I am looking to add plywood flooring in my attic for storage page. There is a lot of space, very large areas. From what I've been reading, it looks to be ill-advised to add flooring if the roof was constructed with trusses instead of rafters (one such site). I have no idea what these are. Would someone be able to explain what these are and if my home has it.
Other pictures are here.
Also I am aware that I would need to extend the floor joists keep the insulation intact.