Pergola project,, need check on engineering.

[zonzin]

Great forum,, very happy I found it as there seem to be a lot of very knowledgeable folks here. On to my questions.
I am currently in the process of building a free standing pergola over my patio and am about to order lumber (redwood) but want to double check my specs for the lumber order.
The pergola will be built with the post (X) spacing as follows:

13'6" and 12' as below.

X ------------ 13'6"-----------X
|-----------------------------|
|-----------------------------|
|-----------------------------|
|-----------------------------|
|-----------------------------|
|-----------------------------|
12'---------------------------12'
|-----------------------------|
|-----------------------------|
|-----------------------------|
X-------------13'6"-----------X

The posts will be 6"x6" redwood
The lath will be 2"x2" redwood spaced at 3" oc.
The joists will be spaced 24" oc.

1.On the beams, can I use double 2"x10" redwood (rough)sandwiching the posts to span the 13'6" with a 3' cantilever on each end?

2.For the joists, can I use 2"x6" to span the 12' between beams or do I need to go to 2"x8"? The Joists will cantilever 3' only on the end away from the house.

Thanks in advance for you feedback!!

 

[Egon]

Welcome.

For the sandwiched beams will they be full length? How will you fasten them to the posts.

On the Joists is it assumed they will set on top of the beams?

Have you checked at your lumber yard for beam and joist span/loading and size?

 

[framer]

Looks good to me.Lag or bolt 2x10 to 6x6.Put a two spacers in 2x10 beam
screw or lag will keep beam from twisting.19.2 centers on 2x6 would make
it saver when you instal lattice on top.But 2x6 on 2'centers will work.

 

[CurlyDave]

What is load per square foot you must design to?

I have no idea for the regulations for pergolas, but the structure has to be able to support something. There is no real answer until this criteria is known.

 

[flusher]

Great forum,, very happy I found it as there seem to be a lot of very knowledgeable folks here. On to my questions.
I am currently in the process of building a free standing pergola over my patio and am about to order lumber (redwood) but want to double check my specs for the lumber order.
The pergola will be built with the post (X) spacing as follows:

13'6" and 12' as below.

X ------------ 13'6"-----------X
|-----------------------------|
|-----------------------------|
|-----------------------------|
|-----------------------------|
|-----------------------------|
|-----------------------------|
12'---------------------------12'
|-----------------------------|
|-----------------------------|
|-----------------------------|
X-------------13'6"-----------X

The posts will be 6"x6" redwood
The lath will be 2"x2" redwood spaced at 3" oc.
The joists will be spaced 24" oc.

1.On the beams, can I use double 2"x10" redwood (rough)sandwiching the posts to span the 13'6" with a 3' cantilever on each end?

2.For the joists, can I use 2"x6" to span the 12' between beams or do I need to go to 2"x8"? The Joists will cantilever 3' only on the end away from the house.

Thanks in advance for you feedback!!

Here's the 20x20 ft pergola I built 4 years ago to shade the patio.









4x4 redwood posts
Doubled 2x6 redwood beams
2x4 DF lath stained redwood color
Simpson post bases
1/2" dia bolts/nuts
1/2" lag screws in the knees

Good luck with your pergola

 

[Pops15]

2X6's should be fine. Redwood is very light. If you were building with pressure treated you'd probably need to go with 2X8's.
Don't forget to add some diagonal bracing from the posts to the beams. Also add diagonal braces from the posts to the end joists.

 

[zonzin]

Thanks everyone for the great feedback!!

I will be using 1/2' bolts, 3 per, for the 2"10" beams with diaginal bracing using 6"x6" for brace material.

The End joists will also sandwitch the posts using 1/2" bolts, 2 per with the remaining joists screwed and hurricane clipped.

The lath will be screwed with 3" deck screws.

In our area there are no load issues, doent snow here so the only load is the lath.


So it sound like I am good to go unless anyone see a problem in the details.:thumbsup:



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