Flat Roofing in Soham

Expert Flat Roofing
in Soham

What flat roofing work actually involves

A flat roof is not truly flat. It sits at a slight pitch, typically between 1 and 5 degrees, so rainwater drains to one side and into a gutter rather than sitting in the middle. When that fall is wrong, or when it shifts over time, water pools and the membrane beneath it starts to fail. On extensions and garages, this is the most common source of recurring leaks.

The three main systems used today are traditional built-up felt, EPDM rubber, and modern torch-on felt. Each has different characteristics for longevity, repairability, and upfront cost. Knowing which suits your building is part of choosing the right contractor, not just accepting whatever a roofer happens to carry in their van.

How to choose a flat roofing contractor in Soham

Flat roofing is a trade where the quality of the installation matters far more than the materials themselves. A cheap felt job laid without proper preparation will fail within a few years. A well-laid EPDM membrane, properly primed and bonded, can last twenty years or more. The difference comes down to the person doing the work, not the price on the quote.

Before you agree to any flat roofing job, ask these questions directly. If a contractor cannot give clear answers, that tells you something useful before any money changes hands.

• What system are you recommending, and why is it right for this roof? A good roofer will explain the drainage fall, the deck condition, and why the chosen membrane suits both. If the answer is vague, push back.
• Will you strip the existing layers, or overlay on top? Overlaying an old felt roof with a new layer can trap moisture and add weight. Stripping back to the deck is usually the right call, and a contractor who skips it is cutting corners.
• What condition is the decking in, and will you check it before quoting? Wet, rotted OSB or plywood decking is a hidden cost. A reputable contractor will inspect the deck properly before pricing the job, not after they have started and found a problem.
• How will you handle the upstands and flashings? Where a flat roof meets a wall or parapet, a watertight upstand and lead or aluminium flashing is essential. Ask specifically how these junctions are dealt with, because they are where leaks most often start.
• Can you walk me through how the drainage will work? Outlets, gutters, and fall direction should be explained clearly. On a large flat roof, a single outlet is often not enough.

What to ask about the quote itself

A written quote should itemise the work clearly: removal of existing materials, deck inspection and any repairs, the specific membrane being laid, upstand and flashing details, and disposal of old materials. A quote that simply says "flat roof replacement" without breakdown is not enough to compare against others.

Get at least two quotes, ideally three. If one comes in significantly lower, find out exactly what has been left out. Common omissions include deck repairs, scaffold or access costs if the roof requires it, and disposal charges. Typical flat roof installation costs in the UK currently run from around £70 to £120 per square metre for felt systems and from £90 to £150 per square metre for EPDM rubber, depending on roof size, deck condition, and access. These figures are a guide; a proper site inspection is the only way to get a price that reflects your actual roof.

Red flags to watch for

Some warning signs are worth knowing before you start approaching contractors. A roofer who asks for full payment upfront before any work begins is a risk. A staged payment, part on starting and the remainder on satisfactory completion, is normal practice. Anyone who cannot or will not provide a written quote should be avoided.

Be wary of cold-calling roofers who knock on your door and tell you they have noticed a problem with your roof from the street. Flat roofs are rarely visible from ground level on extensions and garages. Ask anyone you do not recognise for a company name and address, and check them independently before agreeing to anything.

EPDM rubber versus felt: which is better for your roof?

EPDM is a single-ply rubber membrane that is bonded to the deck in large sections, with very few joins. Fewer joins mean fewer potential leak points. It handles temperature swings well, staying flexible in frost without cracking. It is typically more expensive than felt upfront but requires less maintenance over its lifespan.

Traditional torch-on felt uses layers of bitumen felt, heat-welded together. It is a proven system and well understood by most roofers. The top cap sheet on a quality felt system will include a mineral surface or self-finished surface that resists UV degradation. Both systems, properly installed, can provide many years of reliable performance. The choice often comes down to the size and shape of the roof, access to the deck, and budget.

Drainage and falls: the part most often overlooked

Drainage performance is critical on any flat roof. In heavy rain, a poorly drained flat roof can hold several centimetres of standing water. That weight is a problem for the structure, and the water itself will find any weakness in the membrane within months. A good roofer will check or create a proper fall toward the outlet before any membrane goes down, and will size the outlet or gutter appropriately for the roof area.

If your existing flat roof always seems to pond water after rain, the fall may have never been correct, or the structure has shifted over time. This is worth raising explicitly when you ask for a survey.

Flat roofing for extensions and garages near Soham

Extensions and garages are the most common flat roofing jobs. On an older roof, a full replacement is usually more cost-effective than repeated patch repairs.

Call us to arrange a flat roof inspection in Soham and we will give you a clear written assessment of what the roof needs and why.