It sounds like you have an overflow situation.
Conservatory box gutter solution.
They will join your gutters securely.
If the box gutter has no overflow provisions this causes a waterfall over the sides of the box gutter typically running down the walls.
Ab conservatories ltd solution was to install one gallows bracket as shown on the right to support the box gutter.
I should add that the gallows bracket was constructed from wood and then covered in plasterboard.
Below is an excerpt from the ultraframe installation guide on how to install gallows brackets.
Box gutters create a sealed guttering between a conservatory and the adjoining house.
Conservatory box gutters are also designed to prevent damp spots and leaking.
60mm wide aluminium foil tape with butyl backing for box gutter joints and many more sealing applications.
They re made to catch and drain away the rainwater that falls between the walls and are usually always used for traditional pitched roof conservatories.
Injection moulded adapters are used to ensure seamless and watertight jointing between the classic upvc gutter and the aluminium box gutter.
The outlet of the box gutter may be blocked by debris or the box gutter outlet simply cannot discharge the water fast enough.
Next coat the inside of the gutter channel with a self etching metal primer.
To restore or repair your rusted box gutter liner you first need to clean the gutter and remove any debris.
For problem 1 above the solution is a fascia fixing kit.
This is the worst case scenario when it comes to box gutters.
Damage to the box gutter trim.
The butyl rubber backing can flex and has 60mm foil backed butyl tape 300mm 1m or 2m trusted solution for leaking box gutters 60mm wide aluminium foil tape with butyl backing for box.
Do note that with this option the rainwater from the roof of your property will now exit onto your conservatory roof.
Effectively your existing gutter is removed and the ridge of the conservatory roof is fixed against the fascia.
Each adapter comes complete with its own dry jointing gasket and measured shot of gutterbond proprietary sealant to ensure rapid completion even in the inclement weather typically found in the u k.
Drill holes into the overlapping edges of your gutter sections.
