Use and Care Manual

74
Copyright © 2020 MiTek Industries, Inc. All Rights Reserved
Holdowns
Holdowns
MiTek
®
Product Catalog
LSTAD / STAD Foundation Straps
The coined dimples below the embedment line allow for increased
concrete bonding. These holdowns retain high uplift capacity even
when installed at corners of foundation stemwalls. Ideal for use with
built up 2x end posts.
RJ after the model indicates LSTAD or STAD for rim joist
applications as in STAD8RJ. Rim joist models provide for a
17" clear span without the loss of strap nailing.
Materials: LSTAD-14 gauge; STAD-12 gauge
Finish: G90 galvanizing
Codes: IBC, FL, LA
Installation:
• Use all specied fasteners. See Product Notes, page 18. The
bottom (2) nails are for form board attachment only and do not
contribute to fastener schedule requirements.
• Embed holdown in concrete to the embedment line (bend line).
• See illustrations for requirements on rebar, edge distances,
and clear spans.
• Bending the strap horizontally 90° to facilitate wall placement
may cause concrete behind the embedded strap to break away
at the top edge (spalling). If the spall is 1" or less from the top
edge of the concrete, no load reduction is necessary. If the spall
is between 1" and 4" the allowable load is 0.90 of the published
chart load.
• When installing on lumber less than 3-1/2" wide, wood splitting
may occur. To reduce splitting, use 10d (0.148") x 1-1/2" nails
or ll every other hole with 16d (0.162" x 3-1/2") common nails.
Reduce allowable loads per code requirements accordingly.
• These straps do not secure concrete sections together at
cold joints; take other measures to transfer the load. If there
is a cold joint between slab and foundation, the minimum
embedment must be made into the foundation. Fastening
opportunities may be reduced because the slab pour level
may be higher than some nail holes. Using fewer fasteners
will reduce allowable loads. Reduce allowable load by the
code capacity for each fastener not installed.
• To achieve full table loads the minimum center-to-center
spacing is twice the embedment depth (I
E
) when resisting
tension loads at the same time.
• Where fewer fasteners are used in the structural wood
member, reduce loads according to the code.
• There may be an increase in the amount of deection if
the strap is installed on the outside of the sheathing, versus
directly to the framing members.
• Strap may be bent one complete cycle to aid installation.
• For installation in severe corrosion environments, see Corrosion
Information on pages 11-16.
Typical STAD10
middle wall installation
Typical STAD10
corner installation
LSTAD
STAD
STAD_RJ
Typical STAD14RJ
corner rim joist installation
L
CS
W
D
I
E
Install (1) #4 rebar
in shear cone
2x embedment
length + 12" min.
rebar length
L
CS
W
D
I
E
L
CS
W
D
I
E
CS
Edge distance
1/2" min from
corner
Install (1) #4 rebar
in shear cone
30" min rebar length
12" min.
rebar length
Edge distance
1/2" min from
corner
Nailed portion
CS
Install (1) #4 rebar
in shear cone
30" min
rebar length
12" min.
rebar length
Continued on next page