Parapet walls are a common feature on Cotham's Victorian terraces and villas, often finishing off a flat-roofed rear addition or forming the boundary of a roof between neighbouring properties. If you're considering EPDM rubber roofing for a roof with a parapet, the good news is that EPDM is well suited to this kind of detail, provided it's installed correctly.
A parapet wall essentially creates a raised edge around part or all of the roof, rather than the roof simply finishing at a gutter line. This means water has to be actively directed towards outlets rather than simply running off the edge, and the junction between the flat membrane and the vertical face of the parapet needs particular attention to stay watertight over the long term.
EPDM's flexibility is a real advantage here. The membrane can be dressed up the face of the parapet and secured either under a coping stone, into a chased groove in the masonry, or under a purpose-made trim, creating a durable seal that accommodates slight movement between the roof deck and the wall without cracking or splitting.
On many older Cotham properties, parapet walls are built in solid masonry that's been in place for well over a century, and the condition of that masonry matters as much as the roofing detail itself. Cracked pointing or porous stonework above the roofline can let water in above where the membrane finishes, which can look like a roofing fault when the actual issue lies in the wall construction - so it's worth having both checked together.
Drainage is another key consideration on parapet roofs, since the raised edges mean water can't simply run off in every direction. Outlets, or in some cases discreet weep holes through the parapet itself, need to be correctly positioned and appropriately sized so that water doesn't sit and pond against the membrane, which would accelerate wear over time.
Getting a parapet detail right takes more care than a simple roof edge, but it's a well-established part of EPDM installation and shouldn't put you off choosing it for a Cotham property with this kind of feature.
Coping stones themselves are worth a mention too, since on many Cotham parapets they're original and can shift slightly or develop cracks over the decades. Where a coping stone isn't properly bedded or sealed, water can get behind it regardless of how well the EPDM membrane below has been installed, so checking the coping as part of any roof assessment is a sensible step.
With the right detailing, a parapet roof can be every bit as reliable and long-lasting as a simpler roof with a standard eaves edge.
If you have a flat roof with a parapet wall in Cotham that needs attention, Brunel Roofing Bristol can assess the roof and the surrounding masonry together and advise on the right EPDM detailing for your property.
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