Nickel-gap is tongue-and-groove with a shadow line (supplier STS4). Grace and Groove-S are standard T&G. V-groove (V2E) shows a V at the joint. All of these are wall and ceiling panelling, not bench stock.

Prosaunas sells sauna vapor barrier and foil tape for the wall build. Use them where your room design calls for a vapor layer — they are linked below.

Wood is freight, not free shipping. Checkout charges the 8' piece-count table on the product.

Contiguous US: $195 under 19 pieces, then $395, $495, $695, $895, $995, $1,295. Canada is $100 more at each step. Doors and windows are $395 US / $495 Canada. Boards over 8' may need a dock — we'll follow up. Alaska, Hawaii, and remote addresses are quoted.