Construction screws

Construction screws are an essential part of building and renovation projects, providing reliable and durable fastening solutions for a wide range of needs. Construction screws are specifically designed for joining load-bearing structures, frames, and other building elements. They are often required to have approvals such as ETA and CE, as well as to meet strength and corrosion resistance requirements.

Features:
Suitable for wood, concrete, lightweight concrete, and steel
Often required: strength class, coating, fire resistance
Possible ETA approval (European Technical Assessment) → use in load-bearing structures

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Construction screws

Certificates and approvals:

ETA (European Technical Assessment) - Ensures that the screw is suitable for load-bearing structures
CE marking - Product complies with EU requirements
DoP (Declaration of Performance) - Performance document → required under the Construction Products Regulation
Fire classification (sometimes required) - Used, for example, in facades or fire-separated structures

1. General-purpose screws (general construction screws)

  • Use: indoor woodworking, furniture, board installation
  • Material: hardened steel, zinc-plated
  • Head: countersunk head (often Torx), sometimes pan head
  • Pre-drilling: not required for softwood
  • Not for load-bearing structures unless ETA-certified

2. Structural screws (timber construction screw / framing screw)

  • Use: load-bearing timber joints, e.g. frame structures, roof structures
  • Long, partially or fully threaded
  • Countersunk head (most common) or flange head
  • Torx drive (usually TX40-TX50)
  • ETA approval often available
  • Examples: Spax, Klimas, SKT, Promart

3. Self-drilling screws

  • Use: sheet metal, steel frames, metal structures
  • Cutting/drill point tip – no pre-drilling
  • Head: pan head / hex screw (e.g. for metal roofing)
  • Flange head / countersunk head
  • Available in stainless steel (A2/A4) and zinc-plated versions
  • ETA approval only for certain special models

4. Drywall screws

  • Use: fastening drywall panels to framing
  • Fine thread, black phosphated finish
  • Head: countersunk / Torx / Phillips
  • Not used in load-bearing structures

5. Facade screws and deck screws

  • Use: exterior cladding, decking
  • Often requires stainless steel (A2/A4) or a hard coating
  • Also available as hidden fastening screws - for deck construction
  • Outdoor use → corrosion protection is especially important - exposure class

4. Concrete screw (Sormat, Index, Fischer)

  • Use: fastening directly into concrete
  • The screw cuts threads into the drilled hole
  • Quick to install → alternative to anchors
  • CE and ETA approval are important for load-bearing connections
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