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  • I’d replace the rotten hardboard for a start then get some roofing adhesive and glue down a water proof membrane. Should stop the leak.

    I should point out I have no experience in this.

  • Flexacryl and some 'scrim' is good - the scrim provides a scaffold for the Flexacryl to bond to. The thin fleece material that you wrap plants to protect them from frost would work.

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