Monday, April 30, 2012

Louvered Trellis

My parents decided they wanted a little more privacy in their backyard so my step-dad and I started work on a louvered privacy trellis to top the fence we built last year.  Each louver is held in place from above by a spacer board that is mounted between the 2x6 beams.  On the bottom they ride along a strip of 1x2 and are held in place by a single brad.

I was against using the blue stain, but it turned out pretty cool.  We still need to add some crossbars up top, but otherwise it is done.  Here's some pics of the construction and the result.

 

Most of the compound angle calculators on the internet are pretty terrible at describing which angle is which and where they're measured from.  I ended up just calculating them myself.  We ended up ignoring the Secondary angle; it was something around 80° for the steepest sections, not a signification deviation from 90° over the 1/2" thickness of the louvers.  Plus it can't hurt to let them breath a bit, I suspect we'll have problems with some of the more enclosed bits rotting within a few years.  Here's a diagram showing the relevant angles in this situation and how to calculate the Primary and Secondary angles that need to be cut in order for the louver to sit flush with the fence.

Figure 1: Compound Angles.  F is the angle the fence section inclines with respect to level.  L is the  angle of the louver measured from flush with the face of the fence.  P and S are the angles that need to be cut on the corresponding axes of the louver.