MASCO Concrete Forming & Accessories (Updated 4/2016)

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46 MASONS SUPPLY COMPANY
Oregon (800) 537-3407 ♦ Washington (800) 537-6216
Clackamas | Eugene | West Eugene | Hillsboro | Medford | Portland | Salem | Wilsonville | Ridgefield | Seattle | Tacoma | Woodinville
M A S C O . N E T VERTICAL FORMING SYSTEMS
Jahn® Forming System
Preparation:
Gang drilling the plywood is the only preparation
required. Holes need to be drilled 1/8" larger than the
snap tie head. Normally a 9/16" diameter drill bit will
be required. We recommend you drill a maximum 5
plywood panels.The 5/8" take-up of the eccentric on the
Jahn "A" Bracket allows a snap tie with a L&W dimension
of 4-3/4" to be used with a 5/8" or 3/4" plywood. The 5/8"
take-up on the "C" bracket allows it and 81/4" snap ties to
be used on 5/8" plywood.
Snaptie Spacing and Rate Placement:
The most common snap tie spacings being used with the Jahn Forming System are shown below. For different
rates or pour and/or other tie spacing, contact Masons Supply. Refer to the back cover for addresses and
phone numbers.
Gang Drilling
of Plywood
12" vertical x 24" horizontal
Snaptie Spacing.
16" vertical x 24" horizontal
Snaptie Spacing.
12" vertical x 12" horizontal
Snaptie Spacing.
Plywood Used Strong Way (Face Grain Parallel to Spacing)
Notes: The above recommendations are based on the use of 3/4" Plyform Class I, and 2x4 S4S studs (Douglas Fir-Larch,
Southern Pine or equal having a minimum allowable fibre stress of 1,200 psi). Design is based on all formwork members
being continuous over four or more supports. Normal weight concrete made with type 1 cement, no admixtures or
pozzolan, slump no more than 4 inches and vibration limited to 4 lineal feet or less.
6"
12"
12"
12"
12"
12"
12"
6"
12" 24" 12"
4'-0" 4'-0" 4'-0"
12" 24" 12"
8"
8'-0"
16"
16"
16"
16"
16"
8"
8'-0"
12" 12" 12" 12"
12"
12"
12"
12"
12"
12"
12"
12"
8'-0"
12"
SNAPTIE SYSTEM