Use and Care Manual

Holdowns

MiTek

Product Catalog

Allowable loads and deection values for holdowns such as TD, PHD,

TDX, HTT and UPHD are based on installation with the anchor bolt

aligned directly below the centerline of the holdown. The maximum

tolerances for anchor bolt offset are described below.

Designer should consider that installation of a holdown raised above the

sill plate may result in higher deections. These deections are different

for every installation and should be calculated by a certied designer.

Installation:

• Holdown installed at maximum of 2' above the bottom plate.

• Anchor bolt installed at maximum 2" away from the centerline

of the holdown.

• Threaded rod angle must not exceed 5 degrees or a pitch of 1/12.

• A threaded coupler must be used at the anchor bolt connection

capable of developing 125% of strength of the rod.

Alternate installations:

1. Install additional full-height member(s) to the existing stud(s)

or post to reduce the horizontal distance between the anchor

bolt and the vertical member(s).

• Multi-ply studs/posts must be fastened together to act as

a single unit. Holdown fasteners must not be considered

to contribute to fastening multiple members together.

• Added members shall be of equal or better wood species.

• Designer must consider any effect of additional eccentricity

introduced on the connection.

2. Using a threaded rod epoxied into place at the proper location in

lieu of cast-in anchor bolts. These can be installed after the rough

framing is completed.

Holdown Offset Anchor Bolt Notes

Full height stud

or post per plan

MiTek holdown

per plan

Threaded rod to

match anchor bolt,

double-nut at holdown

Threaded coupler

capable of developing

125% of strength

of the rod

Foundation

Anchoring device

Max