Doubled tiebeams combines normal and reversed assembly, with one tiebeam above and one below the clasped wall plate.
see also Base Cruck
A*) Applied jetty B*) End jetty C) Storeyed construction
c*) Storey post e) Passing braces f) clasped wall plate held by g) Doubled tiebeam h) Short knee principal i) Head plate j*) Jetty spur