Metal Roof Chimney Flashing...

 
Thread Tools Search this Thread Display Modes
Old 08-06-2010, 10:01 AM   #1
Member
 
Jambruins's Avatar
 
Trade: Professional Engineer
Join Date: Nov 2008
Location: Chazy, NY
Posts: 53
Rewards Points: 79

Metal Roof Chimney Flashing...


I am replacing my shingle roof with a metal roof. My valleys will have to extend to the edge of the roof (see the red lines in the picture) correct? I know with shingles the valley would stop at the side of the chimney but with a metal roof if I stopped the valley there it would dump water underneath my panel. Is my thinking correct? Thank you.
__________________
Moser Engineering
www.jmoserengineering.com
Jambruins is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 08-06-2010, 05:30 PM   #2
Pro
 
red_cedar's Avatar
 
Join Date: Mar 2005
Posts: 767
Rewards Points: 542

Re: Metal Roof Chimney Flashing...


I would consider doing something with your chimney prior to any proposed metal roof. Once the metal goes on your more at a disadvantage with repairing the chimney.
The priniple is the same for metal as with shingles for that detail. It will rely on valley metal lapping onto the panel.

Advertisement


Last edited by red_cedar; 08-06-2010 at 05:32 PM.
red_cedar is offline  
Old 08-06-2010, 07:48 PM   #3
Pro
 
jmiller's Avatar
 
Trade: Roofing
Join Date: May 2010
Location: Indianapolis
Posts: 1,707
Rewards Points: 1,000

Re: Metal Roof Chimney Flashing...


Lose the cricket and save a lot of headache.
jmiller is offline  
Old 08-06-2010, 10:07 PM   #4
copper magnet
 
seeyou's Avatar
 
Trade: custom metal fabrication
Join Date: Dec 2008
Location: Lexington,KY
Posts: 804
Rewards Points: 508

Re: Metal Roof Chimney Flashing...


Quote:
Originally Posted by jmiller View Post
Lose the cricket and save a lot of headache.

Yeah, what I was thinking. Hope the next guy can flash a little better.
seeyou is online now  
Old 08-07-2010, 01:43 PM   #5
Pro
 
red_cedar's Avatar
 
Join Date: Mar 2005
Posts: 767
Rewards Points: 542

Re: Metal Roof Chimney Flashing...


Depending on your long term expectations and the type and kind of 'metal roof' you plan on, losing the cricket could cause standing water.
Standing water overall shortens the life of most materials.
Losing the criket would simplify the installation, no doubt of that, but the detail been referenced would be the same for either a pan or criket ( saddle ),
meaning 'overlapping'.
red_cedar is offline  
Old 08-07-2010, 04:00 PM   #6
Pro
 
PA woodbutcher's Avatar
 
Trade: Remodeling
Join Date: Mar 2007
Location: Northeast, Pa
Posts: 1,965
Rewards Points: 1,000

Re: Metal Roof Chimney Flashing...


No doubt the cricket will be a pain in the ass, but I would keep it, use the valley flashing, flash up the chimney using your own bend and counter flash it.

You can use pre bent end wall flashing against the chimney, but that stuff never lands where I want it to. A nice chimney job takes time.
__________________
When you rob Peter to pay Paul, chances are pretty good you will receive Paul's vote. Apparently the object of the game is to create more Pauls than Peters....What happens when the Peters can no longer support the Pauls? .
PA woodbutcher is offline  
Old 08-07-2010, 09:12 PM   #7
Pro
 
red_cedar's Avatar
 
Join Date: Mar 2005
Posts: 767
Rewards Points: 542

Re: Metal Roof Chimney Flashing...


Valley flashing would just add more work and pieces to the job if the cricket remained. Ff the criket were to remain, get some flat stock and have it bent to the shape of each side and fit them. Thats how I do it. But others ways are good too.

I just read my original post . Its says valley flashing, what I meant is what I wrote here. Metal formed to fit the saddle with the valley portion and extended area lapping onto the panel or shingle below.

Last edited by red_cedar; 08-07-2010 at 11:26 PM.
red_cedar is offline  
Old 08-08-2010, 05:05 PM   #8
New Guy
 
mikebooth's Avatar
 
Trade: general contractor
Join Date: Dec 2009
Location: Franklin, Tn. 37069
Posts: 27
Rewards Points: 25

Re: Metal Roof Chimney Flashing...


Leave the cricket as is. Use 'W' valley in the 2 valleys, pitch break on lower side of chinmey, rake wall on the other 3 sides, for counter, cut brick and install reglet on all 4 sides. You can purchase these items at Metal Sales Inc. Hope this is of some help. You will have to work lower roofing panels in under the valley. That should be the only problem with this chimney.
mikebooth is offline  
Old 08-08-2010, 05:53 PM   #9
Pro
 
Tom Struble's Avatar
 
Trade: siding
Join Date: Mar 2007
Location: west milford n.j.
Posts: 14,849
Rewards Points: 3,802

Re: Metal Roof Chimney Flashing...


get rid of the chimney
__________________
Tom
Tom Struble is online now  
Old 08-08-2010, 10:29 PM   #10
Pro
 
tinner666's Avatar
 
Trade: Roofer, Domains and Hosting
Join Date: Nov 2004
Location: Richmond, Va.
Posts: 2,456
Rewards Points: 1,000

Re: Metal Roof Chimney Flashing...


A 20" chimney doesn't need a cricket. Start panels from both sides of the chimney, Make a pan with folded hem on top, a lock strip midway up the pan, about 12", and incorporate the pan into the roof panels on either side of the chimney. Put on your upper panels, and fill in the center panel(s).

Though a skyligh, the same principal applied.
Attached Thumbnails
Metal Roof Chimney Flashing...-good-view.jpg  
__________________
Frank Slate Roof Repairs, Richmond, Va.
tinner666 is offline  
Old 08-13-2010, 03:57 PM   #11
Gutter-Maker
 
Ghostbeard's Avatar
 
Trade: Gutter & Downspouts
Join Date: Aug 2010
Location: Atlanta
Posts: 10
Rewards Points: 10

Re: Metal Roof Chimney Flashing...


Quote:
Originally Posted by tinner666 View Post
A 20" chimney doesn't need a cricket. Start panels from both sides of the chimney, Make a pan with folded hem on top, a lock strip midway up the pan, about 12", and incorporate the pan into the roof panels on either side of the chimney. Put on your upper panels, and fill in the center panel(s).

Though a skyligh, the same principal applied.
Yea, with copper thats fine. Not Steel. Standing water and deflection moisture issues can cause "edge-Creep" and this detail will void most panel finish warranties.

I would find out first, from the panel supplier, what they recommend or what their CAD drawings show. to deflect any future problems back to them, if you occur one with there recommendation.

I believe they would reccomend a cricket, muck like they would any "curb" type application.
Ghostbeard is offline  
Old 08-14-2010, 12:19 PM   #12
Pro
 
jmiller's Avatar
 
Trade: Roofing
Join Date: May 2010
Location: Indianapolis
Posts: 1,707
Rewards Points: 1,000

Re: Metal Roof Chimney Flashing...


Quote:
Originally Posted by Ghostbeard View Post
I would find out first, from the panel supplier, what they recommend or what their CAD drawings show. ...
I believe they would reccomend a cricket, muck like they would any "curb" type application.
I've looked at the drawings for his panel mfgr (from past threads of his) and they don't have a curb detail. This stuff usually goes on barns, which tend to not have chimneys or curbs.
jmiller is offline  
Old 08-14-2010, 01:45 PM   #13
Pro
 
Framer53's Avatar
 
Trade: Handyman
Join Date: Jan 2009
Location: Utica,NY
Posts: 2,382
Rewards Points: 1,336

Re: Metal Roof Chimney Flashing...


Seeing as the OP is in upstate New York, the cricket is an essential part of the roof. To loose it is to invite even more problems.
Framer53 is online now  
Old 08-14-2010, 01:54 PM   #14
Pro
 
232323's Avatar
 
Trade: remodeling contractor
Join Date: Mar 2008
Location: MT
Posts: 175
Rewards Points: 154

Re: Metal Roof Chimney Flashing...


I agree with Tom...remove the brick chimney just below the roof sheathing. You or your heating contractor should be able to drop a metal liner into the existing chimney then you could use a conventional jack, storm collar & cap on the roof. If this is possible, it will look alot better and save you alot of work.
232323 is offline  
Old 08-23-2010, 05:26 PM   #15
Don't Eat Yellow Snow!
 
English Roofer's Avatar
 
Trade: Pro Slater and Roofer
Join Date: Dec 2008
Location: Warrington England
Posts: 400
Rewards Points: 250

Re: Metal Roof Chimney Flashing...


Just one question? who pointed the back of the chimney!!! Stevie Wonder!!
Cheers
Dave
__________________
' I can resist anything but temptation' Oscar Wilde

www.drroofing.co.uk
English Roofer is offline  
The Following 2 Users Say Thank You to English Roofer For This Useful Post:
Framer53 (08-24-2010), seeyou (08-23-2010)
Old 08-23-2010, 05:34 PM   #16
Pro
 
Tom Struble's Avatar
 
Trade: siding
Join Date: Mar 2007
Location: west milford n.j.
Posts: 14,849
Rewards Points: 3,802

Re: Metal Roof Chimney Flashing...


isn't she lovely?
__________________
Tom
Tom Struble is online now  
The Following User Says Thank You to Tom Struble For This Useful Post:
seeyou (08-23-2010)
Old 08-24-2010, 08:34 AM   #17
Member
 
Jambruins's Avatar
 
Trade: Professional Engineer
Join Date: Nov 2008
Location: Chazy, NY
Posts: 53
Rewards Points: 79

Re: Metal Roof Chimney Flashing...


We bought the house from my wife's grandmother after her grandfather passed away. He was an old farmer who basically fixed things just enough so they worked so he could get back to the farm. I am not sure if he did the chimney but I am guessing he did. Every project I do around the house always has some unexpected surprises. Thanks for all the help.
__________________
Moser Engineering
www.jmoserengineering.com
Jambruins is offline  
Old 08-24-2010, 06:51 PM   #18
Roofing and Architectural
 
Renegade's Avatar
 
Trade: Roofing and Architectural Metals
Join Date: Feb 2008
Location: Idaho
Posts: 619
Rewards Points: 646

Re: Metal Roof Chimney Flashing...


Quote:
Originally Posted by English Roofer View Post
Just one question? who pointed the back of the chimney!!! Stevie Wonder!!
Cheers
Dave
It's a coded msg. I think it says "F*** all you smart-ass roofers!"
I concur with tinner. Cricket is not necessary on that small a chimney. A pan will do fine.
Renegade is offline  
Old 08-24-2010, 06:56 PM   #19
Roofing and Architectural
 
Renegade's Avatar
 
Trade: Roofing and Architectural Metals
Join Date: Feb 2008
Location: Idaho
Posts: 619
Rewards Points: 646

Re: Metal Roof Chimney Flashing...


Quote:
Originally Posted by Ghostbeard View Post
Yea, with copper thats fine. Not Steel. Standing water and deflection moisture issues can cause "edge-Creep" and this detail will void most panel finish warranties.

I would find out first, from the panel supplier, what they recommend or what their CAD drawings show. to deflect any future problems back to them, if you occur one with there recommendation.

I believe they would reccomend a cricket, muck like they would any "curb" type application.
If I had the time I could show you a half dozen mfr's pan detail for this application. In fact walk down the street to Imetco's office and ask them.

Last edited by Renegade; 08-24-2010 at 06:58 PM.
Renegade is offline  
The Following User Says Thank You to Renegade For This Useful Post:
seeyou (08-24-2010)
Old 01-12-2013, 09:24 AM   #20
Member
 
ets80's Avatar
 
Trade: roofing
Join Date: Dec 2012
Location: Chicago
Posts: 79
Rewards Points: 75

Re: Metal Roof Chimney Flashing...


I concur, do you use a saddle behind skylights? A 20" chimney doesn't need a cricket. Start panels from both sides of the chimney, Make a pan with folded hem on top, Put on your upper panels, and fill in the center panel(s).

Advertisement

ets80 is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Um, what is flashing ??? theflynner Roofing 13 03-20-2011 06:33 PM
Roof Estimating And Drawing Program Ed the Roofer Roofing 32 03-07-2011 10:50 AM
NEW Roof Leak at the chimney !! TheLastDaze Roofing 18 01-29-2010 08:20 AM
Flat roof installers! Metal roof installers! cms_roofing Help Wanted or Looking For Work 0 10-01-2009 10:54 PM
Metal chimney replacement trade Construction 5 04-06-2009 01:35 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?