When the boards expand the iJack keeps the integrity of the spacing, so the gap will not close. Both boards will move along the plane together. Because all iDecking fitting systems are shaped like runners, the boards can slide along within these fitting without any risk of coming out, so no more screws bursting out. The boards will move back to their original positions as they contract.
Installers need only to ensure that there is sufficient space at the edges of the decking to handle thermal expansion. Click here for a video demonstration of how iJack works.