Can you give us an idea of the timber sizes?
are the trimmer joists green or an existing part of the frame? the type of joinery may depend on the ability of the trimmer joists to withstand removal of material to form joints, and / or any requirement to create restraint etc in the plane of the floor.

[This message has been edited by Bill Keir (edited 02-26-2001).]

Bill

The pessimist sees difficulty in every opportunity

While

The Optimist sees Opportunity in every difficulty