Phenning SIP Residence Leavenworth WA

Location: Leavenworth, WA

Project Information

Project Type: Residential, > 3,000 sq. ft.
Manufacturer: Extreme Panel Technologies
Builder: Sirius Builders
Design Professional: Stefan Swoboda Architect
Year Built: 2016


High Performance: No
HERS/EUI Index Score:
ACH50 - Blower Test Results:
CO2 lbs./sq.ft./year:

Went from floors only to exterior walls and roof in two weeks. It was great having the second set of engineering eyes look at the plans and make suggestions to improve the overall ease of assembly. The long term savings in energy was also a consideration in the decision to use SIPs.

This was not a simple build. One of the requirements to the architect was that the design needed to be set back into a hill and not a two-story pretentious build. There are two autonomous foundations for the house that are on two levels with about an 18-foot vertical separation between them and connected with a bridge. The lower shop ceiling area had to be built up to the level of the upper foundation. There was also a 37-degree angle that the house had to make where the "bridge" and the main foundation met. With the SIP roof and use of some significant glu-lams, the shed roofs used on the bridge and main house sections had no issues exceeding the snow load requirements. Cantilevered glu-lams carried the upper house and deck load which included the support of a heavy spa.

Owner Testimonial

Owner Comment: "SIPs are just starting to get a toe hold in Chelan County. Having some of the cheapest electricity in the US, there were many who down-played the added efficiency of the panels. These same people are now a bit envious of our electric bill and how the estimated break-even point between savings on our utility bill and the additonal initial cost of the SIP panel is only three years. There are also not many builders in the area who were SIP panel proponents other than using them for the roof. In our case, discussions with Extreme Panels sold us on the advantages of using the SIP panels, so choosing the architect and builder was an important step. It's imperative that they have a solid relationship with the panel manufacturer. Both of them made numerous comments on how well the panels were made and how knowledgeable the customer service reps at Extreme were. Having the bible that Extreme sends detailing SIP construction was a really good thing to have." 

Additional Testimonial

Regarding the shop -- "A full three-bay shop that is wired for 115/220VAC all around making welding or anything else anywhere in the shop a simple thing. One bay has a lift in it so I can easily pursue the hobby of rebuilding old cars. Plenty of light from windows and light fixtures along with a 7-foot in diameter Big Ass fan that totally lives up to its hype. The floors have radiant heat and there is a split, as well, for any extra heat and summer air conditioning. It is the shop my father would have loved to have!!"


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