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Old 03-27-2012, 10:58 PM   #16
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Footing for new deck posts


Check your new point load of the new posts to the existing footing thickness/width, the length is probably fine. Figure the loads and footing requirements here (if you are under this code): http://www.awc.org/Publications/DCA/DCA6/DCA6-09.pdf

Other details they will want; new ledger attachment to/through the brick (check possibility in the deck code site), and 2nd floor windows on the deck being tempered glass.

Gary

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Old 03-28-2012, 07:03 AM   #17
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Footing for new deck posts


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Originally Posted by GBR in WA View Post
Check your new point load of the new posts to the existing footing thickness/width, the length is probably fine. Figure the loads and footing requirements here (if you are under this code): http://www.awc.org/Publications/DCA/DCA6/DCA6-09.pdf

Other details they will want; new ledger attachment to/through the brick (check possibility in the deck code site), and 2nd floor windows on the deck being tempered glass.

Gary
I have simular info provided by the Building department, but there's nothing specify about the concrete blocks as footing for the posts. The existing sunroom was built to code with full foundation & footing like a house. The existing 10" ledger is bolted to the house wall (4" concrete block + 4" brick interlocked) and in good condition. Instead of removing it and making new holes, I'm thinking about re-use it if it is structurally sound. The 2nd floor "windows" is a new 12' wide patio sliding door and to code. Originally I wanted to rebuild the sunroom with a flat roof deck, but it blocks too much light in the walk-out finished basement and costs a fortune.
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Old 03-28-2012, 07:14 AM   #18
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Footing for new deck posts


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Originally Posted by Daniel Holzman View Post
I missed that detail about the existing foundation being four feet or greater deep. But later you noted that you had to prove this to the building inspector, and show a cross section. And earlier I think you noted that you had dug up one section of the foundation, and found it was four feet deep.

There is nothing wrong with a concrete filled block foundation that is below frost line. As long as the block is in good condition, and there is no reason it should have deteriorated, I don't see why you can't use it to support some PT posts. You may be able to chip out some of the concrete inside the block so you can install a Simpson stand off bracket, or you may be able to epoxy a bracket in place. Either way, if the building inspector is OK with it, your contractor should play ball, and it certainly sounds like it will save you some money and aggravation.
There's so much info on using new sonotube as post footing and nothing about re-use existing concrete block foundations on the web. As a software developer, I know it's easier to write a program from scratch than trying to fix someone else's program. But in real life, it happens and we just need to found a solution and work it out. The interior wood of existing sunroom is in good condition, but the windows & exterior is ran down due to lack of maintanance by previous owner.
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Old 03-29-2012, 04:55 PM   #19
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Footing for new deck posts


I would be somewhat skeptical of using the existing block footing to support the deck. I agree it MAY be fine to handle the vertical load but I dont see how it can provide proper uplift resistance being they are hollow blocks. I would highly recommend calling a NADRA certified deck builder in your area, to come and take a look.
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Old 03-29-2012, 08:47 PM   #20
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Footing for new deck posts


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Originally Posted by JON MIGNANO View Post
I would be somewhat skeptical of using the existing block footing to support the deck. I agree it MAY be fine to handle the vertical load but I dont see how it can provide proper uplift resistance being they are hollow blocks. I would highly recommend calling a NADRA certified deck builder in your area, to come and take a look.
Good point about uplift resistance which I have not thought about. I'll add a 4' rebar in each block where the post connector will be installed before refilling the concrete. This should give a much stronger connection in the immediate concrete blocks foundation all the way to the footing. To summarize, following is what I'm going to do:

1) Use existing sunroom concrete block foundation.
2) Open up the cemented holes on top layer of concrete block where posts will be installed.
3) Drop a 4' rebar in the holes, fill the hole with concrete and set-in post connectors.
4) Since the standard 2"x6" lumber length is ..,12', 16', .., I'll resize the deck to 12' deep and 16' wide with four (4) 6"x6"x9' PT posts, 2"x10"x16' PT beams, and 2"x10"x12' PT joists.
5) Build planting boxes on the outside 2 corners for plants and would also help weight down the deck.

I hope above will give a long lasting deck. If you have any concerns or advise on this matter, please kindly post more and I'll check back this thread often.

* * * * *
I like to take this opportunity to thank the great advises from all other members. It's been very educational and fruitful. I'll now try to workout the detail and "convince" the building inspector every is good to go and have a contractor to build it and stain/seal it myself.

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