Wood joints in structural (prefabricated) timber constructions: timber (frame) constructions, formworks, rafter and shifter attachments, lateral pressure and thrust reinforcement, hall constructions, renovation of ceilings, on-roof insulations

Installation indoors or in dry areas of wet rooms

Outdoors without direct weathering

Advantages:

Strong and efficient
- Maximum load-bearing capacity due to full thread in inclined angle screw connection
- High-tensile steel for increased breaking torque (max. torque value in ETA)
- Time-saving compared to load-bearing timber connections with joist hangers, joist supports, etc.
- Energy-saving screwings by special anti-friction thread coating - reducing screw-in torque (screw-in resistance)
Versatile applications
- Screw-in angle between 0° and 90° in grain direction (roof insulation: 30° - 90°)
Maximum safety and high product quality
- Ensured by ETA-12/0197 (Timber Constructions), ETA-12/0196 (Wood-Concrete-Composite) and external independent testing institute

Processing information

Please note pre-drilling instructions in different timber types in ETA-12/0197 (section 3.11) or ETA-12/0196 (timber-concrete-connections)
Fixing of thermal insulation must also comply with local applicable national regulations
For on-roof fastening, screws have to be driven into the rafter in one sequence through battens and thermal insulation material without pre-drilling (ETA-12/0197: Annex F)
When using metal attachments (screw-head-side), pre-drilled hole in metal part must be larger than thread-outer-Ø.
Dimensioning load-bearing capacity metal-wood-connections: sheet thickness = min. 1.5 mm
Thickness insulating material: max. 400 mm
Screw/ center distance: max. 1750 mm
Angle between screw axis and grain direction of rafter: 30° up to 90°
Required batten dimensionings (bmin = minimum width / tmin = minimum thickness):
Screws Ø 8.0: bmin = 50 mm / tmin = 30 mm
Screws Ø 10.0: bmin = 60 mm / tmin = 40 mm.
Load-bearing, approval-relevant timber constructions always have to be calculated by structural engineer with ETA of applied screws
Design of fastening points/ overall construction must be based on characteristic load values of each screw type and installation specifications indicated within ETA-12/0197 or ETA-12/0196
Wind suction forces and bending stresses of battens or boards must be taken into account for the design. If necessary, additional screws can be arranged transversely to the direction of rafters (90° angle)
For approval-conform fastenings, standardized wood types listed in ETA-12/0197 / ETA-12/0196 must be used

Datasheets & Downloads

Language

Type

Art.No.

Approval/Assessment

ETA-12-0197_WoodConstructionScrews_07-2017

Verschillende toepassingsgebieden vereisen verschillende schroef- en draageigenschappen van een schroef. Opmerking: Voorboren wordt met name aanbevolen voor schroeven die zeer dicht bij de rand komen of om het risico op splijten te verminderen.

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