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Lumberock Mineral Plastic Composite (MPC) Lumber
Decking Installation Guidelines

Lumberock

Lumberock

Lumberock

Please Note that Lumberock Premium Decking claims no liability or responsibility for the improper installation our their product. All installations are unique and it is the sole responsibility of the installer to determine specific requirements in regard to each application. It is recommended that all designs be reviewed by a licensed architect, engineer or local building official before installation.

Framing and Joist Span

The frame of a deck is its primary support structure consisting of posts, beams and joists. Follow these deck framing guidelines before installing Lumberock. All joists must be level and structurally sound for new and existing deck frames.

Lumberock

Use the following table to determine the appropriate joist span for your residential or commercial project. Deck boards may be placed perpendicular to the joist or placed diagonally on the joist. Remember to install Lumberock board with the wood grain pattern facing up.

Maximum Joist Framing Span On-Centers
 
RESIDENTIAL
COMMERCIAL
 
90° Perpendicular
45° Diagonal
90° Perpendicular
45° Diagonal
5/4x6 Boards
16"
12"
12"
12"
2x6 Boards
24"
16"
16"
16"

Joist framing span applies to Standard, Groove & Groove and Tongue & Groove profiles.

Gapping and Thermal Expansion

Lumberock boards are gapped end-to-end, end-to-trim or end-to-house based on their location within your project. Proper gapping is necessary to accomodate a small amount of thermal expansion that is common to all plastic lumber materials. Lumberock boards do not need to be gapped side-to-side. The amount of expansion/contraction that occurs will depend on the length and temperature of the boards at the time of installation. The most significant changes in the length of the board will occur when you are working in extreme temperatures. High altitudes will also increase estimated expansion numbers.

Lumberock

You can expect that a 12' board installed at 60° will expand 1/8" on each end of the board. Therefore, an end-to-trim or end-to house gap will be 1/8", while two boards placed end-to-end will require a 1/4" gap. Keep in mind that boards kept in direct sunlight will be warmer than boards stacked underneath. This chart based on climates where maximum temperature is 100° F. To account for end-to-end expansion, simply double these gap values.
Estimated End-to-Trim Expansion

Installed Temperature
 
0
20
40
60
80
100
Lgth
End Gap to Leave for Expansion in inches
6'
0.17
0.14
0.10
0.07
0.03
0.00
8'
0.23
0.18
0.14
0.09
0.05
0.00
12'
0.34
0.27
0.20
0.14
0.07
0.00
16'
0.45
0.36
0.27
0.18
0.09
0.00

Decimal Conversion
1/8"
0.13
3/16"
0.19
1/4"
0.25
5/16"
0.31
3/8"
0.38
7/16"
0.44
9/16"
0.56
11/16"
0.59

Fastening Options

Lumberock can be installed using a face fastening system or a hidden fastening system. No pre-drilling is necessary to install Lumberock recycled plastic lumber, and several color-matched screw options are available. Two screws are needed per joist board. For joist spans of 16" on-center, 4.5 screws per square foot are needed. For joist spans of 24" on-center, 3 screws per square foot are needed. This figure does not include trim or railing screws.

Screws that are face fastened are drilled directly down from the deck surface into the wood framing underneath. Stainless Steel or flat head composite screws (#8 or #10)are recommended as they do not leave any material above the surface of the deck. Smaller size deck screws are not recommended. Face fastening is the best choice for wind and/or water up-lift applications.

A hidden fastening system attaches the board to the frame without leaving any marks on the surface of the deck boards. Hidden fasteners are recommended for boards over 16' in length to allow the boards to expand and contract with annual temperature changes. Groove and groove profiles are required for hidden fastening systems.

Lumberock

Lumberock Decking

 

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