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Prepare the base for my outdoor modular sauna kit

Wooden sauna base for outdoor home sauna kitIMPORTANT: First note that the exterior size of our prefab modular saunas is 8" wider and deeper than the size in the title. For example, a 5'x7' outdoor home sauna kit (the title reads 5'x7') has an exterior measurement of 5'8' x 7'8" — thus, this is the minimum size of your sauna base.

In the pic at right, we used pressure-treated wood to start our outdoor sauna base. We did this mostly to expedite our video and it was easy to take down after, and makes sense if you know you will relocate your sauna. This base is still a fine choice for your application. You may want a better floor than plywood though.

The outdoor modular sauna kit will sit well on any of these bases:

  • Pour a concrete slab. Leave concrete surface bare or lay tile over the top.
  • Tamp down gravel and lay patio pavers over.
  • Gravel with pressure treated wood works well also. In fact, if you know you will be relocating your sauna, it's even easier to bring your base with you. See step 1 of our How to Build a Sauna | Setting up the DIY Prefab Modular Sauna Kit.
  • Build a wood deck and install marine plywood on your joists, and then put tile or sheet vinyl on the plywood for a vapor proof surface.