Structural Plastic Boards

The Structural Plastic Lumber boards have the same attributes as described for the molded grades with one major difference. The fiberglass reinforced plywood makes the structural plastic lumber boards approximately 3 times stiffer than the molded or premium grade lumber boards. These boards are the choice when free spans beyond the capability of the other grades are required. Common uses are for under-structure in deck, dock and boardwalk construction, sign and fence posts though there are many other potential applications such as pergolas and arbors. This grade, because of the dense fiberglass additive is also the heaviest board on a size by size comparison with the other grades.

A small order fee adds an additional $35.00 to orders under $400.00 (before shipping)

Premium Grade lumber Info Page or Molded Grade Lumber Info page.

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white plastic lumber. Molded & Structural grade
White Molded & Structural Grade Plastic lumber
Tan Molded grade Plastic Lumber
Tan Molded & Structural Grade Plastic Lumber.
Cedar Molded & Structural Grade Plastic Lumber
Cedar Molded & Structural Grade Plastic Lumber
Mink Molded & Structural Grade Plastic Lumber
Mink Molded & Structural Grade Plastic Lumber.
Nor Weather Wood Molded & Structural grade plastic lumber
Weathered Wood Molded & Structural Grade Plastic Lumber.
Grey Molded & Structural Grade Plastic Lumber
Grey Molded & Structural Grade Plastic Lumber
Yellow Molded & Structural Grade Plastic Lumber
Yellow Molded & Stuctural Grade Plastic lumber.
Blue Molded & Structural Grade Plastic Lumber
Blue Molded & Structural Grade Plastic Lumber.
Red Molded & Structural Grade Plastic Lumber
Red Molded & Structural Grade Plastic Lumber
Brown Molded & Structural Grade Plastic Lumber
Brown Molded & Structural Grade Plastic Lumber.
Forrest Green Molded & Structural Grade Plastic Lumber
Forrest Green Molded & Structural Grade Plastic Lumber.
Dark Grey MOlded & Structural Plastic Lumber
Dark Grey Molded & Structural Grade Plastic Lumber.
Ind. Dark Grey Molded & Structural Grade Plastic Lumber
Ind. Dark Grey Molded & Structual Grade Plastic Lumber.
Black Molded & Structural Grade Plastic Lumber.
Black Molded & Structural Grade Plastic Lumber.

Please scroll down for more information about Sstructural Grade Plastic Lumber. Custom colors are available. May be lead time for custom color plastic lumber. Need more info?

Click  What grade do I need.

Technical Data | Structural Grade Plastic Lumber

English Units                                                                               Metric Units

TEST

ASTM TEST

VALUE

UNITS

VALUE

UNITS

Flexural Strength

D6109-97

2750

PSI

193

KG/CM²

Flexural Modulus

D6109-97

306080

PSI

15503

KG/CM²

Compression Strength

D6108-97

2340

PSI

165

KG/CM²

Compression Modulus

D6108-97

114900

PSI

8077

KG/CM²

Specific Gravity

D6111-97

0.93

G/CC

0.93

G/CC

Flash Point

644

DEG F

340

DEG C

Moisture Absorption

0.06

% by weight

0.06

% by weight

Thermal Expansion

D6341-98

0.000033

INCH/INCH/DEG F

Average Nail Pull Out

D6117-97

504

Lbs.

229

KG

Static Coefficient of Friction-Dry

D2394-83(99)

.53

Static Coefficient of Friction-Wet

D2394-83(99)

.51

Sliding Coefficient of Friction-Dry

D2394-83(99)

.23

Sliding Coefficient of Friction-Wet

D2394-83(99)

.51

Flame Spread

E84 (03a)

62

Flame Spread Classification

E84 (03a)

60

Smoke Developed

E84 (03a)

230

Smoke Developed Classification

E84 (03a)

250

Spontaneous Ignition

D-1929

824

DEG F

440

DEG C

Notes:

  • THIS DATA REPRESENTS AVERAGE VALUES NOT MINIMUMS. SAFETY FACTORS MUST BE ADDED INTO THE DESIGN.
  • Testing conducted by Battelle of Columbus, OH
  • Warnock Hershey Certified for ASTM D6662-01 by Intertek Testing Services NA Ltd. of Coquitlam,BC.
  • For further information on our ASTM standards please contact your Plastic Lumber Yard representative.
  • For further information on Intertek Testing Services NA Ltd. and the Warnock Hershey certification, please contact ITS at: www.ETLSemko.com
  • For Further information and their processes please contact ASTM at: www.astm.org

Chemical Resistance

Since high density polyethylene has a high resistance to most acids and chemicals, Plastic Lumber is not affected by exposure to most substances.

Ultraviolet Weathering

An ultraviolet stabilizer is incorporated at the time of manufacture. It protects the plastic lumber from ultraviolet light degradation and ensures that the outside of the product will not degrade in exterior applications.

STRUCTURAL GRADE PLASTIC LUMBER SPAN TABLE – JOIST MODE 120° F

16″ Center distance for joist. 78° F – Limited By Deflection

JOIST MODE

60 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.461.35.1
2×81.57.382.86.9
2×101.59.25105.08.7
2×121.511.3128.210.7
3×42.43.445.13.8
3×62.45.573.06.1
3×82.47.496.78.1
3×102.49.3120.910.1
3×122.411.3146.012.2
4×43.43.450.74.2
4×63.45.480.56.7
5×54.44.471.56.0
6×65.45.493.97.8
6×125.411.3183.815.3

DECKING MODE

60 Lbs./Sq Foot Dynamic Load 78° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12526.22.2
2 x6,8,10,121.535.02.9
3 x4,6,8,102.455.94.7
4 x4,63.479.26.6
5 x 54.4102.58.5
6 x6,125.4125.810.5

100 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.452.44.4
2×81.57.370.95.9
2×101.59.2589.87.5
2×121.511.3109.79.1
3×42.43.438.63.2
3×62.45.562.55.2
3×82.47.483.57.0
3×102.49.3104.68.7
3×122.411.3126.510.5
4×43.43.443.43.6
4×63.45.468.95.7
5×54.44.461.25.1
6×65.45.480.46.7
6×125.411.3161.513.5

100 Lbs./Sq Foot Dynamic Load 78° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12522.41.9
2 x6,8,10,121.529.92.5
3 x4,6,8,102.447.84.0
4 x4,63.467.85.6
5 x 54.487.77.3
6 x6,125.4107.69.0

150 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.446.23.8
2×81.57.362.45.2
2×101.59.2579.16.6
2×121.511.396.68.0
3×42.43.434.02.8
3×62.45.555.04.6
3×82.47.473.96.2
3×102.49.392.67.7
3×122.411.3112.29.3
4×43.43.438.23.2
4×63.45.460.65.1
5×54.44.453.84.5
6×65.45.470.75.9
6×125.411.3144.312.0

150 Lbs./Sq Foot Dynamic Load 78° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12519.71.6
2 x6,8,10,121.526.32.2
3 x4,6,8,102.442.13.5
4 x4,63.459.65.0
5 x 54.477.16.4
6 x6,125.494.77.9

200 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 78° F

Limited By Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.442.13.5
2×81.57.356.94.7
2×101.59.2572.16.0
2×121.511.388.17.3
3×42.43.431.02.6
3×62.45.550.24.2
3×82.47.467.55.6
3×102.49.384.77.1
3×122.411.3102.78.6
4×43.43.434.82.9
4×63.45.455.34.6
5×54.44.449.14.1
6×65.45.464.55.4
6×125.411.3132.611.1

200 Lbs./Sq Foot Dynamic Load 78° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12518.01.5
2 x6,8,10,121.524.02.0
3 x4,6,8,102.438.43.2
4 x4,63.454.44.5
5 x 54.470.35.9
6 x6,125.486.37.2

16″ Center distance for joist. 120° F Limited By Deflection

JOIST MODE

60 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 120° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.452.34.4
2×81.57.370.85.9
2×101.59.2589.77.5
2×121.511.3109.59.1
3×42.43.438.53.2
3×62.45.562.35.2
3×82.47.483.97.0
3×102.49.3102.38.5
3×122.411.3123.610.3
4×43.43.443.33.6
4×63.45.468.85.7
5×54.44.461.05.1
6×65.45.480.26.7
6×125.411.3155.613.0

DECKING MODE

60 Lbs./Sq Foot Dynamic Load 120° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12524.12.0
2 x6,8,10,121.532.12.7
3 x4,6,8,102.451.34.3
4 x4,63.472.76.1
5 x 54.494.17.8
6 x6,125.4115.59.6

100 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 120° F

Limited By Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.444.83.7
2×81.57.360.65.0
2×101.59.2576.76.4
2×121.511.393.77.8
3×42.43.433.02.7
3×62.45.553.44.4
3×82.47.471.66.0
3×102.49.388.57.4
3×122.411.3107.28.9
4×43.43.437.03.1
4×63.45.458.84.9
5×54.44.4525.24.4
6×65.45.468.75.7
6×125.411.3136.711.4

100 Lbs./Sq Foot Dynamic Load 120° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12520.61.7
2 x6,8,10,121.527.42.3
3 x4,6,8,102.443.93.7
4 x4,63.462.25.2
5 x 54.480.56.7
6 x6,125.498.88.2

150 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 120° F

Limited By Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.439.43.3
2×81.57.353.34.4
2×101.59.2567.55.6
2×121.511.382.56.9
3×42.43.429.02.4
3×62.45.547.03.9
3×82.47.462.55.2
3×102.49.378.46.5
3×122.411.395.07.9
4×43.43.432.62.7
4×63.45.451.84.3
5×54.44.446.03.8
6×65.45.460.45.0
6×125.411.3122.210.2

150 Lbs./Sq Foot Dynamic Load 120° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12518.11.5
2 x6,8,10,121.524.12.0
3 x4,6,8,102.438.63.2
4 x4,63.454.74.6
5 x 54.470.85.9
6 x6,125.486.97.2

200 Lbs./Sq Foot Dynamic Load. 16″ Center distance for joist. 120° F

Limited By Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.436.03.0
2×81.57.348.64.1
2×101.59.2561.65.1
2×121.511.375.36.3
3×42.43.426.52.2
3×62.45.542.83.6
3×82.47.457.64.8
3×102.49.371.76.0
3×122.411.387.07.2
4×43.43.429.72.5
4×63.45.447.23.9
5×54.44.441.93.5
6×65.45.455.14.6
6×125.411.3112.39.4

200 Lbs./Sq Foot Dynamic Load 120° F

Limited Deflection

ACTUAL SIZEMAXIMUM SPAN
SIZETHICKNESSINCHESFEET
5/4 x4,61.12516.51.4
2 x6,8,10,121.522.01.8
3 x4,6,8,102.435.22.9
4 x4,63.449.94.2
5 x 54.464.65.4
6 x6,125.479.26.6

UMBER SPAN TABLE – 78° F

24″ Center distance for joist. 78° F Limited Deflection

60 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.453.54.5
2×81.57.372.46.0
2×101.59.2591.77.6
2×121.511.3112.09.3
3×42.43.439.43.3
3×62.45.563.85.3
3×82.47.485.27.1
3×102.49.3106.68.9
3×122.411.3129.010.7
4×43.43.444.33.7
4×63.45.470.35.9
5×54.44.462.45.2
6×65.45.482.06.8
6×125.411.3164.313.7

150 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.440.33.4
2×81.57.354.54.5
2×101.59.2569.15.8
2×121.511.354.47.0
3×42.43.429.72.5
3×62.45.548.04.0
3×82.47.464.75.4
3×102.49.381.26.8
3×122.411.398.58.2
4×43.43.433.42.8
4×63.45.453.04.4
5×54.44.447.03.9
6×65.45.461.85.2
6×125.411.3127.410.6

100 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.445.83.8
2×81.57.361.95.2
2×101.59.2578.56.5
2×121.511.395.98.0
3×42.43.433.72.8
3×62.45.554.64.5
3×82.47.473.46.1
3×102.49.391.97.7
3×122.411.3111.49.3
4×43.43.437.93.2
4×63.45.460.25.0
5×54.44.453.44.5
6×65.45.470.25.9
6×125.411.3143.311.9

200 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 78° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.436.83.1
2×81.57.349.74.1
2×101.59.2563.05.3
2×121.511.377.06.4
3×42.43.427.12.3
3×62.45.543.83.7
3×82.47.459.14.9
3×102.49.374.26.2
3×122.411.390.17.5
4×43.43.430.42.5
4×63.45.448.34.0
5×54.44.442.93.6
6×65.45.456.44.7
6×125.411.3116.99.7

24″ Center distance for joist. 120° F – Limited Deflection

60 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 120° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.445.73.8
2×81.57.361.85.2
2×101.59.2578.36.5
2×121.511.395.78.0
3×42.43.433.72.8
3×62.45.554.54.5
3×82.47.472.16.0
3×102.49.390.37.5
3×122.411.3109.29.1
4×43.43.437.83.2
4×63.45.460.15.0
5×54.44.453.34.4
6×65.45.470.15.8
6×125.411.3139.211.8

100 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 120° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

table-header-ply”>SIZEWIDTHHEIGHTINCHESFEET

2×61.55.439.13.3
2×81.57.352.94.4
2×101.59.2567.05.6
2×121.511.381.96.8
3×42.43.428.82.4
3×62.45.546.63.9
3×82.47.462.15.2
3×102.49.377.86.5
3×122.411.394.37.9
4×43.43.432.42.7
4×63.45.451.44.3
5×54.44.445.63.8
6×65.45.460.05.0
6×125.411.3121.310.1

150 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 120° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.434.42.9
2×81.57.346.63.9
2×101.59.2559.04.9
2×121.511.372.16.0
3×42.43.425.42.1
3×62.45.541.03.4
3×82.47.454.84.6
3×102.49.368.85.7
3×122.411.383.47.0
4×43.43.428.52.4
4×63.45.445.23.8
5×54.44.440.23.3
6×65.45.452.84.4
6×125.411.3107.99.0

200 Lbs./Sq Foot Dynamic Load. 24″ Center distance for joist. 120° F

Limited Deflection

ACTUAL SIZE

MAXIMUM SPAN

SIZEWIDTHHEIGHTINCHESFEET
2×61.55.431.42.6
2×81.57.342.53.5
2×101.59.2553.84.5
2×121.511.365.75.5
3×42.43.423.11.9
3×62.45.537.43.1
3×82.47.450.14.2
3×102.49.362.95.2
3×122.411.376.36.4
4×43.43.426.02.2
4×63.45.441.33.4
5×54.44.436.63.1
6×65.45.448.14.0
6×125.411.399.08.2

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