Flat Roofing

Flat Roofing has become a widely adopted solution for both residential and commercial properties, prized for its sleek appearance, ease of installation, and cost-effective maintenance. When designed and installed correctly, a flat roof delivers exceptional weather resistance, energy efficiency, and longevity—making it a smart long-term investment.

Types of Flat Roofing Systems

When specifying your Flat Roofing system, it’s important to balance budget, longevity, and performance. Our most popular options include:

  1. EPDM Rubber Membranes: A durable synthetic rubber solution with a lifespan exceeding 30 years. Highly resistant to UV, ozone, and thermal movement.
  2. GRP Fibreglass Roofing: Glass Reinforced Plastic creates a seamless, watertight finish that resists impact, fire, and chemical exposure.
  3. Single-Ply Membranes (TPO & PVC): Lightweight, reflective sheets that reduce heat gain and boast excellent chemical and UV resistance.
  4. Traditional: Bitumen-saturated felt layers offering an economical choice for smaller extensions and outbuildings, with straightforward patch repairs.

 

Each system is selected based on site-specific factors—roof pitch, drainage requirements, insulation needs, and long-term maintenance preferences.

Flat Roofing

Key Benefits

It is generally more cost-efficient than pitched roofs due to lower material and labour expenses; it creates a completely level surface that can be used for solar PV panels, green roof installations, or even roof-deck seating areas; maintenance is simplified since inspections, cleaning, and repairs can be carried out easily without the challenges of steep angles; and, when fitted with reflective membranes, a flat roof can significantly improve energy performance by keeping interiors cooler in summer and reducing air-conditioning bills.
flat roofing Dorset

Areas We Covered

Repairs · Replacements · New Flat Roofs

Flat Roofing in Poole & Dorset

DB Roofing provides flat roof installations, repairs, replacements and maintenance for homes and commercial properties in Poole, Bournemouth and across Dorset.

Whether you have a leaking garage roof, an ageing extension roof or a commercial roof that needs attention, we assess its condition and explain the suitable options. Our approach considers the waterproof covering, drainage, insulation and supporting deck, rather than treating the surface alone.

Our Flat Roofing Services

Flat Roof Repairs, Replacements & New Installations

Every roof needs an approach suited to its construction and condition. We work on domestic and commercial flat roofs, including garages, extensions, outbuildings and business premises.

Flat Roof Repairs

Leaks, damaged coverings and failing edge details need careful assessment. We investigate the affected area and advise whether a targeted repair is suitable or whether more extensive work is needed.

Flat Roof Replacement

Where deterioration is widespread or repairs keep failing, replacement may offer a more practical solution. We assess the existing layers and supporting deck before recommending the scope of work.

New Flat Roof Installation

For new roofs, we consider the building's use, drainage, insulation and connections around walls and rooflights. These details help create a complete weatherproofing system.

Not sure whether your roof needs a repair or replacement?
Tell us about the problem and we can discuss the next step.

Request a Free Quote

Inspections & Maintenance

Regular checks can identify damaged details, debris around outlets and early signs of deterioration. If you have recurring ceiling stains, visible damage or water remaining on the roof after rainfall, arrange an inspection to establish the cause.

DB Roofing flat roofing project

Choosing the Right Flat Roof System

We discuss suitable options such as EPDM rubber, GRP fibreglass, reinforced felt and single-ply membranes. The right choice depends on the roof's construction, exposure, intended use and maintenance needs.

  • EPDM rubber: a flexible membrane option, with careful detailing needed at joints, outlets and roof edges.
  • GRP fibreglass: a rigid waterproof covering that requires suitable deck preparation and installation conditions.
  • Reinforced felt: a layered bituminous system available in specifications suited to different roof requirements.
  • Single-ply membranes: sheet waterproofing systems selected to suit the building and proposed roof specification.

Flat roofs need a designed fall towards drainage outlets. The roof covering, insulation and drainage must work together. Explore our flat roof systems for more information.

Local Flat Roofing Advice for Dorset Properties

On exposed properties around Poole and Bournemouth, wind-driven rain makes sound roof edges and wall connections particularly important. Roofs near trees may need closer attention to leaves and blocked outlets.

For garages and outbuildings, we consider the condition of the deck and existing covering. For extensions and occupied buildings, insulation and moisture management also form part of the assessment. Commercial projects require consideration of access, building use and how the work can be planned around the premises.

We explain the proposed work and provide a quotation based on your roof's requirements, so you can compare the options before proceeding.

DB Roofing roof project photograph

Flat Roofing Areas We Cover

Based in Poole, DB Roofing serves homeowners and businesses in Bournemouth and the wider Dorset area. Choose a location below for more information about our local flat roofing services.

For properties in Wareham or other surrounding areas, contact us with your postcode and a brief description of the work to discuss your project.

Request a Flat Roofing Quote in Poole or Dorset

Tell us your property location, the type of roof and any problems you have noticed. Whether you need a repair or are planning a replacement, we can discuss the next step.

Flat Roofing FAQs

Find out what affects the cost of a flat roof, when a leak can be repaired and which covering might suit your property.

How much does it cost to replace a flat roof?

The cost depends on the size of the roof, access, the covering you choose and whether the decking or insulation needs replacing. Details such as rooflights, wall junctions and drainage can also affect the quote. For a detached garage or outbuilding, see our garage roof replacement guide for more on what the work can involve.

Can a leaking flat roof be repaired?

A local repair may be enough if the leak comes from an isolated split, failed seam or damaged edge and the surrounding roof is sound. If leaks keep returning, the covering is worn in several places or the deck beneath it has softened, replacement may be the better option. An inspection helps establish where the water is getting in and how far the damage extends.

Which flat roof covering is best for an extension or garage?

EPDM rubber, GRP fibreglass and felt can all be suitable. The choice depends on the shape of the roof, how rainwater drains, the condition of the deck and your budget. A simple garage roof and an extension with rooflights and several wall junctions may need different approaches. Compare the options in our flat roof systems guide.

Is it normal for water to sit on a flat roof after rain?

A shallow puddle that clears as the weather dries is usually less concerning than water that repeatedly collects in the same spot. Persistent pooling can point to a blocked outlet, a low spot or too little slope towards the drain. If the pool is getting deeper, the roof looks visibly dipped or you notice damp inside, arrange an inspection.

How long does it take to replace a flat roof?

A straightforward garage roof generally takes less time than a larger extension or commercial roof. Access, weather and any work to the decking, insulation or drainage can affect the schedule. Ask for an estimated timeframe once the roof has been assessed and the scope of work is clear.

Can I upgrade the insulation when my flat roof is replaced?

Yes. Replacing the roof is a good opportunity to review the insulation, especially over a heated extension. The options depend on the existing roof build-up and the space available around door thresholds, rooflights and wall junctions. Raise it when requesting a quote so the insulation and waterproofing can be planned together.

Need advice about your flat roof in Dorset? Request a free flat roofing quote or call 01202 126602.