October 3, 20188 yr Morning folks. For this week's DIY challenge I need to make my own flat roof. The roof bit is not too difficult. I have almost settled on a design. Its the box gutter that concerns me. The closest I can find for the design is this YT video. (0:08) See the black stuff that's between the layers of OSB - what is it? Ta!
October 3, 20188 yr I would have said it’s gutter seal or similar. Loads of movement and sticky as hell. Everbuild ROOF Roof And Gutter Sealant, Black, 310 ml https://www.amazon.co.uk/dp/B003OVCCU8/ref=cm_sw_r_cp_api_rUhTBbMVYM3YY
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