What is a SIP (Structurally Insulated Panel)? Should I use SIPs?


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Last week, we looked at a discussion among GCs about who pays to fix a problem during construction. This week, our focus is building a home with SIPs (Structurally Insulated Panels). We'll learn why they are used and how they are installed.


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What is a SIP? Should I use SIPs for my project?

We often think of homes being built with lumber, like 2X4s. Lumber is reliable and easy to manage, but it's not the only way to build a home. Many homeowners are opting for a building system made of manufactured panels that serve as the home's support and insulation. These are Structurally Insulated Panels or SIPs.

You can think of SIPs like interlocking ice cream sandwiches. They often have wooden sheathing on the outside and insulation on the inside.

There are many different types of panels, but they all have a few things in common:

  • They are produced in a factory using precise computer controls
  • They serve as both structure and insulation
  • They are delivered to the site and installed panel-by-panel

SIPs are similar in price to traditional construction materials and can reduce construction labor costs and waste. Because the panels are fabricated so precisely, they are known for increasing the efficiency of a building by making it more airtight, which relates to lower heating and cooling costs.

The Process

One of the amazing elements of using SIPs is how quickly the house's structure is built. An entire house can come together in a couple of days.

The pre-fabricated panels arrive on the building site ready to be installed.

They are like puzzle pieces. Each one has markings that ensure correct installation.

A crane is used to move the panels into place.

This is a two-story SIP wall being put into place.

Keep in Mind

SIPs are not for every project or homeowner. SIPs work best when the architect, GC, and structural engineer have experience in working with them. A SIP installer may do the installation and then hand it off to the GC. A mutual understanding among the team helps ensure that the overall home is designed and constructed with SIPS in mind.

Homeowner Perspective

Build Livable contributors Jon and Mari provided the images above and had this to say about their experience:

We chose SIPs for a few reasons. In terms of construction, the panels are made from affordable materials and go up really quickly. The framework of the house can be constructed in a couple of days. We hoped that this would save us a lot of money compared to paying a team to do months of framing work. Because they’re built with such precision, they make the house tight and have a really high R-value. Over a very hot summer weekend, they kept the house nice and cool. In a world with more extreme weather, it will apparently take very little to heat and cool the place!
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On the other hand, because our SIPs don't have channels for plumbing or electrical, all of that will have to be done externally. This limits some of our choices about placement and light fixture options.
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If we had to do it over again, we might choose more traditional framing for our project. That’s because there’s more leeway and margin for error. With SIPs you are kind of locked into the design because the panels have all been manufactured to fit together. It’s much harder to tear down a wall and rebuild it like you can with a wood frame.
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Anytime you choose a novel construction method you need to be well ahead of the calendar so you can make sure the stage is set. If we did use SIPs again, we’d be sure that everyone on the team was on the same page regarding what to expect.

πŸ‘‰ We cover this subject and much more in our Custom Home Construction Navigator Course.

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Did you find this helpful? Do you have ideas for future issues? Reply to this message or email me anytime at lee@buildlivable.com.

Lee LeFever, Build Livable​


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