Mr Inspector, a fully qualified building inspector conducts building and pest inspections in the Black Rock area and surrounds and the photo above depicts valley gutter rust taken during a building inspection in Black Rock.
A building inspection of all the roof components is essential due to age of components over time. Valley gutters take rain water down to the gutters and then through the down pipes to storm water point of discharge. Over time the valley gutters can rust and the valley mortar can crack open and dislodge into the valley.
This can cause water to stagnate under the mortar debris and this rust can develop. Regular cleaning and inspecting of the roof components is recommended.