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Roger answers Patrick’s question about his roof — why there’s no felt or breather membrane under his concrete tiles, and whether the “secret gutter” joint is watertight.
Roger explains:
Many roofs worldwide are built without membranes, and this often improves ventilation and reduces condensation risks.
Patrick’s secret gutter (bonding gutter) is correctly channelling water, but nails placed in the channel could cause problems.
Alternatives like the “wet bonding gutter” aren’t ideal with uneven tile heights.
Despite minor flaws, Patrick’s roof is watertight, well-ventilated, and unlikely to suffer severe issues.
👉 Key takeaway: Proper ventilation and workmanship are more critical than always relying on membranes.
