A look back at the cabin design progress

It’s coming along. I promise.

This is just a timeline for me of how my ideas fleshed out over time. Progress made and lessons learned. I’m still in the middle of designing the basics of my “Kleinhaus” (small house) and this is a bit of a timeline how we came to the current phase. From newest to oldest:




So there you have it. I’m still in the process of putting ideas to paper which will be posted here soon. In the process of creating these posts, I’ve had the opportunity to speak to real architects and discuss ideas on modularization. I.E. I want to be able to make incremental changes as technologies and codes change without affecting the rest of the structure.

Part of that process has been creating a “Utility Wall” which will house the majority of the plumbing and electrical circuits. Since the kitchen and bathroom share this wall, I feel this will be the most sensible approach to this. The wires in the walls for outlets and switches will all congregate in the upper section of this utility wall. The majority of the plumbing will be toward the lower section separated from the electrical panel by at least two stud widths in case there’s a leak.

I’m not the first person to come up with a utility “module” of sorts as I came across these videos recently :

I think that gives a brief glimpse of what’s possible and since my Utility Wall will be larger than this, I’m sure I can work in the electrical hookups with ample room to spare as well as improve safety. Since the utility wall wouldn’t be load-bearing, we can cut as many holes as needed in the studs without compromising structural integrity.

An additional benefit of the modularization would be being able to move the kitchen and bathroom to either side of the utility wall. This will also enable moving the stairs and front door to either side as well, without changing the rest of the structure. Considering that I’m designing this not just for me, but for anyone interested to take and run with, I feel having this kind of flexibility is essential to adoption.

I haven’t worked much on the roof yet as that’s proving to be a trickier affair. Supporting a fair amount of weight while maintaining a simple profile is proving to be a challenge. A single slope roof would be the simplest to design, but building it in a safe manner would be a bit of a challenge. Multiple slopes is easier, counter-intuitively, easier to build in some ways as the methodologies are well established, as are the building techniques. More pondering is in order.


Kleinhaus: Cabin progress

Just a heads up that I’m still not dead and the cabin designs are progressing well, albeit a tiny bit slowly, since the last time I posted an actual design update. I’ve since named this whole cabin project “Kleinhaus” (German for “Small house” — I thought it was pretty clever). I moved away from fancy pure-Photoshop footwork to basic drawing and then scanning followed by a Photoshop cleanup. I found this to be a tad easier and I’ve had lots of helpful suggestions from folks since I started this journey. Many thanks to all of you.

2 Sheets done (hopefully)

The following are sheets 3 and 4 of the overall blueprint which detail the foundation. I’m still working on the elevation views and floor plan and the overall shape of the cabin has changed a bit to accommodate some much needed design overhauls. Gone are the weird 21-24-21 joist spacing of the first layout. This time, it’s all 24″ on center joists for simplicity and my own sanity. I did away with starting from estimates and then moving on to measuring and instead started with concrete measurements first. I found that this makes more sense since it’s harder to skew corners or screw up the lengths on paper. That doesn’t mean these are free of errors and you should go ahead and start with these measurements without double-checking!

These are only 1200 x 1623 full size, but the actual image I’m working with is 5620 x 7600 pixels (18.73 x 25.33 inches at 300 pixels/inch) which is a tad too large to post here. I’m going to make the full size blueprints available as a PDF or something as soon as I finish and correct any errors.

As always, these are provided as-is. Always check the measurements first, follow local building codes, there be dragons etc… etc…

Kleinhaus 16x16 Cabin: Sheet 3

Kleinhaus 16×16 Cabin: Sheet 3

Kleinhaus 16x16 Cabin: Sheet 4

Kleinhaus 16×16 Cabin: Sheet 4

The cabin design (or back to basics)

For the last year or so, I’ve been trying to put together the interior of my cabin so I’ll know what areas need windows and where I can put the plumbing. This got to be too cumbersome, so I moved to starting the design from the exterior and moving inward. This too, as several people have taught me over email, is also a case of Doing It Wrong. (Thanks, guys. I owe you lots of coffee!)

Parallel design

The solution, it turned out, is to start both at once. The interior influences the exterior and visa versa. You need to be prepared to adjust both as necessary, however the interior cannot get sacrificed for exterior fancy. This was the biggest mistake I’ve been making so far.

And it’s such an easy mistake to make.

As I’ve mentioned before, I’m not a trained architect and I haven’t studied structural engineering (I mean, I started studying engineering in school, but then something went horribly wrong and I ended up in computers… which I hate.)

So between the helpful email sessions and close to 20 or so drafts, I decided I’ve approached this whole thing with the wrong attitude.

Beautifully impractical

I’ve fallen under the spell of first impressions. I see a design for a cabin or tiny house that’s absolutely stunning and think, “Yes! That’s what I want!” But is it really? There are times when what seems to be such an inviting place will be a nightmare to live in.

Case in point, here’s a design that was love at first sight…

The snow really makes the picture, doesn't it?

The snow really completes the picture, doesn’t it?

Close-ups of the front left and rear right.

Close-ups of the front left and rear right.

...And in the spring/summer.

…And in the spring/summer.

As much as I’d love to live here, I can already hear the grumblings of people who have actually built houses. All that glass, while giving a fantastic view of the surroundings, would make this place near-impossible to cool in the summer and equally so to heat in the winter. It’s a magnificent piece of art meant to be looked at and desired.

But like a piece of art, it’s not really meant to be used.

Window overload

While the above cabin example has windows all around, there are others that put the majority in the Northern face for increased interior illumination and view without adding to the cooling costs in the summer. But… can you spot the issue with the design below? (via Apartment Therapy)

Olle Lundberg's "Sonoma Escape"

Olle Lundberg’s “Sonoma Escape”

I love this design. And it breaks my heart to say, I can’t live here either.

This has been the biggest dilemma I’ve had so far. I love windows. I hate lack of privacy. I’m sure the pragmatic types will say “curtains!” But it’s not so simple really.

It would be pretty silly to have all those magnificent windows all covered up.

Enter (and exit) the Flat Roofs

A flat or low slope roof on a tiny house seems to almost be a de-facto standard for “ultra modern” designs these days. You can’t even picture one without thinking of that phrase “if we’re destined to live in boxes, why not build better boxes?” But we’re not really living in boxes, are we?

You can see this in items that are meant to be stacked outside like container boxes. The weight is actually delivered to the corners, which is then transferred to the bottom. But they’re not meant to deal with things like heavy snow or solar panels on the roof.

Flat roofs, while aesthetically appealing, suffer a big, hard to ignore, problem: They need frequent maintenance. Those who say otherwise, haven’t installed or maintained a flat roof. Sure, there are new membranes and methods of installation, cool roofs etc… however these too don’t account for the increased load the structure will withstand, especially if it’s made of wood.

It's gorgeous! But will it survive 3 feet of snow? How about gusts of 60Mph+ ?

It’s gorgeous! But will it survive 3 feet of snow? How about gusts of 60Mph+ ?

There’s another issue with flat roofs that’s directly related to my own frailties (not to turn this into a sob story).

I already mentioned this in a previous post; I’ve had juvenile arthritis since about the age of 12. Something I’ve inherited from my grandmother. I’m 30 years old now, but I’ve come to accept that in another 15 – 20 years, my fingers and hands will have reached the end of their useful life. It’s already a little difficult for me to type for long at a stretch and if I keep at it for most of the day, I have to stop and gulp some Aleve before going on.

If I’m gonna build a cabin that I know will probably be the place I’d want to live in for the rest of my life, do I have it in me to follow through with its upkeep? I don’t want to end up in an old folks home. That’s the one fear I’ve had all these years so if I can’t fix the leaks in my roof myself or can’t afford to pay someone, that’s exactly where I’ll end up.

A house for me should be safe for me, functional for me and above all else, last for me. Ideally, it should last for others who copy the design as well, as I’ve mentioned previously, it will be open source.

How do people who build these for a living do it?

This should have been the question I ask myself, but when you’ve fooled yourself into thinking you know what you’re doing as I had, it’s also pretty easy to ignore. But getting down to brass tacks, here are a few examples (via Tiny House Blog).

Namekagon Cabins "Park Model" Notice how it has no frills whatsoever.

Namekagon Cabins “Park Model” Notice how it has no frills whatsoever.

Interior right as you enter the "Park Model"

Interior right as you enter the “Park Model”

...and interior left.

…and interior left.

One thing that struck me immediately is that these are designed to last not a few years — if the foundation is permanent — they’re designed to last several decades. I don’t know what the foundation is like exactly (looks like it may be surface only), but this is, for all intents and purposes, built like a tank.

The windows are few and much smaller than I had in mind, but it works in this application. So…

Back to the drawing board

After some back and forth over emails with some very knowledgeable people, it seems the foundation of the cabin is the one part I got right the last time. Some would have preferred 16″ on center floor joists, but said 24″ is acceptable provided I double the base flooring ( 2 layers of OSB with overlapping joints ). I was told this will greatly reduce or completely get rid of the “bounce” which will be critical when I install the tiling in the bathroom. Don’t need cracks in those the first year of occupancy.

I’m having another go at the ye olde Photoshop this week to see what else I can come up with. The foundation, as mentioned, was the only thing that seemed just fine so that will remain as-is. The rest? We shall see…

Cabin design update

Oh, right. I have a blog.

Between a bit of a tenuous return to work after my flu episode (where I filled in for 2 people who quit and 4 more that also came down with seasonal plague) and the fact that I’ve been busy with a side project for a while, it’s been quite a few days since a real post.

I have been making a few strides in the cabin design in that I’ve finalized the overall layout of the interior and most of the left side framing layout is now complete. Which brings me to licensing: I want to make this design accessible to as many people as possible without making myself liable beyond the scope of due diligence. I.E. I want to do a good job making sure I cover all my bases with regard to structural integrity, but I don’t want to be sued into oblivion for my trouble.

The Cabin design will be Open Source

All the structural aspects of the cabin will be open to anyone to download (I’ll probably make a full download link available here), and modify for their own needs without having to pay me royalties. All I’m asking is for the copyright to remain intact.

That being said, I’ve been using a heavily modified ISC license for the past two times I’ve released any updates. This, I feel, isn’t really applicable to structure since these were originally meant for software. Being a software developer, naturally that was the first place I looked. I’m still using a heavily modified ISC license, but I’m open to suggestions on how I can license it.

I need to find or create a good license that will help me share my ideas without being subject to any sort of litigation. We’re talking about structure here and there’s a real risk of injury or worse if it’s done incorrectly. But I still want to let anyone feel free to modify it without too much legal wrangling while still indemnifying me.

Is it safe?

This has really been the question that’s stayed with me since I started on this journey.

I’m not a trained engineer, although I think I’ve taken reasonable steps to ensure everything is structurally sound, however I’m using OVE (Optimal Value Engineering) practices where applicable. I.E. 24″ On-center stud spacing, 6″ studs and using standard length materials (using 96″ studs as much as possible) to reduce weight, maintain proper insulation and still remain structurally sound to snow and wind loads. Also, I’m avoiding any cuts to the studs for the windows. The only cuts to the studs are at the front door and the bathroom entrance of the internal wall. I’m considering eliminating the center column by turning the bathroom wall into a load bearing one. We’ll see.

OVE is still somewhat controversial among builders for varied reasons. Some people believe it’s not as secure, others think you’re not really saving on materials, so there’s no “value”. My opinion is that the “value” comes with energy-saving. Granted you’re using less material, but this is not the primary benefit.

A sneak peek

Here’s the last sketch I did of the left side external framing layout. Note: The angle of the roof is approximately 50 degrees to accommodate year-round solar panels for the Northeastern U.S. This isn’t optimal since, ideally, you should be able to change the angle, but I don’t expect people to hop on the roof every few months to do that so this angle will have to do.

I’m still going with a 16″ x 16″ footprint with a 16″ x 8″ loft. Shaded in areas on the 1st floor are the support beams. See the previous foundation update for how they’re put together.

Left side cabin framing sketch

Left side cabin framing sketch

Special thanks to Kelly and her partner for offering me advice along the way.

Heating the Cabin

This is just me thinking out loud. I may or may not use these ideas in my own cabin, but in case someone else is also looking for a place to start, they’re welcome to use them.

The space is so small, I can either easily turn it into a sauna or expend the same futile effort of a candle trying to heat a concert hall, so moderation is a big issue. Above all else, whatever method I choose has to be relatively self-governing since I don’t feel like waking up every 4 hours to replenish the heat (although I wake up every 4 hours anyway due to insomnia).

The first place I looked was, naturally, solar.

Electrical = No Dice

I quickly eliminated an electrical approach due to the excessive drain. No matter the output of any photovoltaic cell + battery combination, in-floor electrical heating or some sort of space heater would be too much of a drain on the power supply for the size of the cabin.  According to my current estimate of the South facing roof, I would have approximately 120 square feet to play with and even if I covered every inch of it with PVs, I don’t think it would be enough.

Also, if there is an extended period of overcast in the Winter, I’ll be in serious trouble trying to maintain the heat while toning down the drain of any other appliances. This sort of juggling feels like too much of a hassle and the whole point of this was to get away from stress. I want to enjoy those little luxuries like bright lights, induction cooker, a microwave and maybe a toaster every once-in-a-while without having to resort to Watt-pinching.

Solar Hot Air?

If this is supplementary to another method, then it works the best. There are countless examples on the web of solar heaters for the home, all with varying efficiencies and ease of construction. What I wanted was something that I know for sure I can build, won’t cost a fortune and will be reasonably effective without having to turn one whole wall into a collector.

And above all else I don’t want to have to notice that it’s there.

I then looked at solar heaters using Aluminum downspouts as collectors and came across the best iteration of it so far. What I really like about this concept is how low-profile it is. Granted he’s trying to heat a full house, basement and all, but I think I can get away with less than half this size since the overall cabin is small. Best of all, I don’t always have to look at it.

It would be a fairly simple affair to wire up a fan or two, a thermometer inside the cabin and one in the collector to a microcontroller and power the whole ensemble with photovoltaics. Computer fans typically run on very low power, most are fairly quiet and are designed for variable speeds making them the ideal choice, I think. Also, I can easily replace these parts without too much expense when they break down.

But as I mentioned above, this will only work as a supplement to something else for days that are overcast for long periods or (heaven forbid) if the cabin got struck by lightning and my arrester and breakers failed frying all the electrical stuff.

Small Stove

I’m a bit ambivalent about all the DIY stove designs floating around out there. On one hand, these are improvised designs, but on the other hand, these are improvised designs. There’s a reason why commercial stoves aren’t made of used air, Freon, LPG or similar pressurized tanks.

Regardless of origin, the traditional approach to a stove is basically a container to burn the fuel, a one-way air input control, a baffle to delay the hot gases existing before heating the surrounding air and finally, a flue. I think it’s time we started moving away from the traditional arrangements for this combination.

I want my stove to not look like a stove.

Traditional stoves have a quaint appeal that works well in rustic settings, but that’s not the look I’m going for. Besides the efficiency issues, traditional stoves take up more room and are fairly dangerous (especially for a clutz like me). In this vein, I’ve looked at these allegedly hyper-efficient Rocket Stoves which are all the rage these days.

They turn an ordinary flame into a twirling vortex of hot gasses inside the burn chamber, shoot inside an outer chamber warming the ambient air, then in turn can be vented under a bench for warmth before being exhausted outside. That’s quite a long list of opportunities to use the hot gasses for actual heat as opposed to conventional stoves where most of it is lost to the outside air.

Via Richsoil.com

Alas, the Rocket Stove also has the same problem: It looks like a stove.

If you need a demonstration of how one would construct such a stove simply, this gentleman had done so with ordinary household items. The demo is in Japanese, but the explanation is very well done visually so it should still be understandable.

It also takes up too much space and it feels like there’s way too much effort and mess to get an efficient heating system going. Besides that, it still needs that tendering that I don’t like so much as mentioned at the beginning of this post and the style is all wrong. For some reason, every Rocket Mass Heater I see reminds me of the structures on Tatooine.

I’m also more inclined to go with a biomass option for fuel since it gives me the greatest flexibility for automation. If I want my stove to shut off or limit itself by automatically (I’m fine with having to start it), then conventional — therefore odd sized — wood and sticks ain’t gonna cut it. I need a steady stream of fuel in a predictable size range that’s easy to manage while at the same time being environmentally friendly.

Pellets it is!

Not only do they offer the most flexibility in terms of fuel (I can use everything from grass, hard or soft wood to even plant fiber derived cellulose), it gives me the ability to control the flame without too much handling. More fuel + more air = more heat. Less fuel + less air = less heat. And that’s about it.

I’ve been thinking of applying the rocket stove idea to pellet fuel, but most of the rocket stoves I’ve seen require manual feeding of some sort. Besides, there’s the mess problem as mentioned above. I thought this can all be improved with something very simple like a chimney connected to a burn chamber by a tube of some sort that will act as the horizontal leg of the rocket stove.

Lo and behold, someone already came up with the same idea ages ago!

This video is also in Japanese, but the product demo is very visual as above.

What I really like about this is how simple it is and how inoffensive it is visually. Most of the hodgepodge rocket stoves I’ve seen look like they belong on Serenity, the spaceship, and not in a good way. While this is a testament to the improvisational capabilities of the builder, I don’t feel like I should improvise on safety.

By combining the Rocket Stove idea with some of the concepts of the above product, I figured I can build myself a stove that ran on pellets, doesn’t look like a stove (or at least is easy to hide that fact) and isn’t cumbersome to operate. So I set about designing a stove that does just that.

This is a quick sketch of all my ideas for an “automatic” pellet stove

If the pellet hopper has a lid, I can hide the whole thing as a piece of cabinetry or even use the top of the hopper as a small table. The air supply can be a feed from under the cabin so I don’t have to drill holes in walls and other nonsense. Also, by putting the air supply inside the cabinet, I can reduce the cold air leakage into the cabin from there.

Now that I look at this, I think the only “control point” necessary would be on the air supply. If I turn down the Oxygen, the burn rate goes down and so does the temperature. Though I’ll still need a shutoff for the pellets to completely stop the burner in an emergency.

I think I can hide the starter burner in a cabinet as well or I may not even need it if it turns out the length of the flue is enough. And the best thing about this design is that I don’t have to touch anything inside the cabinet until it’s time to clean the ashes. I’m sure I can automate this too somehow, but for now, this gives me the least amount of “homework” while operating the stove.

Just load with pellets, light it, walk away. Of course, I say that now, but we’ll see how well this will turn out.