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Straw Bale What They Don't Tell You!!

 
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So we built a straw bale building about 10yrs ago (as practice) followed by a straw bale house. All permitted etc non load bearing yada yada. There’s a lot I know now that I wish I knew then and somethings that have changed drastically (like price associated with farming practices).

Bugs and mice - I gorged on straw bale books videos all info I could find before building. All the books talk about how glorious straw is...bugs don’t eat it, mice don’t eat it, it doesn’t burn, great insulation etc. Well most of that is true...bugs and mice don’t eat straw but they love to live in it!!! Mice are a constant problem they eat holes right through the plaster and it’s not like tire going to beat off the most labor intensive wall finish on the planet to get to them. So your left with only trapping options while mice are chewing up and pooping in your walls!!! Is this different than a “normal” house? We’ve had more mice in our Strawbale house than anywhere we’ve ever lived. Now BUGS all manner of bugs make homes in our house the good bad and ugly. Bumble bees being the most visibly destructive I’m going to try to include a picture. Yellow Jackets being the most dangerous (we had 6 best in our walls last year which you can’t get too and all normal options aren’t effective). The annoying silver fish, moths etc (we could get over those)

Price - When we built our house straw was abundant and $2 a bale when bought in bulk. I’m a plumbing contractor who buys straw frequently the last few years it’s been around $6 a bale which when combined with all the other downsides doesn’t make it a viable building material to me unless you don’t value your time at all...because you will spend mountains of time plastering. It’s by far the most labor intensive building method I’ve ever used I can only imagine cob being worse.

Resale - All my kids will be out of the house soon and we’ve considered selling...well forget that unless you’re going to owner finance. Banks won’t loan money on them to you or anyone else. Appraisers don’t know what to do with them. So now I’m stuck with the biggest investment of my life in money and time and I can’t get my investment back out of it. Renting isn’t a good option because you have to me conscience of things in a straw bale house that doesn’t matter in regular house and renters don’t care about those things.

Insulation - Our house is tight with all insulated windows etc and my power bill in summer for ac and heating load is as much or more than anywhere I’ve ever lived in conventional housing. We burned about 12 cords of wood a year in a mild North Carolina winter. If you think you’ll heat your house with a candle or cool it with a fan you can forget that.  
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Bubble bee damage thousands of 3/8” holes
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pioneer
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Thanks for posting this.  I think for alternative housing to be taken seriously and to expand, it's important that people are realistic about the drawbacks as well as the advantages.  I appreciate you posting your experience.
 
pollinator
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Second that, thanks for posting.


Would love some more details; what sort of plaster are the bees/insects getting through?

If you were to do it again, do you have any ideas about addressing these problems?

What is your roof/ceiling insulation like?
 
pollinator
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Location: San Diego, California
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So sorry to hear this David, that's terrible news; it sucks to have such an emotional, time-consuming, and financial investment not pan out.  

Maybe there's something we can do to help you diagnose/remediate this issue, or at least help others to avoid the pitfall traps you've identified? (and I'm sorry if any of these questions are patronizing - they are not meant to be)

If you'd like, please tell us about:

Your ext. and/or int. plaster recipe?

Did you account for house orientation, prevailing winds, window placement, shade trees/structures, etc for passive cooling/heating during design/construction?

What is your roof material and insulation? Foundation type?

Thank you for sharing your experience here, and I hope we can help!

 
Dustin Rhodes
pollinator
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Oops, I was posting same time as you, Dillon - sorry for the duplicate questions!
 
pioneer
Posts: 149
Location: California Coastal range
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Have you figured out how the mice got in ?  Detailing is so important.  We have amazing rats here,  I have them under control at this point so out of the main ( standard stock frame)  house but I sometimes get them in the ( standard stock frame) garage that has an ill-fitting door.    The back wall of the garage is light straw clay with thin earthen plaster with a lime wash, this is part of my retrofit studio.  They never try and chew on it.  They don't know there is straw behind it or a nice warm studio or food and the lime washed plaster is of no interest to them.  Now I could see them making quite a mess if they somehow got into the ceiling of the studio and there was a crack showing the straw in our walls.  

Did your mice get in by chewing thru your walls or via an opening for plumbing or wiring ?  Did they get into the ceiling or crawl space and then find the walls ?  I just wonder if it is due to the bale walls or if it was the kind of detailing that could let them into any house.  It definitely would be harder to open the walls compared to drywall that you can take off.  But, even with drywall, we don't take the walls apart to get the rats.  I had rats in the ceilings and walls in the main house here when I first moved in and they rip apart fiberglass insulation and drywall to make their nests, but they cannot eat it, just as you mice cannot eat the straw, so they have to leave for food and water.  Trap or bait and kill them all and seal up how they got in - in my case it was the crawl space under the house and plumbing openings

Just retread you say they have chewed thru plaster, to get in or to get out of the walls or maybe it is too hard to tell ?  I am just trying to help you fix the issue.  I would kill the.  Crawl thru every spot I could and adress all cracks and openings and junctions nail on tight wire mesh, spray foam plumbing penetrations and if I thought they were chewing thru my exterior plaster -  I would add to it with a lime plaster layer
 
Posts: 33
Location: Corinth, KY
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Is this a normal thing for all strawbale homes? I was thinking of doing a hybrid of cob and strawbale.
 
Sue Reeves
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Diane Maldonado wrote:Is this a normal thing for all strawbale homes? I was thinking of doing a hybrid of cob and strawbale.



I have never heard of this complaint before.  But we can all learn from this and get better at keeping it from happening as well as improve this families situation
 
David Wright Nc
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It’s been many years since I did any plastering but if I remember correctly the earthen plaster exterior is mostly sand, a little clay (just enough to bind but not crack, straw of course, and I think a small amount it type s cement but I can’t remember why we added that to the recipe. The ration was probably 5-3-1 but that’s a guess at this point. The interior plaster is gypsum and and sand (literally Sheetrock mud and sand which I’m sure some of you don’t like but it’s durable affordable and went on faster and better than anything else we tried and we were just ready to be done with it). We built the house completely by ourselves I paid no one to do anything...which is not always a good choice by the way. I’ve got places which I’ll take picture of where mice have made holes just right out the side of the building with no Rhime or reason why it’s there (yes it came from inside the wall to outside.  
The house is oriented about 15 degrees off direct southern exposure to the front of the house. Dug into a hole that knocks most of the wind off of it (we considered an earth ship originally but could get by code enforcement. Shaded in summer. Shed roof design with spray foam insulation made from soybean oil Sprayed to meet r -30 requirements, black epdm roof painted white. It’s on a 6” insulated slab with raidiant floor heating that heated by a wood boiler with rocket stove for back up...rocket stove are another rant for later. I’ve built several based on what I learned here. I still have one but I tore out my rocket mass heater last year...I’ll take a restyles old wood stove any day. Oh the house is two story which tripled labor I can’t tell you how many hundreds of 40lb buckets of plaster we pulled up scaffolding with ropes. I am glad I did it when I was younger.
 
pollinator
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I have yet to hear a good reason as to why it is preferable to build out of straw bale than, say, rammed earth.

As I understand dewpoint and how heat is transferred through different media, the best option in a temperate climate is to insulate on both sides of the structure. For my money, that means nice, thick rammed earth walls with insulation inside and out, preferably an insulation that is dense and inedible, and sealed overtop with a waterproof earthen plaster.

Nothing for vermin of any kind to eat, no space in which they can nest, and a sandstone-like mass around two feet thick to burrow through to get inside; easier to find other accomodation.

-CK
 
gardener & author
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I'm sorry to hear you've had this bad experience.

Can you remember how thickly you did the earthen plaster on the outside?

A while ago I was looking into building a strawbale house with a strawbale building company. They build a lot of strawbale houses and use around 5cm/2 inches of cob as the render/plaster. I wonder if this extra thickness stops animals from nesting in the bales?
 
Sue Reeves
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Ok, you said the mice ate the hole thru the plaster from the inside, so from the inside of the wall ?  Yes, I have seen this with rats they will chew thru anything to get out.  The real issue is how they got into the wall in the first place.  Do you think it is probable that they got in the way they would in any other type of building ? This would mean via an opening into the wall for plumbing or electric or from where the wall meets the under floor or over the ceiling areas of the structure ? How are these areas detailed ?
 
Dillon Nichols
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Chris Kott wrote:I have yet to hear a good reason as to why it is preferable to build out of straw bale than, say, rammed earth.

As I understand dewpoint and how heat is transferred through different media, the best option in a temperate climate is to insulate on both sides of the structure. For my money, that means nice, thick rammed earth walls with insulation inside and out, preferably an insulation that is dense and inedible, and sealed overtop with a waterproof earthen plaster.

Nothing for vermin of any kind to eat, no space in which they can nest, and a sandstone-like mass around two feet thick to burrow through to get inside; easier to find other accomodation.

-CK



To me the appeal is that the strawbale is reasonably insulative. It's uncommon amongt the common, DIY-friendly green methodologies in that regard. Light-clay straw/chip, hempcrete are other options...

Rammed earth in your example is not really replacing the strawbale; the unspecified dense inedible insulation is!

Interested in more discussion(another place?) of the pros/cons of insulation on inside of walls... the upsides that I am aware of don't really seem worth it to me..
 
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Once I got rid of mice I had no problem. I have exposed straw right now and still no mice problem. I did have problems at first. The sooner you can get it plastered the better. My problem has been birds. I’m slowly getting a hardware cloth under the plaster, but till then. I live with sparrows and starlings. My buddy had a kestrel living in his strawbale house.
I knew about the loan thing. I remember reading about it when I was first considering this, but I have less than $20,000.00 and no mortgage. After the 2008 crash I would have lost my home if I had a mortgage. The only two other people I know manage to sell their strawbale homes for a substantial profit, just need to find an enlightened buyer.
 
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I am with Dustin on this, something is dramaticly wrong.
Was lime used in the plaster, because cement should never be used, it creates moisture problems.
Lime helps make the wall unpalatable to mice, ETC along with sharp sand
Explanation about mice and strawbale

Is the plaster 50mm thick

Is the ceiling actually insulated

In Australia, I have never heard of a bank not financing a strawbale house

 
gardener & author
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Chris Kott wrote:I have yet to hear a good reason as to why it is preferable to build out of straw bale than, say, rammed earth.

As I understand dewpoint and how heat is transferred through different media, the best option in a temperate climate is to insulate on both sides of the structure. For my money, that means nice, thick rammed earth walls with insulation inside and out, preferably an insulation that is dense and inedible, and sealed overtop with a waterproof earthen plaster.

Nothing for vermin of any kind to eat, no space in which they can nest, and a sandstone-like mass around two feet thick to burrow through to get inside; easier to find other accomodation.



I agree! I'm writing this as I sit in my rammed earth home, and until last year I lived in a campus of rammed earth and adobe brick buildings for 25 years. We have a climate with winters about as cold as northern New England. Two-foot thick rammed earth walls have proved to be both insulating and thermal mass. In our high desert environment, with passive solar design, it is just about enough. At the school it was a little colder indoors than I would have liked during Jan and Feb, and in my new house this past winter I used a little portable electric heater in the evenings in Jan and Feb. Other houses here are running their wood-stoves from October to March or April.

To be honest mice have been known to dig a tunnel through our rammed earth walls, but they don't seem to nest in there, or love it, or proliferate. Our tailoring-waste insulated ceilings, now, were another mouse heaven. But a friend of mine helped dismantle a year-old straw-bale wall in the US, and found the whole interior hollowed out by happy nesting mice.
 
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