Wind uplift protection when the quadruple overlap is missing at the four-tile intersection
The four-tile intersection determines whether an interlocking tile roof covering is truly stormproof. In the video, we show when a side interlock clip is sufficient – and when a head–side interlock clip becomes necessary. A brief practical insight that helps.
The four-tile intersection plays a central role in wind uplift protection on roofs covered with interlocking tiles. Thanks to their specific design, interlocking tiles overlap at their outer edges. They feature side interlocks, head interlocks, foot interlocks and cover interlocks, which together form a secure bond.
In most interlocking tile installations, a quadruple overlap occurs at the four-tile intersection: the third tile overlaps the two underlying tiles. In this case, all three tiles can be securely fixed with a sidelock clip at the side interlock of the third tile.
If the quadruple overlap is missing – for example with hollow tiles without an interlock – fixing the third tile with a side interlock clip alone is not sufficient, as the second tile would remain unsecured at the head. This is where head–sidelock clips come into play: they simultaneously secure one tile at the side interlock and one tile at the head. The result is a secure bond and a stormproof roof covering in compliance with the technical rules.
👉 At the exhibit stand at the FOS trade fair booth 6.309, the installation of the head–sidelock clip 453-2 and the head–sidelock clip 492-2 can be viewed directly.
