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Cedar Hot Tub Assembly, Installation &
Introduction:
Thank you for selecting a Zen Bathworks tub! Your hot
tub will provide many years of soaking enjoyment. Even
if you purchased your tub factory pre-assembled, or are
hiring someone else to assemble it for you, please read
and understand these instructions as they contain many
relevant sections. Having an understanding of how your
tub went together and works is important, and will
increase your ability to maintain your hot tub properly. If
you are assembling your tub from a kit, assembly will be
easier if you follow the correct sequence of steps and use
the proper tools. Please take the time to read the
instructions completely and carefully.
How wooden tubs hold water: The tub is
assembled dry. When saturated with water the dry
wood will swell significantly. As the wood expands,
all the joints compress tightly allowing the tub to
hold water, provided it was assembled properly.
Special note: It is important to keep the tub floor and
staves (The staves are the vertical wood parts that make
up the sides of the tub) stored in a dry place until
assembly time . If the tub gets wet prior to assembly, the
wood may swell to a larger size making assembly much
more difficult and encumbering the sealing of the tub.
Figure 1.1: Left to Right: Cover, floor sections, staves,
retention bands, bench segments.
Section 1: Packing List
Locate the enclosed packing list to identify and confirm
that all items are included. A copy of the packing list is
inside the packaging. See Figure 1.1 to help identify the
major parts.
Section 2: Tools and Supplies Needed
A few basic tools and items are needed to complete the
assembly of your new tub. Gather what you will need
before you start.
Maintenance Instructions
1 of 16
Figure 2.1 tools required
✔ A large rubber mallet (handle the length of a normal
hammer, head the size of a soup can)
✔ Small tape measure
✔ Screw gun
✔ Torx® T25 bit for screw gun
✔ #2 Square drive bit for screw gun
✔ Carpenters' level (2' or longer)
✔ 15/16" open end, deep socket, or adjustable wrench
✔ Vise Grip pliers, channel locks, or large crescent
wrench
✔ Caulking gun or squeeze tube of clear silicone
✔ Medium sized pipe wrench
✔ 4" x 6" timbers for floor support - referred to as "chine
joists" in this manual
Section 3: Site Preparation
Before assembling your tub, prepare a suitable spot for it.
Hot tubs will weigh from 1500 to 8000 lbs. when full of
water - so a stable foundation is essential. Cedar tubs
should be installed outdoors. You must provide for good
drainage and a solid foundation .
Outdoor installation:
water from splashing, overflow, cleaning and draining
operations can be carried away from the site. If not,
debris will collect around the lower areas of your hot tub
causing wood deterioration over time. Remember, wood
lasts longest either fully submerged, or ventilated .
Prolonged dampness will cause wood rot over time and
should be avoided wherever possible.
Good drainage is vital so that
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Summary of Contents for ZEN Cedar
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Page 1: Section 1: Packing List
Before assembling your tub, prepare a suitable spot for it. Hot tubs will weigh from 1500 to 8000 lbs. when full of water - so a stable foundation is essential. Cedar tubs Figure 1.1: Left to Right: Cover, floor sections, staves, should be installed outdoors. - Page 2 There are four basic styles of foundation for your tub. the size of the tub). Have the deck inspected by a You may consider a concrete pad, a gravel pad, piers qualified architect or building engineer prior to made of concrete or treated wood, or a deck. proceeding.
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Page 3: Section 4: Tub Supports - Chine Joists
IMPORTANT: If you choose to put a partial or full surround deck next to your tub, build it with a 1”+ The chine joists must be 4”x6” or larger (do not use gap from the outside of the tub. There should be no 4x4s) . -
Page 4: Section 5: Drain & Floor Assembly
1” pipe (either flexible or rigid). Use schedule 40. Figure 4.3 Typical placement and orientation of chine joists, drain, and floor seam. 6’ Round tub, as seen from If you follow the Zen Bathworks sanitation regimen, below. water from your tub is safe for watering lawns or other landscape plants.We do not recommend using it for plants... -
Page 5: Section 6: Staves
Check that the drain is placed properly and that the joists do not interfere with it. At this time consider the placement of the benches as well - making sure that the drain will not be underneath a bench where it will be hard to access. - Page 6 bottom, directly over the dado, until it just meets the staves will minimize the slight differences in stave pencil line that has been scribed about 9/16” from the heights, causing the rim to not be perfectly smooth. edge of the top of the tub floor. However some slight differences will still be present.
- Page 7 Remember, a spot that needs special attention is the opposite end(s) of the floor seam(s). You must avoid having the floor seam line up directly with a seam between staves. If you followed our numbering, we have accounted for this already. If not, sort through the staves and find a couple of narrower or wider staves to switch in to solve the problem.
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Page 8: Section 7: Retention Bands Placement
persistent leaks for years. Take your time and get this part right. You’ll thank yourself later. Once you’re confident you’re ready, proceed as follows: First, locate the stainless steel retention bands. They supply the external support needed to keep the tub compressed, directing the force of swelling to cause the wood pieces to come together, instead of just outward. -
Page 9: Section 8: Retention Bands Tightening
staggered. Also, t he bolt clamp should straddle a seam between staves. Section 8: Retention Bands Tightening Time needed: approximately 30 minutes Alternative band technique: Loosen bolt almost all the This step is best done with two people, however it can be way, but leave attached –... -
Page 10: Section 9: System Components & Accessories
few steps – loosen the bands a bit and distribute the gap as described earlier. Now do a final tightening - but don’t overdo it. The bottom band is pressing against the floor on the inside, so it will reach a point where you can tell it is very tight - don’t force it beyond that. - Page 11 Consider using packaging foam or cardboard to protect Tub Diameter Number of Bench the floor of the tub if you decide to enter the tub for this (feet) benches arrangement step. 4 round One end 5 - 8 round Full circle Finally attach the benches to the blocks by placing the 4 ellipse One end...
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Page 12: Section 10: Finishing The Exterior Of Your Tub
Do period. this often to maintain the beauty of the cedar, especially at first. The best regimen is to apply as much as the tub will Warm water accelerates the swelling of wood. If you absorb once or twice during installation, and then another have access to fill the tub with warm or hot water, don’t... -
Page 13: Section 12: Water Sanitation Instructions
● Always shower before using the tub. harmless, even health beneficial, in fact. Also, the aroma of cedar is due to these oils. Change the water frequently ● Always read the label instructions prior to using a (weekly or biweekly) at first to help clarify the water. This product and use only as directed. -
Page 14: Section 13: Tub Safety
● We recommend that you change tub water every 4 and shrink with exposure to water or lack of it. Like a wooden boat, it will seep water at first, then swell shut. to 8 weeks. Leaving the tub empty for a few days for maintenance or cleaning is normal and fine. - Page 15 If you can’t find it or need more, you may be able to find some locally at a woodshop or we can send some to you. It doesn’t have to be cedar, but it does have Section 15: Tub Troubleshooting to be flour-like consistency;...
- Page 16 The cover has a manufacturers’ limited warranty of four years. Heating and pump equipment has a limited warranty of one year. The warranties, when valid, will only cover replacement parts and materials. Under no circumstances will Zen Bathworks be held liable for any cost of labor or damage.
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