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Over Roofs
An over roof is a refurbishment method where a new roofing system is installed directly over the existing roof without removing the old sheets. Spacer bars and new metal sheets are fitted above the current covering to create a fresh weatherproof layer.
How It Works
- Spacer brackets are fixed through the existing roof into the purlins New metal sheets are installed over the brackets
- A ventilation gap is created between the old and new roof Insulation can be added to improve thermal performance
Benefits
- Minimal disruption to building operations
- No need to strip the existing roof
- Cost effective compared to full replacement Improves thermal performance
- Extends roof lifespan while reducing waste
Typical Applications
- Warehouses
- Factories
- Industrial units
- Commercial buildings needing fast refurbishment
Re-Roofs
A re-roof is a full roof replacement where all existing sheets and flashings are removed and a brand new roofing system is installed. This allows the structure to be inspected, repaired and upgraded before fitting the new roof.
How It Works
- Old roof sheets are stripped off
- The structure is checked and any remedial works completed New insulation can be installed to meet current regulations
- New metal roof sheets and flashings are fitted to manufacturer specification
Benefits
- Full renewal of the entire roof system
- Ensures compliance with current building standards
- Allows structural repairs that cannot be done during an over roof Eliminates historic leaks and defects
- Provides maximum lifespan and performance
Typical Applications
- Warehouses
- Factories
- Industrial units
- Commercial buildings needing full roof replacement
Liquid Plastics
Liquid plastics are seamless waterproofing systems applied directly to the existing roof surface. They create a fully bonded, watertight membrane without the need to remove the current covering.
How It Works
- The roof is cleaned and prepared
- Cracks, joints and weak points are reinforced
- A liquid waterproofing membrane is applied in layers
- The system cures to form a seamless, flexible finish Suitable for gutters, flat roofs and complex details
Benefits
- Cost effective compared to full roof replacement
- Minimal disruption to building operations
- Ideal for roofs with difficult access or complex detailing
- Creates a seamless waterproof layer with no joints
- Extends roof lifespan and stops existing leaks
- Compatible with most existing roof surfaces
Typical Applications
- Flat roofs
- Gutters and valley gutters
- Asbestos roofs where removal is not viable
- Industrial and commercial buildings needing fast refurbishment
Single Ply
Single ply is a lightweight roofing system made from flexible membrane sheets that are mechanically fixed or adhered to the roof deck. It provides a modern, durable and watertight finish ideal for flat and low pitched roofs.
How It Works
- The roof deck is cleaned and prepared
- Insulation is installed if required
- Single ply membrane sheets are laid out and fixed or bonded Joints are heat welded to create a seamless waterproof layer
- All edges, penetrations and details are fully sealed
Benefits
- Lightweight and fast to install
- Highly durable with excellent UV resistance
- Provides a clean modern appearance
- Suitable for new builds and refurbishments
- Creates a seamless waterproof finish
- Low maintenance and long lifespan
Typical Applications
- Flat roofs
- Low pitched commercial roofs
- Industrial units
- Extensions and new build projects
- Roofs requiring lightweight waterproofing systems
Composite Panel
Composite panels are insulated metal roofing sheets made from two steel skins bonded to a rigid insulation core. They provide excellent thermal performance, fast installation and a modern, durable finish suitable for commercial and industrial buildings.
How It Works
- Old roof sheets are removed if required
- New composite panels are lifted into position
- Panels are fixed directly to the purlins
- Side laps and joints are sealed for full weather protection Flashings and trims are installed to complete the system
Benefits
- High thermal performance due to built in insulation
- Fast installation with large spanning capability
- Clean modern appearance
- Excellent weather resistance and durability
- Ideal for new builds and full roof replacements
- Reduces installation time compared to built up systems
Typical Applications
- Warehouses
- Factories
- Industrial units
- Commercial buildings requiring insulated roof systems
Built Up Roof System
A built up roof system is a multi layer roofing solution that uses a vapour control layer, insulation and a waterproof membrane to create a durable, long lasting roof. It is ideal for flat and low pitched roofs where high performance and thermal efficiency are required.
How It Works
- The roof deck is prepared and a vapour control layer installed Insulation is fitted to achieve the required thermal performance
- A multi layer waterproofing membrane is applied
- Surface finishes such as mineral cap sheets or liquid top coats are added
- All edges, penetrations and details are fully sealed
Benefits
- Highly durable with excellent weather resistance
- Strong thermal performance due to layered construction
- Suitable for complex roof shapes and detailing
- Long lifespan with low maintenance requirements Ideal for refurbishment and new build projects
Typical Applications
- Flat roofs
- Low pitched commercial roofs
- Industrial units Schools, hospitals and high performance buildings
Rooflights
Rooflights are translucent panels installed within the roof system to introduce natural daylight into the building. They improve visibility, reduce energy use and enhance the working environment without altering the main roof structure.
How It Works
- Existing roof sheets are removed or cut to create openings
- New GRP or polycarbonate rooflights are installed to suit the roof profile
- Rooflights are fixed and sealed to ensure full weather protection Flashings and trims are added to complete the detail
Benefits
- Provides natural daylight and reduces reliance on artificial lighting Improves working conditions inside the building
- Can be installed during refurbishment or new roof works
- Available in various profiles to suit most metal roof systems
- Helps reduce energy consumption
Typical Applications
- Warehouses
- Factories
- Industrial units
- Commercial buildings requiring improved internal lighting
Repairs
Commercial roof repairs restore the performance, safety and weather protection of ageing or damaged roofing systems. Repairs address leaks, failed fixings, damaged sheets, deteriorated flashings and worn waterproofing to extend the lifespan of the roof and prevent further issues. Suitable for all commercial and industrial roof types.
How It Works
- The roof is inspected to identify leaks, damage and weak points
- Failed fixings, sheets or flashings are removed and replaced
- Damaged membranes, sealants or coatings are repaired or renewed
- Localised cleaning is carried out to ensure proper adhesion
- All repaired areas are sealed, weatherproofed and tested
Benefits
- Prevents leaks and water ingress
- Extends the lifespan of the existing roof
- Cost‑effective alternative to full replacement
- Improves safety and structural performance
- Suitable for all commercial roof types and materials
Typical Applications
- Flat roofs
- Low pitched commercial roofs
- Industrial units
- Warehouses and factories
- Schools, hospitals and public buildings
Get In Touch
Office: 01424 605195
Email: info@commercialrc.co.uk
If you have an ongoing or upcoming project and you'd like our help, get in touch today and speak with one of our friendly office team.