Description: The details show a circular dome capped with a ventilated copper cap. The cap is designed to allow for air to flow out of the dome, while preventing any water, from entering. The cap must also be designed to withstand local wind loads.
On the low-pitch areas near the top of the dome, the seams must be soldered to ensure water- tightness. As the pitch of the dome increases,
At the base, the copper panels are usually 8 to 12 inches square. The practical panel sizes that can be efficiently fabricated and installed are 4 to 6 inches minimum and 16 to 18 inches square, maximum. There are a constant number of panels around the perimeter of the dome. They diminish in size as they get closer to the top.
Diagonal flat lock panels are particularly well- suited for covering
A cornice is shown at the base of the dome. A built-in copper gutter can be used, to control run-off as shown in Detail 13.1E. A copper cap, like the one shown in Detail 13.2A, can be used at the top as an alternative.
The minimum recommended weight for the panels is
Substrate: Continuous nailable substrate.
Fastening Method: Cleats
13.1A. Elevation
This detail shows the continuous panel seam that runs from cornice to
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13.1B. Plan
The diminishing size of the copper panels is clearly visible. When designing this type of dome, consideration should be given to the size of the panels, as they can get very small. If their size becomes too small to construct, panel sizes can be modified by deleting every other seam and doubling the resulting panel size, as shown in the left half of the detail.
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13.1C. Partial Elevation
This elevation shows a typical panel layout on the dome. First, determine the number of full panels required to circle the dome based
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The length of the diagonal of the next course can now be measured directly from the upper points of the previous course.
13.1D. Patterns
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Pattern for Course 6 The dimension DF is determined after the panels for course 5 are laid out.
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13.1E. Section at Cap - Venting
The cap shown is made of 20 oz. copper. Its design allows for air to flow out from the top of the dome. If venting is not desired, a non-venting cap may be used, see Detail E on Plate 4.7.4. The cap
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13.1F. Section at Cornice
This detail is used to transition from the dome to a cornice condition. The cornice cover is turned up, hooked under the first course of the dome panels, and fastened with cleats.
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13.1G. Section at Gutter
This detail can be used to transition from the dome to a built-in gutter. The gutter liner is fastened with cleats at 12" o.c. and is overlapped 4" by the dome panels. A
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For Additional Information:
- Roofing Systems - Introduction, for general information on roofing system requirements.
- Flashing and Copings, under the appropriate sections for flashing details.
- Gutters and Downspouts, for gutter flashing details.
- Wall Cladding Systems - Diagonal Flat Lock Panels, for variations of diagonal flat lock panels.