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Old 06-21-2014, 10:40 AM   #1
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Burying a section of framed house


Hello,


So we're building a raised patio/back porch on my friends house. The patio shall be level with the back door. Support walls have already been built....

This patio shall sit 2' higher than current grade. bottum foot of the house is concrete foundation, the next foot up is vinyl siding, beneath that tyvek, beneath that OSB, beneath that is 2x4's.


So we had 1' of problem area.

1. Cut out a one foot section of pvc, used it to cover the problem zone. Adhered with galvanized roofing nails and caulk.

2. took a 24" rool of aluminum flashing and tucked it up under the siding, meeting where the osb and pvc meet up and extending all the way down overlapping the foundation. Tacked it up with the roofing nails.

3. Caulked all joints and tarred the lower portion of flashing.

To my eye, everything is water tight. Perforated pipe is already laid out along the house and the retaining wall/patio support wall, pipe ran out to other side of wall. next move is to backfill everything and lay flagstone. Should have no big worries.....right?


I've done a lot of retaining walls and patios--just never buried any section of a stud frame house before, so I'm concerned.

thanks!

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Old 06-21-2014, 10:54 AM   #2
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Burying a section of framed house


#1, Patio should never be even with the doors threshold if there's no roof over it.
100% use way to have future moisture issues.
Depending on your local codes it may need to be up to 6" below it. (snow area)
A double layer of Ice and water shield on the wall to at least 6" below the sill plate would be what I would use.
I use a strip of 1 X 6 PVC lumber attached with trim head screws, Z moulding, J moulding then the siding at the bottom of the wall.

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Old 06-21-2014, 12:02 PM   #3
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Burying a section of framed house


Thank you. My friend is not going to want to undo work in order to drop the patio 6" lower!
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Old 06-21-2014, 12:13 PM   #4
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Burying a section of framed house


How will the water travel? If water has a chance of finding a crack and sit around, burying the wall is not a good idea. Caulk may fail and water can move up, down and sideways. If you can be sure that water is redirected and will drain well next 50 years, then why not. Some basement walls are built with pt ply and studs, although it is not my own experience.
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Old 06-21-2014, 01:32 PM   #5
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Burying a section of framed house


Last summer I rebuilt a house that tried the same trick---water and insects got in----several thousands in damage---I don't like the idea--
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Old 06-21-2014, 02:32 PM   #6
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Burying a section of framed house


Used to be one of my main sources of income going back and fixing builders mistakes like that.
I've had to repair dozen of them built to close to the thresholds.
Live in an area where there's snow then it needs to be lower. (6")
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Old 06-21-2014, 04:23 PM   #7
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Burying a section of framed house


what is the floor of the patio/back porch constructed of? is there a roof over the patio/back porch?
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Old 06-22-2014, 09:33 AM   #8
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Burying a section of framed house


Thank you, everyone for the responses.


Floor shall be dry laid flagstone. Pattern-flag, tight joints 1/8'-1/4", filled with stone dust. Patio will have a pitch of 2.5" fall over 10' span.

No roof over the patio.

I'm considering lowering the patio 6" Costly, at this point, but I'm thinking it may need to be done. And yes, there is snow up here.

If we do that...... then there is still 6" of stud frame, covered in plastic/flashing and tar--buried. There is also perforated pipe, wrapped in filter fabric, situated right at top of foundation.

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Old 06-25-2014, 04:58 AM   #9
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Burying a section of framed house


I've seen 3 examples of this--all were at various stages of being torn apart, rotted joists, studs, flooring, drywall etc being replaced. On one of them, we only figured out why a flat roof held a pool of water, when a excavator with a breaker attachment showed up to remove the concrete patio, and revealed that the whole outside wall had lost all support due to rot. The stucco siding was holding it in place otherwise it would have subsided a lot more than it had.
2 of the 3 were less than 20 years old.

So I would not do it, ever. You could build a retaining wall a foot or so out from the house to support the paving, and cover the gap with wood decking, we did exactly that at my parents house when they wanted paving near to the interior floor level, in that case it did have a roof over as well.
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Old 06-27-2014, 11:25 AM   #10
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I would never backfill dirt against wood framing no matter what concoction of water proofing I dreamed up. If you must, then follow the procedures for wood foundations. I believe all the wood in wooden foundations are treated for subsoil use. Is any of this framing treated?

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