CareHomeDeskCareHomeDeskKeeping roof drainage clear and functional -- what to check, how often and what failure looks like.
Roof drainage should be cleared and inspected at least twice a year -- typically October and March. In a care home surrounded by mature trees, a third inspection in July may be appropriate to clear seed and debris build-up. Add roof drainage clearance to the quarterly grounds and maintenance schedule so it is never overlooked. A single blocked outlet in a heavy rain event can cause ponding that leads to membrane or structural failure within hours.
Flat roof drainage outlets must be checked for leaf and debris blockage at every inspection. Many flat roofs have domed covers over the outlet -- remove these and clear the basket beneath. Check the outlet flange seal to the membrane -- this is a common point of water ingress on older roofs. Install bird or leaf guards over all outlets to reduce the frequency of blockage. On flat roofs with multiple outlets, install an emergency overflow detail at parapet level -- if all primary drains block, the overflow will discharge water at the wall rather than allowing it to accumulate to depth on the roof.
Clear all gutters of debris and flush through with water to confirm flow to downpipes. Check gutter falls using a spirit level -- a minimum fall of 1:600 is required toward the outlet. Blocked or incorrectly-falling gutters allow standing water which promotes algae growth, accelerates corrosion in metal gutters, and can freeze and expand in winter. Check all downpipes for blockage by running water from the gutter and confirming discharge at the base. A blocked downpipe during heavy rain will cause the gutter to overflow -- often against the building fabric.
Soakaways have a limited service life -- typically 10-20 years depending on soil conditions. They fail when the surrounding soil becomes compacted or saturated. If you notice gutters overflowing when downpipes are clear, or if you see water emerging at the base of downpipes during heavy rain, suspect a soakaway failure. The solution may be a replacement soakaway (sized to current Building Regulations), connection to a main drain, or a rainwater harvesting tank. Do not attempt to inject chemicals into a failed soakaway -- this rarely works and delays proper resolution.
CareHomeDesk gives you compliance checklists, maintenance logs, and contractor management tools built around exactly this kind of knowledge.