Weckman Progantti is the latest masterpiece of Finnish tinsmith know-how – the most advanced interlocking roofing sheet on the market. Innovative construction solutions make Prograntti the quietest and best ventilated roof. Interlocking roof sheet perfected to every detail. Its unique installation system and composed elegance guarantee a good result for any roof.

Steel thicknesses 0.5 mm and 0.6 mm.

Available in quality class Premium 50 and Standard 40.

Spruce green RR11
Grey RR21
Dark grey RR23
Red RR29
Dark brown RR32
Black RR33
Tile Red RR750

Impressive and top-quality Weckman Progantti


The Progantti roof package is quiet.


The roof is ventilated according to regulations in all conditions.

Waterproof also on a gently sloping roof

The seam construction guarantees waterproof roofs with inclinations as low as 1:8 without additional seals.


Progantti roofing sheet made of extra strong 320 quality structural steel. Durability classification of up to 50 years.

A beautiful roof

Thanks to its perfected details, Progantti makes a beautiful roof.

Easy to install

The advanced interlocking structure facilitates installation.


Durable, low-maintenance and long-lived.

A wide range

Several profile, colour and coating options and raw material thicknesses.

Technical information and roof accessories

Weckman Progantti

Weckman Progantti

Nominal effective width

475 mm

Total width

¨505 mm

Minimum length

1500 mm

Maximum length

15500 mm

Profile height

29 mm

Raw material

0,5 tai 0,6 mm structural steel

Steel quality


Fire rating

BROOF (RakMk E1)

Minimum recommended roof inclination


Rib interval

300 mm


Dimensions according to SFS-EN 508-1 tolerances

Exclusively from Weckman

The WECKMAN side fastening solution allows free thermal expansion of the roofing material and reduces wrinkling of the material and resulting noise.

The WECKMAN ventilation system ensures sufficient ventilation of the roof in Weckman’s ridge structure even in cold weather. Moisture escapes through the ridge without condensing on the underside of the roofing, minimising the risk of damage to the underlying structures.

Installation accessories for Weckman Progantti roof

Guaranteed durability and safety

Finish your Weckman roof with an impressive and practical drainage system. Trough gutters and gutter pipes are manufactured of hot galvanised steel, which is Pural-coated on both sides. The benefits of the coating are excellent corrosion resistance, good cleanability and durable appearance. Standard colours: white, red, dark grey, dark brown and black .


Down pipe

Down pipe set for 3.0-metre eaves, eaves-heights of over 3 metres with extension parts.

Trough gutter

Standard length

Standard length Standard length 3.0 m, 4.0 m or 5.0 m. Outer bracket and overlap piece as standard.

Safe and durable Weckman roof safety accessories

Wall ladders guarantee safe entry onto the roof. A roof bridge ensures a safe passage on the roof in connection with, e.g., chimney sweeping, snow dropping, antenna installations and other tasks on the roof. Snow breakers are designed to prevent damage caused by snow dropping and to protect the roof coating. All roof safety accessories are reliable and high-quality Finnish products.


Weckman ladders are made of hot galvanised oval tubes without weldings. The steps are round tubes. Wall ladders come in powder-coated or galvanised styles and roof ladders are only available powder-coated.Standard colours for roof and wall ladders: white, red, dark grey, dark brown and black.


Standard lengths 1,2m, 2,7m, 3,3m, 4,2m, 4,5m, 5,4m, 6m, 6,6m, 7,5m, 8,4m. The ladder set includes the ladder frame and wall mounts.


Standard lengths 1,2m, 2,7m, 3,3m, 4,2m, 4,5m, 5,4m, 6m, 6,6m, 7,5m, 8,4m. The ladder set includes upper arcs for the ladder frame and wall mounts (for an eaves width of 85–100 cm).


1,2m, 2,7m, 3,3m, 4,2m, 4,5m, 5,4m, 6m, 6,6m, 7,5m, 8,4m. Includes the ladder frame and wall mounts.

Roof bridge

A roof bridge can also be used for the construction of work platforms and stairs on the roof. Weckman roof bridges are safe, have a snow permeation capacity of over 50% and are classified as class 2, allowing the fastening of safety ropes. The roof bridges are powder coated. Roof profile-specific roof mounts. Standard colours: dark grey, red, dark brown, black, tile red.


Standard lengths 1.21 m (3 roof mounts), 2.47 m (3 roof mounts) and 2.97 m (4 roof mounts).

Snow breaker

In Finnish conditions, snow breakers are necessary where people pass by.Weckman tube snow breakers are made of hot galvanised steel.The snow breaker is delivered either galvanised or powder-coated.Two oval tubes, four roof mounts according to the roof sheet.Standard colours: dark grey, red, dark brown, black, tile red.


3000 mm

Weckman quality is ensured by manufacture according to the ISO9001 quality system. Weckman quality can also be identified by the CE certification, as all of our steel products fulfil the requirements of standards SFS-EN 14783:2006andSFS-EN 1090-1:2009+A1:2011. Each of our employees has taken on our goal of keeping work high-quality and faultless.

Weckman Premium 50

Weckman Standard 40

Weckman Progantti installation