Why Flashing Corners are Important

Flashing Corners are an important part of window pan creation AND they help protect the rough openings from water intrusion.

When a heavy window is set into the rough opening, it always needs to be adjusted in place. It Never rests in the correct location immediately. To get the correct inside reveals, it will be moved to the right or left 1/2″ or so. The flashing corners provide protection from the Fish Mouth holes that will happen in the corners if Only Flexible SAF (Peel and stick) water proof membranes are used to create the lower pan for the window. The Rigid pre-formed flashing corners provide armor for these lower corners. See the photos below:

Fish Mouth Hole from a heavy window. This must be avoided!

Additionally, when stucco is being applied to the wall, the flashing corners create great protection from furring nails and lath staples. If expansion metal is used, the flashing corners are even more important because the expansion metal always terminates at the corners of the windows. See photos below for examples.

 

 

Fish Mouth Hole created due to the lack of a rigid corner.

The photos below show a stucco wall as it is prepared for the scratch coat of stucco. Notice the lath fasteners and the Expansion metal that terminates at the corners of the windows. The Expansion metal is nailed in place VERY close to our windows. This project used 4 Lightning Flash corners per window. The upper and lower corners were well protected from the penetrations by the installation of the lath wire and the expansion metal.

Lower Lightning Flash Corner in place during pan creation

Lower Pan Corner with End Dam applied over the Lightning Flash Corner

Upper Lightning Flash Corner in place. Notice the sealant squeeze-out to the inside.

Upper Lightning Flash Corner in place.

Window set on top of the membrane pan. The sealant is applied but not yet tooled into place. This is the correct amount of sealant.

Tooling the sealant into place. This is an important step to keep water out of the building.

The upper corner in place after the window is set.

This is how your pan should look after the sealant is correctly tooled into place.

Notice how the expansion metal is applied and fastened next to the window. The Lightning Flash Corners play an important part of protecting our rough opening from damage by the Lath screws and nails .

This is how the expansion metal terminates at the top of the windows. The Lightning Flash Flashing corners help protect the rough opening from these penetrations.

 

The expansion metal terminates at the top of the windows. The Lightning Flash Corners are an important part of protecting this rough opening from the penetrations by the lath and the expansion metal.

 

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