Fixing Downpipe on roof tile?

I have to run 2 length (total length 3m) of downpipe across the roof of an extension. This to avoid water running onto the roof, which motive leakage due to substantial amount of rain river. Can anyone suggest how should I fix the downpipe onto the roof-tile without have to drill it (it would sound a daft idea). So how can I fix the downpipe onto the roof minus it being blown away by lofty wind. Much appreciated for any suggestions!


Answers:    i,ve done this
gain a metal coat hanger and cut it into 8" lengths, bend contained by the middle to form a vee shape.
get some big tie wraps and put them around the waste and clip the cut lengths to the pipe within a straight line.
push the bent pieces of telecommunication up into the tiles firmly and the tiles will hold it in place.
do this on a dry time and mastic it in for added financial guarantee
don,t worry more or less it rusting, it will be a lot of years earlier this will affect the metal
you want guttering
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