Sheet-metal roofing products
A sheet-metal roofing product is almost always a piece of thin sheet folded into a precise profile. Its job is to carry water away where it would otherwise get in – where the roof meets a wall, around a chimney, along the top of a parapet, under a window. This sheet maps out the whole range.
- Sheet
- Sheet-metal products
- Revision
- Sources
- 8 items
- Type
- information guide
What sheet-metal roofing products are
A sheet-metal roofer – in Slovak a klampiar (older texts also say tinár or plechár) – makes and fits components from thin sheet, usually 0.5 to 0.8 mm thick. On a building they do three jobs:
- carry water away – gutters, downpipes, hoppers, eaves flashings, valleys,
- cover junctions and edges – chimney and wall flashings, verge flashings, parapet copings, window sills,
- seal and complete – counter-flashings, foam fillers under trapezoidal sheeting, butyl tape in joints.
The working principle is the same for all of them: the sheet that is higher up in the direction of flow must lap over the sheet that is lower down. Wherever this rule is broken, water gets in, however much sealant is used.
The range at a glance
| Group | Typical items | Where used | Details |
|---|---|---|---|
| Window sills | pressed sill, extruded aluminium sill, end caps | windows, shop fronts, plinth set-backs | Window sills |
| Roof flashings | underlay drip flashing, eaves flashing, ridge cap, hip cap | edges and ridges of a pitched roof | Roof flashings |
| Abutment flashings | chimney, wall, gable and penetration flashings; counter-flashing | where the covering meets a vertical structure | Flashing trims |
| Valleys | plain, ribbed, standing seam | internal angle between two roof slopes | Valleys |
| Verge flashings | over-covering trim, under-covering trim | gable edge | Verge flashings |
| Parapet copings | parapet capping, corners, expansion joints | flat roofs, upstand walls, terraces | Parapet coping |
| Rainwater system | gutter, bracket, stop end, angle, hopper, bend, downpipe, pipe clip | roof eaves | Gutters |
| Facade and plinth trims | plinth drip, opening flashings, external and internal corners | industrial buildings, sandwich-panel and trapezoidal cladding | Flashing trims |
| Sealing | PE foam fillers, butyl tapes | trapezoidal sheeting, sandwich panels, joints | PE foam fillers, Butyl tapes |
| Made-to-measure items | any folded profile to a drawing | non-standard details, renovations | Made-to-measure flashings |
What they are made of
Six common materials: galvanised steel, pre-painted (coated) galvanised steel – known locally as lakoplast – aluminium, titanium-zinc, copper and stainless steel. We discuss their properties, prices and compatibility on the Materials page. As a guide to thicknesses:
| Material | Usual thickness for sheet-metal items | Note |
|---|---|---|
| Galvanised and pre-painted steel | 0.5–0.6 mm | KJG gutters 0.55 mm; Ruukki SIBA 0.6 mm |
| Titanium-zinc | 0.65 / 0.70 / 0.80 mm | made to STN EN 988 |
| Copper | 0.55 mm (gutters) | building sheet to EN 1172 |
| Pre-painted aluminium | 0.70 mm (gutters) | pressed sills thinner, extruded sills thicker |
| Stainless steel | 0.50 mm (gutters) | AISI 304 |
The gutter thicknesses are from the technical data of the manufacturer KJG; the rest are from the documents listed in the technical sources below.
How they are made and in what lengths
Straight items are folded from sheets or coil on a folding machine. For folded trims, what matters is the girth (rozvinutá šírka, rš) and the number of folds; length is limited by the folder and by transport. Standard trims commonly come in 2 m and 3 m lengths; gutters and downpipes are supplied in lengths of 1 to 6 m.
Longer runs are joined with a lap. Roofing manufacturers’ installation guides give a 100 mm lap for eaves flashings and 150 to 200 mm for valleys, because a valley carries much more water.
- Drawing no.
- KV-09
- Title
- Half-round gutter, profile and girth
- Scale
- diagram, dimensions in mm
- Revision
- 14 October 2026
What the original site’s products were for
The original website on this domain offered window sills, flashing trims, general flashings, polyethylene sealing profiles and butyl tapes made from pre-painted galvanised sheet 0.5–0.6 mm thick, in standard 2 m and 3 m lengths, for cladding buildings and industrial halls. We have kept these topics and written them up on separate sheets:
- Flashing trimscorners, plinth drips, opening flashings, roof-to-wall junctions
- PE foam fillersfilling the ribs of trapezoidal sheeting under trims
- Butyl tapessealing sheet joints, vapour control layers and flashings
- Made-to-measure flashingshow to draw an item so that it fits
- Products and indicative priceswhat affects the price, and current sourced prices
Questions and answers
- What is the difference between a sheet-metal product and a roof covering?
- The covering protects the surface of the roof. Sheet-metal products deal with the edges, junctions and penetrations – eaves, verge, valley, chimney, wall, parapet – and with draining water off the roof. Without them a roof covering is not watertight.
- Can flashings be bought ready-made, or are they always made to measure?
- Both. Gutters, downpipes, brackets, bends and common trims are mass-produced in standard sizes. Parapet copings, wall flashings, valleys for unusual roofs and sills of non-standard depth are folded to site measurements.
- What does “rš” mean on a Slovak quote or catalogue?
- Rozvinutá šírka – the developed width, or girth, of the item, i.e. the width of the strip of sheet before it is folded. Material use, and often the price per linear metre, are calculated from it.
Technical sources
The sources this sheet draws on. We checked prices and values from standards on the date shown; for prices, whatever the source currently states always applies. Sources marked “in Slovak” or “in Czech” are only available in that language.
- Prepared by
- KlampiarskeVýrobky.sk
- Revision
- Spotted an error?
- email us · corrections policy