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Category: How to assemble tubs

Ukko Larch Tub Staves
Larch staves for Ukko tubs
We’ve delivered Larch timbers for our hot tubs and started to manufacture few of them now.
Larch tub floors
Two tubs in production – test fitting at the factory
While we are test fitting few tubs, we would like to explain a little bit what’s involved in our tub assembly.

Step 1: Assemble tub floor

Depending on the size of the tub – tub floors supplied are in 2, 3 or 4 parts for easy transportation:
Tub floor assembly
1.8m dia tub floor – comes in three parts
All that needs to be done is to connect all parts together and screw supplied joists in to place (marked on the tub floor for you):
Tub floor connected together
Tub floor parts connected together with the help of rubber mallet
Tub floor assembled
Joists screwed to the tub floor. (Joists positions are clearly marked on the floor for ease of assembly)
Note: Depending on tub size, there maybe only two joists instead of three.

Step 2: Attach staves on to the tub floor

Once your tub is test fitted, we will mark all the staves 1, 2, 3, 4 and son on. This makes it very easy for you – all you have to do is to follow the sequence:
1st stave attached to the floor
First stave is in place. There’s a duddo at the bottom of each stave to attach it on to the floor
Continue with inserting staves until all the staves are in place:
Attaching tub staves to the floor
Tub staves attached to the floor almost half way..
The last stave (we call it filler stave) is pre-made for you and needs to be placed with the small V – moving two neighboring staves on an angle and using rubber mallet get them attached to the floor:
Filler stave
Filler stave attached to the floor.
Since Larch is harder than Cedar you will always have some staves somewhat separated at the top:
Larch tub staves at the top
Staves at the top before placing top ring in place
This will be resolved once you put stainless steel rings and tighten them up.

Step 3: Tighten bottom and top rings

Go around the tub and mark 70mm on every 5th or 6th stave (this is the distance where the ring will sit on):
Bottom ring
70mm distance from the bottom of the stave to the ring
While tightening the ring, go around and make sure that the ring is evenly sits at 70mm on the tub staves:
Tightening rings
Tightening ring with the help of vise grip
Note: Tighten bottom ring as much as you can. Since it is against the tub floor, it needs to be as tight as you can turn the nut until you cannot move it any more. Before placing the top ring – use car ratchet-strap to tighten top staves. This would make it easier to insert top band and tighten it up:
Ratchet strap to tighten top of the tub staves
Car ratchet strap
Measure 150mm distance from the top of every 5th or 6th stave (this is where top ring will sit on):
Top band mearunment
Measure 150mm from the top of the stave
Tub assembled
Assembled tub with rings and all is left is to put benches inside 🙂

Step 4: Assemble benches

This step is the same as with Cedar Tub… all you have to do is position bench supports and step down where they have to be:
Bench supports and step-down
Position bench supports and step down
Tub Benches
Put bench boards on top of the supports and screw everything together

And that’s it – tub is done!

Larch tub assembled
Finished Tub with benches
Now, all you need is to plumb it up, fill it with water, jump in and enjoy your tub. Call us on 0425 230 785 for more information. Save Save

4 Person Ukko Cedar Tub
Pre-assembled 1.4m dia Ukko Cedar Hot Tub
On customer’s request, this Cedar 4 person tub was pre-assembled and pre-plumbed at the factory. Having this tub here at the moment and waiting for customer to pick it up, we decided to explain a bit more about plumbing and extra space required when considering installing hot tub:
Minimum space for the jet
Minimum distance from the edge of the tub to the jet
Always allow extra space for plumbing. It is not only jets you need to consider. There are skimmer and suction too:
Skimmer/Suction and Jets assemblies
Minimum distance from the gate valve is about 250mm
More extra space you’ve allowed will make it easier for you to install and maintain your tub. As you can see from above image, we’ve designed our jets to be different heights which covers lower and upper back:
Ukko tub jets
All Ukko tubs come with jets arranged at different heights (unless you want them at the same level)
Now minimum distances from the top of the tub to skimmer and the highest jet:
Jet line and skimmer/suction assembly
Standard distances from top to the highest jet and skimmer
And don’t forget that there’s a top ring with rod and if you want to cover that below are the measurements you need to take in to account:
Ring and skimmer
Distances from the top of the tub to skimmer and the top ring
This info will help you when designing enclosure for your tub. Also you need to allow for filter cartridge as it needs to be accessed regularly for maintenance:
Electric Equipment
Filter is top load so you need to have minimum height of the enclosure to be about 950mm in order to take the cartridge out for cleaning.
Now back to jets. Jets are supplied with controls. We always split our jets in to two halves. That is why we have even number of jets in our standard tubs. The main thing to remember is that controls must be above water level:
Air jet controls
Air jets controls must be above water level. Otherwise water will leak from there.
Two ways of doing this:
  • Have your enclosure about 50mm off the top of the tub or
  • Make up a little box for air controls to rise them up above water level.
In conclusion, the more space you allow for plumbing, the easier it will be for you to install and maintain your tub.

Need more info? Call us:

0425 230 785

We are here to help!