A new flat roof in Cottenham is only the beginning - what you do in the years after installation determines how long it performs and what it costs you to keep it watertight.
Flat roofs have a reputation for being troublesome, and in many cases that reputation is earned by neglect rather than by the roofing material itself. A well-installed EPDM rubber or torch-on felt roof can last 20 to 30 years, but only if small problems are caught before they become large ones. The design of a flat roof - low pitch, membrane exposed to the sky, edges prone to lifting - means that small maintenance tasks have an outsized effect on longevity.
The good news is that most of the useful maintenance a homeowner can carry out is simple, requires no tools, and takes less than an hour a year. Knowing what to look for and when to call a roofer is far more valuable than any product or treatment.
A flat roof that cannot drain properly will deteriorate faster than almost anything else will cause it to. Water sitting on the membrane for extended periods - known as ponding - adds load to the deck, degrades the membrane surface, and can force its way through any minor imperfection in the waterproofing. Ponding that freezes in winter expands, and that expansion opens cracks and lifts edges.
Roof outlets - the drain points built into the membrane - should be checked and cleared twice a year: once in late autumn after leaf fall and once in spring. Leaves, moss fragments, and debris collect in the outlet and slow drainage significantly. From ground level or a safe ladder position at the gutter, you can often see whether an outlet cover is blocked. A blocked outlet on a flat roof can cause water to back up against an upstand and eventually find its way into the building.
Gutters connected to flat roofs need the same attention. A gutter running along the low edge of a flat roof that is blocked will hold water against the drip edge or fascia trim, and that water will eventually track back under the membrane edge. Clearing gutters in November and March costs nothing but time.
You do not need to walk on the roof to carry out a useful inspection. From a stable ladder at the edge, or even from an upstairs window if the roof is below, you can assess most of the things that matter.
Moss grows on flat roofs, particularly in areas of shade. On a mineral-surfaced felt roof, moss holds moisture against the surface and can lift the mineral granules as it spreads. On EPDM, moss does not bond to the rubber in the same way but its root structure can, over time, work into any seams or edge details.
Biocidal treatments applied by brush or spray can slow moss growth, but physically removing established moss first is important. Scraping moss off a mineral felt roof must be done gently - aggressive scrubbing removes the granule layer that protects the felt from UV. If moss has become thick and established, it is worth having a roofer treat and clear it rather than risking damage to the surface by doing it yourself.
Do not pressure-wash a flat roof membrane. The force of a pressure washer can lift seams, force water under edge trims, and strip the granule surface from felt. A soft brush and a diluted biocide applied carefully is the right approach.
If you notice damp patches on the ceiling below the flat roof, or see obvious membrane damage during a visual check, the priority is to prevent further water ingress while you arrange for a proper inspection. A temporary cover - a weighted tarpaulin over the problem area - can reduce water entry, but it needs to be secured at the edges rather than just laid flat, or wind will remove it.
Resist the temptation to apply roofing sealant or waterproofing paint from a DIY store over a leaking area. These products can make a proper repair harder later, because the new material does not always bond well to the old membrane through the sealant layer. In some cases a temporary sealant application masks the entry point while water continues to track to a different point and enters elsewhere. An inspection by an experienced roofer will find the real source of the leak, which is often not directly above where the water appears inside.
A simple annual routine for a flat roof in Cottenham might look like this:
Some things are not maintenance tasks and should not be attempted by a homeowner. Re-adhering a lifting upstand, replacing a failed outlet collar, re-dressing a lead flashing, or patching a split in the membrane all require the right materials, the right technique, and an understanding of how the rest of the membrane will behave. A botched DIY repair can spread a problem that was previously contained.
A small professional repair - a roofer attending to re-bond a lifting upstand or reseat a flashing - typically costs between £150 and £350 depending on the extent of the work and access requirements. That is considerably less than dealing with ceiling replacements and structural timber drying out after a winter of slow water ingress.
Newmarket Roofers carry out flat roof maintenance inspections, repairs, and full replacements in Cottenham and the surrounding area. If you have spotted something that concerns you, or if your flat roof has not been looked at professionally in the last few years, call us to arrange a proper roof-level inspection and we will tell you honestly what it needs.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
