Guardsman Duct Repair & Sealing Nationwide

Guardsman Duct Repair & Sealing in Lewisville: What to Know First

We provide independent Guardsman duct repair and sealing in Lewisville, typically completing jobs in a single visit with a written price delivered before any work begins. Most Guardsman systems we encounter are in homes built between 2015 and 2022, where the original ductwork is now showing the first round of flex duct sagging, sealant degradation, or register boot separation. We’re CleanRun Air Duct Cleaning Lewisville, and we operate under the Haven Standard: every job gets a written price upfront, a documented photo record of every duct run, and our 365-Day Done Right Promise in writing. Call (940) 240-8552 for a free estimate.

Call (940) 240-8552

How Guardsman Products Fail - and How We Fix Them

• Guardsman FlexPro Series sagging at the plenum connection. The FlexPro line uses a lighter-gauge flex duct that performs well when properly supported, but in Lewisville’s clay-heavy soil conditions, foundation settling after 2018 construction has caused hanger strap failure in attics across Castle Hills and Valley Vista. We find the sag point with a borescope, install a rigid support bridge, and re-terminate with mastic sealant rated for the FlexPro’s jacket material.
• Guardsman MetalSeal galvanized trunk lines at register boots. The MetalSeal series uses a rolled-edge connection at the boot that looks clean on install but can work loose from thermal cycling in North Texas attics, where summer temperatures exceed 140°F. We document the gap with a photo, then either re-crimp the original boot or replace with a quality aftermarket boot that maintains the MetalSeal’s 26-gauge specification.
• Guardsman RigidFlow plenum seams opening at corners. RigidFlow plenums are fabricated with a Pittsburgh lock seam that can stress-fracture when the HVAC system cycles frequently, which is common in Lewisville’s shoulder seasons when days swing from 45°F to 75°F. We seal with fiberglass-reinforced mastic or, if the fracture has propagated, fabricate a replacement corner section from matching 30-gauge galvanized stock.
• Guardsman FlexPro insulation compression at elbows. The FlexPro’s R-6 insulation sleeve compresses to R-2 or lower at tight elbows, creating condensation points in humid summer conditions. We don’t just patch the outer jacket; we remove the compressed section, install a pre-insulated elbow with maintained R-value, and photograph the thermal improvement with an infrared reference shot.
• Guardsman MetalSeal damper shaft seal failure. Manual balancing dampers in the MetalSeal line use a felt washer that degrades after 6-8 years of ozone exposure in Texas attics. We replace with silicone-impregnated graphite seals that outlast OEM felt, or source the Guardsman OEM washer if the homeowner prefers - both options are priced in writing before we start.

Our Guardsman Duct Repair & Sealing Process

1. 1
   Written price delivered first. Haven Standard Clause 1: we inspect, scope the accessible ductwork, and deliver a written price before any panel comes off. No exceptions.
2. 2
   Borescope diagnostics with photo documentation. We run a camera through every accessible duct run, photographing the failure point and any secondary damage. The homeowner sees the image before we discuss the repair.
3. 3
   Parts decision: OEM or quality aftermarket. For Guardsman systems, we stock common MetalSeal boots and FlexPro support hardware. If we need to order Guardsman OEM, we tell you the lead time and show you the aftermarket equivalent side by side. Your choice, your price in writing.
4. 4
   Repair with negative-pressure containment. We seal the work zone, run HEPA-filtered negative-pressure extraction during cutting or mastic application, and protect the living space from debris. Equipment includes Rotobrush and Nikro containment systems.
5. 5
   Post-repair pressure test and photo record. We pressurize the repaired section, verify static pressure recovery at the air handler, and photograph every completed joint. The photo record, written scope, and 365-Day Done Right Promise are delivered before we leave.
6. 6
   Cleanup and final walkthrough. We walk the job with you, show the before-and-after photos on a tablet, and collect payment only after you confirm the work matches the written scope.

Before

After

What Guardsman Duct Repair & Sealing Costs in Lewisville

What moves the price: accessibility (crawl space vs. walkable attic), number of failure points found during scoping, and whether we use Guardsman OEM parts or quality aftermarket equivalents. We don’t do per-vent pricing or teaser rates. One flat price per system, agreed in writing, before work starts. Call (940) 240-8552 for a free estimate - we’ll put our number next to any competitor’s written quote under our Free Second Opinion policy.

Why Lewisville Homeowners Call CleanRun Air Duct Cleaning Lewisville for Guardsman Work

We’ve been running jobs in Lewisville since 2013, including the older flex duct installations near Castle Hills where sagging and debris accumulation don’t show until you put a camera inside. Tomas Reyes and our crew know the difference between a FlexPro and a MetalSeal failure mode, and we document what we find instead of describing it with adjectives.

Our 365-Day Done Right Promise is backed in writing on every job, not just stated in marketing copy. Haven Standard Clause 3: Verified Crews means our technicians are background-checked, uniformed, and identified by name before arrival. We also service Lennox, Trane, and Carrier duct systems, so if your Guardsman is integrated with another brand’s air handler, we understand the interface. Here’s the before photo. Now let’s talk about what happens next.

FAQs