Of course, you should have a sill; otherwise, you have nothing to attach the floor to. 
Read and consider:
http://www.alltombostad.se/gds/6/87/index.html
http://www.ritningar.com/uterit/gds01.htm
Read and consider:
http://www.alltombostad.se/gds/6/87/index.html
http://www.ritningar.com/uterit/gds01.htm
Check here for explanations of various terms for a house.
http://www.svenskttra.org/byggbeskrivningar/
Look under "General" and for instance "Good to know about trä" where there is a picture of a house with different designations.
http://www.svenskttra.org/byggbeskrivningar/
Look under "General" and for instance "Good to know about trä" where there is a picture of a house with different designations.
Jo ho, it's called syll on log houses too 
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