A new roofing system is more than a new outer covering. A complete installation may include removal of old tiles, inspection of rafters, replacement of underlay and battens, new insulation, fresh roof coverings, ridge details, valleys, flashing and drainage.
This guide explains how professional roof installation works, which systems suit different properties and what homeowners should expect before, during and after the project.
What Is a New Roofing System?
A new roofing system is the complete combination of structural support, underlay, battens, insulation, waterproofing, tiles or membranes, flashing and drainage components that protect the property.
Rafters and supporting timber carry the roof load.
Felt or breathable membrane provides secondary protection.
Timber battens support tiles and create fixing lines.
Slate, tiles, EPDM, GRP or felt forms the weatherproof surface.
Leadwork protects walls, chimneys, valleys and roof openings.
Gutters, valleys and outlets move rainwater away safely.
Types of New Roofing Systems
| Roofing system | Best suited for | Main advantage |
|---|---|---|
| Slate roof | Traditional and premium properties | Long lifespan and classic appearance |
| Clay or concrete tiles | Most pitched residential roofs | Durability and wide style choice |
| EPDM rubber | Extensions, garages and large flat roofs | Flexibility and long lifespan |
| GRP fibreglass | Garages, dormers and visible flat roofs | Hard seamless finish |
| Modern felt | Smaller flat roofs and budget projects | Practical and cost-effective |
Slate Roofing
Slate offers a premium finish and can last for many decades when installed correctly. It is especially suited to period homes and properties where appearance is important.
- Excellent durability
- Natural appearance
- Strong weather resistance
- Suitable for many traditional London properties
Clay and Concrete Roof Tiles
Clay and concrete tiles are widely used across London. They provide reliable protection, are available in many profiles and can be matched to different architectural styles.
- Good value over the roof lifespan
- Wide choice of colours and profiles
- Individual tiles can be replaced
- Compatible with modern breathable membranes
New Flat Roofing Systems
Flat roofs require careful planning of the deck, falls, outlets, insulation and wall upstands. EPDM, GRP and felt all perform well when matched to the right roof.
| System | Typical lifespan | Best use |
|---|---|---|
| EPDM | 40–50 years | Large extensions and garages |
| GRP | 30–40 years | Dormers and visible roofs |
| Modern felt | 15–20 years | Smaller or budget-sensitive roofs |
New Roof Installation Process
- Inspect the existing roof and structure.
- Plan access, scaffolding and waste removal.
- Remove old tiles, felt and battens.
- Inspect rafters and replace damaged timber.
- Install new underlay and battens.
- Fit the selected roof covering.
- Install ridge, valley and flashing details.
- Complete gutters, edges and final checks.
Expert tip: Replacing only the visible tiles without checking felt, battens and timber can leave hidden problems underneath. A complete new roof should address the entire system.
Underlay, Battens and Ventilation
Modern roof installations use a suitable underlay or breathable membrane beneath the tiles. Battens must be correctly spaced and securely fixed. Ventilation should also be planned to reduce condensation risk.
Lead Flashing and Roof Junctions
Chimneys, walls, skylights and valleys need properly formed flashing. These areas are common leak points when installation is rushed or the leadwork is not allowed to move correctly.
How Long Does a New Roof Installation Take?
The timescale depends on roof size, complexity, access, weather and the amount of structural repair required.
| Project type | Typical duration |
|---|---|
| Small garage or extension roof | Several days |
| Average pitched residential roof | About one to two weeks |
| Complex roof with chimneys and valleys | Longer depending on detail and access |
What Affects New Roof Cost?
- Roof size and shape
- Chosen materials
- Scaffolding and access
- Timber or deck repairs
- Insulation requirements
- Chimney, valley and flashing details
- Waste disposal
Signs You May Need a New Roof
- Repeated leaks in several areas
- Widespread damaged or missing tiles
- Brittle underlay and rotten battens
- Sagging roof sections
- Major storm damage
- Roof near the end of its expected life
Real Project Spotlight: Full Roof Renewal
During a recent inspection, the outer tiles showed general wear, but the main problem was beneath them. The old felt had become brittle, several battens were rotten and previous patch repairs were no longer reliable.
The correct solution was to remove the roof covering, renew the underlay and battens, repair damaged timber and reinstall a complete weatherproof roof system.
Common New Roof Installation Mistakes
- Installing new tiles over damaged underlay
- Incorrect batten spacing
- Poor ventilation planning
- Weak chimney and wall flashing
- Insufficient flat roof falls
- Using unsuitable materials for the roof pitch
- Failing to inspect structural timber
Why Choose Sparkling Roofing?
Sparkling Roofing Ltd provides new roof installation, flat roofing, repairs and roof replacement services across London.
- Slate, tile, EPDM, GRP and felt experience
- Underlay, battens and timber inspection
- Lead flashing and chimney detailing
- Clear written quotations
- Service across London and surrounding areas
Explore our Flat Roofing London, Roof Repairs London, Roofing Services Putney and Roofing Services Wimbledon pages.
Frequently Asked Questions
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Tell us about your property and we will help you understand the most suitable roofing system and installation options.