Updated September 2026. How we research products
UpgradeWorth illustration of a casement unit in a composite frame, showing wood fibre in the polymer. Not a photograph of the product. View official product photos.
Andersen · 100 Series
Fibrex composite, and a warranty that survives the sale
Andersen’s value line, and the one homeowners meet when they ask for something priced against vinyl. It is neither vinyl nor fiberglass, which is the first thing to get straight before comparing quotes.
- MaterialFibrex composite: 40% reclaimed wood fibre by weight, per Andersen
- PositioningValue line, below the clad-wood 400 Series
- WarrantyOwner-to-Owner, transfers when the home is sold
- StylesSingle-hung, casement, awning, gliding, picture, specialty. No double-hung
- FinishDark exteriors, covered 10 years against flaking and fading
- Energy dataNo line-wide U-factor published: check the NFRC label
UpgradeWorth has not physically tested this product. This review is built from Andersen’s product pages and brochure, its warranty documentation, dealer material and publicly available information. Where a figure comes from a dealer or a third party rather than from Andersen, we say so.
The 100 Series is Andersen’s value line, and the one homeowners meet when they ask Andersen for something priced against vinyl. The important thing to understand before comparing quotes is that it is not vinyl, and it is not fiberglass either.
Quick summary
| Brand | Andersen |
|---|---|
| Series | 100 Series |
| Frame material | Fibrex composite, not vinyl and not fiberglass. Andersen describes Fibrex as a proprietary composite of reclaimed wood fiber and thermoplastic polymer, stating it is composed of 40% reclaimed wood fiber by weight, most of it reclaimed from the manufacture of Andersen wood windows, and that it is twice as strong as vinyl |
| Styles | Single-hung, casement, awning, gliding (sliding), picture and specialty shapes, each with its own product page on andersenwindows.com. Andersen also offers 100 Series gliding and hinged patio doors |
| U-factor | Not published by Andersen as a single range. One dealer page cites a 0.29 U-factor with 0.21 SHGC for a configuration it sells; a third-party guide cites 0.27 to 0.30. Configuration dependent: check the NFRC label on your quote |
| SHGC | Not published by Andersen as a single range. Dealer-cited 0.21 for one configuration. Configuration dependent |
| ENERGY STAR | Andersen states many 100 Series configurations are ENERGY STAR certified, and certification depends on the glass package and the climate zone rather than on the series as a whole |
| Warranty | Andersen Owner-to-Owner limited warranty, which Andersen states is transferable when the home is sold. Dealers consistently describe the 100 Series terms as 20 years on glass and 10 years on non-glass components, with exterior finish covered against flaking, blistering, cracking, pitting, corrosion and loss of adhesion for 10 years. Read the current warranty document at andersenwindows.com/support/warranty before purchase |
| Price position | Not publicly specified |
| Installation | Replacement (insert) and new construction; sold through Andersen dealers, certified contractors and the Andersen at Home Depot program |
Specifications from the manufacturer and certification databases, last verified September 18, 2026. Official product page. Values vary by configuration; check the label on your own quote.
What Fibrex actually is
Andersen describes Fibrex as a proprietary composite of reclaimed wood fiber and thermoplastic polymer, stating it is 40% reclaimed wood fiber by weight, most of it recovered from the manufacture of Andersen’s own wood windows. Andersen’s claims for it are that it is twice as strong as vinyl, that it holds its stability and rigidity across climates, and that it blocks thermal transfer nearly 700 times better than aluminum.
Two practical consequences follow from the material, and they are the reason the line exists.
The first is color. Dark exterior colors are where vinyl is most exposed: heat absorption and frame movement are the standing objection to black or bronze vinyl frames. Andersen offers the 100 Series in dark exterior colors and states the exteriors will not fade, flake, blister or peel, with a finish warranty behind that claim.
The second is frame profile. A stronger material allows narrower frames for the same opening, which is the same argument fiberglass makes against vinyl. Compare the visible glass area on the actual units quoted, not the brochure photographs.
What Fibrex is not: it is not fiberglass, which is glass fiber in resin, and it is not vinyl. A salesperson comparing it to either is simplifying. That distinction matters when you line up quotes, because the three materials carry different warranties and different price positions.
Available styles
Andersen publishes 100 Series product pages for single-hung, casement, awning, gliding, picture and specialty shape windows, plus gliding and hinged patio doors. Note what is absent: there is no 100 Series double-hung window. If your house has double-hung windows and you want to keep both sashes operable, this line does not do it, and that single fact removes it from a lot of projects.
Energy performance
Andersen states that many 100 Series configurations are ENERGY STAR certified. Certification follows the glass package and the climate zone, not the series, so the brochure tells you nothing about the window in your quote.
Andersen does not publish a summary U-factor range for the line. A dealer page cites 0.29 with a 0.21 SHGC for a configuration it sells, and a third-party brand guide cites 0.27 to 0.30. Treat both as indicative. The number that counts is the NFRC label on the unit quoted, and Andersen publishes certified performance data per product in its trade product guides.
Warranty
Andersen’s warranty is branded Owner-to-Owner and, unlike many competitors, Andersen states it transfers when you sell the home. That is a genuine differentiator worth checking against whatever else you are quoting.
Dealers consistently describe the 100 Series terms as 20 years on glass and 10 years on non-glass components, with the exterior finish covered for 10 years against flaking, blistering, cracking, pitting, corrosion and loss of adhesion. Those specific terms come from dealer documentation rather than from a figure Andersen publishes on its main product pages, so read the current warranty document before you sign anything.
Price position
Andersen does not publish installed prices, and neither do we invent them. The only figure we found is a third-party brand guide citing $350 to $550 for a 24 by 38 inch single-hung unit only, which excludes installation, disposal, trim and everything else that makes up a quote.
For a realistic project number, our published vinyl and composite territory runs $450 to $1,600 per window installed. Put your own quote through the Window Quote Analyzer, or build a range with the cost calculator.
Installation and maintenance
The 100 Series is sold through Andersen dealers, certified contractors and the Andersen at Home Depot program, which means the same window can arrive with very different installation and service behind it. Ask who is doing the work, not just whose badge is on the frame, and confirm whether the quote is an insert or a full-frame replacement. That decision moves the price more than the brand does: see insert vs. full-frame.
Maintenance is minimal by design. Andersen states the exteriors do not need painting and the finish is covered for 10 years. Fibrex is not a paintable surface in the way fiberglass is, so the color you choose is the color you keep.
Reasons homeowners consider it
- A transferable warranty, when most competitors’ lifetime coverage stops at the sale of the house
- Dark exterior colors without the heat and movement objections that follow dark vinyl
- A material story that is neither vinyl nor a premium-priced fiberglass line
- Wide availability, including through Home Depot
Potential drawbacks
- No double-hung option in this series
- Andersen publishes no U-factor range for the line, so every energy comparison has to be done unit by unit
- Non-glass coverage of 10 years is shorter than the lifetime headline some vinyl competitors advertise, although those often stop being lifetime when you sell
- The finish is not repaintable in the way a fiberglass frame is
Who it may suit, and who may not
It suits a homeowner who wants dark exteriors, values a warranty that survives a house sale, and is replacing casements, gliders, picture or specialty windows. It suits less well a house full of double-hung windows, or an owner who wants the longest published material lifespan and is willing to pay fiberglass prices for it.
Alternatives worth pricing
- Pella 250 Series, vinyl, with lifetime coverage on non-glass components that converts to 10 transferable years when you sell, and a double-hung option. Head to head: Andersen 100 vs Pella 250.
- Pella Impervia, fiberglass, if the priority is the longest published lifespan and the slimmest frames.
- Marvin Essential, fiberglass, a comparable step up in material for a similar reason.
- A quality regional vinyl line, frequently quoted below national brands for equivalent specifications.
Official sources
- Andersen 100 Series single-hung window
- 100 Series casement window, with trade product guides
- 100 Series specialty shapes, with color counts
- Andersen warranty documentation
- ENERGY STAR criteria by climate zone
We earn nothing from these links. Specifications vary by configuration and change between model years; the verification date is in the summary table.