Hello.
Looking for a little flashing advice. We’re installing some click lock standing seam metal roofing as siding. We’ve got some metal j-channel for use around the doors and windows. I feel like I can flash the top of a window properly but I’m concerned for the bottom corners of a window where water could possibly run right down the sides of the window and behind the metal right at the corner. Any suggestions?
Discussion Forum
Discussion Forum
Up Next
Video Shorts
Featured Story
Listeners write in about ventilation and radon control and ask questions about tightening basement garages, ventilation solutions, and safer paint stripper.
Featured Video
Highlights
Fine Homebuilding Magazine
Fine Home Building
Follow
-
Fine Homebuilding
Dig into cutting-edge approaches and decades of proven solutions with total access to our experts and tradespeople.
Start Free Trial Now -
GBA Prime
Get instant access to the latest developments in green building, research, and reports from the field.
Start Free Trial Now
- Home Group
- Antique Trader
- Arts & Crafts Homes
- Bank Note Reporter
- Cabin Life
- Cuisine at Home
- Fine Gardening
- Fine Woodworking
- Green Building Advisor
- Garden Gate
- Horticulture
- Keep Craft Alive
- Log Home Living
- Military Trader/Vehicles
- Numismatic News
- Numismaster
- Old Cars Weekly
- Old House Journal
- Period Homes
- Popular Woodworking
- Script
- ShopNotes
- Sports Collectors Digest
- Threads
- Timber Home Living
- Traditional Building
- Woodsmith
- World Coin News
- Writer's Digest
Replies
Hey there, I would need more info to offer detailing advice, but in general, any siding like vinyl, metal, etc. that uses J-channel is not inherently weathertight. The whole assembly is meant to cover the sheathing and drain well. Thus, the sheathing needs a weather barrier/drainage plane integrated with the window and door flashing. This type of siding will keep most of the water out, but cannot be detailed to keep all of out if there are penetration (doors, windows, vents, etc.) .
Consider using self-adhesive flashing tape to seal the bottom corners of the windows. Apply it carefully to ensure a watertight seal and prevent any water from seeping behind the metal. Additionally, ensure proper flashing integration with the metal roofing to divert water away effectively. This should help address your concerns about water runoff at the corners of the windows.