On Monday we met with Brian from Goddard and Carter to discuss a few issues that relate to the intricate cornering details of roofing on the dormer. Perhaps one of the most important details to include is where the dormer roof meets with the pitched roof of the house. We do not want any potential water penetration so these areas are what we identify as weak points within the envelope of the roof.
It might seem more appealing to have smaller, minimal edge conditions while detailing but sometimes those little details can also be the largest problem to solve. Our first issue is in preventing any water running off from the upper roof area penetrating underneath the roofing on the dormer. This requires a layering of sheet metal as well as shop drawings that prescribe custom folds and bends to form a valley to ensure proper drainage and runoff. The second issue is preventing water from penetrating behind the vertical metal siding on the sides of the dormers. We have valley flashing wrapping up behind the vertical pieces to prevent any penetration to the roof decking below. Both of these issues surmount to the third issue of where both conditions converge in the inner corner.
The pictures above display a sample mock-up of how one sheet will layer on top of the other in order to allow for proper drainage. We thank Brian for coming in to clarify with us this crucial detail as well as addressing other issues relating to detailing the roof. Communication throughout the whole design process with contractors and sub contractors is crucial in making sure that both parties are on the same table when it comes to detailing. Brian's mock-up also clarifies the sequencing of placing the roofing material as some of it acts as flashing for other parts of the dormer.
Let's hope that through these sorts of quick, yet highly informative meetings we can successfully ensure proper installation of materials on the house as well as respect our original design intents. After all isn't a major role of an architect to be a problem solver on both the micro as well as the macro scale?
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