Sunday, June 25, 2017

DIY AWNING SCREEN FOR THE AIRSTREAM INTERSTATE

Did you ever wish your van's awning could be turned into a bug-free outdoor room (relatively bug free, at least)?  So did I, but given the size of the project, it took me a couple of years of van ownership before I got around to making it happen.  And because of the time commitment needed for a project like this, let me first show you some commercially-available alternatives, and explain why I we could not use them with our 2007 Airstream Interstate.
Far too bulky for carriage in any Class B RV.  And too Grandma-ish also. 
Ditto on the bulky (look at the top cover).  Plus I didn't know if we'd be able to find the right size to fit our older awning. 
Some of those commercial options are also very expensive, up to about $750.  Here's another example. 
Here, we were getting to the minimalist design that we needed.  But this would still have required modifications, and if it were mosquito netting rather than no-see-um (it looks like mosquito), it would still have been far too bulky to be carried in any Class B RV.
Some of the less-common alternatives were amusing.
If we wanted to sleep six people, that might not be a bad choice. 
The outdoor room is bigger than the van. 
And this gem:
It gets an "A" for originality - the whole van fits inside.  There are a couple of different versions of this on the market.  I would not recommend firing up that camp stove in there, however. 
Last but not least, here's an amusing targeted ad.  It showed up about two weeks after I'd done my screen searches but obviously did not purchase any of them.
No, dang it!  I didn't buy any the first time and I'm certainly not going to be lured in by lower prices on stuff that still doesn't work for me. 
We needed a very minimalist noseeum surround that would pack down into a very small package because of the limited space in our vehicle.  We couldn't afford to devote much space for it, but at the same time, we desperately needed a solution for our planned late-summer 2017 trip to Canada.  The last time we went to our target destination, the mosquitoes were so numerous at night that they would actually wake me up with their collective whining.
Except it's not son - it's daughter.  It's the females that feed. 
Hundreds (thousands?) of mosquitoes would collect on the outside of the Interstate's flap window screen, to the point where the noise became too disruptive to sleep through.  You haven't experienced mosquitoes until you've experienced Canadian mosquitoes.
It's true.  I've known people who plan their outdoor lives around that tiny interval of time between disappearance of snow and debut of the first spring hatch-out of black flies (which typically precede mosquitoes). 
Here are some general pointers on how I designed and executed a custom screen solution.  First, the materials I used.
Black noseeum fabric from Online Fabric Store.  I found the quality to be surprisingly good for such a low price (by that I mean it was very strong and did not melt under a medium heat iron).  I significantly over-bought, ordering 21 yards.  A typical Class B van awning will require something closer to 15 yards (#vansizedsewing).  
This rip stop at JoAnn also proved to be surprisingly good quality - tough, and with no bias stretch to speak of (which is really important for a project like this - don't go cheap or your workpieces will become unmanageable).  I think I bought 3 yards (can't recall exactly). $3.99/yd would be a very good price if you could get it for that.  I paid closer to list.  
It looks like this in the store. 
Here is the "gist" of the two same-sized panels that I made with the intention of having them meet magnetically in the middle.  


Now, you may ask, why did I settle on that design instead of some other?

Well, first and foremost, it became apparent to me that I would never be able to physically manage this screen (put it up, take it down) unless it were divided into sections.  I couldn't sew a single surround where, for instance, maybe you could squeeze into it through the side, where the screen meets the van body.  It would simply be too large.

Logically, then, if it had to be two pieces, the simplifying assumption was to make it into two identical pieces.  Less head work that way, and it would also produce visual symmetry.

So, if I were going to make two identical panels that would meet in the middle, I thought I needed something to signify that entry would be through the middle where I was adding a magnetic closure.  For that reason, and also to increase lateral strength, I added a seam near the bottom of the two side panels, but kept the center panels full-length and less visually obstructed.  It's sort of analogous to what is often done with lobby windows in skyscrapers.  There's usually a visual design feature that orients you toward where the actual door is situated in all that glass.

My construction sequence was as follows, generally speaking for each of the identical panels:

(1) I cut two 70" side panels of noseeum fabric and stitched them together down the side (see second pic down for instruction on the flat seam).
It would be best to have a room-sized table for this work, as they have in industrial businesses that manufacture boat sails and other large fabric items.  But most of us don't have access to that kind of thing, so I used my kitchen floor.  At times I also used painter's tape to hold the fabric in place, as much of my measuring was done off the ceramic tile seams rather than with a tape measure, because the thing was so large. 
(2) I trimmed the tops with the rip stop nylon.  On the panel that must eventually attach to the center full-height panel, I left a "tail" of rip stop to be spliced into the top portion of that center panel.
I cut 4" strips such that, when they were seam-folded on both sides, the resulting top border was about 1.25" wide. 
Six of these strips have to be cut for the top portion on each of the two screen halves, and then more for the central magnetic closure.  I used a 4" template to cut several, and then had to re-square my rip stop before proceeding with more. With large projects, inaccuracies tend to snowball unless they are corrected.  
(One day I will get around to replacing this disgusting ironing board cover.)  This photo shows that the nominal widths of the two fabrics are different, but that doesn't matter.  In fact it's helpful in splicing the various panels together.  You wouldn't want selvage seam to fall on selvage seam.

This photo also shows the side seaming method.  Place two panels together, fold over jointly, sew near the raw edges, open it out, fold it flat over the raw edges, and stitch the seam open.  
(3) I stitched the bottom pieces of noseeum onto the side panels using the same approach.
In yoga terms, there was a lot of wide-legged folding associated with this work - without an industrial-sized work table, this becomes a surprisingly strenuous project.  Here's one of the bottom strips getting positioned and readied for cutting.  
(4) I cut the longer center panels (both of them) and stitched one side seam on each.  This was where the magnetic closure would go, as it is to be encased in yet another strip of rip stop on each one.

(5) I cut and spliced the center strips of rip stop, ironed them (your iron will be your best friend in a project like this), pinned them to the fabric, and inserted the first row of neodymium magnets into that strip to be sewn shut.

Here's my method of working with neodymium magnets in a sewing context.  I hold the magnets to be included inside the workpiece using magnets temporarily situated on the outside of the workpiece.  Neodymiums are so difficult to work with that I haven't found a better method.
So here, for instance, is a close-up of the two center panels.  The neodymium magnets that you see are not the ones that will be permanently affixed to the workpiece - they are holding other magnets in place, that are inside these seams, until I can get them hand-basted into position opposite each other. 
The stitching process will scoot the internal magnets around because the magnets will want to stick to the sewing machine, but if there are "keeper" magnets placed on the outside to control them, they won't get lost in the seam pocket and the outer magnets can be used to re-position them to where they ultimately need to go.  Then, after the internal magnets are hand-basted into place, the outer magnets can be removed. 
It's important to do this magnet positioning thing accurately because otherwise the center strip will have gaps.  And gaps will let in mosquitoes.  Let me explain further.
Here are the two center panels with all of the keeper magnets in place down the center of each converging side.  You can see that they are directly opposite each other - to within a couple of millimeters.  Tap the photo to expand for greater clarity.

Obviously I'm controlling an avalanche of noseeum fabric using clothespins here.  Otherwise, it would be impossible to work with. 
And here's what it looks like once the internal magnets are all stitched into place and attracted to each other, one side panel to the other, and the outer keeper magnets removed.  The resulting magnetic joinery lies flat.  Very important.  
Here's an interim stage of stitching, where both center panels are finished where they meet, and the double side panel is situated beside it.  In this pic, I've yet to add the extra foot or so of noseeum fabric at the bottom of the side panel. 
(6) Once the center and side panels were completed respectively, I stitched them together down their common side.  At that point, I was manipulating a workpiece that was about 82" long and 165" wide, so I needed to employ a lot of clothespins and patience to get it done in a controlled manner.

(7) I repeated the general sequence above for the other half of the project - the other compound panel that consists of three widths of noseeum fabric, rip stop borders, etc.

(8)  You must periodically stop and reality-check your half-finished workpieces against your vehicle.
Here I've got two side panels attached to their center panel and held in place using office binder clips and a few magnets, just for measuring purposes. Obviously a bottom trim piece will need to be added and I will describe that further down. 
In that photo above, you can also see a hint of another reason why I chose to DIY this job instead of trying to buy a product off the shelf.  Notice that the noseeum fabric is bunched up next to the body of the van.  That's because the awning is not fully extended.  And why isn't it?  Look at the bottom of the noseeum fabric.  It's blowing in the wind (in fact, I tried to temporarily weigh it down for this fitting by clamping adjustable wrenches on its bottom edge).  We have noticed that the awning becomes unstable even in light winds, if it is fully extended.  But we can achieve a much more secure configuration by electing to keep it only partially extended.  Therefore, I needed a screen that would fit both scenarios - no winds at all, and light winds - and there's no commercial product on the market that would do that.
Here's a visual way of saying the same thing. 
In other words, I had to customize this screen for a range of awning extension configurations, not just a single configuration.  You'll see how I did that below, and it invokes a very important tailoring principle.  If you look at old pictures of tailors servicing their clients, you never see them sewing a workpiece in a vacuum.  You always see them fitting the clothing directly onto their customers.
Like this.  Random pic from the internet.
The same is true of camper vans.  You can make all the measurements in the world that you want, but this process works best if the customer (the van) is fit in real time, step by step.  So what I ended up doing over and over again was putting the partially-finished screen on the awning, so that I could complete it iteratively.
Of course, this piece of tailoring did not simply hang passively and stay still the way a pair of pants might do on a gentleman.  There's always at least a breath of wind outside, if not an outright breeze, and I had to weigh down the unfinished bottom edge using a variety of available garage tools, including C-clamps, welding magnets, and this adjustable wrench. 
Every time I located a spot where a tie had to be placed, I added a safety pin as a temporary marker.  On a large item such as this screen, a safety pin is more effective than a straight pin.
This is what I looked like during this stage of the project - wearing one of my husband's crappy old baggy T-shirts because our heat index was near 100 degrees F, with all these pins and stainless steel clothespins stuck to me.  Those stainless steel clothespins will be used to augment the paracord ties, and on the internet they are called, "30 Pack Wire Clip, Durable Stainless Steel Clothesline Clothes Pins".  I'll talk more about them in an addendum to this post.  
Once I got everything pinned, I would stitch pieces of paracord in the locations they were meant to be.  I burned the ends with a Bic lighter, but if you do this, be mindful that sharp pieces can remain on the burned ends.  These could snag the no-see-um fabric if not smoothed off. 
In that photo above, you'll notice two ties added to the seam, one above the other.  That's because the upper tie is the one that would be used if the awning were extended to full length.  That tie would then fall at the intersection of this cross-bar.  In that photo, the awning is in its somewhat-retracted position.

Now, a word on that orange paracord I'm using for the ties.
There's no law that says that the ties have to be made of orange paracord - some people would prefer a more subtle approach.  But number one, I have vision limitations that make it difficult for me to see black on black, so using a dark color would hinder my ability to quickly locate and tie off the screen in every place where that were needed.  And number two, using the orange made the screen look very automotive (channeling the phrase "looking very Presidential") - it causes the T1N Sprinter reflectors and turn signal light covers to visually pop.  Personally I like it, but it's a matter of taste.  Plus, orange at the lower level of the tent stakes says, "Don't kick me."

I laughed when I saw that picture above because the reflection of my bare feet is visible in the paint next to the rear turn signal.  God bless Houston - it's almost always hotter than hell.  We rarely do any project with shoes on.  I even cut and de-burr metal while barefoot.  
"Fitting to the customer" allowed me to verify that the center strip of neodymium magnets did, in fact, function as I designed.
I think this is more convenient than a zipper.  Don't worry - those neodymiums will "find" each other if the two halves of the screen are brought in proximity to one another.  That is exactly what neodymiums do best - they "find" what they want to stick to.
This next part is difficult for me to put into words because it's a non-verbal brain thing.  Because I was fitting this for multiple awning extension lengths, there is excess fabric adjacent to the body of the van.  That has to be managed somehow.  I did that by setting it up so that the excess could be folded back over and would meet the first vertical seam in the no-see-um fabric, such that I could tie it off neatly there.
And the next obvious question is, "Well, how did you arrive at that measurement?"  I don't have an answer.  It's a nonverbal spatial thing and I "just did it" without consciously thinking about it.  It's was just a natural derivative of this whole iterative process.  
By the way, here is now I anchored this pair of screens to the body of the van.
LOVE these "Master Magnetics 07580 Magnetic Hook with Rotating and Swing Hook, 1.47" Diameter, 0.54" Thick, 65 Pounds, Black"  They have a rubberized back side so they won't scratch the body metal.  And they are extremely strong. 
Other side of the awning, tied off to the magnet.
(9) Moving on, once I began to refine the fitting in the near-to-end phases of this project, it became possible to verify the bottom trim configuration.  Here you can see one of the two mostly-completed workpieces with the deeper (next to the van body - remember, the awning is sloped) section of bottom trim placed for measuring purposes.  Remember too that, because the awning will be extended variably, this is not an exact science. There is not one single slope configuration to be fit, in other words.
You can see my increasing problem.  Even folded over, the panel has now outgrown my kitchen.  At this stage, it's about 13 feet long and is about to become around 7 feet deep with the addition of the bottom trim.
Don't be surprised if errors get introduced during this massive process.  Such was the case with my effort, where the two panels ended up not being exactly the same lengths, which was important because of the magnetic center closure.  They had to be consistent.  So this predicament caused me to empty half my great room of furniture so that I could lay them out together, one on top of the other for comparison purposes, and make final adjustments to the bottom edge.

And finally, the long-awaited money shot:
There she is - Miss America.  With two REI camp chairs for scale.  
Just as importantly, here's what that money shot packs down into:
Hard to believe that's right around 175 square feet of fabric stuffed into that laundry zipper bag.  It's the size of a small pillow and weighs 2.0 pounds (I'll discuss the stakes and clips in more detail in a subsequent post).  A similarly-sized device crafted out of conventional mosquito screening would be many, many times this size. 
A few words of wisdom for anyone who might be dumb enough, er, ambitious enough, to take on this type of massive project.

  1. Take your time.  It's more work than it looks.  I did mine in stages, across blocks of time in three or four weekends.
  2. Have patience.  Each individual seam is up to 13 feet long, and these are tent seams, so they're really twice as long as that - 26 feet each.  Take a break and watch TV if you get burned out. 
  3. Be methodical.  Inch by inch, life's a cinch.  Use clothespins to control the workpieces, or some other method, so your efforts won't start spiraling out of control.  
  4. Don't sweat the small stuff, and on a project this large, it's all small stuff.  Nobody is ever going to notice an inch thrown here or there on a workpiece that consists of two pieces each thirteen feet wide!  Forget about imperfections and just sew as you go.  The one exception obviously is the neodymium frontal closure.  Those magnets have to line up fairly well, as I described above.

In my next post, I'll talk about making a couple of accessories for this screen, including a "skirt" to go around the van's ground effects to stop mosquitoes from entering the enclosure by that route - from underneath the van.  In the mean time, happy #vansizedsewing!!
Rather a propos given that the Airstream Interstate is often compared to the space shuttle. 

Wednesday, May 24, 2017

ASIDE: DON'T SEE LIKE A TOURIST

I'm writing a non-van-related post here partly because I'm stuck outside the Halifax Nova Scotia airport with my return flights to Houston delayed at least 8 hours.  This type of delay has been so common in our experience - during one memorable year, our Houston to Halifax flight-related vacation delay amounted to FOUR DAYS plus seven hundred dollars in extra expenses that United Airlines refused to refund to us (our flight cancellation occurred at the halfway point which was Newark Liberty airport and so we were stuck there paying exorbitant hotel and taxi fees) - that it was largely the original inspiration behind our Airstream Interstate purchase two and a half years ago.  My best-case door-to-door travel scenario right now is 18 hours, and it very well might be longer (and often is... EDIT:  It ended up being 22 hours on this day).   With air service being that bad, why not drive?  It's only 40 hours up here by road, not to mention one hell of a lot cheaper, especially if you Crackerdock along the route.

Anyway, do you ever read blog posts about someone's travel adventures only to end up with an urge to slap the blogger?  They shallowly oooohh and aaahh about the exact same crap that every other tourist sees, and you end up concluding, "There's ten minutes of my life that I'll never get back" because you regret taking the time to read the post.

I don't want to fall into that category, so what I'm going to do below is present a photo tour in a non-stereotypical way.  So maybe it's still a time-waster, but at least it's not cut out of that same tired cloth.  A little less mindless tittering, and a little more perspective and magic realism, perhaps.

The most rewarding travel is all about seeing the more subtle details that many other people miss.
Like the color of the water, for instance.  The northeastern coast of Cape Breton was experiencing unusual gale-force winds, to the point where many lobster traps were destroyed and valuable pre-spawning lobsters killed.   That part was a bad thing, but the same conditions turned the seas a shade of sapphire that I have rarely seen.  This is the coast at Louisbourg with no photo enhancement.  

And it made a particularly vivid juxtaposition with the colors of the land. 
Including the lichens. 

I grew up 20 miles from Fortress of Louisbourg National Historic Site, so its novelty wore off for me about half a century ago.  But choosing to see it on opening day 2017, which happened to coincide with Victoria Day, when it was candidly exposed and not really ready for seasonal prime time, was a new experience.
It only opens during the tourist season, and winter damage from that wild, wild sea was visible everywhere.  The area experienced an unusually late spring, so pre-tourist repairs were behind schedule.  In this location, the sea had blasted through one of the canon portals and scoured out the base of it.  Discombobulated lumber was scattered everywhere.  
With no animators and almost no visitors present, the photographic opportunities were unprecedented.  The faithfully-reproduced scenes from the year 1750 were vacant and smelled unusually authentic, given that they had just been re-opened after a winter of hibernating under wraps. 
Of course there are no electric lights in the reproduction buildings.  Just an eerie glow of ambient daylight. 

The animators (costumed interpreters) were not yet on the job, but the management staff had loaded in some of the smaller livestock, which was still getting itself oriented.  Some animals were running at large, like this guy in all his typical rooster attitude.
One of the period buildings in the town.
I don't recall another time when I was able to take a picture of the main fortress chapel without having throngs of tourists below.  
On all of our trips to Nova Scotia (where I still have family), we always resolve to do at least One New Thing.  That way it doesn't feel like the same trip year after year.
And this year that one new thing was the Pomquet Acadian trails, some coastal hiking trails situated on a headland in geology with which I am much less familiar (I did my first degree, a Bachelor's in geology, here in Nova Scotia).  The trails are located about 15 minutes north of the Trans Canada Highway, just before the town of Antigonish.  I had to drive by this area anyway, coming back down from Cape Breton to the Halifax airport for my flight. 
Despite gale force winds, it was an interesting time to visit this area, as life was struggling to emerge in late spring conditions that were rather hostile.
Maple leaves start red, turn green, and then end red several months later. 
Buds everywhere.  I don't know what this is. 

I do know what this is - an orchid, which Nova Scotia has in abundance. 
More new growth.  This reminds me of baseball players signalling each others, when they will hold three fingers pointed at the ground.  
I had never seen an ant bed this large in Nova Scotia.  My foot for scale.  When we were children, we called these things "black ants" and didn't fear them as much as the province's bad-tempered "red ants", which use their massive mandibles to bite at every opportunity.    
Black bear scat.  There was a large fresh deposit distributed around the trail, of which this was one cohesive nugget.  It did not stink, suggesting that the bear had been eating green vegetation alone, which makes sense because nothing else is growing right now (when they start varying their diet later in the growing season, it gets pretty pungent).  I've never seen a bear in the wild, but I believe that day will come.  There have been too many close encounters, too many times when I've seen fresh scat, or fresh paw prints, or even smelled a bear just out of sight in the thick woods.  They're everywhere here.  
Maybe she was eating some of these - new ferns about to unfurl. 
Nova Scotia has been hit by a number of hurricanes and tropical storms lately, not to mention northern storms in winter.  Most of the softer (i.e., soil-rich) coast shows conspicuous damage.  
And this location was no exception.  There's that cliff erosion.  
There were bits of smashed lobster traps scattered way back into the coastal forest. 
It almost looks like the cliff-dwelling trees are begging the sea to take them and finally put them out of their erosional misery, as they strain and gesture toward it. 
The weather was extremely unsettled - I picked a good location for the hike because the Pomquet headland blocked some of the most severe winds.  But the view out over the water revealed this ominous blackness at the horizon.  
This area had more sedimentary rocks than many other coastal locations with which I am familiar, but the beach melange was very typically Nova Scotian, combining lithologies from hundreds of miles around.  And how is that possible, you may wonder?  In a word, glaciation.  As I took this picture, I acknowledged to myself that it's no wonder that so many people can't visualize climate change being a largely natural process - they didn't grow up as I did, surrounded every moment of every day with the incontrovertible and overwhelming evidence of the extraordinary magnitude of glaciation, and the fact that the natural sea level varied anywhere from 246 feet below to 330 feet above its present level (PDF link).  That historical climate change, and the glaciation triggered by it, is the primary reason why Nova Scotia ended up with the natural beauty that it has, which, in turn, is why it attracts over $2 billion per year in tourism revenues, despite being a small province with a population of only about 943,000.  Most of those tourists walk upon shores like this one with no clue as to the significance of what they're actually seeing.  We have poor public science education to thank for that.