OUR 1"x4" Board has
a small V-joint pattern. The 3/32" v joint gives a neat appearance and
allows the larger shoulder to hide nails and fasteners. The 1/4" tongue
allows fastening without splitting. Our 1"x4" board has the highest R
value, greatest heat retention, and does not require plywood backing
for added strength. Our
material is 50% to 100% vertical grain.
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COMPETITOR's 5/8"x4" Board
has a profile pattern which is common in knotty spruce European Saunas.
Boards must be undercut with grooves to help cupping and warping. This
pattern leaves a valley between boards which can not hide nails - there
is also lower R value.
Boards are almost 100% flat grain.
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COMPETITOR's 1/2"x4" Board
has a reverse v pattern (v on both sides) which creates a small 1/8"
tongue. The small shoulder will not easily hide nails or fasteners and
the tongue and shoulder can split when nailing. The thinner board has a
lower R value and natural shrinkage at the groove will allow some heat
loss. 1/2"x4" boards can be flat or wide grain with some vertical grain
and should be backed with plywood for additional strength and R value.
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