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I am building a 14x40, 26 inches above grade and utilizing 6x6 posts. 2x10s are notched into and through bolted to the 6x6s for the deck beams. I plan on utilizing 6x6 posts for the porch but am struggling trying to determine how the 6x6s porch posts are connected to the 6x6 deck posts. If the porch posts sit on top of the deck boards, how is the framing underneath completed to carry the load? I plan on having the floor joists rest on top of the deck beam vice attaching to the beam with joist hangers.
Lowry
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Hi, thanks for your question and using the forum. It is best to have the 6x6 posts supporting the deck and porch roof be continuous. So they need to be long enough to run from grade to the porch roof framing.
The other method is having the porch roof 6x6 posts pass through the decking and rest directly on the beam over the deck posts or deck post ends. This way they are tied into the deck framing and can't move.
I would not rest the porch posts on the decking.
Anderson Pro Carpentry
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This is the exact same issue as I have. Unfortunately my regional building department states "set beam on post, do not bolt through".
So, is there a special connecter to attach a new post (for the roof) to the joists? Or would I want to notch the bottom post?
My covered porch is 10' x 10'.
Thanks!
JRH
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| Hi, thanks for your additional question to this posting. I want to be very clear regarding the porch roof and support posts. I wasn't too clear in my first response. The porch roof system will have load values that cannot impact the deck even though it is directly over the deck. You can design and build a deck to support a covered porch roof but this requires some planning, extensive framing and supports. Pitched gable or hip roofs project all of their load along the rafters and onto the perimeter walls or posts. This load must then be transfered to the foundation or support piers. We have built screened porches directly on decks with no special independant support posts. But the deck framing and existing support structure should be designed and built to handle the shared loads. Porches like this have a common structure of plates, studs and header beams. Window openings framed much like a house. Roof rafters attached to the top plates. The entire structure attached to the deck as if it was a concrete foundation. If the porch will not have side walls and open then you are building a pavilion/square gazebo. This is normally a free standing structure and having corner posts. The posts do not share common foundations with the deck but have an independant support structure. The corner posts support header beams designed to clear span from one post to another. The beams should rest directly on the ends of the posts. Now the rafter load is transfered to each header beam, to the corner posts and into the piers. This free standing structure will naturally be free to sway. The effects of high wind loads can be offset by adding 45 degree braces between the posts and beams in two directions. This way the posts have a fighting chance to resist strong winds from storms.
Anderson Pro Carpentry
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I'm in the process of designing a deck and have a couple of questions regarding covered decks:
1. I'm on the fence between building a screened deck or a pavilion/open covered deck, leaning towards the pavilion for the visual simplicity. The deck would face the west, where the prevailing winds come from. Can you offer any advice one way or the other?
2. In the case of the pavilion, the outside corner posts support the beams for rafters. To support the end of the beam at the house end, do the beams rest on the top plate of the home's exterior wall frame?
I see many photos on your site of this type of pavilion structure and can see that there are not posts near the house which leads me to believe the beams rest on the exterior wall of the home. in my case, I have finished 2 x 6 walls and don't want to rip into them to add more support studs, but am concerned about the load of those beams on existing walls that weren't built with this pavilion in mind when the house was originally built.
I've attached an example of an image on your site as a reference.
Any advice is much appreciated.
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| Hi, thanks for your question and using the forum. If you have a finish exterior wall of your house you have two options. 1.) Build a free standing structure not connected to the house. 2.) Build a roof addition (like in your picture) that is fully intergrated into the house roof and wall framing. Option one would be less work and not effect the house. Option two would require removing the house overhang inside the pavilion. Building a roof structure that would blend into the existing roof. Adding supporting studs in the existing house wall to carry rafter beams and allot of detail work to finish the addition similar to the existing house. Basically, option two would be considered a full addition as far as the roof structure is concerned. You will also have to make sure if option two is prefered that the outer roof support posts/concrete piers are done correctly. Since the roof is attached to the house framing no movement can be tolerated with the addition. If you could post a picture of your house at the location of the possible addition this would help in determining the project scope and further recommendations.
Anderson Pro Carpentry
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Here is a photo of the back of the house for your reference.
In the case of a screened deck, what is your thought about framed walls/beams that sit on the decking as opposed to posts that run from grade all the way up to the roof beams? I've been looking at many plans for screened decks and most of the ones I've seen are constructed this way. Based on the photo I sent, is there any reason not to approach a screened deck this way?
Thanks again for the help. Much apprecated.
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| The screened porch can rest on the deck providing it is framed correctly. Consider triple side rim joists and extra 6x6 posts supporting the header/flush beam. I would not frame using a girter beam with deck cantilever since the porch cannot rest over a cantilevered section of deck. Since the porch roof will be attached the deck must be solid and well supported. Like your sample picture the porch roof framing will be incorporated into the existing house roof. This takes much more skill to pull off and make look like it was done when the house was built. You have a hip roof on the house and should consider the same for the porch roof. These can be challenging to frame right. You may wish to buy a book regarding additions and including framing details.
Anderson Pro Carpentry
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