This photo shows a 10’ strip of Poly Board being bent into a full circle. Actually, you can take the end approximately 40% past a full circle without the board breaking. All bends, curves, “S” curves, etc. can be made with the Poly Board without the necessity of cutting the board. Only when executing a 90° corner or close to a 90° corner is it necessary to cut and stake.
Heat Sensitivity
Due to temperature swings in areas of extensive sunlight and heat, there is a thermal expansion that will occur with the Poly-Board product. The following information relates to the thermal expansion and installation of the Poly Board product.
After sitting the sunlight on a 85 degree day, the Dark Brown Poly Board (PB6-20) reached 149 F and grew 1-1/2” in length – over a 84 degree temperature change.
After sitting in the sunlight on a 85 degree day, the Light Brown PB6-20 Poly Board reached 155 degrees F and grew 1-3/8” in length – over a 90 degree temperature change.
Joint Meld and Stake Installation
Thermal expansion and contraction over may cause a lateral movement of the board in the soil. This may give the appearance the board is shrinking or expanding excessively. To minimize this movement, the boards should be securely anchored with stakes. The installation information indicates how to allow for the expansion and contraction of the Poly Board during the cool and hot seasons of the year.
If the boards feel hot to the touch (100°+), the boards should be installed with little or no gap in the slip joint.
If the boards feel warm to the touch (40° – 90°), the boards should be installed with about half of the joint apart.
Note:
Screws or bolts should never be utilized in the joints as this causes the joint to bind to buck up.
If the boards feel cool or cold to the touch (0° - 40°), the ends of the joint should just overlap to allow for thermal expansion.
Made in the U.S.A.