Expansion joint in gabled slate roof

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Author Message   Kurtis Hord Junior Member Username: Kwhord Post Number: 14 Registered: 10-2006 Posted on Wednesday, February 06, 2008 - 10:29 pm:        Function > Form   Joe Jenkins Senior Member Username: Joe Post Number: 206 Registered: 07-2006 Posted on Monday, January 14, 2008 - 01:18 pm:        I don't understand the detail. A crimped flashing is likely to split over time due to back and forth movement. Expansion joints should probably slide over each other rather than be connected by a crimped metal joint. Back to my original question: why is the slate roof and structure below it being isolated from the rest of the building?   Chuck Volans New member Username: Cvol Post Number: 3 Registered: 01-2008 Posted on Monday, January 14, 2008 - 09:53 am:        Hello Joe, our structural engineer is isolating the slate roof and structure below from it's connection to the adjacent buildings. The expansion joint is 1". The anticipated movement (if any) is 1/2". See the attached detail, this is what is being proposed for the joint at the slate roof. Please let me know if this detail is feasible. Thanks, Chuck Expansion Joint at slate roof UMC-slate_DETAILS.pdf (39.4 k)   Joe Jenkins Senior Member Username: Joe Post Number: 203 Registered: 07-2006 Posted on Friday, January 11, 2008 - 01:00 pm:        Chuck - I don't see what purpose expansion joints would serve in the pdf drawing you submitted. What would be expanding and contracting? The building? Is this a steel building? The slate roof is not going to expand and contract.   Slate Affair Inc. Senior Member Username: Slate_man Post Number: 151 Registered: 01-2007 Posted on Tuesday, January 08, 2008 - 05:04 am:        I would think that it would more or less would be some kind of copper cap, that stands clear of the slate, like you had talked about. This is more for the building then for the slate! In the SMACNA handbook chapter 5 is all expansion joint, that can be modifyed for your application.   Chuck Volans New member Username: Cvol Post Number: 2 Registered: 01-2008 Posted on Monday, January 07, 2008 - 10:22 am:        Thanks for the reply. The structural engineer is requiring an expansion joint to isolate the gabled roof structure and structure below from the adjacent building structures. See the attached PDF drawing file. I've indicated where the expansion joints need to occur. Partial roof plan UMQ-ROOFPLAN_partial.pdf (80.7 k) Any help is appreciated, thanks!   Slate Affair Inc. Senior Member Username: Slate_man Post Number: 148 Registered: 01-2007 Posted on Saturday, January 05, 2008 - 07:16 am:        Why would a slate roof need a expansion joint?   Chuck Volans New member Username: Cvol Post Number: 1 Registered: 01-2008 Posted on Friday, January 04, 2008 - 03:57 pm:        Hello, I'm new to this forum and have a question. Can anyone provide me a link to where I might find a detail for a roof expansion joint in a gabled slate roof. This is a commercial application, not a residential home. The joint occurs where a slate gable roof (slope 5.5/12) abutts another single slope shed type roof (slope 4/12). The expansion joint is required to be 1" clear for movement. I haven't had much luck yet but I'm looking at modifying a NCRA roof expansion joint with a simple metal cap. Unfortunatly, this joint will be seen as it will project above the roof line 8-10". I'll follow up with a PDF drawing attachment shortly to help with the assessment of my situation. I appreciate any assistance. Thank You