Materials

What goes on top, and what it actually costs you over forty years

The covering is the part of a roof people choose and the part least likely to fail first. It still matters — for weight, for lifespan, for how the building looks and for whether solar can be attached without piercing the waterproofing. Here is each option with its trade-offs stated rather than hidden.

Roofing materials compared
Material	Service life	Weight	Price band	Best for
Clay tile	50+ years	40–60 kg/m²	€€–€€€	Traditional pitched roofs, heritage and landscape-constrained buildings, and anywhere the roofscape is part of the architecture.
Concrete tile	40–60 years	45–65 kg/m²	€€	Large suburban roofs where cost per square metre matters and the profile choice is open.
Standing-seam metal	50+ years	5–8 kg/m²	€€€	Low pitches, complex geometry, alpine exposure, and structures that cannot take a heavy covering.
Bitumen shingle	25–35 years	10–14 kg/m²	€	Outbuildings, dormers, curved and irregular roof forms, and budget-constrained replacements.
Bituminous membrane	20–30 years	8–12 kg/m²	€€	Flat and low-pitch roofs, especially where a robust multi-layer build-up is wanted.
Synthetic single-ply membrane	25–35 years	2–4 kg/m²	€€	Large flat roofs, warm-roof build-ups, terraces and green roof constructions.

Service life: 50+ years
Weight: 40–60 kg/m²
Price band: €€–€€€

Clay tile

Clay remains the reference covering across all three of our markets and the default where a building has any architectural sensitivity. Its real advantage is not the tile but the maturity of the system around it: the accessories, the ventilation components, the fixing specifications and — increasingly — purpose-made PV mounting interfaces that let an array go on without breaking a tile. Where a roof is going to be looked at as well as rained on, this is usually the answer.

Strengths

The longest realistic service life of any mainstream covering
Colour is fired through the body, so it does not fade to a different roof
Manufactured locally in Slovenia and across the region — no import lead-time risk
Guarantees of up to 33 years marketed on qualifying ceramic products
Frost and UV resistant, and available in bora-rated fixing specifications
The only credible answer where coppi or a matching traditional profile is required

Trade-offs

Heavy — a change from a lightweight covering needs a structural check
Individual tiles are brittle under foot traffic and impact
Higher material cost than concrete for a visually similar result
Complex geometry needs many cut tiles and more labour

Service life: 40–60 years
Weight: 45–65 kg/m²
Price band: €€

Concrete tile

Concrete tile is the workhorse of the pitched roof market and, on a large straightforward roof, the most rational use of a budget. The system ranges behind it are excellent — insulation, ventilation, snow retention and PV integration all designed to work together and covered by a single system guarantee. Where the roof is not architecturally sensitive and the area is large, the money saved against clay is often better spent on the insulation layer underneath.

Strengths

Noticeably cheaper than clay for a comparable profile
Very complete system ranges, including full PV-compatible offerings
30-year system guarantees available on qualifying build-ups
Consistent dimensions make laying faster and cheaper
Strong performance under snow load with the right fixing

Trade-offs

Surface colour weathers and lightens over the first decade
As heavy as clay, so the structural check still applies
Less accepted in heritage and landscape-constrained contexts

Service life: 50+ years
Weight: 5–8 kg/m²
Price band: €€€

Standing-seam metal

Metal is where the sheet-metal trade and the roofing trade converge, and it rewards good detailing more than any other covering. Its structural lightness solves problems nothing else can — an old frame that will not carry tile, a pitch too shallow for discrete units, a geometry full of hips and valleys. For solar it is quietly the best substrate available, because a seam clamp attaches an array to the roof without ever piercing the waterproofing.

Strengths

A fraction of the weight of tile — often the only option on a marginal structure
Works at pitches where discrete tiles simply cannot be used
Continuous seams mean far fewer places for wind-driven rain to enter
Excellent under storm and high wind exposure
Aluminium products carry guarantees up to 40 years and are fully recyclable
Seam clamps let PV mount without a single penetration through the covering

Trade-offs

Highest material and labour cost of the pitched options
Sheds snow readily — snow retention is effectively mandatory in alpine locations
Needs a proper acoustic and thermal build-up beneath it, not just a deck
Requires genuinely skilled sheet-metal labour, which is scarce

Service life: 25–35 years
Weight: 10–14 kg/m²
Price band: €

Bitumen shingle

Shingle earns its place on secondary buildings, on shapes that defeat rigid coverings, and where a structure genuinely cannot carry more weight. What it does not do is match the working life of tile or metal, so specifying it on a main roof is a decision to replace that roof again in a generation. Where it is the right answer, the substrate and ventilation beneath it matter more than the shingle itself.

Strengths

Lowest installed cost of the pitched coverings
Light enough to go onto almost any existing structure
Handles curves and complex forms that rigid units cannot
Fast to install, which shortens the exposure window

Trade-offs

Shortest service life of the options here by a clear margin
Surface granules degrade under sustained UV exposure
Less resilient to hail than tile or metal
Rarely acceptable in heritage or landscape-constrained settings

Service life: 20–30 years
Weight: 8–12 kg/m²
Price band: €€

Bituminous membrane

The traditional flat roof answer, and still a very good one when the build-up is properly designed. Its redundancy is a real advantage: a defect in one layer does not immediately become water in the building. As with every flat roof, the outcome is decided at the upstands and outlets rather than in the middle of the field, which is where we spend the detailing budget.

Strengths

Multi-layer systems give genuine redundancy against a single point failure
Very well understood detailing at upstands, outlets and penetrations
Tolerant of foot traffic during maintenance
Mineral-finished top layers handle UV well

Trade-offs

Torch-applied systems carry fire risk and need proper controls
Heavier and thicker than single-ply alternatives
Laps and detailing are labour-intensive and skill-dependent

Service life: 25–35 years
Weight: 2–4 kg/m²
Price band: €€

Synthetic single-ply membrane

Single-ply is the modern flat roof default and, correctly welded, an excellent system. Because there is no second layer to catch a defect, we test rather than assume: electronic leak detection before finishes go down is available on any project and is standard on terraces and green roofs, where finding a puncture afterwards means lifting everything above it.

Strengths

Very light, which matters on a deck with little spare capacity
Fast to install over large areas with few seams
Hot-air welded seams with no open flame on site
Root-resistant grades available for green roof build-ups
Reflective finishes available for hot-climate roofs

Trade-offs

Single layer means no redundancy — a puncture is a leak
Welding quality is everything and is entirely installer-dependent
More vulnerable to mechanical damage from traffic and dropped tools

Start with the survey. Decide after you have read it.

A fixed-fee survey, a written condition report with annotated photographs, a realistic remaining service life and a costed action list. Credited in full against your project if you go ahead — and still useful if you do not.

Book a roof survey Or see the packages first

Water coming in right now? Mark the enquiry urgent or write to hello@roofpruf.com, and stay off the roof — do what is safe from inside while we read it.