My setup was installed in 2013. Chimney is triple wall Duravent. Stove pipe is double wall from same mfg. I purchased the entire package from the cap to the stove at the same time making sure that nothing is mixed or mismatched. All has been fine until lase season when I noticed water drops coming from the support box. Obviously, I have a leak somewhere. I have been on the roof, checked all on the sealed areas, looked for cracked or loose shingles etc. Even had a neighbor up there while a sprayed water everywhere but can't find the leak. Any time it rains more than a little, I'm getting the dripping from the support box. Got any ideas? Im about to call a professional roofer out but thought someone out there might have had a similar problem .