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Old 08-04-2012, 09:37 PM   #1
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Pergola Rafter Tails


Getting ready to start a free standing pergola, 16 X 20. Based on layout of existing deck I am using four 6 X 6 post. I will sandwich the posts with 2 X 12 X 20 on the long span which will have approx 16' between the posts, and 2 X 10 X 16 for the shorter span which will have approx 12' between the posts. The rafters will be 2 X 10 X 16 and will be spaced 24" o.c. Based on the final placement of the posts, I will have up to 4' of tail on each rafter, which I want to keep. Not sure of the exact finish on each tail but will be simple and probably like to sketch (not to scale). I can add a 2 X 4 on top to stabilize, but will 4' be too long?


Thanks - Matt
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Old 08-04-2012, 09:51 PM   #2
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Material will be #2 PT.

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Old 08-05-2012, 03:01 AM   #3
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Pergola Rafter Tails


When you say 'will 4ft be too long', do you mean visually (ie from the aesthetic standpoint) or structurally (ie might it bend too much etc)?
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Old 08-05-2012, 08:54 AM   #4
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Pergola Rafter Tails


Quote:
Originally Posted by tony.g View Post
When you say 'will 4ft be too long', do you mean visually (ie from the aesthetic standpoint) or structurally (ie might it bend too much etc)?

Structurally
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Old 08-05-2012, 09:46 AM   #5
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Pergola Rafter Tails


Since there's 0 down load and there 2 X 10's it should be fine.
2' would be safer thorugh.

I also would not just bolt those cross members to the outsides of the 6 X 6's.
I would cut into the 6 X 6, 3" on one side, then double bolt them.
It also is a better look if you use a paddle or a forister bit to countersink the bolt head and the washer and nut in the 2X's.
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Old 08-06-2012, 07:08 AM   #6
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I thought about doing that but like the look when they are apart. I figured that since I will have minimal load I should be okay without the notch. I was also cosidering the sag of each board with the given span, but again there will be minimal load and I am using 2x12 for this run. Do you suggest the notch to gain structural support at the contact point on the 6x6 post?
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Old 08-06-2012, 10:52 AM   #7
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With your light load both ways will work, I done it both ways.
It just looks less clunky with the two together on one side to me.

I also would think those tails would look better with a little curve cut into them instead of just that angle single cut.
Make a pattern, lay them out and cut them with a jig saw then clean them up with the end of a belt sander.
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Old 08-31-2012, 07:24 AM   #8
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Still working on the pergola. Mother Nature has been uncopperative the past two weekends, but the next few days look great. I plan to stain the rafters Saturday and then assemble on Sunday. I will add a pic once it is complete.
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Old 08-31-2012, 02:03 PM   #9
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The plans look nice! I'll look for the pictures once they're up.

I designed plans to build a pergola over my patio for next spring. It's slightly smaller though at about 12x16. They look really nice and in my case will provide shade in an area that gets none.
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Old 08-31-2012, 02:34 PM   #10
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are you planning on any lateral bracing at the tops of the columns for stability? if not, see this previous post .....

Pergola movement

if so, we can discuss it on here
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Old 08-31-2012, 08:37 PM   #11
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I saw that thread before I started to build. I am not sure if I will use them or not. I am okay with minimal movement, although I am not sure how to define minimal! My biggest concern with the bracing is that they will 'be in the way' and be more of a hazard waiting for someone to run into it. Due to the configuration of my deck, the 2x12 joist span the deck itself and the bottom edge is 88" off of the deck. My plan is to wee how it acts once it is fully assembled, hopefully Sunday. If the racking seems excessive, again I am not sure how to define that, I will add some bracing. If bracing needs to be added, it will be nowhere near the 4' that someone mentioned in the other thread. At best I would say 24" max, but it is too soon to tell.

In short, I hope to get away without them, but if they are needed to maintain stability and add to longevity then they will go up.
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Old 08-31-2012, 08:44 PM   #12
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if its wobbly please post back.
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Old 09-03-2012, 08:50 PM   #13
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Well, I am near completion. All I need to do now is lay a few boards on the top to tie it all together and provide a little more shade. I am concerned about the rafter tails warping so I will add a board on top of them as well. I am considering 5/4 boards for the top.

As far as the stability this unit is solid. There is vey little movement in any direction, and you have to try at that to make it move. I will probably pass on the bracing for now but will keep an eye on it as times goes on. Even if I need them they should be a fairly simple add-on. I used the the Simpson CBSQ66 base for each post. As slight as movement is, it seems to be a little more when I try to move it with the house. When I push it towards the house there is almost no movement. I am thinking this could be a result of the Simpson base, but I am not sure.

Off topic, but I did the deck last year with Certainteed Evernew LT and Tamko railing. Now I just need to break out my green thumb and make a perimeter around the entire deck.
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Old 09-05-2012, 10:44 PM   #14
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Be careful when you put up the cover. This will allow wind pressure to build up under it and uplift and movement may occur. Depending on location, maybe wind load is not a concern...nice job by the way.
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Old 09-05-2012, 11:04 PM   #15
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looks great mc!

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