Use and Care Manual

76
Copyright © 2020 MiTek Industries, Inc. All Rights Reserved
Holdowns
Holdowns
MiTek
®
Product Catalog
HPAHD / PAHD Foundation Straps
Designed to anchor wood framing to poured concrete foundations.
Materials: See chart
Finish: G90 galvanizing
Codes: See chart for code references
Installation:
• Use all specied fasteners. See Product Notes, page 18 .
• 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 in accordance with code requirements.
• Straps are to be installed at the edge of concrete. Install prior to pour
by nailing to form. Drive temporary nails through lowest two nail holes
into form. Concrete level should reach embedment line; minimum
embedment depths are listed in chart.
• Do not rely on these straps to secure concrete sections together
between 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 re-
duced 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.
• Allowable loads based on a minimum concrete compressive strength
of 2,500 psi at 28 days, with one #4 horizontal rebar in the shear cone.
Rebar should be a minimum length of 2x embedment depth plus 12"
(see chart for exceptions in corner installations).
• 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 HPAHD22
single pour midwall
installation
Typical HPAHD22
single pour corner and
endwall installation
Typical HPAHD22
single pour rim
joist corner installation
HPAHD
PAHD42
HPAHD22 form board
installation
2x embedment length
+ 12" min rebar length
Install (1) #4 rebar
in shear cone
1/2" min
from corner
(1) #4
rebar in
shear
cone
Nailed portion
13-1/2"
12" min
rebar length
1/2" min
from corner
30" min
rebar length
Install (1) #4 rebar
in shear cone
H
W
D
Embedment
line
I
E
W
Embedment
line
H
D
I
E
D
I
E
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