Offsetting a single surface

Hi Guys,

I have been working on a model that will form a series of 2 components that consist of a juncture component and a straight component, built up in GH and then subdivided in weaverbird. In GH I have tried to offset a surface though once I change the distance from 0 the offset fails, I have found that the only way to offset the surface is to explode which is not ideal as I require the surface to stay whole. Is there a way that I can offset the surface without needing to explode it which will still allow me to loft it in to a 3D form?

Thanks,

Kayleigh