Vertical and horizontal roll-up insect screen is a safe and long-lasting product.
The expansion in height and width by Allen screws is the strong point of this model that allows you to have guarantees on solidity and performance over time and not to ruin the window opening with drill holes and dowels. In the assembly instructions, reference is made to silicone, not to give more solidity to the insect screen, but to go to equalize and level any major defects and irregularities of the window/door. The use of silicone is recommended only after having properly checked the functioning of the insect screen, to avoid having to disassemble the whole frame if there are problems related to the mounting of the structural elements.