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Circular Pergolas

Constructing A Pergola / June 28, 2018

Hi Friends! We finished a MAJOR project today… and do you really think we’re going to wait until Monday to share it?


So welcome to this random Sunday edition of Reality Daydream.

Important info on building your own custom pergola... including ROUND pergolas!! {Sawdust and Embryos}

Nick and I have ALL KINDS of lofty plans for our home and land… most of which are just dreams. But I like to dream with my rendering markers, so I drew up a little ‘someday’ aerial image of our property (this is only 2 of the 5 acres).

And this is where I hand things over to Nick (brains AND brawn of this particular operation).


Hey Peeps, Gents, Germs, or whatever the heck you all call ourselves these days! This is Nick and I’m excited to tell you about our latest construction endeavor! About 3 weeks ago, I had a mind to build a wooden thingy off our porch. So I got to it envisioning and designing our very own pergola.

We’ve been doing a lot of focusing in the these past couple years, and while we don’t hate the EXterior, it could definitely use some love.

Before we get too far along in this adventure, I want to share with you my design style. You may have notice from some of my previous projects that I like to add a little curviness to my designs (like the , and the . If you were to toss Grant Woods, Downton Abbey and Zaha Hadid in a blender, hit puree for 15 min… I would be the slush that comes out…

We began laying out my plan and started calculating cost and materials. With as much information as there is online these days, there shouldn’t be any reason not to have a near complete construction supplies list and calculated cost. I say near complete, because well there are always surprises. First we marked out our dig site with a can of white spray paint. I really like to use curves and circles in my design and can’t say as though I have ever seen a rounded pergola before. We tied a piece of nylon cord to the center post and then started spraying the spray paint where we wanted the radius.

Note: It is important that you ‘call before you dig’ so the utility companies can come out and mark there utilities. You don’t want any unnecessary expenses. They will only mark up to the utilities meter. The rest is considered privately owned. Their phone number is 811.

Next, we used a nylon string and stakes to square up the one side of the pergola. I tied one end to this horizontal stake (making it adjustable).

The other end we’ll be put around a nail and tightened. In order to do that, wrap the string around your finger and rotate your hand around to create ten or so twists in the cord. Place the loop around the nail and pull tight. It is easier to do this if your pushing with one hand and pulling with the other. Than pull the loose string back. Doing this will keep the string taught while you finish laying out you project.

Using Pythagoras theorem a2 + b2 = c2, measure out from the corner in one direction (a2) and mark that spot. Then measure out in the other direction (b2) and mark that spot. Lastly, measure between the two points marked forming a triangle (c2). I would measure out at least 2/3 the length to ensure that things are square. is a calculator to help.

Time to BREAK GROUND! Two of the four posts will be installed into our existing concrete patio, but the other two need concrete of their own. We marked where my posts needed to be and started digging. Here in Iowa we have a 3’ frost line and some pretty substantial winds. We need to get my post anchored below that point. Once I got my holes dug deep enough, I got the tubes in place and mixed up some concrete (directions on bag) and filled the tubes up 2-3” above the grass line.

Now that the post locations are laid out, we can drill a 1/2 in hole in our existing concrete at the center of the post locations using a mason drill bit and a hammer drill. Tap the anchor bolt into the hole and mount the 4×4 brackets into place.

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Beth held the 4×4 into place with a level as I installed the temporary braces and nailed the bracket to the 4×4.

We then put up the beams and cross members. I doubled up 2×6’s for the shorter spans and used these 2 monstrous 2×10’s for the large span, since it would be carrying the bulk of the load. I screwed a board to the 4×4’s below where I wanted to beam to be to help hold things into place while I installed the beams.

Some of our beams are required to be at an angle. The best way to measure the angle is by setting the board in place and using a straight edge to mark the angle on the board.

Once the angle is found you can use a angle finder to measure and set the angle on your miter saw.

After measuring out and marking our rafters we started installing them. Unfortunately not all of the rafters would not span the entire distance of our pergola so we created a splice point at the center beam.

We toe-nailed each rafter to the beams.

After heaving the 16’ 2×6’s up into place, it was time to mark each board to be cut to form the curvy/circular shape of our design. Using the spray-painted grass marker, Beth placed an 18” board out from the spray painted radius on the grass, and I dangled a chalk line until it was exactly at the other end of the 18” board. This gave me an exact point on each pergola slat to mark with a pencil and cut to size.