Diagrams reciprocal frame .jpg

When 4 bamboo poles are overlapped in turn and lashed together the result is a self-supporting structure called a reciprocal frame 

Diagrams reciprocal frame .jpg

This reciprocal frame is lashed on top of four outer poles to make the complete RSK roof frame

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Every RSK shelter uses this reciprocal frame for its roof because of its efficiency of span  and ability to support  loading.