Tiles first, then the skirting, then a smear of clear sealant between. Then
you don't have to worry to much about a perfect edge finish on the tiles and
the sealant stops the moisture from attacking the skirting to much.
Remember, when you apply the sealant, to make nice straight edges with
masking tape on the tiles and skirting, then when it cures off a bit and you
peal the masking tape back, you don't have all that excess sealant all over
the bits you didn't want it on.
The tiles sit on top of the skirting so put that on first.
If the skirting is dead level and at a suitable height it can be used as the
Otherwise fit a batten less than one whole tile height above the skirting,
tile above this and fill bottom row afterwards.
See the howto tiling leaflets all the shed seem to have.
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