Can you drill deck screws through these boards into the joists or should you use a fastener? We're using for steps on a porch.

Yes, you can screw through the surface of the boards to secure the boards. I have attached a link that will take you to our installation guide and you can note on page 11 we have listed the recommended composite deck screws and which line of decking they are compatible with for this application. https://online.flippingbook.com/view/63974767/ Trex Customer Care Team