Roofing Geometry for Unusual Roof Penatrations

Casa Buena Builders

Victorian houses are beautiful no doubt, but they often present complicated rooflines that require above average designs for flashing.  This problem is one such example.  We were recently commissioned to rebuild this chimney and flash in properly with permanent roofing techniques.  This means no solder, no sealant, and NO cutting corners.  The difficulty in this fabrication is created by a hip intersecting the chimney on the rear corner.  The roof pitch is 10:12 which would be very simple to flash if there wasn’t a hip cutting through the flashing right where a seam is required.


Since we are using a fillet seam, all the transitions and angles must be found in the flat before the pattern is cut out and formed…

First we draw a plan or top-down view:


From the plan we are able to create two sections or side views:



There is one key ingredient missing here though…

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