Quaker Windows & Doors Quartz CityLine: Specs, Testing Data & Idaho Fit

Wood Windows Inc is not an authorized Quaker Windows & Doors dealer. We service, repair, and replace Quaker windows and doors throughout the Treasure Valley.

Specifications & Testing Data

Wood Windows Inc is not an authorized Quaker Windows & Doors dealer. We service, repair, and replace Quaker and Quartz windows and doors throughout the Treasure Valley. CityLine reaches valley homes through architects and custom builders; this page is for the owners of those homes and for anyone comparing architectural aluminum before they buy.

What the Quartz CityLine Actually Is

Quaker Window Products has built windows in Freeburg, Missouri since 1949, and for most of that time it was a commercial and residential manufacturer that Idaho homeowners never heard of. Quartz is the company's luxury division, and CityLine is its flagship aluminum series — the one Quaker points to when it says OptiCore came out of the commercial catalog.

The construction is straightforward once you have held a cutaway. The frame is 6063-T6 architectural aluminum, 4-1/8 inches deep, with 4-9/16 and 6-9/16-inch jamb depths for 2x4 and 2x6 walls. Instead of a hollow thermally broken extrusion, Quaker pours Azo-Core polyurethane foam into the frame and then debridges — machines away — the aluminum bridge, leaving a filled core that carries load and stops heat. Corners are mitered at 45 degrees with sealant-injected double corner keys. Exterior sightlines run 2-7/8 inches on operators; a fixed picture unit set directly in the frame shows about 1-5/8 inches.

The window catalog is short and modern: direct set (fixed) to 144 by 144 inches, roto and push-out casements to 48 by 96, awnings to 72 by 84, and a 90-degree corner window shipped knocked-down for site glazing. Square (C600) and beveled (C605) glazing stops change the exterior look. Doors run on two platforms. The C-Series 5-5/8-inch frame handles sliding doors — two panels to 14 feet wide, four panels to 20 feet, all 12 feet tall — plus inswing and outswing swing doors and a lock box door. The M-Series multi-slide takes panels to 84 by 144 inches in two to six panels with pocketing and bi-parting, on a standard, flush, or staggered flush sill, with 3-inch sightlines and a 4-1/2-inch bottom rail. There is no lift & slide, bi-fold, or pivot door in the Quartz collection as of this writing.

Finishes are where CityLine feels commercial in a good way: roughly 30 standard powder-coat colors to FGIA 2604, an upgrade to 2605, seven Class I anodized finishes, textured and heat-reflective darks, and two-tone (one color inside, another outside) on every CityLine product. Hardware is Amesbury Truth with a concealed hinge and multipoint lock lever; screens are FlexScreen with a lifetime warranty.

Inside the collection, CityLine sits beside the wood-interior Quartz TimberLine and the narrow steel-look Quartz EdgeLine. Quaker's residential division sells a related CityVu line built on lighter framing.

The Numbers That Matter

Quaker publishes more performance data than most luxury brands, and that lets us be specific. On the September 2024 brochure, the direct set carries AW-PG100 — 100 psf structural, 0.01 cfm air infiltration, 12.11 psf water — with U-factors of 0.15 to 0.29 and SHGC of 0.24 to 0.36 across glass packages. Casements and awnings carry AW-PG70 and 0.20 to 0.32. The product detail pages, updated more recently, show 0.14 to 0.28 on the picture and 0.17 to 0.29 on the casement. The casement technical data sheet pins a single point: 0.30 U-factor and 0.19 SHGC with Cardinal 366 Low-E and argon in the standard 1-inch dual-pane unit.

Read those together and the lesson is clear. The 0.14–0.17 numbers are triple-pane in a 1-3/8-inch glazing pocket; the 0.29–0.32 numbers are basic dual-pane. Aluminum still conducts more than wood, so the frame leans on the glass. Against the 0.30 target we recommend for climate zone 5B, dual-pane 366 gets there on a direct set and lands right at the line on a casement; triple-pane buys real margin and a warmer interior frame surface. Condensation resistance runs 49 to 68 on the picture unit, which is respectable for aluminum.

Doors are a different tier. The C-Series slider tests LC-50 with U-factors of 0.29 to 0.31, the swing door 0.27 to 0.31, the lock box door 0.39, and the M-Series multi-slide is R-15 with 0.34 to 0.39. That R-15 rating on the multi-slide is the number to notice: a 20-foot glass wall with a 15 psf design pressure belongs on a sheltered patio, not a ridge lot. Quaker states that all CityLine and TimberLine windows exceed ENERGY STAR requirements in every state; the NFRC label on each unit is the thing to check rather than the blanket claim.

Sound is a genuine strength. Quaker publishes STC 32 for the 1-inch dual-pane casement, 35 laminated, and 38 for 1-3/8-inch triple-pane laminated — useful next to Chinden or under the Boise Airport approach.

How It Ages in Idaho — and What Usually Fails

CityLine is too new for a 25-year record anywhere, so the honest field notes belong to its construction type — filled-core, thermally broken architectural aluminum with very large insulated glass and big sliding doors. Over 10 to 25 years in zone 5B, windows and doors of this construction commonly show:

• Insulated glass seal failure on large lites. The dominant long-term repair on 10- and 12-foot direct sets. Wide spacers on big glass carry more thermal stress than a small casement, and a fog line or water between panes on a south or west elevation is the usual first symptom in the second decade. The frame is fine; the glass is heavy and often needs a lift, which is what drives the repair price.
• Cold-edge condensation on operators. At 0.30 dual-pane, a casement glass edge will sweat on the coldest mornings at normal indoor humidity. On an all-aluminum interior the water dries harmlessly, but chronic condensation stains the sill and, over many winters, can corrode hardware. Triple-pane units and humidity control both prevent it.
• Multi-slide doors. The M-Series is where most service calls on this construction type land: rollers flatten under 84-by-144 panels, tracks wear, sill weeps clog with debris, and the flush-sill option in particular depends on drainage staying clear. The R-15 rating also means a multi-slide on an exposed site will rattle and leak air in wind long before the AW-rated windows beside it do.
• Powder-coat chalking. FGIA 2604 dark exteriors on unshaded exposure commonly chalk after 12–15 years; 2605 and anodized finishes hold longer. Cosmetic.
• Corner-key sealant and big-sash hardware. Mitered aluminum corners depend on injected sealant, and multipoint locks and roto operators on 48-by-96 casements wear; both are second-decade items.

Warranty and Service, Locally

Quaker's Limited Warranty for Luxury Homes (June 2024) covers factory insulated glass for 20 years, or 10 years on oversized and laminated units; finish for 10 years on 2604 powder coat, 20 years on 2605, and 5 years on anodized; hardware for 10 years; and labor for the first year. It is non-transferable, and above 3,500 feet a capillary tube is required and glass coverage drops to 10 years — irrelevant at 2,700 feet in the valley, relevant on a Bogus Basin Road build.

Warranty claims go through Quaker and the dealer or builder that originally supplied the units. Original owners with a fogged lite inside the coverage window should start there, with paperwork. Second owners are outside the warranty entirely.

Wood Windows Inc has set architectural windows and big doors in the Treasure Valley for 46 years with our own employee crews out of Garden City, never subcontractors. On CityLine units we replace fogged glass including oversized direct sets, service casement hardware and multipoint locks, adjust and re-roller M-Series and C-Series doors, renew weatherstrip and clear sill drainage. When replacement is the answer, the like-for-like architectural systems we carry are Kolbe VistaLuxe AL — tilt-turn, lift & slide, folding and pivot doors, transferable warranty — and Marvin Modern, fiberglass with a warmer frame and a PG40 multi-slide. Both are serviced from twenty minutes away, not a national queue.

Have Quartz CityLine windows or doors that are fogging, sticking, or dragging on the track? Use the form on this page or call (208) 376-2200.

Last reviewed 2026-09-10 by Wood Windows Inc — (208) 376-2200