Theoretical Analysis and Comparison of the Thermal Performance, Construction Costs, and Maintenance Complexity between a Conventional and an Intensive Green Roof

Table 8

Maintenance plan for the conventional flat roof layers and their service life prediction (SLP) (the table is structured by authors upon data from [20] and authors own assessment).

Layer	SLP (years)	Maintenance action			Frequency
		Visual	Monitoring	Preventive
Ceramic tiles	30–40
Check of state of cleanliness (dirt, debris)		x			2/year
Check for any cracks or any other damage		x			2/year
Replacement or major repair				x	After 40 years
Filter layer, geotextile	30–40
In exposed areas, check for any damage		x
Replacement or major repair				x	After 40 years
Waterproofing	30–40
In exposed areas, check of detachments, loss of adherence, rips		x			2/year
In exposed areas, check of moisture or biological colonization		x			2/year
In situ campaigns to assess watertightness			x		Every 5 years
Local repairs				x	When necessary
Deep inspection, scheduling of the next one				x	After 10 years
Replacement or major repair				x	After 40 years
Thermal insulation	30–40
In situ campaigns to assess heat fluxes and temperature values			x		Every 5 years
Local repairs				x	When necessary
Deep inspection, scheduling of the next one				x	After 10 years
Replacement or major repair				x	After 35 years
Load bearing structure	40–60
Check of excessive deformation, cracks		x			1/year
Check of blistering, moisture stains, infiltrations		x			2/year
In situ campaigns to assess structural stability and serviceability			x		When necessary
Local repairs				x	When necessary
Deep inspection, scheduling of the next one. Eventual replacement or major repair				x	After 40 years
Replacement or major repair				x	After 60 years