Hi My woodstove in the alcove is complete and beautiful. Thanks again for all of the help with design and safety issues. I am now reroofing the house (they went hand in hand) and will be buying a chimney cap. The chimney is actually a steel framed chase with durock exterior and has two flues coming out the top (the kitchen 6" vent and the 8" metalbestos insulated flue) and they are about 4.5" apart, which does not allow for conventional rain collars. I am going to cover the durock in a clinker brick veneer and will need a cover for the chase. As the home is a 1910 craftsman, I figure copper would look better than stainless but am worried about galvanic corrosion with the copper and galvanized ventpipe or raincaps. I will probably have collars put on the copper chase cover but am still worried about what to do to avoid the galvanic reaction. Also, when looking at Rockford and others' descriptions of sending measurements, it appears that they want the holes about .5" larger than diameter of pipe/flue and I worry that caulking will fail in that large a gap (and imagine backer rod cannot be used touching insulated metalbestos). With a collar on a chase cover, is there still a raincap and are those done in copper too? Any recommendations/ideas/suggestions are greatly appreciated and again thanks for all the help getting to this point.