Our six-string guitars are all strung with D'Addario EXP16 strings. They're a light gauge (12s) phosphor bronze coated string set.
The Algonquin 12 is strung with D'Addario EJ38 light gauge (10-47) phosphor bronze strings.
Most of our guitars can handle slightly heavier gauge strings but the nut may have to be re-filed to widen some of the slots. Changing string gauge can also have an effect on the neck relief which could necessitate a slight turn of the truss rod.
If you decide to add medium gauge strings to the Algonquin 12 we recommend tuning it down a tone and evaluate how the top of the guitar responds over a few weeks before tuning up to standard pitch.