Pitched To Flat Transition - Roofing - Contractor Talk

Pitched To Flat Transition

 
Thread Tools Search this Thread Display Modes
Old 05-06-2006, 09:23 AM   #1
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Pitched To Flat Transition


What's the accepted method for this transition? I'll be using a two ply torch-on on the flat with arch lams on the pitch. Run the glass base up the pitch, I&W, 30# ? The 'flat' will actually be 1:12. The pitch is 5:12. Thanks guys, Rich.
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl 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 05-06-2006, 09:41 AM   #2
Pro
 
MJW's Avatar
 
Trade: General Contractor, Roofing, siding, windows
Join Date: Jan 2006
Location: MN
Posts: 1,934
Rewards Points: 1,772

Re: Pitched To Flat Transition


I would use a valley tin or some strong metal. Some don't use anything, just run the shingles down onto the torch down. I would be more comfortable with some metal in there.

Advertisement

MJW is offline  
Old 05-06-2006, 10:19 AM   #3
Pro
 
RooferJim's Avatar
 
Trade: roofing
Join Date: Mar 2006
Posts: 536
Rewards Points: 500

Re: Pitched To Flat Transition


Run the flat roofing up under the transition a min. 24" under your shingle coursing its also a good idea to nail of the top of the plies with buttons then overlap it with the shingle underlayment whether it be felt or I&W. metal base flashing is really only good if its put on by a good metal man and has locked and solderd joints "fully sweated and laced with properly heated irons". You can always tell a real cornice man by how he solders.

RooferJim

www.jbennetteroofing.com
RooferJim is offline  
Sponsored Links
Advertisement
 
Old 05-06-2006, 02:45 PM   #4
Commercial Roofing
 
AaronB.'s Avatar
 
Trade: Roofing Contractor
Join Date: Oct 2004
Location: Illinois IL
Posts: 1,220
Rewards Points: 500

Re: Pitched To Flat Transition


Is it a two ply torch system, or a one ply base and one ply torch?

If it is a one ply torch, then run the filed sheet up six inches onto the shingle area, then flash the transition with another piece, laying six inches on the low slope and the rest of the sheet up the steep slope.

If you do not have extensive experience with torch systems, I wouldl suggest hiring a licensed, insured pro to do this part of the work. Be careful, as most "construction" type policies do not cover open flame work. There is a very real and serious risk of fire in this scenario.
__________________
http://www.roseroofing.net/
Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.

Last edited by AaronB.; 05-06-2006 at 06:01 PM.
AaronB. is offline  
Old 05-06-2006, 10:50 PM   #5
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Re: Pitched To Flat Transition


Thanks for the input guys,it will be a one ply base, one ply torch, that's the system I'm familiar with. Aaron, when you say "then run the filed sheet up six inches", what are we talking here, the base sheet? both? I get the six inch part, just the layer I'm not clear on.
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl is offline  
Old 05-06-2006, 11:08 PM   #6
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Re: Pitched To Flat Transition


Never mind Aaron, just went out for a smoke and got what you're saying, thanks, Rich.
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl is offline  
Old 05-07-2006, 09:58 AM   #7
Commercial Roofing
 
AaronB.'s Avatar
 
Trade: Roofing Contractor
Join Date: Oct 2004
Location: Illinois IL
Posts: 1,220
Rewards Points: 500

Re: Pitched To Flat Transition


Yeah, run the base up to the termination point of the flashing.

Doing it this way and getting the sheet membranes tight to your transition will give you a double layer in the transition and a nice solid flashing of said transition.

BE CAREFUL...YOU CAN BURN YOUR HOUSE DOWN WITH THIS SYSTEM!
__________________
http://www.roseroofing.net/
Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.
AaronB. is offline  
Old 05-08-2006, 12:49 PM   #8
Registered User
 
Grumpy's Avatar
 
Trade: Roofing and Gutter Specialist
Join Date: Oct 2003
Location: Chicago
Posts: 8,573
Rewards Points: 2,000

Re: Pitched To Flat Transition


I'd run the flat membrane up the pitched section at very least 1.5'. I would then overlap that with my ice shield covering about 1' of the overlap, assuming ice shield is compatible with the roof membrane because some are not (EPDM). I would then continue with my regular 'ol 30#, I would then NOT want to shingle all the way down, just just enough to cover my ice shield and maybe one coarse of shingles below the ice shield.

This is how we've been doing it for years and never a problem.
__________________
-Grumpy
Chicago Gutters Chicago Roofing
Grumpy is offline  
Old 05-28-2006, 11:06 PM   #9
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Re: Pitched To Flat Transition


Sorry to beat this point to death, fellas, but...

So I do it like Aaron says and wind up with two layers of torch-on in the transition, the upper one extends up the slope about 30". No problems here, that makes sense. But then I come along and start nailing archs level with the transition? So now I've got nail holes all through it about 5" up? I guess this is where the I&W comes in, can you use that stuff over the torch-on? Am I just being paranoid and should just go ahead and do it? Tks, Rich.
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl is offline  
Old 05-28-2006, 11:48 PM   #10
 
fettycan's Avatar
 
Join Date: Mar 2006
Posts: 43
Rewards Points: 25

Re: Pitched To Flat Transition


yes
fettycan is offline  
Old 05-29-2006, 12:10 AM   #11
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Re: Pitched To Flat Transition


: "Yes" what?
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl is offline  
Old 05-29-2006, 09:20 AM   #12
 
fettycan's Avatar
 
Join Date: Mar 2006
Posts: 43
Rewards Points: 25

Re: Pitched To Flat Transition


I&W over and nail on your shingles. ( paranoid ) no just concerned
when you shingle across this part you still need a double row to cover the ends where the shingles butt together and yes just go ahead and do it
fettycan is offline  
Old 05-29-2006, 01:16 PM   #13
Commercial Roofing
 
AaronB.'s Avatar
 
Trade: Roofing Contractor
Join Date: Oct 2004
Location: Illinois IL
Posts: 1,220
Rewards Points: 500

Re: Pitched To Flat Transition


I would clean the talc off the surface of the modified if youre going to use the Ice barrier to get better adhesion, but I actually would leave a course or two out at the tranistion to make sure there would not be fututre problems.
__________________
http://www.roseroofing.net/
Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.
AaronB. is offline  
Old 05-30-2006, 12:32 AM   #14
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Re: Pitched To Flat Transition


Thanks for the help, guys, got the torch-on down, glad it's my place, 'cos I don't think I'd be happy with trying to sell this to a customer. It's not gonna leak or anything, but aesthetically it leaves a little to be desired. Particularly where the flat roof meets the valley, what a nightmare to get the torch-on to lay down flat w/o wrinkles. If I ever get a contract for this I'll be subbing it out and watching.

Aaron, I like the idea of starting the shingles up a course or two, that makes sense, what's this talc that you're talking about? Anyhow, tks again for helping me through that, I'm back on familiar ground now. Rich.
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl is offline  
Old 05-30-2006, 06:20 AM   #15
Commercial Roofing
 
AaronB.'s Avatar
 
Trade: Roofing Contractor
Join Date: Oct 2004
Location: Illinois IL
Posts: 1,220
Rewards Points: 500

Re: Pitched To Flat Transition


Well, if it is a smooth surfaced material, most of them come with a talc on the surface to prevent the bitumen from sticking together.

Granulated does not.

Does your modified look like this?

__________________
http://www.roseroofing.net/
Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.
AaronB. is offline  
Old 05-30-2006, 10:13 PM   #16
Pro
 
reveivl's Avatar
 
Trade: Renovations
Join Date: May 2005
Location: West Coast Canada
Posts: 1,716
Rewards Points: 1,000

Re: Pitched To Flat Transition


Can't tell from that pic, but mine has the granules, so no talc, I guess. I'll start my shingles up two courses over a layer of I&W. Rich.
__________________
From where does knowledge come? If you need to know what is in a box, you could ask someone (not reliable), you could pray, (not useful), you can consult with the scripture (not helpful) or you could open the box (science)
reveivl is offline  
Old 05-31-2006, 10:42 AM   #17
Registered User
 
Grumpy's Avatar
 
Trade: Roofing and Gutter Specialist
Join Date: Oct 2003
Location: Chicago
Posts: 8,573
Rewards Points: 2,000

Re: Pitched To Flat Transition


Some manufacturers have details for this at their websites you may also want to check out the manual at www.nrca.net
__________________
-Grumpy
Chicago Gutters Chicago Roofing
Grumpy is offline  
Old 05-31-2006, 03:02 PM   #18
Commercial Roofing
 
AaronB.'s Avatar
 
Trade: Roofing Contractor
Join Date: Oct 2004
Location: Illinois IL
Posts: 1,220
Rewards Points: 500

Re: Pitched To Flat Transition


You can click on that photo to enlarge.

Advertisement

__________________
http://www.roseroofing.net/
Seamless Industrial and Commercial Roofing Systems, Residential Repair. For Those That Demand Quality!
Free roof inspections within 12 miles of our locale.
AaronB. 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
flat vs. eggshell Traditions Painting & Finish Work 40 04-13-2007 09:14 PM
What was wrong with flat extension cords?? K2 Health & Safety 13 03-19-2007 11:19 AM
Transitioning from a cove ceiling to a flat ceiling? Dustball Drywall 3 12-23-2006 11:11 AM
Flat roof over garage leaking under exterior walk out door IHI Roofing 18 05-30-2006 09:28 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?