It happens innocently. A worker is boring into concrete in order to fix an issue with a bathroom or HVAC system and, suddenly, they hear a BOOM! The floor vibrates. Expletives ensue. It’s a shocking moment and often the first response is to hope it’s nothing. Unfortunately, what has likely happened is a post-tension cable has been struck and snapped, and even though it can’t be seen, it can cause safety issues and problems down the road.

When accidents happen, give us a call. We hear from contractors and building superintendents frequently when post tension cables have been unintentionally hit by core drillers. This typically happens during work on HVAC systems and plumbing—especially installing toilets.

The good news is: we can help. HEXA is the Colorado expert in post-tension repair, with specialized training under our belts and the been-there-done-that knowledge to get repairs done quickly and seamlessly.

We understand that post-tension expertise is not something contractors have time to invest in. The best choice is to get our team in right away to repair the problem and return the building to a safe condition. And for building owners who don’t have an engineer on staff who can assess the damage, we do it for you, bringing in an engineer with the experience to diagnose exactly what needs to be done to get it done right.

When it comes to post-tension repairs, we’ve seen it all. Our experience and quality set us apart. Post-tension repairs can be tricky and no two jobs are alike. You can rest assured that we’ll do a fast, safe, and efficient job. Don’t be fooled by low bids. Unfortunately, we see others get into a job with a low bid only to bump up the cost with “unexpected items.” We don’t work that way. We have the expertise to bid it right the first time and we’re honest and upfront from the get-go so you aren’t caught with unpleasant “surprises.” If you suspect an “oops” has occurred on your job site, don’t delay, give us a call!

HEXA has always been locally owned, relationship-based, and committed to helping others. We recognize that strong, stable communities benefit us all. That’s why, when we come across an organization that is actively involved in building better communities, we’re happy to give back.

We recently had the privilege of lending a hand to Warren Village – a nonprofit organization located in Denver, Colorado, which exists to help low-income, single-parent families achieve self-sufficiency. We learned of a concrete problem at their facility that was costing them money every day. The sealant on the top deck of their garage had deteriorated, allowing water to leak into their mechanical/engineering room, destroying their electronics. Their budget did not include funds for this type of repair nor replacement of electronic and mechanical equipment.

Our team was happy to step in and help. Our crews first removed the deteriorated sealant from the joints. We then re-caulked all joints and cracks. We prepped and installed a traffic coating on the top deck to prevent a repeat of this type of water damage, which, without preventive action, can be relentless. Check out some before and after photos.

“I’m grateful to HEXA for the repair and sealing work done on our upper deck,” said Forest Ray, Operations and Risk Manager at Warren Village. “For the first time in many years there are no leaks into the shop area below, and it just looks good! It’s been a pleasure working with your entire crew.”

We’re happy we could help so that Warren Village didn’t need to divert funds away from their important, life changing mission. Their program focuses on providing affordable housing, resources for parents, and services for children.

  • Housing: Warren Village offers two- to three-year transitional housing for single-parent families in their 92-unit, Capitol Hill apartment building. Safe, consistent, affordable housing helps families break the cycle of poverty and achieve self-sufficiency.
  • Parent Resources: Each resident must be committed to working toward specific personal and self-sufficiency goals and is paired with a Family Advocate who has specialized training in core areas. Advocates assist residents as they work towards goals associated with post-secondary education, career development, personal finance, life skills, and child development.
  • Early Childhood Services: The United Airlines Early Learning Center, located onsite at Warren Village, provides high-quality, developmental care and licensed early childhood education for more than 100 children, ages 6 weeks to 10 years. The evidence-based classroom management provides a responsive curriculum which prioritizes mental health and developmental support, with a focus on good nutrition.

We’re thankful to be able to give back to the communities we serve and take part in making them stronger. If you’d like to learn more about Warren Village or how you can contribute to their work, visit their website at


We’re moving on up! As we enter our third decade as Denver’s go-to concrete repair contractor, HEXA continues to expand. We’ve moved to a new location in Golden so that we can continue to offer state-of-the-art concrete repair to our loyal customers and many new ones.

Located at 15725 S. Golden Road, we’ve converted a previous four-bay mechanic shop and office to our new, modern headquarters. With blood, sweat, and a few tears, we’ve custom designed the facility with a western rustic biker feeling, open lobby and office space, and our hand-poured epoxy coated floors.

Our new location has room for training, space to hold our equipment, houses a few employee offices and, of course, has room for our bikes! What we like most is that it has plenty of room for our continued growth and expansion.

If you’ve ever moved or renovated, you know the work that goes into it and the pride that goes with it. We’re very excited and would love to show you our new digs – stop by any time!

HEXA is not a huge, faceless, national corporation focused on our bottom line. We are different. Colorado is our home. We’ve been locally owned and operated right from the start, always focusing exclusively on Colorado clients. We take pride in our reputation for innovative communication processes, extremely high client satisfaction, and repeat clients who have become our friends. We’re so thankful for your business and your trust that continues to help us grow so that we can serve you even better.

If it’s true that an ounce of prevention is worth a pound of cure, now is a perfect time to get garages and structures in shape and ready for the winter months ahead. Maintaining your concrete structures on a regular basis means that you don’t get “surprised” when damage gets so extreme that it becomes costly to repair. We’re all about preventive maintenance!

Colorado winters are tough on concrete. When water turns to ice it expands about 9%. If that water has settled into even a hairline crack, it can mean big damage when the temperatures begin to drop.

Whether you’ve noticed some cracks in your parking structures or aren’t sure the last time you had your concrete structures inspected, call our guy, Mike Hubbard. He knows the concrete industry literally from the ground up and has experience in all aspects of concrete repair and maintenance. He’ll walk your site with your property manager or mechanical engineer and discuss what needs to be done to keep your concrete structures in good condition before anything gets to a point of being costly to repair.

We help you protect your concrete investment by repairing a variety of issues including:


Water intrusion

Cracks and leaks

Post-tensioning issues

Damage to concrete coatings

Issues from cut corners

Put your 2022 budget to work and get an inspection scheduled today to give you peace of mind for the cold winter ahead. Give us a call!

We’ve been talking a lot about post-tensioning lately because in Denver, we have an interesting combination of many old parking garages around the city, combined with a lot of new engineers. Post-tensioning has been an effective technique for reinforcing concrete in parking structures and garages for decades, and even though they have good track records with regard to maintenance, it’s important to identify and correct problems early.

When an inspection reveals a problem that needs to be addressed, it’s critical to choose a company with post-tension expertise to execute the repair. Certification from the Post Tensioning Institute (PTI) alone is often not a sufficient indicator for safe, quality repairs. Experience is key.

PTI is a nonprofit organization that has generated manuals, best practice procedures, and certification classes designed to train engineers and field personnel in correct post-tensioning installation. However, installation and repair are totally different animals. The PTI training manuals, while important, cannot be applied to both activities.

Plus, no two repairs are exactly alike. Sometimes technicians don’t even know what they’re dealing with until they start removing concrete from a structure — a potentially dangerous process for anyone without adequate hands-on experience.

That’s why direct experience with post-tension repairs is crucial. This includes experience with building inspections, practical knowledge of specialized tools, and recent history performing repairs on a variety of different structures.

HEXA technicians have comprehensive training including hands-on experience with installation, assembly, and safety regarding post-tensioning replacement and repair so they can:

  • Help diagnose cracking slab or joint misalignment
  • Figure out why chemicals are leaking from within the walls
  • Determine the weak points in a structure and calculate exactly how to strengthen them
  • Keep safety the utmost priority

Post-tension repair is an important investment and trusting your job to just anyone can be a very costly mistake. Reach out to us today, and let’s chat about how we can help support your post-tension repair needs.

Post-tensioning has been an effective technique for reinforcing concrete in parking structures and garages for decades. Here’s some background on the basics of post-tensioning. Although post-tensioned structures typically have better track records when it comes to maintenance, they are complex systems that are subject to some specific vulnerabilities, especially when initial installation was less than ideal. Identifying and correcting problems requires special investigation and repair expertise and techniques.

There are several challenges to consider with post-tension repair work:

  • Many buildings have unknown history. Present-day building owners may not know what materials or systems were involved when their structures were built. Trained experts can spot and diagnose issues quickly.
  • Specialized knowledge is rare. Knowing how to repair older concrete structures requires specific experience and specialty tools. Dealing with post-tensioning systems can present conundrums for any contemporary engineer who is unfamiliar with how to diagnose or repair its unique issues.
  • Repairs can be costly when contractors aren’t properly trained. When a structure or building needs a repair, specifically post-tension repair, the investment can get out of control if the contractors don’t possess practical application and hands-on experience. These repairs also come with inherent challenges and safety risks.

This doesn’t mean post-tension repair needs to be a huge stressor. Still, it’s critical to choose a team with extensive knowledge as well as field experience with safe, efficient diagnostics and restoration techniques. Post-tension repair is one of HEXA’s specialties and a technique in which we have certification through the Post-Tensioning Institute.

Contact us and we’ll perform a complimentary inspection with an estimate for repair work.

Check out our Post-Tension Repair brochure here.

Pioneered in the 1930s by French, structural engineer, Eugene Freyssinet, post-tensioning is a system for reinforcing concrete, structural elements. It consists of pre-installed steel tendons that run the length of the beam or deck span, are anchored at both ends, and then are stressed when installed.

By applying a pre-stress load, post-tensioning pre-emptively counteracts tensile stresses and is therefore an active reinforcing system, whereas rebar is passive. By keeping the concrete in compression, post-tensioning strengthens the concrete and foundation and helps reduce cracking. While the buildings can stand on their own, the post-tensioning carries the load.

Post-tensioning is typically used in parking decks, garages, bridges, and nuclear reactors built since the 1970s and 1980s. With age comes wear and deterioration. What original designers didn’t foresee, however, was the extensive use of salts and de-icing chemicals on these structures in cold weather. This contributed to faster wear and a greater degree of damage, including rust, which must be identified and repaired to keep the structures safe.

Many engineers evaluating the condition of these older structures were not even born when these structures were built. New engineers must assess buildings and make determinations when there is quite possibly no engineering information available from the original design. In addition, today’s engineers may not be as familiar with older systems which can be very different from the modern systems they install today. For example, parking decks built today are waterproofed; 50 years ago, they were paper wrapped. Most owners don’t know what materials were used in their structures, and most engineers don’t know how to deal with button head or rod systems from the early 1970s.

That’s where Colorado’s experts in post-tension repair come in. HEXA’s team has the in-depth know-how to repair and restore these structures safely and efficiently. We can help you understand what cracking, joint/slab misalignment, or chemical leaks from walls means for the future of your structure – and what it takes to repair it. Reach out today, and let’s chat about how we can help you add many useful and safe years to the life to your structures. Check out our Post-Tension Repair brochure here.

In 1999 Mike McDonald founded McDonald Waterproofing and Restoration with a vision to bring honesty, friendliness, and concrete repair services of the highest quality to Colorado’s Front Range. Established on straightforward values of integrity, doing the job right the first time, having fun, and friendships with team members and clients, we’ve built a solid, trusted reputation throughout Colorado.

January 2020 marked the company’s 20th anniversary. Along with achieving that milestone, and in anticipation of the upcoming sale and transition, the company was renamed HEXA – a McDonald Company. The new name represents the excellence and efficiency of the team and the strength under pressure that characterizes our specialty repair solutions.

Now the company marks yet another milestone. Mike McDonald has announced his retirement and has sold the company to Joe Keller. Joe has worked in the concrete repair industry more than 20 years, many of those spent with Mike, helping grow HEXA into the company it is today. He has served the last three years as President and COO, building on the vision that Mike created more than two decades ago.

“I’m proud of this company and the entire team who helped us get to where we are today,” said Mike. “Joe is a strong leader who has been instrumental in our growth, and it is with great pride and confidence that I pass the baton, and ownership of this great company, to his continued leadership.”

“I’m honored that Mike has entrusted me with his legacy,” commented Joe, HEXA’s new Owner, President, and CEO. “HEXA has the hardest-working people and the best customers. It’s a privilege to take over ownership as we grow the company, do the work we love, and continue to make lasting friends along the way.”

In 2021, we watched our company grow — not only welcoming new clients and completing many great projects, but also expanding our team. We created positions, brought in additional experts, and focused on ways to make the HEXA family stronger and more cohesive.

To set a marker for continued growth and expansion, we started a new tradition in 2021; during our annual Christmas party, we give away a motorcycle to an employee who wins a raffle by having their name drawn from a hat. Each year, as we grow, so will the bike be bigger and better!

This year, Braulio Alvarez was super-excited to win a fun, Coleman 200cc minibike. With a top speed of about 20 mph, it’s great for zipping around the neighborhood or running errands. Braulio has been a valued part of the HEXA team for a little more than a year, working as a technician/laborer. Other employees also won fantastic items — a 65-inch Samsung TV, Yeti cooler, and gift cards. All HEXA staff members received Wyld Gear water bottles and cups. This new tradition celebrates what being part of HEXA is all about – the fun and camaraderie of working together as a solid team.

With a lot of projects already booked for 2022, we are fueled by the energy and excitement that comes with working in a positive environment, growing along with great people who are dedicated to the values on which this company is built, and serving customers who have also become cherished friends. We stand behind each other and have our customers’ backs in protecting their concrete investments. We anticipate great things and look forward to sharing more good news as the year unfolds. Stay tuned for 2022’s bigger, badder bike!

Post tensioning is used instead of traditional rebar in applications where it’s especially important to reduce concrete shrinkage or eliminate cracking. This method of strengthening concrete is a good choice in a variety of applications. We’ve recently been doing post-tension repairs in a parking garage at Metro Point in Denver to restore strength to concrete and thought we’d share a little about the process.

Post tensioning uses steel cables – referred to as post-tensioning tendons – inside plastic ducts or sleeves that are positioned in the forms before concrete is poured. Once the concrete has gained strength, but before it has to support service loads, the cables are pulled tight – or tensioned – then are anchored against the outer edges of the concrete.

If post-tensioning components become weakened or damaged due to water intrusion, we remove the concrete to expose the deteriorating tendons. We then install new hardware and tendons and re-stress the cables before replacing the concrete. Finally, we waterproof the new concrete to maintain its integrity and prevent damage to the post-tensioning cables, which can be especially vulnerable to Colorado weather.

Repairing or altering post-tension cables is one of HEXA’s specialties. To discuss restoring the strength of your concrete for years to come, call the HEXA experts today. Check out our Post-Tension Repair brochure here.