From inside
Mortar or flashing can deteriorate with age and be in need of repair or replacement. It is
useful to inspect the ceiling after a long period of rain, as the source of a leak is easier
to trace. If stains are found, try tracing the source of the stain as it is not always
directly overhead.
Check inside the roof space for signs of dampness. Water can penetrate
the roof surface and travel between the roof and ceiling level before finding its way
through the ceiling.
Water staining on the ceiling or on the chimney breast walls will
indicate dampness getting through. Dampness here indicates problems with the flashings
causing the water to penetrate and run down the walls. If there is water staining inside a
room near a fireplace lower down the walls, then the problem could be due to the flue and
the fireplace being completely sealed.
Dampness inside the home can sometimes indicate
problems associated with the chimney stacks.
Outside at ground level
Outside, check the roof by inspecting at ground level. If chimney pots are broken, cracked
or missing they are easy to spot. Only the edges of the flaunching can be seen, but check
for deterioration or cracks in the mortar holding the pots in position.
Use binoculars to
scan the surface around the stack as carefully as possible, from all angles - front, back
and sides where applicable. Look for mortar missing from between bricks on the stack itself.
Check that the stack is still in a vertical position and not leaning. Look out for bulges
in masonry or blown rendering or pebbledash.
At the roof level
If you are using a ladder, always make sure it is set up correctly and long enough - at
least 3 rungs above the gutter. Always work with someone standing near by when you are
working at a height. See our Ladder Users Guide for
details on how to use a ladder correctly and safely.
Once at the roof level, only access the surface of the roof using a roof ladder. This is a
purpose built ladder that has wheels to allow you to push it up the sloping roof without
dislodging or damaging the slates. When the wheels reach the top of the roof ridge, by
turning the ladder over a hook securely lodges on the ridge. Roof ladders can be hired, see Hire Shops.
Otherwise, there are wheel and hook sections available to buy which fit onto conventional
ladders. If you are going to be working on the house, perhaps a scaffold tower would be
worth hiring, see Hire Shops.
The chimney stacks could be too high to work on from a roof ladder and there is chimney
scaffolding available which is specially designed for this type of work. This type of
scaffolding is also useful for more difficult jobs like removing and replacing pots on tall
chimneys.
