Question about Roof Jacks

Reply

  #1  
Old 09-13-10, 12:14 PM
Member
Thread Starter
Join Date: May 2010
Location: USA
Posts: 16
Received 0 Votes on 0 Posts
Question about Roof Jacks

I am planning on using relatively inexpensive roof jacks from the local hardware store for my sewer vents. They have a rubber seal that you can cut to adapt to various size pipes (1.5-4 inches). I have heard that the rubber can fail over time.
Has anyone had experience with these? Are they reliable?

The more traditional jack has a large pipe and rain cap but the rubber-seal type has a much cleaner look.

Victor
 
Sponsored Links
  #2  
Old 09-13-10, 12:36 PM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,117
Received 1 Vote on 1 Post
The rubber can fail over time with exposure to the elements. Mine in VA were pretty deteriorated after 16 yrs. Guess what? They make replacement rubber that slides down over the pipe and is siliconed in place over the old one. Works just fine.

http://www.plumbingsupply.com/roofflashings.html

Also...I'd use flashings that don't have that large a range (not that I've ever seen them). Most are something like 1 1/4-2, 2-3, 3-4. One slip when cutting and you won't get a good seal with a 1 1/2-4" range.
 
  #3  
Old 09-13-10, 01:23 PM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 33,597
Received 13 Votes on 11 Posts
I still like the lead ones or have the environmentalist killed those?
 
  #4  
Old 09-13-10, 01:36 PM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,117
Received 1 Vote on 1 Post
Yeah....I think those are probably gone ray.

Out here almost everyone use the galvanized type and then just lay on a bunch of roof tar. That lasts about 2 years.

The bath and kitchen fan vents all had those T style jacks, which with the wind here, blew air in as often as out.

OH...VV...I would recommend using the galv flashing with the rubber seals if thats the way you want to go. The seal is easy to fix if req'd....removing the entire thing isn't. Galv will prob last much longer than the plastic ones.
 
  #5  
Old 09-13-10, 04:50 PM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 21,008
Received 226 Votes on 208 Posts
I used the roof jacks with the rubber boot slid over the PVC vent pipes on my house. They started to crack after 4 years. I painted them with roofing tar and I've not noticed any more deterioration since. I assume the tar is providing protection from UV and ozone for the rubber underneath.
 
  #6  
Old 09-13-10, 05:02 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 23,319
Received 216 Votes on 201 Posts
Lead boots are still available.
 
  #7  
Old 09-13-10, 10:33 PM
Member
Thread Starter
Join Date: May 2010
Location: USA
Posts: 16
Received 0 Votes on 0 Posts
I decided to get the galvanized jack with the opening sized
specifically for each pipe. Then I will use a rubber seal that slips over the pipe and jack. The nice thing is that if the
rubber seal ever fails, I can just buy a new one and slip
it on.

One problem I ran into is that I am using Presidential roofing
which installs more like shake and therefore needs a larger
roof jack. The ones with the integral rubber seals are
pretty small and were not suitable.

Thanks for everyone's advice!

Victor
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: