Hobson technical article
Warning: Self-Drilling Wing Screws and Long Timber Lengths on Steel
A one-page Hobson technical note on self-drilling wing screws used to fix strip flooring or decking to steel, covering the countersunk ribbed wing screws in Class 3 and zinc yellow.
What this covers
- Recommendation
- Why screws break
- Screws covered
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Wing screws are not recommended for fixing long lengths of timber, including treated pine decking, directly to steel joists or supports.
- The screws may break because the timber and steel move against each other, from changes in humidity and moisture content, thermal expansion, building movement or settling, and overdriving during installation.
- Covers the countersunk ribbed wing screws: T9PG3RQ (Class 3, square drive), T9PG3SI (Class 3, hex drive) and T9PGYRQ (zinc yellow, square drive).
Who it helps: Deck and floor builders fixing timber to steel framing.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.