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Wool Insulation Questions

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Old 01-08-2022, 11:48 PM   #1
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Default Wool insulation questions

Hello there - I'm new here and I'm sure this topic has already been covered many times before, I have read a few old posts about it, but I'm wondering if any of you who have tried this in the past have any current advice for insulating your yurt with wool.

I have a new 24' Pacific Yurt under construction that is replacing a 30+ year old canvas-lined Keyman Jim 20 footer that my husband and I have been living in (in addition to a 16' Pacific Yurt as our bedroom) for the past several years. In an effort to solve mildew problems and the issue of things freezing over during the night in the winter when the fire went out (drawback to having two yurts to tend), our new yurt will have thermostat controlled air-to-water radiant floor

heating

and a high-quality woodstove as well (we are thinking a Jotul).

The yurt has an acrylic coated polyester fabric side cover, and reflectix

insulation

with a polyester liner (it's one piece). The radiant floor & platform is well insulated. My husband purchased loose natural wool

insulation

as well as 2 inch thick wool blankets (not felted), and the idea is to do blown-in insulation in the roof between the rafters (covered with a white polyester mesh) and the blankets for the walls. The wall insulation is the most confusing, because our yurt is already constructed and we were also worried about it being exposed to outside

moisture

if it was put behind the reflectix/liner and compression if it was behind the lattice - so the plan is to create very thin plywood-framed (to keep it from stretching/slumping) wool blanket panels along the *inside* of the lattice, and probably cover that with wooden paneling. The wool is white and beautiful and I don't mind the look of it exposed, but I worry about it being hard to clean if it weren't covered with something. And I also wonder if we need a vapor barrier underneath the paneling? It's confusing trying to figure out the layers and what order they should go, and how to make sure it can breathe. The idea has also come up to just do the roof insulation and forget the walls, since the R-value wouldn't be that big of a gain anyway for the amount of work it would involve.

Honestly the lack of insulation is one of my biggest complaints with yurt life, so if we could fix that issue it would be amazing, but I am worried about this wool becoming a mold disaster. We have a separate bathhouse so won't be bathing/showering in the yurt, but we do have a little dishwasher and will be cooking in it. We are considering installing a kitchen vent in addition to the open-able

dome

. We are in Northern California, in the Sierra foothills, and we get rain and some snow in the winter but overall our climate is pretty dry and it rarely gets below freezing.

Thank you for any pearls of wisdom you might have!

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Old 01-09-2022, 02:51 AM   #2
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Default Re: Wool insulation questions

If you can do a through-the-wall vent, that would probably help a lot! Of course get the openable

dome

. In fact, that shouldn't even be optional.

When you say "Northern California" that is a big area.. Are you in the part that gets a lot of snow or?
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Old 01-09-2022, 10:45 AM   #3
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Default Re: Wool insulation questions

Hi Jafo! We are in the Sierra Nevada foothills, in Nevada City. Elevation is about 2500 ft. We are just on the snow line, and while just a half hour drive up hwy 20 there's lots of snow, we typically get only a handful of snow days each winter, usually around a foot or less. We did however just have a big (to us) snowstorm with 2-3 feet that caused havoc with downed trees and power lines, folks around here were not prepared for it!

Glad you think the kitchen vent would help avoid mold issues. Yes, we have the openable dome too!
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Old 01-11-2022, 09:56 AM   #4
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Default Re: Wool insulation - air gaps & layers!

Hi,


I'm also asking similar sorts of questions just now so hope it's helpful to add mine to the mix to get some discussion flowing here!


I have a thermal mass rocket stove with at least 6 meters of pipe running through a stone / cob double bed inside my 15ft yurt. It's a massive heat source for the small space but I haven't insulated yet (just have a 12oz cotton canvas cover)


I'm wondering how much insulation I'd need, and what's the best source. I also would like to go with sheep wool if possible.



I have access to 5mm thick wool felt @ around 4 euros per m2 - very cheap compared to most felt in Europe!


I'm wondering, if I add two layers of this, with an inch air gap in between - surely the air gap would also act as a free insulation layer in itself, saving me on adding extra layers of felt.


It also occurred to me that even thin cotton sheets (e.g. 2nd hand bed sheets) in layers with air gaps in between would add to this effect, and may look quite attractive if done in the right way.



If anyone knows about this concept of using 'layers' rather than just one thick insulation sheet, ( in the same way we do with our clothing), it may be very helpful not just to me, but also to the original author of this thread.


Many Thanks, and Happy New Year All,



Charlie
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Old 01-11-2022, 10:55 AM   #5
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Default Re: Wool insulation questions

I haven't done it. I know zip about air gaps in yurt felt. I do have an opinion about felt as insulation though.

Felt is the traditional insulation on Mongolian yurts, and other nomadic tipi dwellings used by northern People. In general an internal liner cover is (sometimes) placed over the frame, and then heavy felt, then the exterior cover. Never seen any air gap that was deliberately placed.

Seeing as how thick felt has been 'the' nomadic tent insulation for untold generations, I'd give two layers a go. That will get you near a half inch, which I would think would be plenty in a 15' yurt. I had a 16' yurt with no insulation, just a canvas cover. Two layers of felt would have been very nice this time of year.

Since you have a mass heater instead of a typical wood stove, you could try one layer. Experience would tell you whether a second is needed?

Trying to gap between the layers? Never seen that on any video. My guess it would be a hassle when erecting the yurt, but that's just a guess. A second light 1/4" thick layer would be easier to place by yourself. Getting the second layer on might be easy. Or not. Beats me.

If I had the money and that yurt was my home, I'd go for two layers. Good luck.

Last edited by Bob Rowlands; 01-11-2022 at 11:02 AM.
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Old 01-11-2022, 02:06 PM   #6
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Default Re: Wool insulation questions

Thanks as always Bob for your insightful input!


My idea for two layers would be to put one layer each side of the yurt frame. The inner layer wouldn't immediately have anything to hold it up - that would have to be done with additional wooden bats, string, or even some invisible ties within the air gap between the two layers. But yes, I might start with one layer, then see how it goes.


I'm quite pleased with how much heat the rocket heater holds and provides the yurt without any insulation already - if fired up for a few consecutive days that is!
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Old 01-11-2022, 09:47 PM   #7
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Default Re: Wool insulation questions

Heat radiating off thermal mass is very cozy in a yurt on a bitter cold day.
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