Parapet Flashing on EPDM Roofing

The parapet is the most weather-exposed part of the roof: this is where the vertical, horizontal, and edge of the covering meet. Quality parapet flashing with flash tape bonding ensures that the roof edge remains watertight throughout the entire service life of the covering.

Why parapet finishing is so important

The majority of flat roof leaks occur not through the covering area, but through edges and details—parapets, chimneys, valleys. The EPDM membrane itself is seamless and reliable, but its edge must be correctly folded onto the parapet, bonded with flash tape, and covered with flashing that directs water away from the wall. Skip any of these steps and moisture finds its way into the structure.

Properly executed parapet flashing serves two functions: it mechanically protects the edge of the covering from wind and UV exposure and creates a slope that directs water away from the building wall, not into it. Proper flashing is also recommended by EPDM covering manufacturers—roof edge solutions are described in the recommendations of the international EPDM Roofing Association.

What's included in the service

• Parapet measurements and fabrication of flashings according to required width and shape
• EPDM covering termination on the parapet and flash tape bonding
• Installation of sheet metal flashings with proper slope away from the building
• Sealing of joints and corners
• Work coordinated with covering installation or performed on existing roof

Price

Parapet flashing is calculated by the metre and depends on parapet width, height, and number of corners. For indicative whole-roof price ranges, estimate structure, and sample calculations, see the page EPDM covering price 2026—exact pricing is provided after evaluating the property.

Frequently asked questions

Is parapet flashing necessary for every flat roof?

Yes, if the roof has a parapet. Flashing protects the edge of the covering and directs water away from the wall. Without proper flashing, the top of the parapet and the edge of the covering remain vulnerable to moisture and wind, and this is the first place where the roof starts to leak.

What type of sheet metal are flashings made from?

Painted or galvanized sheet metal, resistant to corrosion, is used. The colour is matched to the building. Flashings are fabricated according to the dimensions of each parapet so that joints are minimal and precise.

Can an already installed EPDM roof be flashed?

Yes. Parapet flashing can be performed both during new roof installation and on an existing roof—for example, if old flashing has worn out or started to leak. The condition of the covering edge needs to be assessed during inspection.

How long does parapet flashing last?

Quality flashing with proper sheet metal lasts for decades—similar to the EPDM covering itself. The key is correct slope and watertight joints, so the work is worth entrusting to experienced professionals.

Is parapet flashing included in the roofing price?

Depends on the quote. Often it is listed as a separate line item, so when comparing several quotes it is worth checking whether parapet flashing and flash tape bonding are included at all. What makes up the EPDM covering price and what it depends on is described on a separate page.