What can go wrong with plastic roof edges — and how to prevent it
When it comes to roofing, the layperson often only sees flat surfaces and seams. But it's precisely where different materials meet—such as synthetic roofing and facade finishes—that the biggest problems often arise. This video clearly illustrates and explains three common mistakes: a torn lead flashing, incorrectly installed lead flashing, and a loose bed joint.
A lead flashing is essentially a thin strip of lead that drains roof water away from the junctions between the roof and the facade. The flashing must be flexible and waterproof.
👉 The video shows that the bib is torn .
Consequence: water can seep behind the roof covering, which over time can lead to moisture problems in the facade and interior walls.
Cause could be:
Correctly installing lead flashing is a skilled job. If the overlaps aren't correct or the flashing isn't placed far enough under the roofing material, water can still seep under the roofing.
✔ Good application requires:
The video shows you exactly how this can go wrong — and why it directly affects the roof's waterproofness.
A bed joint is the joint between the roof and the facade, or between the bricks themselves. Properly sealed with sealant or foil, for example, such a joint keeps out wind and water.
In this situation the joint comes loose.
Implications:
This is one of those details where you only realize the importance of good workmanship when it already goes wrong — and that's exactly why the video is so informative.
Whether you do the work yourself or hire a professional:
✔ Pay attention to details
✔ Check material selection and assembly sequence
✔ Always have connections to the facade and roof thoroughly checked
The cost of a building inspection (up to 250 m²) is only €489 including VAT. We'll conduct a comprehensive building inspection and you'll receive a building report. Do you have any questions? We're happy to help and can schedule an appointment with an expert inspector right away if you wish!
