Dense Packed Cellulose

This week has seen another big milestone being hit; the insulation is being blown in!  One of the biggest criteria in building a Passive House is to ensure that there is enough insulation in the exterior shell of the building (walls and attic) to lower the amount of energy that will be required to heat the building.  In our case the magic numbers according to the Passive House Planning Package (PHPP; the software used to calculate all the PH requirements) are R60 for the walls and R70 for the ceiling.  We are meeting these requirements using dense packed cellulose.  One of the big things that we love about cellulose is that it is made out of mainly post consumer newsprint.  Thermo-Cell (, the company supplying our insulation, indicates that the product we are using, Weathershield, is made of 87% post consumer newsprint!  I love recycling!!  Cellulose also has lower embodied energy (energy required to manufacture) than other types of insulation.

The insulation has been delivered and Jessy, a representative from Thermo-Cell, has been on hand to teach the crew how to install the cellulose to the property density in the wall cavities.  In all there are 500 bags of insulation; at 25lbs per bag that is a LOT of insulation!!  We are going to be warm and soundproof!!

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Delivery time! The truck with the 500 bags of insulation and the blower to install it.

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Teaching time… a strong fabric (sorry, I’m not sure what it is) has been stapled to the studs to hold in the insulation. With this in place you can see the insulation and feel the density of it. OSB will be going over this when the insulation is complete.

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The first four cavities complete.

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On the first floor the South wall is complete and most of the East wall. All of the holes are taped up after the property density is achieved.

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The outside corners where the Larsen Trusses meet prove to be more challenging. Holes need to be cut in the OSB to allow for the insulation to be blown in.

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Another view of a corner.

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