The outlet of the box gutter may be blocked by debris or the box gutter outlet simply cannot discharge the water fast enough.
Box gutter issues.
Leaks can occur anywhere along the box gutter but are more likely to be found in and around areas where water stands in gutter and near or in drain leading to downspout.
This is one of the most serious issues with gutters specifically for homeowners in cold climates.
With a gutter out over an eave if the gutter overflows it tends to pour out harmlessly over the ground.
Where there is a box gutter involved any water that overflows finds it way inside the building.
Box gutter can be repaired several different ways patch and cover with the holes with metal then line inside with rubber you can also make a new cap to go over the top too keep the look the wood.
Look for pin holes or rust holes in gutter pan and or cracked or separated solder joints in coper or sheet metal.
If your gutter is still basically sound the easiest way to stop the leak is by covering the damaged area with roof and gutter repair tape available at home centers and hardware stores.
Compounding this is that in far too many cases the gutters are undersized or equally as bad there are insufficient and or undersized downpipes.
When the water hits the gutter it freezes.
Soldering a box gutter is the most permanent and effective way to repair a leak or open seam.
Only those with experience should attempt to solder as it is dangerous and required specialized knowledge.
To ensure your gutters against leaks in the future you should solder all seams corners and joints.
When the water can t pass through properly it can start to cause problems with your foundation.
Gutters not draining or clogged gutters.
The most common problem we see with gutters is clogging.
Ice dams are the result of snow melting off your roof and collecting in the gutter system.
If the box gutter has no overflow provisions this causes a waterfall over the sides of the box gutter typically running down the walls.
This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg.
Prepare the gutter by scraping out as much old tar or caulk as possible.
The ice continues to compile and an ice dam is born.
All domestic box gutters must be a minimum of 200mm wide and 75mm deep.
When you keep avoiding the dreaded chore of cleaning out your rain gutters they will just fill up with debris making them unable to do their job routing the runoff after rainstorms from your roof so it drains away from the house so there is no water damage.