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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
SLAB/HORIZONTAL
Combiform Rail
Combiform screed rail and form is used in the production of flat slabs. The Combiform screed rail is manufactured from plain sheet
metal and a strip of polyethylene plastic. Available in 7.2' lengths in various heights up to 5-3/4" (125mm). Combiform functions both
as a form and a screed rail on any type of prepared base. Being a stay-in place form, the Combiform will help to control shrinkage
cracks which will occur along the plastic strip. The Combiform screed rail is machine made to close tolerances. The side of the rail is
perforated to allow easy concrete flow and pass through of reinforcing steel up to 7/8" (22mm) in diameter, depending on size. For
installation grade pies are placed on each end and 3' centers. Combiform is set to grade leaving 1-1/2" gap underneath to allow
concrete to fill void (when initially setting, keep concrete cover to maximum 1/2" above combiform flange). When pouring slab
vibration along edge is recommended to fill void. For more installation techniques call Masons.
Drop Extender
Drop extender is a removable plastic strip that attaches to the
normal plastic strip, in the top of the screed rail to provide a 1
3/16" (30mm) concrete cover.
Combiform Selection Chart
MUST VIBRATE
DROP EXTENDER
1-3/16" CONCRETE COVER
Tolerances: Length + 3/16". Height + 1/8", - 1/16"
TYPICAL CONCRETE PAD
APPLICATION
SCREED RAIL
No.
Size
Rec Slab Thickness Wt/Pc (lbs) Pcs/Ctn
CF C45 1-3/4" x 7.2'
3"- 4"
4.4
182
CF C65 2-1/2" x 7.2'
4"
5.1
182
CF C85 3-3/8" x 7.2'
5"
6.2
182
CF C105 4-1/8" x 7.2'
6"
7.7
150
CF C125 5" x 7.2'
7"
9.3
150
CF C145 5-3/4" x 7.2'
8"+
11.0
100
Description Height
H-1 in.
H-2 in. H-3 in. Width Weight/Bundle lbs.
CF C45
1-3/4"
1.2"
3.5"
966.0
CF C65
2-1/2"
1.1"
1.8"
4.1"
1,122.0
CF C85
3-3/8"
1.2"
1.9"
2.6"
4.5"
1,256.0
CF C105
4-1/8"
1.3"
2.1"
3.5"
5.1"
1,285.0
CF C125
5"
1.3"
2.5"
4.3"
5.3"
1,483.0
CF C145
5-3/4"
1.3"
3.0"
5.0"
6.3"
1,177.0
No.
Size
Wt (lbs)
CF EXT
1-3/16" x 7.2'
1.1
SCREEDS