Building with SIPs

Building with Structurally Insulated Panels (SIPs)

Although he will occasionally construct a “stick built” frame for a project, Andy prefers building with SIPs. They are the best option available in building materials today.

SIP homes typically save their owners up to 60% on their heating and cooling costs, are far superior in structural strength/straighter walls, are built faster and with less waste because they are pre-cut, you have reduced labor costs and less waste.

Above all, they are environmentally responsible and allow you to “Build Green” and qualify for energy efficient mortgages and tax credits.

FACTS ABOUT SIPS

What are SIPs?
SIPs are high-performance building panels for floors, walls and roofs in residential and commercial buildings. Each panel is typically made using expanded polystyrene (EPS), or polyisocyanurate rigid foam insulation sandwiched between two structural skins of oriented strand board (OSB), but other surfaces are also available to meet your needs. The result is a building system that is very strong, predictable, energy efficient, and cost effective.

What R-values do SIPs have?
The R-value of a SIP varies depending on the thickness and type of foam core used. According to a study by Oak Ridge National Laboratory, the “whole-wall” R-value of a wall with a 3-1/2″ EPS core is 14compared to 9.8 for a 2″x 4″ wood framed wall insulated (“stick built”)with R-11 fiberglass insulation. When the performance of the whole wall system is considered, SIPs perform better than traditional systems because they are manufactured in a controlled environment characterized by uniform fabrication of components without gaps or air pockets. They are also designed for efficient field installation that reduces air infiltration, and there are few thermal breaks or penetrations in the panels that are typical of wood frame construction.

How do SIPs compare in costs?
Building with SIPs generally costs about the same as building with wood frame construction, when you factor in the labor savings resulting from shorter construction time and less job-site waste. Other savings are realized because less expensive heating and cooling systems are required with SIP construction. And when you add in the long-term benefits of reduced heating and cooling costs for years to come, there is really no contest.

Why do SIP homes outperform others?
SIP buildings are vastly more energy efficient, stronger, quieter, and more draft free than other building systems, such as stud framing with fiberglass insulation. Fiberglass is sometimes used for furnace filters because air moves through so freely. Rigid insulation is used as solid component insulation in almost every industry for its inherent efficiency and lack of air movement. These attributes are built right into a SIP building. Less air leakage means fewer drafts, less noise, lower energy bills, and a much more comfortable indoor environment.

How much more energy efficient are SIPs?
You can slash energy costs by up to 60%. Because SIPs create a tighter building envelope than conventional insulation, you can actually reduce the size of heating and cooling equipment. That reduces costs immediately. Better yet, SIPs keep your costs down from season to season, year afteryear, for as long as you own your home.

How are electrical and plumbing installed?
In commercial construction, wiring is pulled through conduit. “Chases” or channels are built into the foam cores of a SIP panel that work like conduit. Electricians use a fish tape and feed the wires through panel chases without compressing insulation or drilling through studs. Typically, plumbing is installed in interior walls and floors, but not in exterior walls. Where exterior wall vent pipes are necessary, chases can be formed in the foam cores. Installing island vents or loop vents is also a common practice and can be found in plumbing codes.

Why are SIPs more environmentally responsible?
When you build with SIPs, you’re building homes that can save up to 60% or more on energy costs when compared to conventional stick frame construction. That means less fossil fuel consumption and less greenhouse gas emissions. SIP technology provides higher “whole-wall” R-value, tightens the building envelope, and reduces air infiltration. That allows you to downsize the heating and cooling equipment. It’s the combination of these systems that makes up the technology of a high-performance SIP home. You will also enjoy the green building benefits of less job-site waste, better utilization of material resources, and more environmentally friendly building practices.

Why are SIPs so much stronger?
SIPs structural characteristics are similar to a steel I-beam. The skins act like the flanges of an I-beam, and the rigid core provides the web of the I-beam configuration. This composite assembly yields stiffness, strength, and predictable performance. Not only do test results show panels are stronger, but natural disasters have proven it time and again. Homes built with SIPs withstood the Great Hanshin (Kobe, Japan) and North Ridge earthquakes, as well as Hurricane Andrew.

How do SIPs react to fire?
Fire requires three components: fuel, ignition, and oxygen. SIPs have no “air” within their solid cores of insulation. The fire cannot “run up the wall” cavity. SIPs have passed every standard fire test required of wood based or type V construction. A key element of fire safety is protection of the SIPs and any other underlying structure with 15-minute thermal barriers, such as gypsum wallboard.

How about ventilation?
All advanced technology building systems require mechanical ventilation. These systems bring fresh air into the building and exhaust moisture laden and stale air to the outside. Often, they can be combined with filter systems or other fresh air devices. Not only is ventilation practical, but it’s a code requirement in many areas.

How do SIPs save so much labor?
Cutting and fabricating, based on your construction drawings, are done for you in a SIP manufacturing plant. That reduces site labor and time building materials are exposed to the weather on the job site. SIPs are also made in large sizes up to 8 ft by 24 ft so assembly on-site is faster, framing crews are more productive, and the project is “dried-in” sooner. That means other subcontractors can get a head start on the jobs they need to do.

What is the structural performance of SIPs?
SIPA manufacturers make their panels to meet code requirements and are listed with the National Evaluation Service, Inc. (NES) or the International Conference of Building Officials (ICBO). These reports have load design charts showing allowable loads for given sizes of structural insulated panels. Contact us for specific data regarding the performance characteristics of the panels.

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