Duracast fiberglass frames
Pella calls its Duracast fiberglass "the strongest material for windows and patio doors." It reports the material as 1.2x stronger than aluminum in a bend test and 11x the tensile strength of wood, on average.
Replacement windows · installed by RADIANT
Pella
Pella Impervia Fiberglass Windows in Southlake & Dallas
Impervia is Pella's fiberglass window line — the only Pella line made from its proprietary fiberglass, which Pella calls its strongest window material. RADIANT installs Impervia across North DFW, and we'll tell you honestly whether it's the right fit for your home and budget.
See Pella on display at our Southlake showroom — 500 N Kimball Ave #106, Southlake. Mon–Fri 8:00 AM – 5:00 PM.
Pella Impervia at a glance
The product line
What Pella says sets Impervia apart
Everything below is how Pella describes its own product. We'll show you the samples in person so you can judge the frames, finishes and hardware for yourself.
Built not to move in the heat
Duracast is a thermoset material that Pella says "won't expand, warp or sag in summer heat," with virtually no expansion and contraction — which helps seals and long-term stability.
Won't rot or corrode
Pella says the fiberglass "will never rot or corrode, and it resists dents, bends and breaks." The powder-coat finish meets AAMA 624 and is described as resisting chalking, fading and scratching.
Solid and dual-color frames
Solid colors include White, Brown, Black, Tan and Morning Sky Gray. Dual-color frames pair a White interior with a Brown, Tan, Morning Sky Gray or Black exterior (availability varies by frame type).
Grilles, screens and locks
Grilles-between-the-glass in Traditional, Prairie and other patterns; InView high-transparency screens; and on double-hungs, a cam-action lock Pella says improves security and creates a stronger seal.
Wood or vinyl instead?
For replacement, Pella also lists the Lifestyle Series (wood), and the 250 Series and Encompass by Pella (vinyl). Ask us if you'd like to compare them against Impervia.
Window styles
Impervia styles offered by Pella
- Casement
- Awning
- Double-hung
- Single-hung
- Sliding (OX, XO, XOX)
- Picture / fixed
- Special shapes
- Bay & bow combinations
- 2- and 3-wide hung & casement
- Sliding patio doors
Sizes and configurations vary by style. We measure every opening before anything is ordered.
Energy & glass
Glass choices that matter in a North Texas summer
Pella states that Impervia offers energy-efficient options that meet or exceed ENERGY STAR guidelines in all 50 states. In practice, the glass package is where most of the energy decision happens — and the right choice for a west-facing wall in Southlake may be different from a shaded north window.
- Low-E coatings: Advanced Low-E, SunDefense, SunDefense+, AdvancedComfort, NaturalSun and NaturalSun+
- Dual-pane with argon, with triple-pane also available (not with AdvancedComfort Low-E)
- Optional foam insulation in the frame and sash
- Specialty glass: STC sound-control, tempered, laminated, tinted, obscure and impact-resistant options
Already have good windows but a hot room? Solar screens block 80–90% of Texas summer heat and can be a lower-cost first step.
Warranty
How Pella's Impervia warranty works
Under Pella's fiberglass windows and patio doors limited warranty, rectangular Duracast frames, sashes and panels in owner-occupied single-family homes are covered for as long as you own your home; that coverage isn't transferable and becomes a transferable 10-year warranty after a sale. Insulating glass is covered for 20 years and other non-glass components and the exterior powder-coat finish for 10 years, with labor included only within the first two years. Exclusions and conditions apply — read the full document.
RADIANT reviews coverage with you at the estimate.
| Component | Pella limited warranty |
|---|---|
| Duracast rectangular frame & sash | As long as you own your home* |
| Insulating glass | 20 years, transferable |
| Other non-glass components | 10 years, transferable |
| Exterior powder-coat finish | 10 years, transferable |
| Labor | Included within 2 years of sale |
*Owner-occupied single-family homes. Special shapes carry a 10-year frame warranty. Summary only; Pella's document governs.
Honest fit
Is Pella Impervia right for your home?
Often a good fit if you…
- Want a strong, low-maintenance frame that won't rot or need painting
- Like darker exterior colors such as Black or Brown and want a frame Pella says won't warp in summer heat
- Plan to stay in the home and value Pella's lifetime frame coverage for owners
- Want one consistent frame material across casement, hung and sliding styles
Worth comparing if you…
- Want a wood interior — ask about wood lines instead
- Are working to a tighter per-window budget — compare vinyl and composite options
- Have only a few failed panes in sound frames — new glass may be enough
Compare: Andersen 100 Series · Wincore · Anlin · All brands we install
Frames still sound? You may only need new glass.
If your windows are foggy or drafty at the glass but the frames are solid, replacing just the insulated glass is usually a smaller job than new windows. We'll tell you which you need — even if that means less work for us.
Pella Impervia questions, answered
What are Pella Impervia windows made of?
Pella's proprietary Duracast fiberglass composite — a thermoset material Pella says won't expand, warp or sag in summer heat, and will never rot or corrode. Impervia is the only Pella line made from it.
Are Impervia windows ENERGY STAR certified?
Pella states that Impervia offers energy-efficient options that meet or exceed ENERGY STAR guidelines in all 50 states. Whether a specific window qualifies depends on the glass package chosen, so we confirm it on your itemized quote.
What warranty comes with Pella Impervia?
Per Pella's limited warranty: rectangular Duracast frames and sashes are covered for as long as you own your home (owner-occupied single-family homes), insulating glass for 20 years, and other non-glass parts and the exterior finish for 10 years, with labor included within two years of sale. Read the full warranty.
Can I see Pella windows before I decide?
Yes. Pella is on display at our Southlake showroom, 500 N Kimball Ave #106, open Monday–Friday 8:00 AM – 5:00 PM. Call (817) 565-3652 to set a time so someone can walk you through it.
Can I finance Pella replacement windows?
Yes. Financing through Medallion Bank offers terms up to 144 months. See financing.
Product information sources
Product details summarized from Pella's published materials, reviewed October 2026. Specifications and warranties can change; Pella's current documents govern. Pella and Impervia are trademarks of Pella Corporation.
See Pella Impervia in person, then get an honest quote.
Free in-home estimate. Itemized, no-surprise quote. No pressure, no obligation.