Does Anyone Know What Regiment These...
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No best answer has yet been selected by sarahbowen82. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.That's probably because gravel on felted roofs cannot improve dainage.
Rain falls on the roof runs to the gutter and goes down the down pipe.
Gravel is added normally to protect the surface from degradation due to sunlight
http://www.diynot.com/pages/rg/rg016.php
normally light coloured limestone chips or pea shingle something like that.
Your local DIY probably thought there was some new product he hadn't heard about - he's probably leafing through catalogs as we speak