© 2014 Simpson Strong-T
ie Company Inc.
-11-
PRINCIPLES AND GUIDELINES FOR PROPER FASTENING
FASTENING INTO MASONRY MATERIALS
Masonry materials suitable for fastening into include:
- Poured concrete
- Precast concrete
- Pre-stressed concrete
- Grout-filled concrete block
- Horizontal grouted joints
Fasteners are primarily held into masonry by a clamping of the
concrete around the fastener. Factors that influence a fastener driven
into concrete include:
- Depth of penetration
- Compressive strength of concrete
- Fastener spacing and edge distance
- Fastener shank diameter
- Concrete aggregate
.145" & .157" Dia.
Shank Penetration
1
⁄
4
" Stud
Penetration
Concrete block and joints
1"-1
1
⁄
4
"
1
1
⁄
2
"-1
3
⁄
4
"
Concrete 2000-2500 psi
9-10 times shank dia.
or 1
1
⁄
4
" -1
1
⁄
2
"
1"-1
1
⁄
2
"
Concrete 2500-4000 psi
7-8 times shank dia.
or 1"-1
1
⁄
4
"
1"-1
1
⁄
2
"
Precast or prestressed
concrete 4000 psi
5-6 times shank dia.
or
7
⁄
8
"-1
1
⁄
4
"
7
⁄
8
"-1"
PROPER DEPTH OF PENETRATION
FASTENER EDGE DISTANCE ON CONCRETE
Distance should be no closer than 3".
MINIMUM DISTANCE BETWEEN FASTENINGS
.300 and 8 mm headed fasteners – 3" spacing.
1
⁄
4
" and
3
⁄
8
" threaded fasteners – 6" spacing.
CONCRETE THICKNESS
Concrete thickness must be at least 3 times the fastener penetration.
Summary of Contents for PT-22A
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