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Is
code approval required?
No. Fast-Tube™ is a temporary form, similar to
lumber or cardboard tubes.
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How do I cut the Fast-Tube™?
Run a utility knife through the fabric, it cuts in
seconds. No need to use a portable saw as with cardboard tubes.
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What prevents concrete
leakage from the bottom of the tube?
Place your left hand at 8:00 o'clock and the right at 4:00 o'clock
across from the 2x4s to position and tension the fabric and prevent concrete
leakage. Once there is 6" of concrete in the tube, concrete
pressure will prevent leakage.
Click
here for the installation guide.
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How do I brace and support the Fast-Tube™?
There is a 3 ˝" fabric alignment tab running the length of the tube.
This is sandwiched between two 2x4s to hold Fast-Tube™ in the
correct position. Click here for a 3 minute video.
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How does the Fast-Tube™ center itself?
Place your left hand at 8:00 o'clock and the right at 4:00 o'clock
across from the 2x4s to position to position the base of the tube. Once
there is concrete in the base, it can be moved at the base to ensure
correct location. Spacers can be located on the compression rings
for accurate location.
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What shape does the Fast-Tube™ take when filled with concrete?
Concrete placed in a tube of fabric will take the shape of a perfect
cylinder, as the concrete pressures are always equal in all
directions at the same height.
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Is the Fast-Tube™ prone to water damage?
No - the polyethylene fabric is not affected by water.
Unlike
cardboard tubes, you can leave the Fast-Tube™ out in the rain for as
long as you like.
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How do I strip the Fast-Tube™?
Pull the
welded seam apart, or cut the fabric with a utility knife. As the Fast-Tube™ does not adhere to the
concrete, stripping takes seconds.
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How high can I pour the Fast-Tube™?
This will depend on the diameter. Click
here for details.
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What if there is a tear in the fabric - will this lead to form
failure?
Yes and no. A 2" vertical cut in the fabric will fail with
approximately 3' of concrete head above it. A simple work-a-round
is to pour about a foot of concrete head above the tear, take a break,
and continue pouring after the concrete has 'gone off' sufficiently.
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Can Fast-Tube™ be
used in below 'grade' applications?
Yes. Cut a 1x2 a couple of feet longer than the Fast-Tube™,
and nail the tube weld to the 1x2 with 3/4" shingle nails. Place the
Fast-Tube™ in the hole and fill with concrete. Brace as required.
Click here for detailed
instructions.
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What are the
differences between cardboard and Fast-Tube™?
There are many -
click here for a full listing.
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How do I obtain
architectural reveals with Fast-Tube?
Reveals are obtained by tying a rope around the Fast-Tube™ at the
desired location. Click here for more
details.
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What slump
concrete should I use?
Slump should not exceed 5".
