Is the PV roof duct waterproof?
Short and honest: The roof duct itself is not a sealing element – it protects your solar cable from chafing on the tile edge (abrasion protection). As always, the professional tiling of your roof ensures rain resistance. Anyone who promises you a "100% waterproof" individual duct is oversimplifying.
Where the watertightness truly comes from
A tiled roof is an overlapping, ventilated system. It is not "sealed" at a single point; rather, rain resistance is achieved through the tiling and – where necessary – the underlayment. If you try to "seal" a single penetration with a lot of silicone, problems are more likely to arise in the long term: silicone becomes brittle under UV, cracks, and allows water to get underneath.
What the duct truly provides: Abrasion protection
If your solar cable runs unprotected over the sharp tile edge, the insulation will chafe through over the years – this is the most common cause of later cable damage. The NEXCAPE roof duct made of UV-resistant TPU sits between the cable and the tile, protecting the cable. Pure, mechanical abrasion protection – honestly stated.
How to properly route your solar cable through the tiled roof
- Lift the appropriate tile and place the duct on the support edge.
- Insert the cable, including the MC4 connector, from the side – no cutting necessary.
- Hang the duct into the tile, replace the tile.
- Ensure rain resistance through proper tiling – as with any roof penetration.
FAQ
Is the duct waterproof? It is an abrasion protector, not a sealing element. Watertightness comes from the tile covering.
Do I need to seal it additionally? The critical task is to protect the cable from abrasion. You ensure rain resistance through professional tiling – no silicone "gluing" of the duct.
What size do I need? 105 mm is standard for tiled roofs, 125 mm for Frankfurter/Finkenberger Pfanne, 150 mm universal. More information in our size buying guide.
Do I have to cut the MC4 connector? No, the cable is inserted with the connector.
You can find the appropriate sizes in our PV roof ducts – TPU, Made in Germany.
Matching PV roof ducts from our factory: All PV roof ducts · DIY version without MC4 removal · 125 mm for Frankfurter Pfanne · 150 mm for almost all roof tiles
