Flat Roofing in Newmarket - Materials and Your Options Explained

Expert Flat Roofing
in Newmarket

What We Do

Haverhill Roofers carries out flat roof replacements and repairs on garages, single-storey extensions and dormers for homeowners in Newmarket and the surrounding area. We work with traditional felt and EPDM rubber membranes, and we are honest with every customer about which material suits their situation and budget.

We cover Newmarket and neighbouring villages, including Linton, Sturmer and Steeple Bumpstead, as well as parts of Suffolk and the Cambridgeshire border area. Failing flat roofs need replacing, while ones that still have useful life left in them can be repaired.

The Two Main Flat Roofing Materials

Most domestic flat roofs are either felt or EPDM rubber. There are other systems on the market, but for garage roofs, extensions and dormers these are the two that make practical and financial sense for the majority of homeowners. Here is what you need to know about each.

Felt Flat Roofing

Felt has been used on flat roofs for decades and it remains a viable option when it is specified and laid correctly. Modern torch-on felt is not the same product as the thin, nailed felt used on older garden sheds. A quality felt system uses two or three layers of bitumen-based sheet, torch-bonded together and to the deck, with a mineral-surfaced cap sheet on top.

Lifespan: A well-installed torch-on felt system can last 15 to 20 years. Cheaper single-layer systems installed by builders rather than roofers will often fail well before that.

• Lower upfront cost. Felt is generally the more affordable option at the point of installation, which makes it attractive when budget is the primary concern.
• Widely understood. Most roofers are familiar with torch-on felt, so you have more options when it comes to getting the work done or repaired in future.
• Repairs are straightforward. Small localised failures - a split lap, a cracked upstand detail - can be patched with compatible felt material relatively easily.
• Vulnerable to UV degradation. Bitumen felt oxidises over time. The surface becomes brittle, cracks appear and the membrane starts to fail. This is normal ageing, not a sign of poor installation, but it does mean the roof needs monitoring as it gets older.
• Thermal movement. Felt can be susceptible to splitting at upstands and abutments where the roof meets a wall, because the material expands and contracts with temperature changes and the bond at vertical details is under the most stress.
• Not the longest option. If you want a roof that you genuinely do not have to think about for 25 or 30 years, felt is not the best choice.

EPDM Rubber Flat Roofing

EPDM stands for ethylene propylene diene monomer - it is a synthetic rubber membrane that has been used on flat roofs since the 1960s and has an excellent long-term track record. On domestic properties it is typically installed as a single sheet bonded to the deck, which eliminates the laps and seams that are the most common failure point on felt roofs.

Lifespan: EPDM rubber membranes are typically rated for 30 to 50 years by manufacturers. In practice, well-installed EPDM roofs on domestic garages and extensions have a strong record of lasting that kind of time without significant intervention.

• Excellent UV resistance. Unlike bitumen felt, EPDM does not oxidise or become brittle in sunlight. It stays flexible across a wide temperature range, which means it handles thermal movement well without cracking.
• Single-sheet installation. A garage or small extension roof can often be covered in one piece of membrane with no mid-field laps. This removes one of the most common sources of failure.
• Lightweight. EPDM is significantly lighter than torch-on felt, which matters on older timber structures where loading is a consideration.
• Handles ponding water well. EPDM is unaffected by standing water, which is a real advantage on flat roofs where drainage falls are minimal.
• Higher upfront cost than felt. The material and installation cost more than a comparable felt system. Over the lifetime of the roof, however, EPDM often works out cheaper because it needs less maintenance and lasts considerably longer.
• Repairs need the right materials. While EPDM is not difficult to repair, you need compatible EPDM adhesive and patch material. Standard felt patches will not bond correctly to a rubber membrane.
• Aesthetics. EPDM is black by default, which some homeowners dislike on a visible roof. It can be coated, but in most practical situations it is not seen from ground level.

Which Material Is Right for Your Roof?

The honest answer is that EPDM is the better technical product for most flat roofs on domestic extensions and garages. It lasts longer, handles the conditions better and requires less maintenance over its lifetime. If budget at the point of installation is genuinely tight, a well-specified felt system is a reasonable alternative - but get three layers of torch-on felt, not a single-layer system.

Where felt sometimes makes more sense is when you are doing a short-term repair on an older structure that you know will be replaced or altered in the near future. There is little point spending more on EPDM if the garage is coming down in five years.

For dormers specifically, EPDM tends to be the preferred choice. Dormers are exposed at height, and the continuous sheet installation suits the awkward shapes and upstand details that dormers typically involve.

What About the Deck and Insulation?

The membrane is only as good as what is underneath it. Before any new covering goes down, the timber deck needs to be checked. Rotten or soft boards must be replaced - no membrane will perform well over a failing deck. Falls should also be checked and corrected if needed, because a flat roof that pools water puts unnecessary stress on any membrane over time.

Insulation is worth considering at replacement time. Modern flat roof build-ups use rigid insulation boards above the deck (a warm roof configuration) to prevent condensation within the structure and bring the roof up to current thermal standards. This adds to the cost of the job but often pays back over time in heating bills and reduced condensation problems in the room below.

Typical Costs

Flat roofing costs in this part of East Anglia vary depending on the size of the roof, the material chosen, the condition of the existing deck, and whether insulation is being upgraded. As a rough guide, a standard single-garage roof replacement in felt typically costs in the region of £800 to £1,500. The same job in EPDM rubber is generally £1,000 to £1,800. These are rough benchmarks only - get a proper assessment and written price before committing to any work.

Areas We Cover Around Newmarket

We cover Newmarket and the surrounding area from our base in Haverhill. Nearby villages and towns we work in include Linton, Saffron Walden, Sturmer, Steeple Bumpstead and Great Sampford. If you are not sure whether we cover your area, call us and ask.

Get a Clear Price for Your Flat Roof in Newmarket

Call us to arrange an assessment of your flat roof. We will look at the existing roof, tell you what material we recommend and why, and give you a clear price for the work.