Corners are the places where leaks will most likely form.
Rain gutter corner leaking.
One reason is because all corners must consist of at least two pieces of guttering that are affixed together.
Ask your third guy to use butyl sealant or a tar based asphalt sealant and spread it at least 1 past the corner on each side.
You can check yourself.
The purpose of all rain gutters is to move water away from the base of your house.
If you notice that there is still water leaking add putty on the area of the gutter leak.
When they fail to do.
Second story gutter corner leaks might not be easy to spot from the ground.
Repair leaking joints with silicone caulk.
You re wise to address leaking gutters before disrepair causes costly damage to your home.
If water is leaking where the gutter and downspout jointly connect repair the joint connection.
Why gutter corners are troublesome.
You first need to clean your gutters thoroughly.
Remove the old silicone caulk from the joint connection.
Cut the caulk with a utility knife.
And the seam where they meet is a natural weak point in the system.
Leaking at the corners may be a sign of standing or accumulating water.
If you have a little standing water try to dam it up away from the corner using a sponge or an old rag.
You need to remove the old caulking.
The bond will not be permanent and the leak will eventually return.
Also have him check to see if the eavestrough has sufficient slope to allow water to flow quickly toward the downspouts.
To make sure that you have completely repaired your gutter pour water down your gutter then check if there is water leaking from the crack.