Insulation - Dow TUFF-R

Insulation was the other decision to make and I have opted with a Dow TUFF - R foam board.  This seemed to me to be a pretty easy to work with material which I could cut down to size and fit into the openings in the wall from the inside.  There are a lot of these openings and it will involve a lot of cutting and some minimally expanding foam filler for the edges.  I have gone with a 1" thickness which may be on the thin side given that it gets pretty cold up there.  I'll be heating with electric and think that once I have all the siding on, this will be sufficient...If I am wrong well, then others can learn from my lesson.  I think that they have a 1.5" as well which might have worked too.  The plans call for 8 sheets of this to do the job.  We'll see if that's enough.  
What I don't want to do is fill in the pockets in the wall with too thick a panel that will make electrical and running water lines more difficult.  We'll see how it goes. The wall is ultimately made up of a whole bunch of layers with a fair amount of air/hollow space as well.  This has always been referenced as such an important element with tiny houses since condensation is really easy to have and difficult to get rid of.  Depending on where in the wall the condensation occurs, it can really cause big problems.  That airspace is crucial for the house to 'breath' and it is actually also an effective insulator as well since I saw some video recently on how they keep that indoor ski slope in Saudi Arabia insulated.  One of the secret weapons in doing that is a 6' hollow space between the roof of the building and the roof of the slope.  I'd link to it here but currently too lazy to do so.  May add in later.  What I will add in is a pretty meaningless screenshot of the the insulation material :)
Update no. 1: So the more I think about it and look around, it doesn't seem like 1" of this stuff is going to be sufficient.  I'm just dreading all the additional work with routing wires and plumbing if the wall cavities are fully filled in.  Kind of on the fence.  I keep hearing that tiny houses are really easy to heat and if you cook a pot of water the house will be both warm and humid.  My particular location does have some pretty harsh winter weather but I'm also not averse to heating a bit more when I'm actually there...which won't be all the time.  Any advice for me?



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