Lumberock - Marine Grade Decking

4 x 4 Composite

Composite Lumber 4 x 4

Color Options

Product Description

Composite 4×4 posts manufactured with a proprietary mineral fill technology. Because Lumberock is made with a non-organic mineral fill technology, our 4×4 boards are impervious to moisture and resistant to rot and bacteria.  

Choose from 12 vibrant designer colors that will maintain their color for decades with our UV resistant color formula. All 4×4 boards come with our limited lifetime warranty. 

4x4 Board Specifications


Order Custom 4x4 Posts

Custom lengths of our beyond composite lumber 4×4 can be purchased with a minimum order of 1,000 feet or more.

The leading composite lumber 4x4 boards