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Shear Transfer Ties

Shear Transfer Ties in No Cripple Wall Retrofits

Below is an image of what it looks like under a house without a cripple wall.    The red arrows represent earthquake forces trying to slide the floor off the foundation.  The joists that sit on top of the mudsill are called end joists on one side of the house and rim joists on the other side

Earthquake Forces on Joists

The way this sliding is corrected is by attaching the end joists and rim joists to the mudsill with Shear Transfer Ties, sometimes known as framing anchors.  A large variety of shear transfer ties are available and a contractor must know which one to use when confronted with every imaginable framing configuration.  Given that many houses were built without a building code, the varieties of floor framing are legion.

Below are the types of Shear Transfer Ties available.  These are also known as framing anchors.

L70, L90, LS70, LS90, A23, A35,

LTP4, H10R, H10, H2.5, lag bolts,

12d toenails, 8d toenails, 15 gage staples

Often they must be fabricated out of wood on site.

Shear Transfer Tie Restrained by STT

Each Shear Transfer Tie can resist a certain amount of force.

Below is a photograph of a single L90 Shear Transfer Tie.  It is nailed at the back to the floor framing and at the bottom to the mudsill.   (The bottom nailing to the mudsill  is not visible in this photo.)  The Shear Transfer Ties transfer earthquake force into the mudsill.

Single L90 with Arrow

 

 

 

  • The image below shows how Shear Transfer Ties are part of a system.  The yellow arrow represents earthquake forces pushing against the floor you walk on.
  • The white arrow is force going into the Shear Transfer Tie which tries to make the mudsill slide.
  • Finally the red arrow shows that force  entering into the Foundation Anchor and into the Foundation.
  • Again, this is only one kind of Shear Transfer Tie.  There are many others.

Screenshot at Sep 08 19-17-34

Below you can see how Shear Transfer Ties are used when new mudsills are placed on the side of the foundation.

 

Screenshot at Aug 30 17-44-13

 

Shear Transfer Ties

The houses below were bolted, but the floor was not attached to the mudsill with nails or Shear Transfer Ties.

This is the first house

This is the first house

Blue House With Arrows

Blue House with Arrows

This is the third house

This is the third house

 

 

 

 

 

Types of Shear Transfer Ties

There are many types of Shear Transfer Tie hardware but they have different strengths and some are suitable for retrofits and some are not.

Below is a small sampling of shear transfer ties.  In retrofit work there are many others

This is the shear transfer ties

 

 

 

 

 

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San Jose,Sunnyvale, Fremont,Oakland,Berkeley
And Surrounding Areas
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Works' Comp RWCC64393236
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