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Hardscaping Series Part 3:  Butts and Joints (This is Still a Family Site, Get your Head Out of the Gutter!!)

10/12/2012

1 Comment

 
As my hardscaping series continues, I promised last week that I would touch on the topic of “butt” joints, or “near-zero” joint widths, so here goes…

As contractors we have to be somewhat well-versed in math, whether we like it or not.  Thankfully I always did reasonably well in my math classes throughout high school and college, particularly geometry.  So I’d like to take the opportunity this week to get my Pythagoras on, so to speak.

Don’t be scared.  The lesson really pertains more to flagstone installation techniques than anything else, and if you follow along you’ll realize it’s really more basic arithmetic than anything else.

Lets start by briefly going over the available dimensions of pre-cut flagstones.  Most suppliers sell their flagstone in intervals of 6”, starting with 12”.  So that would be 12”, 18”, 24”, … etc.  Simple enough so far, eh?

This allows for the stones to be laid out in a linear pattern with the joints matching up – two 12’s equal a 24.  An 18 plus a 12 equals a 30, etc.  Notice in the below illustration how the various dimensions allow for a tight uniform installation.

Now lets take a moment to think about how flagstone it typically laid out.  In most cases, certainly not all though, as the stones are laid they include a ½” mortar joint.  Still with me?

Most suppliers recognize that the installation will want to include a consistent joint width, therefore they sell their flagstones pre-cut to allow for the joint width.  In otherwords, the 18” dimension actually measures 17 ½”, the 30” dimension at 29 ½”, etc.  Add in the ½” mortar joint and we’re right back to where we were with the layout.

But hold on, you may be saying.  “That dryset installation that we were interested in doesn’t include mortar joints. What then?  Do we still need the ½” gaps between the stones?  Are the stones available in true dimensions without the ½” allowances?”

First, yes, I have seen the stones available in the true dimensions.  But not commonly.  You’re going to have to do some searching and it most likely will take some time to find, and possibly some additional special order costs.
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Our Four-Stone "Segment"
But you can still lay the stones without leaving any gaps, even if they are pre-cut a half-inch shy. It just takes a little thought and planning.

The key is to think in segments, or units.  Lets say we’re doing a 324 square foot patio, measuring 18’ x 18’.  For this lesson we’ll keep things simple, so lets focus on one small section – say we have 4 stones – two 18” x 30” (actually 17.5’ x 29.5), and two 18 x 24 (17.5 x 23.5).  Even with the half-inch allowances, we can line these stones up to make a tight rectangle measuring one inch shy of 3’ x 4.5’ (see adjacent diagram), or approximately 13.5 square feet.

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Segments Repeat Themselves to Create a Patio
Now lets take that same 13.5 square foot pattern and repeat it, 6 times across by four times down. Voila!  There’s our 18 x 18 patio (minus a few inches) with no allowances for joint widths utilizing the half-inch shy dimensional stone.

Now any experienced mason or hardscaper will tell you its always a good idea to break up your joints. You don’t want continuous seams running the full width of your patio.  Unfortunately with this method you will need to have some continuous seams running in one direction – it’s just the nature of the math.  But if you orientate the seams in a direction that will draw you to something else, or stretch out the space, you can actually use those seams to your advantage.

So now that you’ve got the basics of “thinking in segments”, start playing around a bit.  Maybe you can come up with a larger 6 or 8-stone pattern that can be repeated without continuous joints.

Experiment, and have some fun.  And if lugging large stones around to play with math dimensions isn’t your idea of a good time, you can always play around on paper first.  Or I know a really good hardscaping contractor you can call.  

1 Comment
Matt link
10/18/2012 07:00:16 am

Good explanation Clark....I never really thought of it like a math problem but it really is. I for one don't mind seeing sectioned off segments of patterns because they have architectural appeal. Something in flat work that drives me crazy is when there are four corners. When that is done it appears like a mistake to me and is disruptive to the pattern of a patio.

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    Clark Kent Creations, LLC is a full-service landscape construction company servicing the Pennsylvania communities of Delaware County, Chester County, The Main Line, and the University City, Art Museum, and Manayunk/Roxborough neighborhoods of Philadelphia.  In addition to this blog page, additional information regarding the company and our services can be found on the subsequent pages of the site.
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    Clark Linderman is the president of Clark Kent Creations, LLC, a landscape construction company based in Swarthmore, PA.  He is a proud graduate of the University of Michigan.  In addition to his passion for all things outdoors, he counts Michigan football, Phillies baseball, Superman memorabilia, Memphis R&B music, and good craft brews among his many interests.  He currently resides in Swarthmore with his wife, Sheila, two sons, his dog Krypto, and a really, really messy garage full of work supplies and toys.

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    Swarthmore, PA
    Design and Construction to Maximize Your Outdoor Experience

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