Replies

1. 
   deblacksmith | Apr 28, 2003 02:46am | #1

   They make a special boot or roof jack for metal roofs.  It can even deal with hitting the standing seem  or rib (so I have been told) -- but it is much better to go through the flat area. (which is what we did).  Your friendly metal roofing contractor should have these -- I could not find them at the local building supply / hardware.  They cost about $ 25 and will work with either 3 inch or 4 inch vents.  FHB showed them in an article on metal roofing -- several years ago -- I don't remenber the issue.

   deblacksmith

1. 
   Poolman | Apr 28, 2003 03:07am | #2

   I have reviewed a couple of boots, one with a plastic "flange", others with aluminium "flange".  As existing roof is galv. steel, seems ther plastic would prevent electrolytic reactions, but am curious as to lifespan of product.  Vents will be 2".

   Thanks, will try to locate product you mentioned.

1. 
   DaveRicheson | Apr 28, 2003 02:15pm | #3

   deblacksmith steered you in the right direction. The flashing boot is is a rubber (synthetic) with a soft metal band around the part that attaches to the roof. The cone of material that slides down over the vent is stepped so it can be cut to fit from 2 to 4 inch pipe.  I got mine a plumping supply. I don't remember the cost.

   You slide the flashing boot over the vent and mark the outline on the roof after forming the metal  to the roof profile. The soft metal  just presses over the ribs or irregularities of the roof. Raise the boot up and caulk inside the scribe line, slide the boot back down, and attach through holes in the metal band with metal building screws.

   Dave

1. 
   Scooter1 | Apr 28, 2003 07:42pm | #4

   The fewer the perforations the better. Try to combine your vent stack(s) into two, preferrably one. PVC is cheap. Leaks aren't.

   Use ice and water shield under this type of roof with an extra layer around all perforations.

   Those boots work great. Add some silicone caulk around the top edge.

   Regards,

   Boris

   "Sir, I may be drunk, but you're crazy, and I'll be sober tomorrow" -- WC Fields, "Its a Gift" 1934

1. 
   Wet_Head | Apr 29, 2003 02:49pm | #5

   PLEASE!

   The directions clearly say to silicone ALL the way around the flashing, not just at the top.