PREMIUM models are available in sizes offered or custom sizes. They are manufactured using the thickest wall of 70mm (2-3/4) and offered without floors, ready to mount on a concrete slab or wood sub floor. (optional soft wood tongue & groove floors are available on request) The windows and doors are premium double glazed, double weatherstripped with heavy duty multi locking tilt/turn openers. Doors include mortised locks, deadbolts with keys. Multi room models include interior walls with solid core wood interior doors, hardware and keys. Threaded steel rods are included for wall junctions to secure walls.
Premium models can be insulated on the interior or exterior depending on the model. Single 2-3/4″ walls have a thermal mass rating of R-12 ideal for 3 season use. To meet residential building codes use upgrade insulating kits for 10% of the selling price.
Thermal mass of R-12 + R-15 insulation = R-27 minimum
Billings 70 is a single room model with a single wide entry door and single window on the front wall. The front wall can be reversed at assembly allowing the door to be on the left or right side. Insulate the roof and add a wall mounted HVAC heating/cooling system for complete comfort.
The model can be assembled in 2 days by 2 people.