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18 votes

How do I install this knee brace to my pergola post?

Prior to drilling the "through-hole", mark the location on both sides and use a paddle-style wood boring bit slightly larger than the O.D. of your flat washer, to make a large flat-bottomed hole. ...
Jimmy Fix-it's user avatar
  • 35.3k
8 votes

How do I install this knee brace to my pergola post?

And another option would be to use a beveled washer. I would use a dado for all of the joints in all of the answers just to avoid slippage strain on the bolt/wood interface.
Arluin's user avatar
  • 1,015
5 votes

How do I install this knee brace to my pergola post?

The simplest way is to recess the washer and nut into the angled brace. Using a spade bit slightly larger than the washer Mark where you want the hole. Start a hole in the right side face of the ...
bib's user avatar
  • 33.7k
5 votes

Is a ledger board required if the side of my house is wood?

Wood siding on a house is there for weather protection and looks, it has little structural strength. The ledger board is used to connect the patio cover beams to the internal structural members of the ...
JRaef's user avatar
  • 14.9k
5 votes

Can pressure treated wood be buried in concrete?

"Pressure treated wood" isn't one thing. It's many things. Some is rated for ground contact or below grade use. Most isn't. You'd need lumber that is. You won't keep it from getting wet ...
isherwood's user avatar
  • 135k
4 votes

How do I install this knee brace to my pergola post?

Minor variation to recessed holes, if you don't have or don't want to buy a spade or Forstner bit: cut a flat face into the angled support. Ensure that you leave at least 50% of the width of the ...
Arluin's user avatar
  • 1,015
4 votes

Mount pergola post at an angle

At the ground, you're mostly concerned with keeping the posts located. You don't want bumps to slide them around. A simple steel pin or bolt in the concrete is adequate. If you like, use a short stack ...
isherwood's user avatar
  • 135k
3 votes

Adding a pergola to an existing deck?

First answer! (On an old question.) Could the side beams that run perpendicular to the house extend almost all the way to the house? That would provide an additional 3.5-4’ of coverage along the house ...
Kennzenn's user avatar
3 votes
Accepted

What kind of board can span 16 ft for a wall pergola

Here is the answer to my actual question: http://awc.org/codes-standards/calculators-software/spancalc Edit: Sorry if I'm not on the same wavelengths as anyone else. I already know about insurance ...
Dave's user avatar
  • 501
3 votes
Accepted

How to attach replacement beams to column when repairing pergola

Try Simpson's Outdoor Accents Product Line. Catalog here
Ack's user avatar
  • 5,719
3 votes

How can I reduce flex/sway in my pergola?

Triangles are stable, squares are not. Finish the knee braces. You might be able to make them more simply by making them from narrower material that will fit between the beam members as they are (ie, ...
Ecnerwal's user avatar
  • 210k
3 votes
Accepted

Is it a problem that my post bases overhang the footing edge slightly?

If I understand correctly that the post bases overhang the sides of the concrete piers slightly, it's not an issue. As you said, 6x6 posts are unnecessarily large for the load, so as long as you have ...
isherwood's user avatar
  • 135k
3 votes

Any way to salvage this Wayfair gazebo roof?

Hollow plastic similar in cross section to cardboard sounds like Coroplast™, also known as corrugated plastic. Images from linked site: I've used 4x8 sheets of the stuff as the foundation for ...
fred_dot_u's user avatar
  • 10.8k
3 votes
Accepted

Anchoring aluminum pergola to 4" slab

You need to drill at least 1/2" deeper than the screw. Concrete debris accumulates in the hole quickly and would prevent full penetration of the screw. All that's in the instructions, though: ...
isherwood's user avatar
  • 135k
2 votes

Mount pergola post at an angle

The top could be a traditional mortise and tenon joint (possibly haunched for resistance to twist). You'd want the tenon to be pushed to the interior in any case, as the end grain on the joist is weak....
Aloysius Defenestrate's user avatar
2 votes

How wide does a 6x6 concrete post footing need to be using an elevated post base anchor?

Well...I had to live and learn. I used 12 inch sonotubes with the same anchor and cheap cement (the fence post kind that was recommended to me) and 6 x6 posts, which turned out to be a bad idea. 2 of ...
Amymboxer's user avatar
2 votes

Can I use LVL 2x4 outdoors (pergola roof)

I think one would use redwood or cedar for a pergola exposed to the weather.
Jim Stewart's user avatar
  • 21.6k
2 votes

Can I use LVL 2x4 outdoors (pergola roof)

The problem isn't that there's anything wrong with PT 2x4s. The problem is that you're spanning 10 feet with, presumably, no support or bracing. A 2x6 is much more appropriate for what you're doing. ...
isherwood's user avatar
  • 135k
2 votes
Accepted

Can a 2x6 beam span 11ft?

You can use the Sagulator. Putting in some quick numbers for Ponderosa Pine, I found a single 2x6 on edge to be acceptable for an 11' span holding up to ~1000 pounds total. Laminating 2 or 3 together ...
mmathis's user avatar
  • 8,853
2 votes

I dug holes for my pergola too wide

Not to big of a concern. You could take a 12" sono tube, slice it length wise and then pull it open enough to get it around the post. Then just overlap the slice and glue it with outdoor ...
Alaska Man's user avatar
  • 13.5k
2 votes

Are fence posts sturdy enough to support an addition of a wooden cover?

Vernacular architecture - what's the worst that could happen? Build it and see if it fails. If it fails, build it again stronger. Seems unlikley to kill anybody or ruin your house if failure ...
Ecnerwal's user avatar
  • 210k
2 votes

Is my pergola post a shearing and stability concern?

What you're trying to do appears possible, with a few extra parts. See here (forgive the crappy art, I made several edits): The two red rectangles are the beam-post braces I would add (minimally) to ...
Olivier's user avatar
  • 1,220
2 votes

Is it normal for a freestanding pergola to wobble a little bit?

I think you've got several issues: I don't think that the single screw holding each end of the bracing in place is sufficient. You might consider adding a 2nd screw at each end of each diagonal ...
FreeMan's user avatar
  • 47k
2 votes

What size knee braces should I install on my Pergola?

That's a beautiful pergola, and to preserve its style I would use the same timbers as you used for your posts. I'd make the vertical and horizontal legs of the triangle 1/3 of the post height, unless ...
isherwood's user avatar
  • 135k
2 votes

Anchoring floating deck and pergola

I suppose you could do what you're describing; but, my years of building deck and fence in college tells me it's a bad idea. Even with rock and shale (and no topsoil) wood resting on the ground picks ...
Edwin Buck's user avatar
  • 2,213
2 votes

Aligning pergola rafters to the sun?

A much simpler solution: Build your pergola with rafters that are aligned in the most aesthetically pleasing manner to you (this is a personal preference and none of us can answer that for you). Then, ...
FreeMan's user avatar
  • 47k
2 votes
Accepted

Attaching Pergola posts to lumber on ground

You say you get winds up to 60 MPH but you don't see a need to have a tall structure anchored in concrete? Sure, most wind will likely whistle right through an open(ish) pergola, but all it takes is ...
FreeMan's user avatar
  • 47k
2 votes
Accepted

Joining 2x4 to 4x4 base: angles or regular wood screws?

I would put cup head bolts all the way through with washers and nuts on the back. 1/4" is plenty fat enough. Four bolts per post.
Jasen's user avatar
  • 20.6k
2 votes

How can I build a pavilion without knee braces?

Thanks for posting a picture of our Caribbean pavilion. We achieve proper sheer strength, not from any attached chimney (the one pictured was not attached), but by using massive 16" tall steel ...
Jason's user avatar
  • 21
2 votes

How do I get my deck to drain into the gutter instead of dripping?

I think a drip edge will work (see red part of photo). A short piece of aluminum bent towards the opening of the gutter should cause any water to drip off of it instead of dripping the other direction....
Platinum Goose's user avatar

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