Special maintenance is related to preventative maintenance in that is focusses on vulnerable areas.
High-risk areas such as those around flues, near fumes from exhaust fans, under television arials or overhanging trees, or sites prone to mould, lichen, and bird droppings or debris may deteriorate faster than surrounding areas. Proximity to a motorway can cause the collection of contaminants and fine dust, as can nearby earthworks. Shavings from wood processing plants are often blown into crevices under flashings; the shavings retain moisture and can create poultice corrosion. Such areas may require more frequent maintenance than adjacent areas.
Details that trap debris against the roof, such as loose cables or gutter leaf guards, can be removed to allow free draining of these areas. Soil or lush vegetation at the base of wall cladding can also be removed to prolong the life of the cladding material.