Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-09-2007, 07:39 PM   #1
Newbie
 
Join Date: Sep 2007
Posts: 1
Rewards Points: 10
Default

Joining 2 different materials at a ridge?


Ok guys, I'm a young architect with limited experience, and i was wondering if I could get some sage advice. I have a client that is adding a full second floor to the rear portion of a cape cod house. The only problem is that to be code compliant, I really need to keep the slope over the new roof to 1:12, and the client is INSISTENT upon using standing seam metal. So... is it possible for an asphalt shingle roof with a 9:12 slope to join a 1:12 slope standing seam roof at the ridge? And any suggestions on how to ventilate? Normally I would run Propas from soffit to ridge vent, but i'm concerned about putting a ridge vent along such a low slope and then having rainwater blow back up into the attic through the vent. Even more unsettling... this guy's acting as his own GC.

Whadya guys think?

architrave0 is offline   Reply With Quote
Old 09-09-2007, 10:57 PM   #2
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

Joining 2 different materials at a ridge?


have him do the whole roof in standing seam,and keep the vent to the 9 on 12 pitch--

the roofing god is offline   Reply With Quote
Old 09-10-2007, 09:48 AM   #3
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

Joining 2 different materials at a ridge?


Several things to point out.

First;
You can have the sheet metal flashing fold over symetrically and equally onto the 9/12 portion of the roof. Also run similar looking flashing for the remainder of the ridge even where the dormer is not connected for an even continuos appearance.

Second;
You can install a ridge vent below specification level if you insert an j-channel on the interior portion of a ridge vent such as the Shingle Vent II. The longer leg of the metal flashing gets covered by the top edge of the last course of shingles, then their is a 3/4" to 1" perpindicular rise and then the shorter leg runs back at a 90* angle facing the eave edge. This creates an internal baffle in addition to the preexisting external baffle to battle the weather elements.

It is not listed in their application guidelines, but I have done this successfully on many occassions on cape cod roofs with rear low slope dormers.

Third;
If neither of these options are utilized, you can install the one sided ridge vent product manufactured by DCI Products as their One Sided Smart Vent application. This would get installed only along the ridge on the opposite side of the dormer, which would alleviate any of the potential concerns you may have.

Here is the link to the SmartRidge I from DCI Products:
http://www.dciproducts.com/html/smartridge%20I.htm

Ed

Last edited by Ed the Roofer; 09-10-2007 at 09:52 AM.
Ed the Roofer is offline   Reply With Quote
Old 09-10-2007, 08:44 PM   #4
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

Joining 2 different materials at a ridge?


thats all well and good but the point is the ss roof will last many years longer and if it goes over the shingles,you`re gonna have a lot of work when the shingles go bad,best to bite the bullet and do it all in ss now
the roofing god is offline   Reply With Quote
Old 09-10-2007, 08:49 PM   #5
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

Joining 2 different materials at a ridge?


His question was not about which roof system would be better for the entire home.

If it were, I would tend to agree with you.

But, it was about how to tie the two systems together at the ridge with additional concerns regarding ventilation and weather resistance.

Ed
Ed the Roofer is offline   Reply With Quote
Old 09-10-2007, 09:47 PM   #6
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

Joining 2 different materials at a ridge?


just trying to educate the architect on the thought process,my 1st answer covered it for his question but he should recommend the proper system and tell them why,and the fact that you have to do work again to the back of the metal system when he does the shingle area is important to consider .your answers were good ed,I was just elaborating on it and reasons to do it different-it is his reputation,you don`t want his client calling him on it in 5 yr.s if he left it unsaid,better he suggest it and have them turn it down ,then have them say later "why didn`t you tell me that??that`s why we relied on you!"
the roofing god is offline   Reply With Quote
Old 09-10-2007, 10:08 PM   #7
Member
 
Join Date: Jan 2007
Posts: 2,384
Rewards Points: 1,000
Default

Joining 2 different materials at a ridge?


Remember, he stated that the HO was GC'ing the project himself. I doubt if he will be springing for additional bucks if he is that way to begin with, and the guy make a comment as to shudder to the thought.

I agree with what you said though.

Ed
Ed the Roofer is offline   Reply With Quote
Old 09-10-2007, 11:31 PM   #8
Member
 
the roofing god's Avatar
 
Join Date: Aug 2007
Location: Pomona,New York,10970
Posts: 877
Rewards Points: 500
Send a message via MSN to the roofing god
Default

Joining 2 different materials at a ridge?


I always make it a point to tell `em anyway

the roofing god is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
How much should ridge cap cover the shingle Malcolm Roofing/Siding 4 01-09-2008 01:19 AM
Useless Ridge Vent? itwerx2 Roofing/Siding 22 10-22-2007 09:57 PM
Losing aggregate from asphalt shingle ridge bkspero Roofing/Siding 8 07-19-2007 09:40 PM
Ridge vent installation cost Douche Roofing/Siding 1 07-26-2006 04:59 AM
Ridge Vent - Low-pitched roof? brianp Roofing/Siding 2 05-08-2006 08:32 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.