Shiplap rough sawn cedar, but we used two different sizes with a pattern, and a grey-ish stain to make it look reclaimed.

Do you know the manufacturer/brand of stain you used? The specific color or was it custom? Beautiful home!

It was Sikken stain - clear. Thank you!

with a light grey tint

For anyone curious as to the floorplan, I found it! http://www.eplans.com/house-plans/epl/hwepl78064.html