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Wind Mitigation Roof to wall attachements

Section four of the wind mitigation form is about roof to wall attachment. Specifically how is the roof system secured to the wall structure and what is the weakest connection type.

A. Toe Nails Rafter/truss anchored to top plate of wall using nails driven at an angle through the rafter/truss and attached to the top plate of the wall.
B. Clips Metal attachments on every rafter/truss that are nailed to one side (or both sides in the case of a diamond type clip) of the rafter/truss and attached to the top plate of the wall frame or embedded in the bond beam.
C. Single Wraps Metal Straps must be secured to every rafter/truss with a minimum of 3 nails, wrapping over and securing to the opposite side of the rafter/truss with a minimum of 1 nail. The Strap must be attached to the top plate of the wall frame or embedded in the bond beam in at least one place.
D. Double Wraps Both Metal Straps must be secured to every rafter/truss with a minimum of 3 nails, wrapping over and securing to the opposite side of the rafter/truss with a minimum of 1 nail. Each Strap must be attached to the top plate of the wall frame or embedded in the bond beam in at least one place.
E. Structural Anchor bolts structurally connected or reinforced concrete roof.
F. Other: ______________________________________
G. Unknown or Unidentified
H. No attic access

Other than none, toe nails is the weakest attachment and the attachment is generally stronger moving from choices A through E.

It is important to note that straps are not the same a wraps. A strap must be placed next to the truss and be nailed on both side to be classified as a wrap. If it does not it is usually listed as a clip. Structurally connected walls are usually incorporate concrete roof decks but the home may also be built and designed with I-beams or some other similar construction design, which is fairly rare.

Here are some examples:

Toe Nail

Toe Nail

Hurricane clips

Hurricane clips

Non wrapping strap

Non wrapping strap

Single Wrap

Single Wrap

Next: Roof Geometry