DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Framing and Foundation > My next foundation project: Iron posts supporting cabin?





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Old 11-07-2011, 08:56 PM  
papakevin
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Thanks Joe. The unit is sitting on hallow concrete blocks. Hopefully this weekend I'll be able to give the cabin a good once over and can follow-up Sunday night.



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Old 11-08-2011, 07:38 PM  
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Has anyone heard anything about using WD-40 to kill fungas growing on wood? Does it work? Is it safe? Wondering if there's an initial treatment I can do myself to stop the damage. Thanks.



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Old 11-09-2011, 07:43 AM  
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If you contact an exterminater the whole job can be done in about 2 hours, why would you want to spray WD that would smell, contaminate the soil, and make any future treatment imposible. Yes you can order 5 gal. buckets of boron on the net and use a pump sprayer to do it yourself But by the time you order it, pay the shipping, buy a pump sprayer, and have to do all that crawling to make sure every sq. inch gets covered it's not worth the few bucks you save.

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Old 11-10-2011, 01:10 PM  
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Joe, you are correct sir. I just scheduled someone to do it. It's worth it to enjoy the weekend vs crawling under the cabin and dealing with the spray.

Apparently the spray of choice for this application is Borate (guessing that is how it is spelled). According to the guy, it is environmental friendly, kills the fungus, penetrates the wood and helps prevent future insects (like carpenter ants and termites). I'm not familiar with Borate, but assume it's some type of Borax based product / solution.

Will update on foundation pillar this weekend.

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Old 11-10-2011, 02:00 PM  
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It's just another name for Boric Acid, or boron.
Sometime your in Wal-Mart, HD or lowes look in the insecticide area at A bottle that says "Roach Away" it's 95 % boric acid.

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Old 11-14-2011, 05:42 AM  
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Spent a little time at the property this past Saturday and got my son to take the attached photos under the property. From what I can see and have learned from talking to the previous owner, the house is sitting on the iron posts, in concrete sunk into the ground (although no one knows how deep). Guessing this was constructed this way due to the proximity of the river. There are 4 posts length wise and 3 posts deep. It was constructed as a cabin, so the quality is not up to home building specs, but the interior has been modified to be as nice as any home.

The cabin has been on this foundation for 30+ years, but I'm concerned with the way it is build. My initial idea was to use concrete blocks and build up the blocks with a header board on either side of the exterior posts to add some stability to the structure in the event one of the posts would fail. Assuming I would need to dig down and pour a concrete base for the blocks, but wouldn't want to do so too close to the posts, fearing it may weaken them.

Open to all ideas and suggestions. Not looking to spend a ton of money here, but do want to steady the cabin so it will last another 20+ years. Thanks.











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Old 11-14-2011, 10:06 PM  
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Might be that I just need to get my glasses but it looks like those rim joists are just sitting on a little piece of the welded on plate atop those posts around the perimeter. If so, might be an option to sister additional treated rims to the existing to give it more support on new undamaged wood. Also might want to poke the posts all around the bottoms in particular to make sure that its just surface rust on them and that none of them have rotted through.

P.S. Shouldn't the rest of the downspouts be on the outside too? < grins >

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Old 11-15-2011, 04:50 AM  
joecaption
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This is an idea of what the foundation should have looked like.
Footings and Foundations | Raised Floor Living | Southern Pine Council™ | 1-504-443-4464
The one thing I think I see that's scary is it looks to be just a single 2X rim joist holding up on the outsides, if so that's not even close to enough bearing surface and why in some places it looks like those post are crushing into the wood and the post is tipping. One strong wind storm or earth quake and this place is history.
Those outside post are holding up the weight of the walls, and 1/2 the weight of the whole roof.
Those steel post rusting off below grade is like a ticking time bomb.
You or who ever fixes this is going to have to remove and relocate any wires or plumbing near those post so a proper footing for the new piers can be dug and another wider rim joist can be added.

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Old 11-15-2011, 07:46 AM  
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Joe, I know I'm fighting an uphill battle with this project. I'm guessing it started out as a little weekend getaway back in the 70's, and as the people who owned it grew older, they upgraded the interior and exterior without considering how the cabin was originally built.

Evstarr, I think that's an excellent idea. While it may not a long term solution, I can easily sister in some 2x8's on the interior of the cabin to hopefully gain from more support from the pillars (if needed), especially from those where it looks like the cabin has shifted and is only supported by one 2x8. If I can get this done before winter sets in, hopefully it will last until Spring, when I can really address the isssue. Might ease my mind a bit. Thanks for the suggestion again.

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Old 11-15-2011, 09:07 AM  
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Your going to have to make some lifting beams out of double up 2 X 8's and something solid on the ground with some 20 ton hydrolic jacks with steel 1/2" plates where they meet the beam so the piston does not crush into the wood and lift the house enough to be able to get anything in there to double them up, now that the old rim joist is crushed. And the two rim joist will need to be trough bolted to hold them together.



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