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?
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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.