A traditional, professionally installed thatched roof is typically constructed to a finished thickness of about 30 to 35 centimeters (roughly 12 to 14 inches). This substantial depth is necessary to ensure that the outer layers can weather seasonal rain, snow, and sun exposure while the inner core remains completely dry and impermeable. The thick mass provides both the structural weatherproofing shield and the high thermal insulation performance characteristic of classic thatched architecture.
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