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I am about to re-surface my flat roof with cold lay bitumen with gravel/chippings set in. The gravel/chippings come in polythene bags and are usually a bit damp. Is it ok to use them like that or should they be dry

Hello, My flat roof is felt with small chippings on top and edgings of what I assume is lead (see image atached). The problem is that there is no restrictive edge and the chippings wash off into the gutter as they are loose laid. My query is the best way to repair. Is there a thickish bitumen or...