ᐅ Retrofit wall connection for porch roof on external thermal insulation composite system (ETICS)

We have a canopy where the aluminum profile for the wall connection is securely screwed onto the roof, but on the insulated exterior wall system (EIFS / external thermal insulation composite system), it is only glued (to avoid damaging the insulation). This joint keeps cracking open every few weeks, allowing rain to run down the wall.

What is the correct way to do this? I couldn’t find any information about it anywhere. Apparently, everyone already knew from the start where to place which canopies and installed the profile underneath the insulation. Of course, I don’t want to retroactively do that.

My idea is to seal the joint with sealing tape (don’t worry, it won’t be visible) and then apply another sealant bead on top to make it watertight. The sealing tape is flexible, so the joint won’t crack open anymore.

Could you please upload some photos?

Hello Changeling,

your external thermal insulation composite system (ETICS) is probably plastered. Achieving a tight seal with a smooth flashing on rough plaster is almost impossible. Sealing or swelling tapes only help to a limited extent because they tend to push your flashing away from the wall (since there are no screws into the ETICS).

How high is your rising wall above the roof canopy’s finished surface level?

The only option I can think of is to make the flashing in two parts or to cover your facade along the length of the canopy with a smooth metal sheet extending under the roof overhang at the verge/eaves. This way, all driving rain hits your metal sheets directly and does not enter the gap behind them.

Downside: it’s expensive and doesn’t look very good!