I have done a fair bit with dry stack and want to give building a shed a try. I have a good supply of basalt stone of about the right size. When I look online for advice on mortar, the UK sites all say use only lime in the mix, and the US sites say either 1:1:6 or 1:2:9. So, with this conflicting advice, I am kind of stuck. Any ideas would help!
Ideally, you'd want to know the approximate compressive strength of the stone you're using, which can often be found by contacting a local veneer stone supplier. Then, you'll want to choose a mortar with a compressive strength slightly lower. For example, most Type S mortars will achieve around 2500 psi in strength, and our the choice for most local stone veneers HERE. A Type S mortar can be simply produced at about a 1:1:6-8.