The crust is too thin

Crumb doneness is determined by its reaching the right temperature.  Your bread should be done if internal temperature is 195-205 degrees F.

Crust thickness is improved by the length of time the crust is in contact with steam, keeping the oven temperature constant.  That's why a covered Dutch oven gives no-knead bread a superior crust.  The Dutch Oven is very hot when the dough goes in.  The water vapor coming out of the baking dough becomes trapped steam.  You are describing two things which lessen both temperature and amount of steam which comes into contact with your dough's outer surface.  You have to open the oven door every time  you add the water you want to become steam.  The oven volume you need to have steam permeating is much larger (it's the whole oven) than in the Dutch oven method.  In the Dutch oven method you never have to add water because ALL the water coming out of the baking dough is trapped inside the covered pot if it seals well.

I think that I once heard that an opened oven door costs the oven temperature something like 25 degrees F per SECOND!

If you don't have a Dutch oven, you'll have to bake at a higher temperature and try to add your water amazingly quickly.  You should remember that crust formation happens in the early part of the bake, hence opening the door during that time is to be avoided.  Yet with your technique it seems you must open it. 

I recommend finding a Dutch oven to work with.  Either that or bake on an unglazed surface covered with an unglazed large flower pot.  You can seal the hole in the flower pot with metal pieces easily purchased at the hardware store where you might find the flower pot.  A large bolt to put down through the up-turned flower pot's hole, held in place by washers and matching nuts, has worked for me.   An unglazed flower pot stand with a diameter just larger than the upper diameter of the large flower pot could serve as your baking surface.

Good luck!

Thanks for the kind comment about my Crumb and Crust note.  It's good to know when one is being read and actually seems to make sense to someone.

As to the issue of the too-hot Dutch oven:  I've never thrown my dough into the Dutch oven the way I've seen it done in the videos.  I always found it too risky.  Sometimes I would miss.  Boy, did that feel stupid.  For a long time, years and years, I've been making all sorts of breads with the hot Dutch oven and have never been burned.  This is how I do it:  my doughs rise in a parchment paper-lined bowl.  I pick up the risen dough by pulling together the corners of the parchment paper to lower it into the Dutch oven.  Works like a charm!  I might add the this process is safer when I wear oven-proof GLOVES, never mitts.  Gloves give me more dexterity.

I made pain au levain last night and decided, at the last minute, to use a cold, cast-iron dutch oven for the bake...I followed the 'usual' no-knead bread protocols—30min with lid on and 15min with lid off. Fool that I am, I gave no consideration to the lower hydration of the loaf I was baking, compared to Lahey's NKB.

After removing the 'blazing-hot' lid, there was nowhere to put it, safely, in our tiny Japanese kitchen. I popped it on top of the pile of our metal baking and roasting trays (which usually live inside the cold oven, but were languishing on the so-called 'bar'...) The metal trays flexed rather suddenly once they heated-up...the D-O lid fell onto our expensive, beige leather sofa. I picked it up with two fingers...OUCH!

It's the first time I've ever burned myself on cast-iron cookware and I've been using the stuff for almost everything for about 35 years...we live, but we never learn! ;-)

Adam

PS: The bread was one of the best I'd ever made and the VERY best pain au levain I've managed...real 'grigne'! Another first-time experience! It was worth the burnt fingers!

I feel for your poor fingers, and the couch as well! I hate the crowded kitchen bit, am trying to get mine expanded. It isn't as small as yours, but probably smaller than you would like!

I gave up iroing clothes because everytime I did it, I burned my fingers on the iron, EVERY TIME, it just seemed that the iron was attracted to my fingers! I can live with a bit of wrinkles, and besides most of the stuff on the market these days is no iron anyway.

I've burned myself many times on cast iron, and other cookware, but its usually because I didn't think about what I was doing before hand. I love my cast iron though, it cooks the best!

Eva

Thank you all for your kind responses to my 'misadventure'. You guys are great! I'm very sorry for the delay, but it's so busy here at home! My wife and I are working two jobs each, at the moment. (The things we do just to pay our taxes!) I'm talking about the 'Poll Tax' or 'Residential Tax' that Japanese city governments levy on every adult resident. They doubled the poll tax and reduced income tax, slightly, to "compensate"...YEAH, RIGHT!

@booch221: The couch is marked (almost branded?) permanently, but no scorching. I apparently dropped the lid, one more time, after first trying to pick it up. After switching the position of the two affected cushions, you'd hardly notice, though.

@mitjak: Would you mind, very much, if I had my lawyers sue you for "vicarious liability"? Heheheh! It can wait until after Easter, of course. Let me know; I'll leave it up to you! 

@EvaB: You're too kind! I got ice onto my fingers very quickly and the skin is already back to normal. My kitchen in Australia was about 170 sq feet, had a cast-iron "Welcome Dover" coal/woodstove, next to the gas range and had a separate, walk-in pantry. Back then, I used 100% Chinese cast-iron cookware, which my mother bought for me for AUD $16!—2 saucepans, 2 skillets, a dutch oven and 3 lids. Total bliss! Nowadays, I have only 4 cast-iron pots, but am looking for more. I have a rice-cooker and 3 D-Os in different sizes, which do "double duty" as skillets/bread-forms...

Best to all!

Adam

Here's a No Knead rye bread that I bake using Jim Lahey's method.  I sprinkle some corn meal on the bottom of a hot dutch oven, gently place the loaf into the pot and bake covered for 10 minutes and 35 minutes uncovered. 

I agree with most of what you've distilled from this discussion.  I have a couple of defiinitional issues however.  They are these:

1.)  I define crumb as everything that's inside the crust.  The crust may be thick or thin, but it's still all crust.  A crackly crust itself may be thick or thin. 

2.)  You put together the words "wet" and "shaggy".  Unless I'm mistaken, "wet" refers to a dough that's of higher percent hydration that the lower hydration doughs.  I think of this as low hydration = c. 33% and high hydration = c. 75%.  I use  "shaggy" to mean a dough that is not fully mixed and the gluten form, may still have some dry flour showing, and hence has a lot of obvious tears in it.

I make this comment in the attempt to learn from readers whether there's a widespread difference of opinion about the meanings of these terms.  Maybe I've got it wrong.

I've fired my editor many times just this morning.