Demilec Radiant Barrier Installation: The Houston Owner’s Guide
Demilec radiant barrier installation in Houston typically runs $1,100 to $2,800 depending on attic square footage, roof pitch, and how much of the existing insulation needs to be moved or removed first. We stock Demilec-compatible radiant barrier and finish most installations same day, with a written price in your hand before work starts.
Most homeowners discover their radiant barrier has failed when they climb into the attic for something unrelated and see foil hanging loose from the roof deck, torn at the staple points, or coated in a layer of dust so thick it’s no longer reflecting anything. Others notice it on the utility bill when August hits and the AC won’t shut off. Either way, the fix usually comes down to a competent reinstall or a fresh roll of barrier, not a patch job.
Key Takeaways:
- Demilec radiant barrier is a foil-faced product stapled to the underside of your roof deck to reflect radiant heat before it reaches your attic floor
- Typical installed cost in Houston: $1,100 to $2,800, with written pricing before we start
- Most installs take one day, and our crew leaves the attic cleaner than we found it
- Alden Insulation Houston is an independent installer, not affiliated with Demilec, but we work with their products alongside Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, and GreenFiber
Which Demilec Models This Applies To
Demilec’s radiant barrier line doesn’t follow the model-number convention you’d expect from a furnace or a water heater. Their foil barrier products are sold primarily as HeatBloc-75 and HeatBloc-Ultra, and the difference between them matters in a Houston attic. HeatBloc-75 is a single-layer perforated foil designed to be stapled directly to rafters. HeatBloc-Ultra runs heavier with a reinforced scrim and handles the higher humidity of a Gulf Coast summer without sagging. If your existing barrier is pulling loose at the staples, you’re almost certainly looking at a HeatBloc-75 install that was either stapled too wide or installed in an attic that runs significantly hotter than the product was spec’d for.
Identifying which product you have is straightforward: look for the printed product code on the foil’s face, usually about 18 inches in from the edge. The perforation pattern is the second tell. HeatBloc-75 has round perforations on roughly six-inch centers. HeatBloc-Ultra is heavier gauge with a visible weave under the foil and smaller, tighter perforations. We can match either with Demilec product or a spec-equivalent aftermarket barrier if you’re looking to keep the budget tighter. The important thing is that perforated barrier goes in a ventilated attic, and that’s a conversation we’ll have on the phone before anyone climbs a ladder.
Signs Your Demilec Radiant Barrier Installation Is Failing
- Foil hanging loose or drooping between rafters. This is the most common failure in Houston, and it’s almost always a staple problem. The original installer used too few staples or the wrong crown width, and six or seven years of attic heat cycling worked them loose. Once foil sags, it stops reflecting heat and starts trapping it.
- Tears radiating from staple points. Foil doesn’t tear on its own without a reason. When you see runs of small rips near the staples, that’s thermal expansion stress. The installer pulled the barrier too tight, and Texas heat did the rest.
- A layer of dust or blown-in insulation dust on the foil face. Radiant barrier works by reflecting, not by touching. If the foil is filmed over with dust, its reflectivity drops sharply. In attics with loose-fill insulation, it’s common for years of minor air movement to settle particulate onto horizontal sections of barrier.
- Attic temperature noticeably higher than last summer. A properly installed radiant barrier can cut attic temps by 20 to 30 degrees in a Houston July. If you’re opening the attic hatch and getting hit with what feels like a sauna, the barrier has either failed mechanically or degraded enough that it’s no longer doing its job.
- AC runtime climbing while your thermostat setting hasn’t changed. This is what Bryce Holloway calls the utility-bill symptom. When a Houston home’s barrier goes down, the attic superheats, the ductwork and insulation soak more heat, and the AC cycles longer to hold the same indoor temperature. It’s gradual, but the bill tells the story.
Replacement Cost & What’s Included
For a typical single-story Houston home with a 1,800 to 2,500 square foot attic, installed Demilec radiant barrier runs between $1,100 and $2,800. The range exists because every attic is different, and we’re not going to pretend otherwise. The big drivers are roof pitch (steeper means more labor), access (tight attics with low clearance take longer), and whether the existing barrier has to be pulled down before new material goes up.
Every quote from Alden Insulation Houston includes the barrier material, all staples and fasteners, removal of the old failing barrier where needed, cleanup of any debris we generate, and a written guarantee valid for 365 days. That guarantee is the whole point of the way we work. If the install fails within a year, we come back and fix it at no charge. You won’t be chasing a warranty department.
| Scope | Typical Installed Price (Houston) |
|---|---|
| Partial attic, one gable end (up to 600 sq ft) | $1,100 – $1,500 |
| Full attic, standard pitch (1,500 – 2,000 sq ft) | $1,600 – $2,200 |
| Full attic, steep pitch or low clearance | $2,200 – $2,800 |
| Removal of failed existing barrier (added to any job) | $200 – $450 |
That’s the number you approve and the number on the invoice. No add-ons at the door. The 365-Day Done Right Promise is in writing, and it’s non-negotiable on every job we do.
DIY or Call Us?
We’ll be straight with you: reinstalling radiant barrier is a job some homeowners can handle, but the failure rate on DIY installs in Houston attics is high enough that we’d rather you know what you’re getting into. You’re working overhead, often on a ladder or scaffolding, in an attic that can hit 140 degrees in the summer. Heat exhaustion is a real hazard, and so is putting a foot through the ceiling drywall. If you’re going to attempt it, work in spring or fall, wear a respirator, and never stand on the joists’ centers without verifying your footing first.
The technical part that trips up DIYers is staple placement and tension. Too few staples and the foil sags within a season. Too much tension and thermal expansion shreds the foil at the fastener points in the first Texas heat wave. Getting the overlap right at seams also matters more than it looks like. If any of that sounds like something you don’t want to learn by trial and error on a 2,000 square foot attic floor, call us at (806) 581-1010. We’ll get it done right the first time, and the guarantee is in writing.
FAQs
A properly installed Demilec radiant barrier should last 15 to 20 years in a Houston attic before the foil’s reflectivity or mechanical integrity starts to meaningfully degrade. The failure you see at year six or seven is almost always an installation problem, not a material problem. Heat and humidity don’t kill foil, but they’ll find every bad staple and over-tensioned seam. That’s why our installs carry a 365-day written guarantee, and why the quality of the install matters more than the brand name on the roll.
Small tears and a few loose staples can be repaired without replacing the whole barrier. The honest answer is that when foil has sagged across large sections or torn at multiple staple points, repair work becomes a losing game of chasing weak spots. We’ll tell you which situation you’re in after one look in the attic. If it’s repairable, we’ll quote the repair. If it’s not, we’ll quote the replacement and explain exactly why. Call (806) 581-1010 for a straight answer and a free estimate.
Most Demilec radiant barrier installations in Houston take one working day from setup to cleanup. A large attic with steep pitch or tight access might stretch into a second morning. We show up inside the scheduled window, the crew is background-checked and in uniform, and we don’t leave until the attic is cleaner than we found it.
We stock Demilec HeatBloc-75 and HeatBloc-Ultra, plus spec-equivalent aftermarket radiant barrier options, and we carry a small inventory of Reflectix products for edge cases where the homeowner wants to handle a small section themselves. No ordering, no waiting on a distributor, no “we’ll call you when the material comes in.” If your attic needs it, it’s on our truck.
Written by Bryce Holloway, Owner, Alden Insulation Houston at Alden Insulation Houston, serving Houston and nearby areas.