Is there a Dektite product you can use to flash a square penetration through a roof?
Yes, you will need to use a Dektite Combo Square flashing. It is specifically designed for both new installations and retrofit. Special clips are provided with each unit for retrofit applications. Suitable for square penetrations between 20mm (¾”) and 125mm (5”).
For larger square penetrations, use Dektite Diverters, DekStrip, Perform or Fast Flash.