Replies

1. 
   Terry_Smiley | Jan 28, 2002 01:26am | #1

   *
   blaineellis

   I can help but I need more info. What type of vent? Most roof mechanicals on a flat roof set on top of an elevated curb (9-12" high). If it's a plumbing vent pipe I build a jack that covers the pipe and incorporates an apron which lies on the roof. I braze it together so the torchdown heat doesn't blow it apart.

   Hope this helps, if not please provide more info.

   Terry

1. 
   Ron_Budgell | Jan 28, 2002 05:09am | #2

   *I only do residential work using a nailed down base sheet, so this might be no help, but here goes....The plumbing vent caps, roof vents and pressure relief caps we use are spun aluminum. They are more or less identical, have disc flanges about 15" or 18" and a pipe about 5" in diameter that stands about 15" - 18" high. The plumbing caps have removable covers that fit inside three or four inch pipe (specify). It is usually necessary to cut an existing plumbing vent stack down so these flashings wil work. The roof vent caps have removeable rain covers. Both the plumbing vent covers and the roof vent covers must be fastened to the riser pipe with a screw or two or they will blow off. You lay these things down on top of the base sheet, holding them in place with a nail or two at the edges, and torch the cap sheet over the flange and then add an insurance piece, a second piece of cap sheet 20" or so in diameter cut close to the riser pipe. Cheap. Effective. There are several manufacturers. I don't know any names. I just take what's on hand. Any roofing supplier in North America should have them.

1. 
   piffin_ | Jan 28, 2002 05:37am | #3

   *If you are not experienced or trained in working with modified, I would recommend leaving it alone. Judging the right torch , temp, and flow of work is too critical for an amature. Too many details that you can't learn by asking here.

1. 
   ellis_ | Feb 14, 2002 08:03pm | #4

   *Ron thanks for the reply. I'm installing a chimney for a wood burning stove and a guess my question is can I torch down directly to metal flange of stove pipe weather flange. I understandppetrol products such as wet patch don't work with modified bitumin. blaine

1. 
   Ron_Budgell | Feb 15, 2002 05:26pm | #5

   *You can torch on to any metal that won't melt away from the flame. Keep a garden hose handy. And a pressurized water extinguisher. And a phone to call for help.