Support structure for supporting foamable material on hollow structural member

A support structure for supporting a foamable material in a cavity extending in a longitudinal direction in a hollow structural member of known transverse cross-section, comprising:

• a support member comprising at least one wall having opposed surfaces and a shape corresponding to the known transverse cross-section, and adapted for placement transversely across the cavity with the at least one wall perpendicular to the longitudinal direction, said support member comprising at least one support strip projecting from at least one of said opposed surfaces in a longitudinal direction, and
• an engagement pin integrally provided on said support member and adapted to engage an aperture formed in the hollow structural member,
• said at least one wall substantially blocking expansion of foamable material received therealong in a longitudinal direction, and permitting expansion in a transverse direction such that the foamable material transversely blocks the hollow structural member when it is foamed by external heating, the foamable material forming at least one slot engaging said at least one support strip therein, and having a side surface engaged against at least one of said opposed surfaces.