Moss and weeds grow in gutters where debris has built up into soil and water has nowhere to go. They block outlets, add weight and push joints apart. Clear them while they are small, deal with the roof moss that feeds the gutter, and keep the run draining.
Why it grows
Leaves, seeds and roof grit rot down into a thin soil. With a little standing water, seeds sprout, and moss arrives on the wind. Shaded and valley-side roofs are most prone.
Why it matters
Roots work into joints, the mass of wet material adds weight to brackets, and the growth blocks the outlet. A gutter full of plants soaks the wall below it.
Keeping it clear
- Clear growth while it is young and shallow.
- Treat moss on the roof, since it washes into the gutter.
- Keep overhanging branches trimmed back.
Roof work is best left to a roofer.
Common questions
Will moss damage my gutters?
Over time it holds moisture and weight against the fixings and blocks drainage.
Does roof moss affect gutters?
Yes. Moss on tiles breaks off and washes straight into the gutter below.