Does “J channel” used with vinyl siding applications act as window, door or ledger flashing or should flashing be present with J channel?
I have seen flashing with J channel but with most construction J channel is only visible, I have read vinyl siding acts as a counter flashing which relies on a moisture resistive barrier. Blue Skin brand flexible flashing is also avaliable which would not be seen with a visual inspection.
What is the best approach with a written narrative with this subject? Can you suggest a video associated with vinyl siding inspections?
Yes, flashing should be present.
Here is a tutorial using a window with an integral J channel:
J-channel is not a flashing, rather just a way to hold vinyl siding in place. Behind it you should see WRB/tape flashing and in rare cases metal flashing. Look up window/door installation and how they should be flashed regardless of siding/cladding used.
Thanks Larry, you are and have been a great help with my endeavours, the link was very informative. Have a great weekend pal!
Thanks Simon, I appreciate your response!
If the window unit has a nailing flange no flashing is required.
Hello Scott, is the flange nailed directly to the substrate after WRB tape is used around the perimeter of the window opening, then house wrap applied ??
Simon reminded me that different sealing methods are used with different manufacturers and there specific procedures with installation should be followed.
What would your narrative be upon inspection of a nailing flange window, as it would not be visible how would you describe it in your report weather it be good or defective??
I think people on here are somewhat confused about what flashing means. A flanged window absolutely requires flashing. Now a drip cap is a different animal.
No confusing here I have installed thousands of windows
I know it’s impossible to teach an old dog any new tricks, especially after having installed millions of windows. However, ASTM E2112 says you have much to learn. Perhaps, instead of pumping your chest, you may consider furthering your education
Ok big boy, I will get right on it.
Hello Scott and Simon, I apologize if I have upset you guys with this question and have found many different answers to it, one video suggestion was to seal the j channel to the window framing components with sealant.
The inspection videos I have watched regardless of the type of siding used are focused on penatrations and points of possible water intrusion or exposed substrate.
Maybe @bgromicko1 can get involved to arbitrate a correct answer so we can remain true to our code of ethics and leave personalities out of the conversation.
James, you did not upset me in the slightest. I gave you a correct answer. Did you pull up a few window manufacturer installation instructions (of flanged/new construction windows) as suggested? Vinyl siding is not waterproof, it is water resistant. What that means is that you cannot rely on any type of vinyl accessory, such as a J-channel to waterproof a penetration, such as a window – WRB and flashing is what makes the building envelope waterproof. If a flanged window is only caulked and not flashed, it’s often only a matter of time before it leaks if rain can get to it.
Thanks Simon, I have looked into some different window manufacturers as you suggested and understand flashing, sealant, and the weather resistance envelope. The Building Science, Green Building and moisture intursion courses have allowed for this knowledge. I am guessing that many installions are done incorrectly, with my limited experience, I want to ensure I preform a inspection to the best of my ability with accurate information.
Thanks for your help.
Hello Burt, awesome link, I even subscribed to it, thanks for sharing it with me,!