We utilize the Trex Enhance line of composite boards for applicable projects (such as outdoor furniture) to keep cost efficient and lower for our customers.

This line does have groves on the underside of the board (as seen in picture).  A more expensive line of Trex boards can be used upon request which do not have these groves, however this will be more expensive.  A free quote can be given prior to the start of your project to help make any decisions on materials.