UPVC roofing sheet sizes at HESU currently include two clearly different profile systems. The solid T1130 sheet provides 1130 mm (44.49 in) of effective coverage with listed thicknesses from 1.5 A 3.0 mm. The hollow T940 panel provides 940 mm (37.01 in) of effective coverage with listed overall thicknesses from 6 A 12 mm. Both are produced in customized lengths.
| HESU profile | Struttura | Effective coverage | Listed thickness | Length |
|---|---|---|---|---|
| T1130 corrugated UPVC sheet | Solid profiled wall | 1130 mm / 44.49 in / 3.71 ft | 1.5-3.0 mm / 0.059-0.118 in | Customized |
| T940 hollow UPVC sheet | Upper and lower skins with internal webs | 940 mm / 37.01 in / 3.08 ft | 6-12 mm / 0.236-0.472 in overall depth | Customized |
The effective coverage figures are the useful widths for roof-area and sheet-count calculations. Larghezza totale del foglio, lap geometry, cut length, dimensional tolerances and profile details remain controlled by the current product drawing.
Which measurements define UPVC roofing sheet size?
A profiled roofing sheet needs more than length, width and thickness. Its useful size is a coordinated set of dimensions:
- Larghezza totale: the full edge-to-edge width before installation.
- Effective coverage: the net roof width left after the designed side lap.
- Length: the cut dimension running down the roof slope.
- Thickness or panel depth: either a solid-wall measurement or the overall depth of a hollow construction.
- Profile pitch and height: the spacing and depth of repeated crests, ribs or waves.
- Lap-edge geometry: the side shapes that nest adjacent sheets and establish the coverage module.
These dimensions work together. A width copied from another profile does not preserve drainage channels, fixing positions or lap fit. The current BS 5427 profiled-sheet scope also treats plastics as part of a cladding assembly involving profile, fissaggio, loading and dimensional change rather than as a width alone.
Why is effective coverage smaller than total width?
Adjacent profiled sheets overlap at their side edges. The overlapped strip belongs to both physical sheets, but it covers the roof only once. Effective coverage removes that duplicated width.
Effective coverage = total sheet width – designed side-lap width
For this reason, total width is useful for manufacturing, packing and handling, while effective coverage is the correct width for roof layout. Using total width in a quantity calculation produces too few sheets.
Consider one rectangular roof plane measuring 11.2 m across the direction of the sheet rows:
| Profile | Calculation | Sheets across the roof plane |
|---|---|---|
| T1130 | 11.2 / 1.13 = 9.91 | 10 sheets |
| T940 | 11.2 / 0.94 = 11.91 | 12 sheets |
Always round a partial sheet position up to the next whole sheet. Irregular edges, valli, fianchi, aperture, damaged pieces and planned spare material require separate allowances. HESU roofing sheet quantity and coverage calculation develops the complete roof-plane method.
Why are 1.5 mm solid and 6 mm hollow sheets not directly comparable?
The T1130 value describes the thickness of a continuous solid profiled wall. Increasing that wall from 1.5 mm toward 3.0 mm adds material throughout the profile when the other geometry stays the same.
The T940 value describes the overall depth between its outer surfaces. That depth contains an upper skin, una pelle inferiore, connecting webs and cavities. UN 10 mm hollow panel is therefore not 10 mm of solid UPVC. Skin thickness, spaziatura web, angolo della rete, cavity shape and profile height all contribute to the section.
Thickness still matters, but it must stay attached to the product structure. Within the same controlled solid profile, a thicker wall generally increases material mass and section stiffness. Across solid and hollow profiles, the nominal numbers describe different geometry and cannot rank strength, span, heat flow or price on their own.
How is the correct sheet length determined?
Sheet length follows the roof slope, not the horizontal building plan. For a simple single-slope roof, the base dimension is the measured distance along the supporting plane from the upper termination to the eave. Ridge details, eave projection, gutters, wall junctions and end-lap design then modify the final cut schedule.
A single full-slope sheet can remove an intermediate end lap. That does not make the longest possible sheet automatically correct. Long profiles require suitable lifting, level stack support, transport space and controlled movement as roof temperature changes. Container dimensions, access to the building and installation handling can set practical limits before the extrusion line does.
When a roof needs more than one row down the slope, the effective length of each row depends on the specified end lap. End lap is not a universal UPVC dimension. Roof slope, drainage path, exposure and the selected profile detail control it.
Which profile dimensions are often overlooked?
Width and length describe the sheet envelope, but the repeated profile controls how it behaves and connects. A complete drawing records crest or rib height, pitch, valley width, side-lap shape, edge direction and fixing zones. Hollow products also need a controlled cross-section showing skins, webs and cavities.
Accessories use the same dimensional language. Ridge pieces, side flashings and closures must match the profile pitch and height. A ridge cap described only by length may not seat on the crests or close the valleys. The accessory drawing should therefore reference the roofing profile it serves.
Dimensional tolerances also belong to the drawing and inspection record. Publishing a generic tolerance without the product method, measurement points and production specification would create false precision. HESU checks the current drawing and written specification for the profile being produced.
Does a wider or thicker sheet always perform better?
NO. A wider effective cover reduces the number of side laps across a fixed roof width, but performance still depends on profile geometry, supporta, elementi di fissaggio, slope and exposure. A wider sheet with unsuitable support or fixing details does not become a better roof.
Thickness has a clearer meaning within one product. More solid-wall thickness normally means more material, weight and stiffness. It can also change price and handling. However, allowable support spacing and load resistance need values tied to the selected profile, spessore, fastener arrangement and test or calculation condition.
Hollow depth works differently. Moving two skins apart with webs can change bending behavior without filling the complete section with solid material. The visible overall depth alone does not reveal skin thickness, web continuity or local resistance around a fastener.
How do dimensions affect price, packing and installation?
Solid-wall thickness changes material mass per metre. Effective width changes how much roof area that metre covers. Cut length changes the number of pieces, fine giri, stack support and available container layouts. Profile height affects nesting depth and bundle volume.
This creates a useful area basis:
Covered area per sheet = effective coverage width x installed sheet length
Price per effective m2 = sheet price / covered area per sheet
The same approach keeps size and cost connected. A low price per sheet is not automatically a low price per covered square metre when the sheet is narrower or shorter.
What should a complete UPVC sheet dimension record contain?
| Dimension field | Required record |
|---|---|
| Profile identity | Product name, profile code and solid or hollow structure |
| Larghezza | Total width and effective installed coverage |
| Length | Cut length and any end-lap arrangement |
| Sezione | Solid-wall thickness or hollow overall depth plus cross-section |
| Repeated geometry | Pece, crest or rib height, valleys and lap edges |
| Interfaces | Fixing zones, ridge pieces, flashings and closures |
| Control | Drawing revision, units, tolerances and measurement method |
This record prevents a familiar error: using one attractive width or thickness while leaving the profile unidentified. HESU can match the roof dimensions to the current T1130 or T940 drawing and confirm the available cut-length schedule.
UPVC roofing sheet size FAQ
What is the standard width of a UPVC roofing sheet?
HESU’s current effective widths are 1130 mm for the solid T1130 profile and 940 mm for the hollow T940 profile. Other manufacturers and profiles use different widths, so the profile code must accompany the number.
How wide is a 1130 mm roofing sheet in feet?
1130 mm equals approximately 3.71 ft or 44.49 in. This is the listed effective coverage of HESU T1130, not its total edge-to-edge width.
What thicknesses are available?
HESU lists 1.5-3.0 mm for the solid T1130 corrugated sheet and 6-12 mm overall thickness for the hollow T940 panel. The two ranges describe different cross-section structures.
Can UPVC roofing sheets be cut to length?
SÌ. HESU lists customized lengths. The final schedule must account for roof-slope distance, eave and ridge details, any end lap, handling and transport.
Which width should be used to calculate sheet quantity?
Use effective coverage width. It already removes the side-lap area counted twice by total sheet width.
Conclusione tecnica: HESU T1130 covers 1130 mm at 1.5-3.0 mm solid-wall thickness, while T940 covers 940 mm at 6-12 mm hollow-panel depth. Customized length completes the basic size, and the current profile drawing supplies the total width, lap geometry, tolerances and interfaces needed for production and installation.