarantee protects the building owner and is usually conditional on the system being installed by an approved contractor and inspected. If a defect is traced to installation, the manufacturer may require you to put it right or seek to recover its costs from you. Your insurance may cover resulting damage to the building, but repairing the membrane is generally your own cost.
Is hot air welding treated as hot work by insurers?
Often it is. Many policies define hot work broadly enough to include any process producing heat or sparks, which can capture hot air welding and some heat activated adhesives. That means permits, fire extinguishers and a fire watch may still be conditions of cover. Check your wording, and tell your broker exactly which methods you use rather than describing the work as torch free.
Am I covered if a roof leaks into a warehouse after handover?
Damage to stock, equipment and the building interior caused by defective installation would normally fall under products liability, subject to the policy terms and excess. The cost of repairing the membrane itself is usually excluded. Higher limits are worth considering on roofs over high value contents, because a single leak onto racked stock or electrical plant can produce a large claim.
Do I need professional indemnity as a membrane installer?
If you only install to a specification provided by the manufacturer or a designer, the professional exposure is limited. If you design build ups, calculate falls, choose insulation thickness, substitute systems or advise on whether an existing roof can be overlaid, those are professional decisions. A claim that the design was wrong is typically excluded from liability cover, so professional indemnity is worth having where you take on that role.
How do I get a quote from True Risk Solutions?
Call 01304 262880 and speak to a broker, or email info@truerisksolutions.co.uk with what you do, what you need cover for and a phone number with the best time to call, and a broker will call you back. We need a phone number to quote, because the cover and the price depend on questions that are quicker to answer on a call than by email.
Speak to a specialist who understands your industry
Tell us about your business and the work you undertake, and we will come back to you with cover options built around it. Call 01304 262880, or email us with a phone number and the best time to call and a broker will ring you back.