Trapezoidal profile roofing and covering sheets in Polimglass material

The Greca 143 roof sheeting product by Tecno Imac, made in polimglass® material with its characteristic trapezoidal profile with 143 mm pitch, is the ideal sheet solution for roofing industrial and agricultural buildings.

Greca 143 is a trapezoidal profile corrugated sheet with a pitch of 143 mm and a height of 37 mm, it may be ordered in the extremely attractive Tecno Imac glossy finishes. A range of accessories and specific fittings completes this product line, the ideal solution for roofing agricultural and industrial buildings with excellent technical and aesthetic results. Greca 143 is entirely manufactured in Italy in Polimglass® material.

Technical specifications

Standard length mm fino a 13.500
width mm 1.060
useful width mm 1.001
average thickness* mm 2,80
weight* kg/m2 6,00
thermal expansion coefficient °C-1 3,99×10-5
unitary thermal transmittance W/m2k 4,68
breakage load kg/m2 483

anticato colour


terracotta colour

The material

Greca 143 is a Polimglass® roofing sheet (learn more about it), a material made and patented by Tecno Imac obtained by the convergence of three different individually extruded thermoplastic layers at a terminal extrusion head. The result is a single sheet that is stratified in three different layers, each of which is optimised to perform certain functions:

1-top layer: solid-coloured in PMMA (Methacrylate) for colours and finishes that are perfect and highly resistant to UV, weather and environmental exposure to chemicals of any kind.


2-middle layer: a mixture of different polymers loaded with micronized inert material, for a low thermal expansion, good acoustic behaviour and resistance to bending.


3-bottom layer: thermoplastic compounds for maximum resistance to impact and chemical aggression from underneath.The result of this particular combination of thermoplastic materials is a stable and resistant synthetic product, applicable to any environmental situation, without fear of attacks of acid vapours of any kind, whether industrial or agricultural, or the most aggressive saline environments.

Assembly tips

Roof sheeting must be laid on a framework of purlins whose span interval is proportional to the prevailing loads and the inclination.
Position the first sheet with the stamped-marking side facing towards the outside of the roof. After it has been aligned, secure it with its first crest aligned to the roof superstructure.

Warning: allow for normal thermal expansion by drilling the sheet fixing holes a bit wider than the fastening screw shank diameter, typically a 10 mm hole diameter for 6.5 mm screws.

Then the second line of fastenings should be fixed to the next higher purlin.
Establish an overlap between the second and first rows and fix the line of screws through the overlap. To maintain alignment, we recommend using a reference lanyard anchored to the ends of the purlin.
Proceed in a similar manner with the subsequent sheets, up to the last. If necessary, the width of the last sheet can be adjusted by trimming it with an angle grinder. When this has been done, proceed to secure all the sheets following the indications illustrated in the figure (at least four screw-down fastenings on each sheet per purlin, on all crests on the lowermost eaves gutter purlin).


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ico_download_pdfManuale di montaggio*
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