DIY Circular Substructures

Defining Characteristics:

Your substructure and platform can be one in the same or can take the shape of two separate constructs. Over the years, we have seen multiple iterations of this but they all have 3 things in common:

• They are at least 10” off the ground
• They are level
• They have rim boards in place

If you build a circular platform and substructure and plan to lay decking over top, it is advised to space your joists the same distance apart as a square deck (12”-16” on  centre). This will allow for decking without the need for additional support.

In the past, we have had customers make their substructure into a deck and use that as their platform. This does make it more difficult to install a rim and decreases your floors insulation capacity. This is a better option for warmer climates. You can screw your rim boards directly to the decking, or support them through the use of L brackets.

The easiest way to build a circular substructure is to measure and cut your centre beam to the same length as the diameter of your yurt. You can create a compass by securing a rope the length of the radius to the centre of the beam. This is a good way to check the joists as you build your structure. Please note, the joists depicted in the plans are spaced 4’ apart on centre and are only compatible with SIP Panels. 

We provide plans for circular substructures compatible with SIP Panels 'here’.

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