Use a cold bitumen solution available from most decent DIY shops.
spread this over the roof with a broom. Give it 2 -3 coats and then use a silver solution ( ask at a decent hardware shop ) should last about 10 yrs. I agree a pitched roof will last longer since the water will roll off faster.
Gary
April 2006
Do you have space for a pitched roof?
If so, build on top of your existing roof and solve your problem for a long time to come.
Did you know flat roofs have a life expectancy of only 5 years?
Darren
April 2006
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