Pella Impervia windows and patio doors are built from Duracast®, Pella's proprietary five-layer pultruded fiberglass composite. Pella states the thermoset material won't expand, warp or sag in summer heat or shrink and turn brittle in harsh winters, and because fiberglass moves at nearly the same rate as glass, seals stay tight through freeze-thaw cycles.
The strength allows slim frames and clean sightlines, and the factory powder-coat finish is built to last, including in Black. Frames come in five solid colors (White, Tan, Brown, Morning Sky Gray, Black), or dual-color with a White interior and Brown, Tan, Morning Sky Gray or Black exterior.
Dual-pane Advanced Low-E glass with argon is standard and, per Pella, meets or exceeds ENERGY STAR guidelines in all 50 states; optional foam insulation in the frame and triple-pane glass (on awning, casement and picture units) push the numbers further. Impervia is sold through Pella showrooms, dealers and Lowe's.
Highlights
- Duracast® fiberglass composite that won't warp or sag in heat or turn brittle in cold (Pella)
- Expansion rate close to glass, so seals stay tight over time
- Slim frames and modern sightlines; Black and dark colors available
- Long-lasting factory powder-coat finish in five colors
- Optional foam-insulated frame and triple-pane glass on awning, casement and picture windows
- Dual-pane glass meets or exceeds ENERGY STAR® guidelines in all 50 states (Pella)
- Pella Limited Lifetime Warranty
Available styles
Insulation and energy performance in Minnesota
Fiberglass is a poor heat conductor, and Impervia's Duracast frame can be ordered foam-filled, so the frame does its share of the insulating. For Minnesota, order the foam-insulated frame with AdvancedComfort Low-E glass, and choose casement, awning or picture units where you want triple-pane, since those are the styles that offer it.
Glass packages
- Advanced Low-E dual-pane with argon (standard); bronze, gray or green tint on select products
- AdvancedComfort Low-E for the Northern climate
- NaturalSun Low-E and SunDefense Low-E options
- Triple-pane glass on awning, casement and direct-set (picture) windows only
- Tempered and sound-control glass options
Frame and sash
Duracast® fiberglass composite frame and sash with optional foam insulation in the frame cavities. Powder-coat finish; weatherstripped sash with cam-action locks on hung and sliding units and multi-point locks on casements.
Ratings
Pella states Impervia with dual-pane glass meets or exceeds ENERGY STAR® guidelines in all 50 states; the Northern zone is met with the right glass package, and foam insulation plus triple-pane improve U-factor and sound further. Unit U-factors are on the NFRC label and in Pella's spec sheet.
What the install adds
On install day we set the unit on a sloped sill pan, tape the flanges or brickmould to the housewrap with flashing tape, fill the rough-opening gap with low-expansion foam, and seal the interior with backer rod and sealant before trim goes on. The exterior joint gets backer rod and sealant too, so the rating on the label is what the wall actually gets.
Pella Impervia at a glance
- Frame colors
- Solid White, Tan, Brown, Morning Sky Gray or Black; dual-color frames with White interior and Brown, Tan, Morning Sky Gray or Black exterior
- Interior finish
- Factory powder-coat matching the frame color or White (dual-color)
- Hardware finishes
- Match interior, Tan, Morning Sky Gray, Satin Nickel
- Grilles
- Grilles between the glass: Traditional, Prairie, Top Row, custom equally divided
- Screens
- Standard fiberglass or InView™ high-visibility screens
- Glass
- InsulShield® Advanced Low-E with argon standard; AdvancedComfort, NaturalSun, SunDefense; triple-pane on awning, casement and picture; tempered and sound-control options
- Frame insulation
- Optional foam insulation
- Installation types
- New construction (nail fin) and replacement frames
- Patio doors
- Impervia sliding patio doors in matching colors
- Warranty
- Pella Limited Lifetime Warranty on fiberglass windows and patio doors
- Where sold
- Pella showrooms, Pella Pro dealers, Lowe's
- Made in
- United States (Pella Corporation, Pella, IA)
Product details summarized from the manufacturer's published materials, last checked 2026-10-09. Options, specifications, and availability vary by configuration and change over time — we'll confirm current options and pricing for your project at your free estimate.
