Furnishing a Sauna Suite #5: Duckboard Flooring

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Blog entry by DustyMark posted 12-12-2020 05:28 AM 681 reads 0 times favorited 3 comments Add to Favorites Watch
« Part 4: Sauna Stove Guard Part 5 of Furnishing a Sauna Suite series Part 6: Top Bench Back Rest and Foot Rests »

Pretty Simple

There’s nothing fancy on this project. The objective is to walk on splinter-free cedar, as you enter and exit the sauna, instead of a cold concrete floor. I used two 3/4” thick by 2” wide by 58”long runners to support 14 floorboards that are 3/4” thick by 3 1/2” wide by 23 1/2” long. Each floorboard is attached with stainless steel screws from beneath.


I oiled all the pieces before assembly and lined them up against a straight 2 by 4. I used a piece of 1/2” cedar to establish the spacing between floorboards and a 3/4”piece to offset the runner from the edge .

I shot screws from underneath to secure one end first.

View of underside. I’m starting out with only two runners. I made a third runner that I can install later if needed. It seems that this setup flexes better with the slightly uneven concrete floor. A third runner would probably result in the whole assembly rocking a bit.

NOTE: I added the third runner to improve the support of the floorboards. The author suggested that two runners was enough for up to 24” boards, but I think it flexed too much. I planed the middle runner 3/32” thinner. That eliminated any rocking and yet provides support.

Assembled, oiled, and ready for install.


It’s coming together nicely. I only sanded to 120 grit to keep the floorboards from becoming slippery. That was a good call as confirmed during our sauna tonight. It wasn’t slippery with wet feet.


Build back and foot rests.

-- Mark, Minnesota

3 comments so far

View robscastle's profile


7875 posts in 3279 days

#1 posted 12-12-2020 06:45 AM

Looking good, Mark,

Now all we need to do is the get “the Duck ” to fly to from Hazelwood to Minnesota!

-- Regards Rob

View DustyMark's profile


508 posts in 3145 days

#2 posted 12-12-2020 03:24 PM

Thanks Rob! While I’ve been surging on my sauna project, my brother’s been chasing and shooting geese south of us in the fields towards Pine City.

-- Mark, Minnesota

View robscastle's profile


7875 posts in 3279 days

#3 posted 12-12-2020 09:20 PM

Oh goodness that may well possibly discourage the duck from coming, I think he may be lead intolerant

I bet he would enjoy your sauna though!

-- Regards Rob

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