U Purlin

Our pre-punched purlins are quick to install and suitable for both insulated and uninsulated roofs and walls. 

The thickness and height of the purlin selected depend on span length and loads. To optimise the design, use our PurCalc software.


  • Industrial construction
  • Hall and warehouse construction
  • Extension construction and renovation

The information on our website is accurate to the best of our knowledge and understanding. Although every effort has been made to ensure accuracy, the company cannot accept any responsibility for any direct or indirect damages resulting from possible errors or incorrect application of the information of this publication. We reserve the right to make changes.




Model name
U Purlin
100, 150, 200, 250, 300 mm
1.0, 1.2, 1.5, 2.0, 2.5, 3.0 mm
Section type
Minimum length
1600 mm
Maximum Length
15000 mm
Hot galvanised steel sheet Steel quality S350GD+Z275 according to EN 10346
Dimensions and shape according to EN 1090-4, material thickness according to EN 10143

Cross-section geometries


Type of purlin Thickness (mm) Height (mm) Width of flange
A (mm)
Weight (kg/m)
LP-U100, LP-U104 1,0 100/104 52 LP-U104: Flanges -4mm for all thicknesses 1,60
1,2 52 1,92
1,5 53 2,40
  2,0   52   3,12
  2,5   59   4,16
  3,0    51   4,56
LP-U150, LP-U154 1,0 150/154 52 LP-U154: Flanges -4mm for all thicknesses 2,00
1,2 52 2,40
1,5 53 3,00
2,0 54 4,00
  2,5   45   4,60
  3,0   48   5,64
LP-U200, LP-U204 1,0 200/204 49 LP-U204: Flanges -4mm for all thicknesses 2,35
1,2 49 2,82
1,5 50 3,52
2,0 51 4,70
  2,5   -   -
  3,0   49   6,86
LP-U250, LP-U254 1,0 250/254 52 LP-U254: Flanges -4mm for all thicknesses 2,80
  1,2   52   3,36
  1,5   53   4,20
2,0 54 5,60
2.5 64 7,40
3,0 55 8,35
LP-U300, LP-U304 1,0 300/304 62 LP-U304: Flanges -4mm for all thicknesses 3,36
  1,2   49   3,79
  1,5   50   4,74
2,0 56   6,56
  2,5   65   8,40
3,0 51 9,36

Design tools


PurCalc® software for designing purlins

With the PurCalc® software, the user can design roof and wall purlins produced by Ruukki. The purlins are designed as continuous beams. The purlin type must be the same for the whole structure, but the thickness may vary. One of the purlin flanges is assumed to be supported with the profile sheet. The other flange may be either supported or unsupported. Basic loads such as uniform snow load and wind load can be easily given with a few parameters. Also, more complicated load types, such as snowdrift loads, can be given. The software calculates the necessary fasteners for the supporting structure as well.

Go to PurCalc® software


Please provide the following information when ordering:

  • Type of purlin
  • Thickness
  • Length
  • Number.

In case of pre-punched purlins, please send us purlin drawings showing the location of the holes.




Pre-punching service

Purlins can be pre-punched in our factory. This makes construction on-site faster and easier. The standardised sizes and locations of holes for fixing screws are presented below. Please contact us for additional information about the pre-punching possibilities.

Holes are made during production at continuous line.

Additional information:

  • Max. material thickness 3mm (for ø 60mm max. material thickness 2mm)
  • Holes can be made in a row
  • Oval and rectangular holes can be rotated by 90°.


Type of holeDiameter (mm)Rotation (°)

Technical documents

Here you can find all technical documents related to Ruukki's light weight purlins. Documents are organised by document type. Click to enter document library.

Certificates and approvals

Here you can find all certificates and approvals related to Ruukki's light weight purlins. Documents are organised by document type. Click to enter document library.