SIP Apartment Building Longmont CO

Location: Longmont, CO

Project Information

Project Type: Residential, Multifamily
Manufacturer: Premier Building Systems
Builder: Gabler Homes LLC
Design Professional: Workshop 8
Year Built: 2023


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

Building use:
20 unit high performance multifamily apartment building.

How did SIP construction help you get this job?
Speed of construction, low energy costs for long term operational savings, and durability for multifamily application.

SIP wall thickness: 6 ½”
SIP roof thickness: 12.25”

Benefits of using SIPs on this project. Did SIPs help save time, labor, construction costs, or energy?
SIPS are the only way we build now. We save time, build a stronger, safer, more comfortable structure, that has an incredible environmental impact with little jobsite waste, drastically reduced operating costs (which helps keep long term tenants), and durability requiring less maintenance than other framing assemblies. 

In terms of speed of construction SIPS ensured that all wall were straight which helped us when laying out all other walls. Additionally sips allows for us to quickly build the exterior walls. We were able to finish the roof panels in two days!
Describe any innovative design elements or structural engineering involved:

The floors were constructed with top chord hanging trusses so the SIPs were able to be as much of the exterior wall as possible.

With decades of experience working with SIPS we now are able to optimize the design to take advantage of SIP benefits (larger panels, longer spans) which reduces our costs and increases building structural integrity.

Energy use intensity in kBtu/ft2:
No real data for this yet but our 3 bedroom units are about $50 to heat and cool per month (in the CO winter), which is great for 1300 sq ft.

Describe the HVAC system used on the project:
Individual dwelling unit, high performing mini-split systems. Given our efficiency we saw in our previous buildings, mini splits allowed us to remove gas entirely from the project.

Describe any other energy-saving materials used in the building envelope other than SIPs. List U-values of windows used and the U or R-value of any insulation materials.
ICFs used for below grade foundation. Fully electric building. We also used efficient windows in the design. Our building also has capability for car chargers, which we have allocated space for 6 car charging ports in the future.

Low emitting LED lighting, on demand hot water, all electric - no gas.

Solar ready, design details coming from owner. Not available at time of application.


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Premier SIPS

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