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Cedar Hot Tub Assembly Instructions 

 

Introduction: 

Thank you for selecting a Zen Bathworks tub!  Your hot 
tub will provide many years of soaking enjoyment. 
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 before starting the assembly process. 
 

How wooden tubs hold water:  

The tub is 

assembled dry.  Because dry wood will swell a 
significant amount when saturated with water, all 
the joints compress tightly allowing the tub to hold 
water. 

 
Special note:

  

It is important to keep the tub floor and 

side staves 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 
slowing the sealing of the tub. 

 

 

Figure 1.1:  Cover, floor panels, staves, compression 
straps, benches.

 

 

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.  

 

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 

#2 square drive and Philips bit for screw gun  

Carpenters’ level (2’ or longer) 

15/16” open end, socket, or crescent wrench 

Vise Grip pliers 

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 section 4 

 

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:

  Good drainage is vital so that 

water from splashing, overflow, cleaning and draining 
operations can be carried away from the site.   
 
There are four basic styles of foundation for your tub. 
You may consider a concrete pad, a gravel pad, piers 
made of concrete or treated wood, or a deck.  
See Figures 3.1 through 3.4 for ideas. 

REV: 2018.01.11

 

Summary of Contents for Cedar

Page 1: ...elp 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 Figure 2 1 t...

Page 2: ...er block is available at most home improvement stores and allows you to adjust the level of the tub after it is in place Piers can be set into the ground to make a solid foundation for the tub This me...

Page 3: ...42 72 72 42 8 ellipse 4 48 80 80 48 Figure 4 1 Chine joist specifications Note lengths are approximate The chine joists must be 4x6 or larger Pressure treated lumber is recommended because it will no...

Page 4: ...g lawns or other landscape plants Do not use on vegetables Place the long 1 16 x 3 4 inch stainless steel spline in the slot on the edge of one half of the floor this may have been done in advance by...

Page 5: ...e the edge of the tub floor inside of the bevel so that they will not interfere with the placement of staves You may want the floor to have a slight tilt toward the drain 1 4 This can be accomplished...

Page 6: ...are adding Use it to observe how tight and consistent the gap is between staves Use the mirror and mallet to adjust this gap to keep it tight and consistent as you proceed Now work clockwise to your...

Page 7: ...sure you have the correct number It is okay for the last stave to be a loose fit HOWEVER will need to distribute that excess space gap around the tub by adjusting the position of the staves Use the m...

Page 8: ...so the strap will stay in place only a few turns Figure 7 1 first compression strap loosely in place Now install the other straps and position as shown in Figure 7 2 The position of each bolt clamp sh...

Page 9: ...Work from the opposite side toward the bolts in one direction then from the opposite side toward the bolts in the other direction In this way the tub is tightened evenly Work around the tub hitting e...

Page 10: ...ose of the silicone is to slow the initial seepage from the dry tub allowing the wood to absorb more water and swell more quickly Your tub will hold water as a result of the expansion of the wood caus...

Page 11: ...ity Alternatively you can build a set of steps that work best for your site design Cover The vinyl and foam cover is the main insulation for your tub It should provide years of good service Avoid punc...

Page 12: ...water well add additional water to about the half full level and wait again for at least an hour Follow this pattern of adding in stages and waiting until the tub is holding water well If the tub has...

Page 13: ...illed whenever possible Remember that a wooden tub is a dynamic object and the wood will swell and shrink with exposure to water or lack of it Like a wooden boat it will seep water at first then swell...

Page 14: ...ists under the tub If the foundation is uneven the tub will need to be drained and moved and the foundation problem fixed 4 Wood sawdust is one of the simplest and most effective ways to stop leaks Th...

Page 15: ...structions prior to using a product and use only as directed Never add chemicals when people are in the tub Store chemicals in a cool dry location out of direct sunlight We recommend that you change t...

Page 16: ...Floor Drain Assembly Tub Light Optional 16 REV 2018 01 11...

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