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Hot Tub Assembly

This is a general guide for wood fired hot tub assembly which outlines some key considerations. We offer several different hot tub models, including both internal and external heater, and you should always refer to the assembly manual which is included with your particular unit. 

What is involved in hot tub assembly? 

All our hot tubs kits come ready for easy DIY assembly. No cutting or sawing is required. All the lumber is pre-cut and grooved. You will need is a large rubber mallet, tape measure, screwdriver or cordless drill, spirit level, pliers, 15/16" wrench. The kits are designed to be assembled by DIY enthusiasts with an average level of handyman skills. Professional carpentry skills are not required. 

It is important to choose a site that has a level, strong, and stable foundation. This is critical, because a hot tub full of water can weigh several tons. (see weight chart below) It's also important to choose a site with good drainage, so that water splashing or overflowing can be carried away from the site. Also if you are emptying your tub for regular cleaning, good drainage is a must.

Wood Fired Hot Tub Capacity and Weight
Tub Size    Gallon Capacity    Weight (LBS)
5' x 3'                 315              3010
6' x 3'                 470              4380
7' x 3'                 660              6000

There are various options for constructing a foundation for your hot tub. Common options include include concrete blocks, cement slabs, beams or railroad ties. Concrete slabs (at least 4" thick) reinforced with wire mesh provide the most permanent and secure foundation and are recommended where practical. Most other foundations can be prone to uneven settling which may cause the tub to leak.

Concrete Pad

If possible, the best option for the site of your hot tub is sitting atop a concrete pad (patio). If this is done properly (compacted well and levelled), you will maximize the life of your hot tub. The concrete pad should be 4" thick and be reinforced with mesh to minimize cracking. If you want to maximize the lifetime of your hot tub and decide to use a concrete pad, we recommend constructing the pad significantly larger than needed for the hot tub alone, as this will allow room for accessories such as chairs and tables. There is a wealth of information available online with instructions on how design and pour a concrete pad. 

Gravel Foundation

Another popular option is to use compact gravel foundation. This works well if the ground underneath is compact and stable. If soil is unstable, do not use this option.

To construct a gravel foundation, first frame out an area with pressure treated wood sleepers. Then dig a pit approximately 6" deep and fill it with crushed rock. Crushed rock is preferable to pea gravel because it will be more stable and doesn't shift as much. Smooth the crushed rock with a rake and check with a carpenter’s level. A gravel base will settle over time and may need re-leveled, but this can be done easily while the tub is empty and being cleaned. Ensure the gravel bed is large enough to allow for drainage and can absorb water overflow and minor leaks from the tub. We recommend constructing the pit large enough to leave approximately a 12" buffer around the tub.


If you have ever seen a hot tub on a deck, you know it is a wonderful place for a hot tub. It looks great, and it is close to the house, meaning you will maximize your usage of the hot tub. If you choose to install your hot tub on a deck, be sure that your deck has been designed to support the weight of a full tub (see weight chart above). We recommend you have the deck inspected by a qualified architect or building engineer prior to proceeding.