Bathroom Exhaust Vent Through Roof ~ Arent Pic Decor

Bathroom Exhaust Vent Through Roof

I've just fitted a fan Xpelair CF20T that I have to vent through the roof. I cannot find any websites explaining how to do this. I understand that I cut through the roof felt and tiles but how do you seal a cowl to the roof so it doesn't leak? Any help appreciated.
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You will need to use some flashing around the base of the cowl.
If you click on the link below you might find what you want. http://www.klober.co.uk/product2.php?id=18
They really are the mutts nuts as they're unobtrusive.
One of these should solve your problem, they are available from all roofing merchants and good builders merchants
http://www.calderlead.co.uk/html/2614.html
Can you not vent thru the eaves, avoids cutting a hole in the roof?
Thanks for the responses. I need to get up on the roof and measure the tiles to select one of the tile vent products, it seems a good solution.
I cannot vent through the eaves as I have concrete gutters round the house and would have to put in a ducting of 4-5 metres to reach the eaves.

Nick
Again this is where Lapvent comes into its own - www.lapvent.co.uk - I have fitted loads and they do what they say on the tin (you may need a couple to assist flow though!).
nigel - thanks for questioning my logic, I phoned up Xpelair and the max length for ducting is 5m which allows me to reach the one place with an exit to the eaves! Saves a lot of work.