The following resources are provided to learn more about HK products and concrete sandwich panel construction. Contact us if you have any additional questions.
Approvals & Test Results
HK products and ties have been rigorously tested both in the lab and in the real world and have received approval from a variety of governing bodies.
- Long-term alkaline resistance
- Concrete pull-out
- Fire resistance
- Cyclic fatigue
- Finite Element Analysis (FEA) modeling
Report number: ESR-3381
HK ST Thermopolymer Wythe Connectors For Integrally Insulated Wall Panels
Fire Testing Report
- View Fire Testing Report
- Download Report
Get the specifications for the HK concrete insulated sandwich panel wall ties by clicking on the links below. Use the specifications to ensure your next tilt up construction project is designed and engineered to the correct specifications.
- Standard / Non-Composite System Tie Specifications
- Vertical Pour / Modular Precast System Tie Specifications
- Composite Action System Tie Specifications
How It Works
Learn how concrete sandwich panel installation works starting from design, pre-construction planning, and product installation in the following videos.
- Installation Instructions Pub. No. HK-ST-II
- Installation Instructions Pub. No. HK-VP-II
- Installation Instructions Pub. No. HK-CA-II
This is a list of projects we have completed all over the world. We know each project is unique and would like to discuss your project plans should you have an issue we have not covered.
HK will evaluate your project and answer any questions you may have. We will ensure your project is off to the right start with a number of analyses created which will provide detailed information about the concrete sandwich wall performance.
The Mass Correction Analysis shows how a thermal mass “high mass” wall behaves in a given climate in comparison to a “low mass” wall (such as stick-built or insulated metal panel) as a whole in terms of building performance. This analysis produces a steady-state (material) R-value and the (effective) R-value required of a low-mass wall to match a thermal mass wall in BTU consumption. In other words, it shows that high mass walls will always perform at a much higher R-value than just the purchased or “material” R-value.
The Isothermal analysis shows how thermal bridges affect a wall assembly’s R-value, by comparing a wall featuring thermal mass systems to a competing wall system, such as one built with metal ties and solid-through concrete sections or brick and block cavity wall. This analysis produces a calculated (steady-state) R-value and a corrected R-value for each panel, as well as the percentage of loss for the walls.
The Energy Savings Analysis shows the expected energy savings per year from a thermal mass wall when compared to competing wall system. R-values from a mass correction or isothermal analysis are used. Calculated over a period of one year, only energy consumption through the opaque portion the wall is considered with this analysis.
Based on the theory of water migration present in the ASHRAE Handbook of Fundamentals, Dewpoint Analysis analysis is used to illustrate and predict the water vapor migration and condensation potential for a given wall assembly.
Frequently Asked Questions
How do HK Ties work?
View the "How it Works" page to see a demonstration video.
Are HK Ties Tested?
Yes. Our patented low-conductivity polymer systems excel in tests for tensile strength, shearing, concrete pull-out, long term alkaline resistance, fire, cyclic fatigue, and many building code certifications. See HK testing reports here.
Do I save money using HK Ties?
Yes. Our simple manufacturing process used to make HK Ties, called thermoforming, reduces our output costs which increases your “bang for your buck”. Not only that, HK Ties reduce the R-value of the wall by less than 1% compared to as much as 75% reduction with steel and/or typical solid concrete section ties. This results in maximum energy savings!
Also, because HK Ties are manufactured using a simple process, they cost less to produce and we can pass along that savings to our users.
Does HK use fiberglass to make Ties?
Being the best means being different; we don’t use fiberglass in our HK Standard Ties. HK Standard Ties are made from an engineered reinforced thermoplastic, enabling our standard ties to be more durable than competitor ties. In contrast, HK Vertical Pour/ Modular Precast Ties and Composite Action Ties are made from a fiberglass reinforced thermoplastic.
Regardless of the engineered make-up, all HK Ties are designed to resist impact and shock loads during precast panel transportation and erection. The resin retains its strength at high temperature and provides maximum long-term chemical resistance.
Construction jobs come in many different shapes and sizes. Different jobs require different ties. Our HK Tie experts are here to help you find the best tie for your project. Contact us today!
Is plastic as strong as fiberglass?
Fiberglass is plastic—reinforced with glass fiber. Strength-wise, it is true that some types of fiberglass have a higher material tensile strength than HK Tie resins. However, high material tensile strength is only one factor responsible for the tensile capacity of a tie. The minimum cross-sectional area and manufacturing processes together with inherent material properties ultimately determine tie strength. The actual delivered tensile and shear strengths of HK Ties are many times higher than required.
The plastic used for the HK Standard Ties is a high-impact, high-temperature, chemical resistant engineered thermoplastic. The plastic used for the HK VP (Vertical Pour) and Modular Precast Ties is glass fiber reinforced.
Every job is another dragon to slay. We will help you get the job done cost-effectively, safely and as quickly as possible. Contact us today!
Can my project receive LEED points for using the HK Building system?
Yes. With the HK building system, you can go green and save green. HK Green Building Insulation Systems are designed to meet green building standards for better thermal protection and energy performance from longer-lasting, environmentally benign building materials.
The system is created using extruded polystyrene foam (XPS) insulation in-between two concrete wythes. Highly durable HK Ties, inserted into the XPS, have been proven to reduce the insulation R-value by less than 1% Compare that to as much as 75% reduction with steel and/or typical solid concrete sections! This small change can make a big difference! Start saving and contact us today.
Does HK offer a turnkey solution?
Yes. Our turnkey foam fabrication solution is one of many reasons why we are the concrete sandwich construction industry leader. We specialize in and have extensive experience with foam fabrication processes.
When the foam is fabricated, boards are pre-cut to fit architectural drawings. We make it easy for you as we provide specific foam layout drawings and pre-drill the XPS energy-efficient insulation board to accommodate HK Tie insertion. HK insulation foam boards come to the job site, placement ready. Bye, bye head scratching and complicated puzzles, hello revenue.