DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION the chimney covering shown in FIG.
1 comprises a flashing generally designated 1, which is applicable in the same plane as a sloping roof, a connecting piece 2, a jacket 3 and, mounted thereon, a top or cowl 4 for keeping the rain off.
As appears from FIGS.
2 and 3, the flashing 1 is composed of two separate metal sheets 5, 6, both having upwardly projecting metal portions 7', 7" which together form a collar 7 when the sheets 5, 6 have been placed adjacent each other with one sheet overlapping the other.
The collar 7 then defines a rectangular opening 8 in the flashing formed by the sheets 5, 6.
Since the sheets 5, 6 are displaceable relative to each other, the size of the opening 8 can be adjusted to different types of chimney pots before the sheets are finally secured to the roof structure, e.
g.
by bolts passing through the overlapping portions of the sheets.
As appears from FIGS.
4 and 5, the jacket 3 has an end 9 which is always facing upwards and at which all four walls of the jacket are cut at right angles to the longitudinal or centre axis of the jacket.
This upper end of the jacket can be provided with a guide plate 11 having a central circular opening 12 of the same diameter as the diameter of a chimney pipe rising from a roof and to be covered by the chimney covering.
The lower end 13 of the jacket, however, is obliquely cut, more specifically in such a manner that the lower edges 14, 14' of the two opposite side walls of the jacket extend at an angle of 45.
degree.
to the longitudinal axis of the jacket, whereas the lower edges 15, 15' of the front wall and the rear wall of the jacket, respectively, extend at right angles to said axis.
Similarly, a first end 16 of the connecting piece 2 extends at right angles to the longitudinal axis of the connecting piece whereas the opposite, second end 17 thereof is obliquely cut, more specifically at an angle which is smaller than the oblique cutting angle of the jacket 3.
In practice, it is preferred that the lower edges 18 of the side walls of the connecting piece are obliquely cut at an angle which is substantially half the oblique cutting angle of the jacket that is about 22
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Screen Walls 
