Installation Guide

Expansion and Contraction Values
NewTechWood deck boards will experience expansion and contraction with changes in temperature.
Expansion and contraction are most significant where extreme temperature changes occur. Fastening
the deck planks according to the gapping requirements noted in the following table accommodates for
this movement.
Length (Feet)
Installation Temperature (°F)
3.3
8.0
9.2
9.8
12
12.8
13.1
16
17.8
Z
32
1/16
1/8
7/8
7/8
13/64
7/32
7/32
17/64
19/64
Gap
41
3/64
53/64
1/8
9/64
11/64
3/16
3/16
15/64
1/4
Gap
50
3/64
3/32
7/64
7/64
9/64
5/32
5/32
3/16
7/32
Gap
59
1/32
49/64
25/32
3/32
7/64
1/8
1/8
5/32
11/64
Gap
68
1/64
1/16
1/16
1/16
3/32
3/32
3/32
1/8
1/8
Gap
77
1/64
1/32
1/32
3/64
45/64
1/16
1/16
5/64
25/32
Gap
86 + Higher
1/64
1/64
1/64
1/64
1/32
1/32
1/32
1/32
1/32
Gap
Diagram 5
v20151224
If the country you are installing for cannot be found in the above tables a manual
calculation can be done:
What you will need to know:
-Coefficient of Linear Expansion (CLE): 20.2 x 10E-6 inch/inch/ (℉)
-Installation Temperature (℉)
-Max or Minimum Temperature in your region (℉)
a. When installing at a low temperature always use the maximum temperature in your region to calculate
b. When installing at a high temperature always use the minimum temperature in your region to calculate
-Length of the Board (inches)
Gapping = Coefficient of Linear Expansion (CLE, ℉) x Length of the Board (inches) x (Max. or Min. Temp. in your
region - Installation Temp., ℉)
Note: If you are still unsure of what gapping to use contact the manufacturer and they will give you the
correct gapping requirements based on your environment and area.