Flat roofs
Water Puddling or Standing On Flat Roof
Deterioration or leaking may occur if water stands on a roof too long. A little puddling is acceptable provided that it is not too deep.
Gravel Voids On Flat Roofs May Shorten the Life Expectancy or Cause Leaking
Gravel voids can cause a roof to leak, shorten it's life expectancy and deteriorate the tar or building paper.
Clogged Drains and Debris Build-up on Flat Roofs
Flat type roofs often have leaves and other debris that gathers on them overtime. If the leaves and debris are not occasionally removed, the drains may get clogged or restricted by the debris. If water builds-up, leaking may occur and if the water builds up high enough, it can cause structural damage.