Sheet-metal roofing products and flashing for roofs and buildings
What a properly flashed chimney looks like, why a window sill has to project beyond the facade, and what a metre of gutter costs in galvanised steel, titanium-zinc or copper. We explain each sheet-metal component, material and installation detail, and every price comes with a date and a source. When you are ready, we help you put together an enquiry that a Slovak sheet-metal roofer (klampiar) will understand at first reading.
- chimney stack (masonry or a proprietary chimney system)
- roof covering
- roofing underlay, turned up and bonded to the chimney by at least 150 mm
- front apron flashing (zásterka) laid on the covering and turned up the chimney face
- back gutter flashing running under the covering, shedding water to the sides
- counter-flashing (movement) strip fixed into the chimney
- permanently elastic, UV-stable sealant in the top joint
- battens and counter-battens
- Drawing no.
- KV-01
- Title
- Chimney flashing, section along the fall
- Scale
- diagram, dimensions in mm
- Revision
- 14 October 2026
Sheet-metal products
Each component is shown in cross-section, just as the roofer folds it from sheet. For each one you will find what it does, what it is made of and where it most often fails.
Window sills
Exterior sills in aluminium and pre-painted galvanised steel, standard and made to measure.
projection beyond facade 30–40 mm
Chimney flashing
Front apron, back gutter, side flashings and counter-flashing. The most common source of leaks.
underlay up the chimney min. 150 mm
Parapet copings
Metal capping on the top of a parapet wall around a flat roof, falling towards the roof.
fall min. 3°
Valleys
The metal where two roof slopes meet and water concentrates.
exposed width 200–300 mm
Verge flashings
Finishing the roof at the gable against wind and driven rain.
fixed into the covering and verge board
Eaves flashings
The underlay drip flashing and eaves flashing that lead water into the gutter.
lap at joints 100 mm
Abutment flashings
Roof-to-wall junctions, gables, roof penetrations and other flashing trims.
counter-flashing + sealant
Rainwater systems
Gutters, brackets, hoppers, downpipes and bends. Sized from the roof area.
fall 1–5 mm/m, per manufacturer
Made-to-measure flashings
Folded profiles to your drawing: girth, angles, thickness, colour.
specified by a dimensioned drawing
The most common jobs
These are the jobs you are most likely to meet on family houses and blocks of flats. For each one: what it includes and what to keep an eye on.
| Job | What it includes | What to watch |
|---|---|---|
| New chimney flashing | removing the old flashing, connecting the underlay, front, side and back flashings, counter-flashing, sealant | the back of the chimney and the movement strip; sealant is no substitute for a proper metal lap |
| Replacing gutters and downpipes | removal, brackets, gutters laid to fall, hoppers, bends, downpipes, pipe clips, connection to the gully | size to suit the roof area, fall towards the outlet, expansion joints on long gutters |
| Exterior sills with external wall insulation | measuring after the insulation is on, manufacture, fitting under the frame, end caps | 30–40 mm projection beyond the finished facade, fall outwards, expansion gap at the end caps |
| Parapet coping | backing board, clips, coping laid to fall, joints that allow movement | fall towards the roof, drip nose projecting beyond the facade, waterproofing under the metal |
| Flashings with a new roof covering | underlay drip flashing, eaves flashing, valleys, verge flashings, wall and penetration flashings | the order of installation and laps that follow the flow of water |
| Repairing gutters and flashings | sealing joints, replacing a hopper or bend, correcting the fall, repainting | whether a repair still makes sense, or replacing the whole run is better value |
Materials
The gutter prices are for the same component in six materials from one Slovak manufacturer, so the comparison is fair. We give a service life only where the material manufacturer states one or it can be derived from a standard.
| Material | Typical gutter thickness | Gutter, girth 333, € per m excl. VAT | Service life / warranty per source | Watch out for |
|---|---|---|---|---|
| Galvanised steel | 0.55 mm | 4.20 | in an urban C3 environment the Z275 zinc coating (~20 µm per side) is used up in roughly 9–29 years (calculated from ISO 9223) | cut edges, run-off from copper |
| Pre-painted (coated) steel | 0.55–0.6 mm | 7.93 | 30-year warranty on the rainwater system (Ruukki, Lindab), subject to the warranty conditions | damaged paint, cutting with an angle grinder |
| Aluminium (pre-painted) | 0.70 mm | 8.70 | we have no verified service-life figure, so we do not give one | high thermal expansion, run-off from copper |
| Stainless steel | 0.50 mm | 12.02 | we have no verified service-life figure, so we do not give one | contact with aluminium |
| Titanium-zinc | 0.65–0.70 mm | 13.49 | VMZINC: gutters more than 50 years, roofs 100 years | copper above zinc, acidic run-off from bitumen membranes |
| Copper | 0.55 mm | 45.59 | Aurubis: reference service life of more than 100 years | water from copper must not run onto zinc, galvanised steel or aluminium |
Prices: KJG a.s. recommended retail prices, price list valid from 11 August 2026, checked 14 October 2026; half-round gutter, girth 333 (rš 333), in 3–4 m lengths. Service-life sources are listed on the Materials page.
Choosing the right solution
The most expensive material is not automatically the best. A flashing has to suit the roof covering, the other metals on the roof and how long you want to be left in peace.
If you cannot judge some of this yourself, say so in your enquiry. The roofer weighs up the same things you do.
- Durability
- Galvanised steel is protected only by a thin layer of zinc; paint extends its life. Titanium-zinc and copper form their own patina, and their service life is quoted in decades up to a century.
- Cost
- On the same gutter, copper costs roughly ten times as much as galvanised steel. Labour costs much the same for every material, but copper and titanium-zinc tend to take more work, for example because they are soldered.
- Location
- Urban, industrial and mountain environments speed up zinc corrosion. Ruukki halves its warranty periods for installations more than 900 m above sea level.
- Roof type
- Metal roofing, clay tiles and flat roofs each have their own details. The metal used for flashings should match the roof covering or be galvanically compatible with it.
- Maintenance
- Cleaning the gutters, checking the sealant at the chimney and repairing damaged paint will extend the life of the flashing more than a dearer material left unmaintained.
Prices
There are no fixed prices for sheet-metal roofing work. We give ranges from publicly available Slovak price lists and portals, always with a date and whether VAT is included.
What does chimney flashing cost?
€126–469 excl. VAT for a chimney flashing kit (materials)
PorTec price list valid from 1 July 2026; depends on material and chimney size
Cost of exterior window sills
€10–28 per m excl. VAT for labour
Numiq, updated 14 May 2026; materials not included
Sheet-metal roofing work per metre
€6–45 per m excl. VAT depending on the job
Numiq, updated 14 May 2026; materials not included
Cost of parapet coping
€12–35 per m excl. VAT for labour
Numiq, 14 May 2026; item “parapet, ridge”
Cost of a rainwater system
gutter €4.20–45.59 per m excl. VAT depending on material
KJG, price list from 11 August 2026; installation €8–20 per m excl. VAT (Numiq, May 2026)
Put together an enquiry for a sheet-metal roofer
Choose the type of job and add details about the building. The page turns them into a clear text that you can copy or open in your own email app. Nothing is sent or stored on our side; you attach photos to your own email.
You can also send the enquiry straight to us at dopyt@klampiarskevyrobky.sk. We will reply with general guidance and, where we can, suggest what kind of firm to look for in your area. We can reply in English, but local firms may only speak Slovak. We do not install anything ourselves and have no partner network.