What to expect
| Typical duration | Terrace roof 2–4 weeks · vault repair 1–3 weeks |
|---|---|
| Cost band | Figures live in the cost index |
| Permit required | Structural work yes · external appearance controlled in settlements |
| Seasonal constraint | Not during winter storm windows |
The three roof types you actually find
- The flat terrace
- The dominant type. It is a roof and a floor at once, which means it takes foot traffic, furniture, sometimes a hot tub, and full sun. Everything about the build-up follows from that. See waterproofing.
- The vault (καμάρα)
- On traditional and cave buildings, a curved roof that is also the structure. Repair is masonry work, not roofing work, and it is coordinated with an engineer where the geometry is doing structural work.
- The modern concrete slab
- On later additions. Straightforward in principle, and the usual problems are the same as the terrace: falls, outlets and the junction where it meets the original building.
Wind, which is the part people underestimate
Exposed elevations on this island — the south coast around Vlychada, the high ground at Pyrgos, the caldera rim — get sustained wind that would be considered notable elsewhere and is simply normal here.
For roofing that means uplift governs the fixing specification. Anything laid on a roof — insulation, ballast, pavers, solar panels, a pergola, a light fitting — is either mechanically fixed for uplift or it is a projectile in the making. Loose-laid systems chosen from a mainland catalogue are a recurring source of winter callouts.
The roof feeds the cistern
On any property with a working στέρνα, the roof and terrace are the catchment. That has consequences for the roof specification that owners rarely consider.
- The surface finish is in contact with water that will be stored and possibly used. Materials get chosen with that in mind.
- A first-flush arrangement diverts the initial runoff, which carries the accumulated dust — and Santorini generates a great deal of fine dust.
- Gutters, downpipes and inlets need to be accessible and cleanable, because they will silt up.
- Any roof works has to keep debris out of the cistern during the work, which is not automatic.
What this trade covers
- New flat terrace roof build-ups including structure, falls, waterproofing and finish.
- Vault repair and reconstruction on traditional buildings.
- Roof-level insulation, which on this island is a summer cooling measure more than a winter heating one.
- Rainwater collection: gutters, downpipes, first-flush arrangements and cistern inlets.
- Roof access, safety provision and edge protection where a terrace is in regular use.
- Wind-rated mounting for solar equipment, coordinated with the electrical work.
- Leak investigation and remedial work.
Questions people actually ask
Can I use my roof as a terrace?
Structurally it depends on what it was built to carry, and that is an engineer's question — foot traffic, furniture and especially a hot tub are very different loads. The waterproofing build-up also changes when a roof becomes trafficked.
Do I need insulation in the roof?
Usually yes, and mostly for summer. The roof is the largest solar gain surface on the building, and insulating it does more for comfort here than insulating walls. See insulation.
My vault is cracked. Who do I call?
A structural engineer first, because in a vault the shape is doing the work and a crack may be telling you the geometry has changed. See cave house renovation and structural cracks.
Can you fit solar panels on a flat roof?
Yes, with mounting designed for local wind loading and fixed into structure. Ballast-only mounting is not appropriate on exposed elevations here.
Why does water pond on my terrace after rain?
Insufficient or reversed falls, or a blocked outlet. Ponding is not just cosmetic — standing water is a load, it accelerates surface breakdown, and it will find any weakness in the detailing.