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pergola built on block wall

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Mar 16, 2014, 02:03 PM
kf6cmp
pergola built on block wall
Hello. I built a u shaped block wall for a boat parking area. It is less then 3 feet high and has a 2 foot wide and 2 feet deep footing. It has re bar in footing and re bar hooked to wall and re bar in the wall tied to footing and all cells of blocks filled with concrete. I would like to build a simple pergola to the area. My question is can I put the posts on top of the above described wall? and if so what kind of hardware to attach posts to, would be strong . obviously I want a strong structure and if this is not recommended then I could build post footings on the outside of the wall in soil. This would be not as preferable because the structure would be not as clean looking. I can provide pis's if needed.
Mar 16, 2014, 02:37 PM
Jaybee
You have described what is basically a solid foundation wall - it could hold a house so there should be no problem using it as the foundation for your pergola.

Several options for attaching the posts - you could TapCon a solid pressure treated sill along the entire top of the block wall and attach your posts to that, or use any of the several different Simpson post anchoring systems available.


Jaybee
Mar 16, 2014, 02:39 PM
redoverfarm
Simpson Strong Tie makes a bracket to anchor the post to the wall. They are made to use "wedge bolts" to affix to the wall and then galvanized nails to the post.

Something similar to these. There are several made but this is the first one I found. A further search of the site might reveal more.

http://www.strongtie.com/produ...ors/ABA-ABU-ABW.asp#

http://www.strongtie.com/produ...edge-all/index.html#

This message has been edited. Last edited by: redoverfarm,
Mar 16, 2014, 06:13 PM
kf6cmp
that's good news. I was hoping that would be the case. Thanks for all replies, I really appreciate it.
Mar 16, 2014, 09:02 PM
kf6cmp
that's good news. I was hoping that would be the case. Thanks for all replies, I really appreciate it.
Mar 18, 2014, 10:41 PM
kf6cmp
I have a question on the posts. The length of the pergola will be 28'. Im thinking 5x5 posts. Is this right or is this overkill? And 4 posts on each side would put spacing at roughly 9 ft and 5 posts would be 7 ft. Any suggestions on this ?
Mar 19, 2014, 10:03 PM
Jaybee
I'd go with the 6x6 (actual 5-1/2" x 5-1/2"). Using 6x6 will give you the option of notching the tops to give a place to attach your headers while having them rest on a solid part of each post. You can also shape the 6x6 to make them more decorative. One way is to shave off about 1" of each corner, making them an uneven octagon.

Your span really depends on what size headers you are using. If you go with double 2x10, then 4 posts with the 9' spacing will work. If you only use double 2x8, then it would be better to use 5 posts and 7' spacing.

There are a lot of variables in this like your roof pitch and if you are in a heavy snow area.


Jaybee
Mar 20, 2014, 01:15 AM
ron45
I think the first step would be to pick a design that you like. You can also take several different features and combine them into one.

https://www.google.com/search?...=877&bih=518&dpr=0.9


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Mar 20, 2014, 03:45 PM
kf6cmp
Sounds good. I live in san diego where if we get 10 inches of rain then we feel we were in a major winter.