Failed Imagineer posted:

Now that we know those aircrete blocks float, I've come around to those piles being necessary to anchor the whole house during floods

Computer viking posted:

Are piles equally resistant in both directions, or have they only been approved to handle downward forces?

quote:

Uplift capacity of single piles and pile groups embedded in cohesionless soil
Conclusions
Experimental tests were conducted on single piles and pile groups containing two, four, and six piles under pure uplift loading. The test results are presented and discussed in this paper. Based on the foregoing study, the following main conclusions are drawn:

1.The behavior of single piles under uplift loading depends mainly on both the pile embedment depth-to-diameter ratio (L/d) and the soil properties. The net uplift capacity of a pile improves significantly with an increase in both the (L/d) ratio and the relative density of soil.

2.An upward displacement of about 1.4–2.5% of the pile diameter is required to attain the net uplift capacity for both single piles and pile groups. A very small upward displacement, 0.4–0.6% times the pile diameter, is required to develop the allowable uplift load.

3.The load–displacement behavior of a single pile embedded in sand under uplift loading can be represented adequately by a power equation that includes simple parameters. This equation needs to be verified by conducting full-scale uplift-loading tests on single piles.

4.For a net uplift load per pile in a group equal to a single pile load, the upward displacement of a closely spaced pile group increases due to interaction effects between piles.

5.The efficiency of the tested pile groups under uplift loading ranges from 0.32 to 0.83 according to the number of piles in the group, the pile embedment depth-to-diameter ratio, and the relative density of sand.

6.The efficiency of a pile group under uplift loading decreases with an increase in the number of piles in the group and with an increase of the pile embedment depth-to-diameter ratio.

7.The efficiency of a pile group under uplift loading increases slightly with an increase in the relative density of soil.

Darkest Auer posted:

Shitposting aside, I actually want to know what the ventilation is like up at the loft. I might have missed or forgotten things along the way, but what with the airtight bulkheads all around, did you remember to put some air holes in the unplanned areas?

Computer viking posted:

Are piles equally resistant in both directions, or have they only been approved to handle downward forces?

withak posted:

I am a licensed professional engineer specializing in foundations and I can assure you that piles handle forces in both directions!

withak posted:

Just marathoned the thread and I have the following comments:

1. That tile roof with the mixed colors is handsome AF.

2. I am literally a licensed geotechnical engineer and your first photo of that pit with all of the glistening clayey soil gave me the willies. Putting piles in was definitely the right thing to do, otherwise your long thin house would be flexing up and down like a bucking bronco as the ground wets and dries with the seasons. Pro tip: make sure your utilities don't have any rigid connections where they enter the house because this movement could still cause problems there in the future. I'm curious if any of your neighbors have basements?

3. The pile installer probably took you for a bit of a ride. You might have had better luck with a specialty contractor who does stuff like underpinning or other kinds of temporary support of existing structures when underground work has to happen close to delicate existing structures. They are usually better prepared to do deep foundation work with smaller equipment in smaller quantities and in tight spaces. The guys you used are probably are used to measuring their productivity in hundreds of feet driven per day.

For future reference an engineer probably could have provided some criteria (in terms of minimum blows/foot) that would allow them to stop driving once they reached the required capacity. An exploratory soil boring by an engineer could also have provided data to support a less conservative design. Unclear whether the cost of that extra engineering work would have allowed you to save much money on a job this size though.

Darkest Auer posted:

Shitposting aside, I actually want to know what the ventilation is like up at the loft. I might have missed or forgotten things along the way, but what with the airtight bulkheads all around, did you remember to put some air holes in the unplanned areas?

NotJustANumber99 posted:

Interesting hadn't really heard of those. But no, from reading up on them they look not ideal for this use case.

You can get drop down air tight seals. They're more marketed for fire and acoustic stuff I guess, but achieve the same end result. So you rout out a like 20mm channel in the bottom of the door that it fits in. Theres a button that presses up against the inside corner of the frame as the door closes that launches the spring loaded drop down seal. Its pretty star trekky.

Theyre probably twice the loving price of the doors themselves.

Also because I have MVHR, in theory building regs are stricter on the gaps under internal doors. As in they make me have larger gaps to ensure the air flow between rooms that would be necessary if you were only extracting from moist areas. So I dunno I'll need to explain to them I'm too advanced for their "regulations" or just comply and hope I can get really droppy drop down seals.

knox_harrington posted:

No thanks

NotJustANumber99 posted:

NotJustANumber99 posted:

So I have trodden in poo poo today.

Round the back, right by the plant room door. Stunk. No way it's a deer or anything.

Like dog? But where from? So is this a human poo poo?

I took a photo. Do we want to see it for analysis?

Ratjaculation posted:

Post the poo poo.

Ratjaculation posted:

Post the poo poo.

NotJustANumber99 posted:

big news, just signed the book deal to transcribe the thread to book

cover art is back