Queen Post Trusses are considered a step up from King Post Trusses. They have two additional uprights positioned at a diagonal angle and these additions allow for extra weight allowance as well as an increase in span capacity, reaching up to 5.5 meters.
With this feasibility in mind, they are most suitable in domestic type structures such as extensions. Queen Post trusses can be supplied in both 35mm and 46mm depth of TR26 grade timber which meets with all BSEN 1995-1-1 guidelines. Similarly, to that discussed for the Kingpost Truss once the associated rafter exceeds 84mm depth. It may become more economical to supply your design in an alternative truss type such as a Fink truss and for this reason Queen Post trusses are only used in specific circumstances.
Each time a truss increases the amount of timber webs it becomes possible for that truss to withstand greater weight loading and/ or to span a greater distance.
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