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Discussion Starter · #1 ·
Hello,

I posted here a good while ago regarding pouring a foundation slab to build a wood fired oven.

Well, meanwhile I've been busy building the oven itself. It's been fun.
Now that the oven is almost done, I want to make a small pergola style single pitch roof structure to protect the oven from wind and weather. Single pitch to make it easy to get the oven chimney through the roof. Gable flashing is super expensive around here and I haven't much experience with masonry, although I built a deck last year.

I'm sharing the very basic attached pictures of the oven and my idea for roof.

I have some repurposed 4 by 4 posts which I want to fasten to the base slab. Higher in front than in back so water can drain off the roof. My idea is to cut half of the 4 by 4 off up to, maybe 10-12 inches, then put that notch over the edge of the slab and drill 2 expanding concrete anchors through the side of the posts and into the CMUs. The CMUs core is filled with concrete so should be enough substance to receive the expanding bolts. Then where the notch goes over the edge of the slab I would put a heavy duty stainless bracket on the inside of the post to fasten it to the surface of the slab.

Does this make sense, and would it be strong enough to hold a relatively light pergola style of wooden roof structure? Or are there any specific concerns or ideas I should take into account before going ahead with this idea?

Thanks a lot in advance for any inputs from experienced people here.

Best,

Simon
 

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retired framer
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I would bolt posts to the sides , set a 2ply 2x6 on each set add a 2x6 across the front and back and hang 2x6s in between and it's ready for a plastic or metal roof.
 

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Discussion Starter · #3 ·
Thank you for the advice Nealtw.

Excuse me for the novice follow up questions:

1. By 2 ply 2x6 you mean to nail two 2x6s together as cross beams and connect those (with angle iron and nails?) to the corner posts at 90 degrees from all sides?

2. When bolting the 4x4s to the side of the oven stand, I can try to move the posts in a bit from the corners to find a CMU cell that wasn't grouted and drill all the way through and bolt it that way from the inside with a couple of thick through bolts, or I can as mentioned before, bolt it into the grouted core areas with some kind of expansion bolt. If second case, can you advise what bolts are good to use? Posts are 4x4 (9cmx9cm), and the CMUs are 4" or 10cm thick.

Many thanks!
 

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Discussion Starter · #5 ·
I would get 4X4 post bases, and bolt them down to the floor, then slip the 4X4 into the base, and bolt through the base and post.

ED


Similar to these https://www.homedepot.com/p/Myard-4...rt-Trim-Anchor-2-Pack-PNP114040-2pk/308260338
Thanks yes, I have also thought about that option, maybe slightly more heavy duty than the one you shared: https://www.amazon.com/dp/B077SZMP7T/ref=dp_cerb_2

The main reason I was trying to avoid that though is, I would then install the post base/anchor as close to the edge of the floor as possible. That would be a bit risky, concrete spalling or cracking. So that's why I started considering mounting the posts at the side of the stand.
 

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retired framer
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Thank you for the advice Nealtw.

Excuse me for the novice follow up questions:

1. By 2 ply 2x6 you mean to nail two 2x6s together as cross beams and connect those (with angle iron and nails?) to the corner posts at 90 degrees from all sides?

2. When bolting the 4x4s to the side of the oven stand, I can try to move the posts in a bit from the corners to find a CMU cell that wasn't grouted and drill all the way through and bolt it that way from the inside with a couple of thick through bolts, or I can as mentioned before, bolt it into the grouted core areas with some kind of expansion bolt. If second case, can you advise what bolts are good to use? Posts are 4x4 (9cmx9cm), and the CMUs are 4" or 10cm thick.

Many thanks!
 

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Discussion Starter · #8 ·
Thank you Nealtw for the clear info. With the depth I need to get through a 4x4 I'd probably need at least a 1" x 7" or 8" wedge anchor. I looked online and those are pretty expensive in stainless! But maybe that's what will be necessary.

Here in my neck of the woods (Japan), the common anchor type is a hybrid between a bolt and a nail, where you drive the nail in to open the wedge and then screw the nut to create tension, much like the anchor you suggesting - like this:




Any reason why I shouldn't use what's locally available?
 

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Discussion Starter · #10 ·
Yes, you're right. When saying pergola, I was thinking of the single pitch roof structure, but of course I do need a roof. I'm planning to do a plastic or galvanized shed type of roof, depending on what materials I can scavenge from the backyard.
 

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retired framer
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Thank you Nealtw for the clear info. With the depth I need to get through a 4x4 I'd probably need at least a 1" x 7" or 8" wedge anchor. I looked online and those are pretty expensive in stainless! But maybe that's what will be necessary.

Here in my neck of the woods (Japan), the common anchor type is a hybrid between a bolt and a nail, where you drive the nail in to open the wedge and then screw the nut to create tension, much like the anchor you suggesting - like this:




Any reason why I shouldn't use what's locally available?
Check the price of HDG instead of SS. I have not used those so IDK.
 
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