Domestic timber roof truss point loads

[Josha45]

I am designing a timber roof truss with raised ties to the Eurocodes and have question on combined ceiling and roof point load combinations. The Eurocode requires a 0.9 kN point load to be considered on the roof and for ceiling voids with access, is the combination of these point loads together on one raised tie truss realistic / required.

If so, the maximum bending in the rafter occurs when both point loads are near the tie / rafter connection, how close would you position the ceiling joist point load given the dimishing head room?

If combined together would the roof and ceiling point loads be considered different categories of imposed load such that psi would modify one or the other when combined?

Thanks

 

[KootK]

I don't know Euro but, rationally, I feel that it makes sense to only consider one of those point loads at a time.

I imagine that the limiting thing here is flexure in the rafter tail. And I would take the provision as attempting to provide assurance that you can support at least one point load from a workman or whatever else without compromising any particular part of the system, such as the rafter tail. And I feel that the single point load does that reasonably in keeping with the intent of the code provision.