ButtSpline® System

OUR PHILOSOPHY

We use the naturally occurring shrinkage of the log to our advantage with our ButtSpline® technology to make your log home air tight.

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BUTTSPLINE® ASSEMBLY

  1. Two holes are drilled in the end of each log to create a figure-eight shape as they butt together in a wall assembly.
  2. A custom made ButtSpline® clamp is inserted into pre-drilled holes and pressure is applied to draw the joint together.
  3. An asphalt-impregnated figure eight foam pad is installed at the bottom of the holes.
  4. A two-piece polypropylene  assembly is wrapped with asphalt foam tape and then dropped into the holes.
  5. Two 10-inch common spikes are driven into the two-piece assembly, wedging it apart, tightening the joint.
  6. Another asphalt-impregnated figure eight foam pad is installed on top of the assembly.
  7. The clamp is removed.
BUTTSPLINE® ASSEMBLY diagram
patents and patents pending buttspline diagram

OUR SECRET

The natural shrinkage in the width of the log (green arrows).

The log squeezes on the radius of the ButtSpline®. At the same time (shown with blue arrows) the log shrinks lengthwise, pulling on the ButtSpline® causing the joint to tighten over time.

*Systems shown and used by True North Log Homes Inc. are protected by patents and patents pending – U.S.A. and Canada.

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