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Frequently Asked Questions
What is a twist strap for?
Carrying tension around a corner, between members at right angles.
The steel is formed with a ninety-degree twist along its length.
One end lies flat in one plane and the other in the perpendicular plane.
A rafter to a wall plate is the classic case.
So is a post to a beam or framing changing direction.
A flat strap cannot do this without being bent.
Why not just bend a flat strap?
Because bending galvanised steel on site work-hardens it and cracks the coating.
It also voids any published rating.
The connection then has no capacity anyone can quote.
Cracked galvanising is a corrosion starting point.
A twist strap arrives already formed and tested.
Its capacity was measured in exactly that shape.
What if the members are not at ninety degrees?
Then a twist strap is the wrong part and a skewed connector is right.
The strap will not sit flat on both faces.
A strap bearing on an edge concentrates load where the steel is weakest.
Persuading it into position introduces exactly the bending problem being avoided.
Both faces have to bear properly.
Purpose-made angled connectors exist for non-square geometry.
Does the twist add strength?
No - the fasteners at each end carry the rating.
The twist provides geometry rather than capacity.
Filling one end fully and the other partly gives the weaker end's value.
The schedule states the count required at each end.
Fastener type is specified as well as number.
That principle holds across every connector in this family.
Are twist straps handed?
Some patterns are and others are symmetrical.
The direction of the twist determines which way the strap wraps.
Left and right versions exist in some ranges.
Checking before ordering a quantity avoids the wrong hand arriving.
Manufacturers state whether a pattern is handed or universal.
On a large order the difference is worth confirming rather than assuming.
Where are they typically used?
Wherever perpendicular members must be held together in tension.
Rafter or truss to wall plate is the most common.
Post to beam connections use them frequently.
They also appear at changes of direction in framing.
Uplift resistance is a typical reason for specifying.
Whether one is required at all comes from the local code and the loading for the site.
Do they need particular corrosion protection?
Suited to the exposure over the building's life, not the day of installation.
Straps at roof level are frequently in damp, ventilated spaces.
Treated timber attacks standard galvanising readily.
Concealed straps cannot be inspected once the structure is closed.
Fasteners must match the strap's corrosion class.
Specifying generously costs very little relative to the consequences of getting it wrong.