Quaker Windows & Doors Quartz TimberLine: 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. TimberLine is a luxury-tier product that reaches valley homes through architects and custom builders; this is the owner's reference for what was specified and what to do when it needs work.

What the Quartz TimberLine Actually Is

Most aluminum-clad wood windows start as a wood window and get a metal skin. Quartz TimberLine goes the other direction: it is Quaker's OptiCore aluminum frame — the same filled-core, thermally broken 6063 extrusion used on Quartz CityLine — with a wood interior applied to the room side. That matters for how it behaves. The structure, the weather seal, and the thermal break are all aluminum and polyurethane; the wood is finish, not frame. It is why Quaker can attach a lifetime no-rot warranty to the interior wood, and why the published structural ratings look more like a commercial window than a clad-wood one.

Dimensions: 5-7/8 inches overall frame depth, 4-9/16 from nail fin to interior, with an optional 4-1/8-inch frame that omits the wood extension for thin-wall or retrofit conditions. Exterior sightlines are 2-7/8 inches on operators, matching CityLine so the two can be mixed on one elevation. Pine is the standard interior; Quaker's finish page says it can supply "many of the popular wood species" or source an exotic on request, but it does not publish a species list for TimberLine the way it does for its Insight line (alder, Douglas fir, radiata pine, white oak). If you are matching a species for a repair, the original order paperwork is the place to look.

The window catalog is picture, casement (24 to 48 inches wide, up to 84 tall), awning, and a 90-degree corner. Doors are the W-Series: a 5-inch-frame sliding door in two- to four-panel configurations and a 4-1/2-inch-frame swinging door, single or French pair, inswing or outswing, with a five-point lock and 10-inch bottom rail. There is no TimberLine multi-slide; a project that wanted a wood-interior wall of glass typically paired TimberLine windows with a CityLine M-Series door in a matching exterior color.

Exterior finish is the CityLine palette: about 30 standard powder-coat colors to FGIA 2604, 2605 as an upgrade, textured and heat-reflective darks. Hardware is Amesbury Truth on casements and Hoppe on awnings, with FlexScreen screens. Quaker also sells a lighter residential clad-wood line called TimberVu through its residential division; the two share the name but not the frame.

One naming note, since this is a Wood Windows page: Quaker holds the mark "TimberLine Wood Windows and Doors." Quartz TimberLine is a Quaker product with no connection to Wood Windows Inc; we are not a Quaker or Quartz dealer.

The Numbers That Matter

Quaker publishes per-product performance on its detail pages, and the TimberLine picture window is the strongest sheet in the collection: AW-PG90, 90.22 psf design pressure, 0.01 cfm/ft² air infiltration, 12.11 psf water, U-factor 0.14 to 0.28, SHGC 0.19 to 0.29, condensation resistance 51 to 65 on a 60-by-60 test unit. The casement and awning test AW-PG70 at 70.18 psf with U-factors of 0.17 to 0.29 and 0.17 to 0.28 respectively; awning SHGC runs to 0.36 on clear-glass packages.

Those ranges span Quaker's glazing menu, from a basic 1-inch dual-pane to a 1-3/8-inch triple-pane with Super Spacer warm-edge and argon. The bottom of each range is triple-pane; a standard Low-E dual-pane lands in the high 0.20s. For a zone 5B home that wants every unit under 0.30, dual-pane does it on fixed units and sits near the line on operators. Quaker's claim that TimberLine "provides the lowest U-factor ratings" in the collection is defensible but slim — CityLine's published numbers are within a hundredth — and the real advantage is surface temperature: the same U-factor with wood on the room side means a warmer sill and less frost on a 10-degree morning.

Doors publish more modestly. The W-Series slider is AW-PG50 with U-factors of 0.34 to 0.39 and condensation resistance of 42 to 45; the swing door is AW-50 at 0.37 to 0.41. Those are typical numbers for large aluminum-framed doors and a reminder that the door, not the windows, sets the comfort floor in a great room.

Sound and altitude: triple-pane laminated packages are available for STC ratings, and Quaker's warranty requires capillary tubes above 3,500 feet, with glass coverage reduced to 10 years there. That line matters for a McCall cabin; on the valley floor it does not apply.

How It Ages in Idaho — and What Usually Fails

TimberLine is too new to have a 25-year record anywhere, so the honest field notes are about its construction type — thermally broken architectural aluminum with a wood interior facing and large insulated glass — and what zone 5B does to windows built that way over 10 to 25 years:

• Insulated glass seal failure on large lites. The dominant long-term repair on big fixed glass. Wide spacers on 8- and 10-foot units carry more thermal stress than a small casement, and fog or a water line between panes on a south or west elevation is the usual first symptom in the second decade. The frame is unaffected, but the glass is heavy and the replacement is priced accordingly.
• Interior wood at the sill. The frame is warm, but on the coldest mornings with indoor humidity above 40% the glass edge still sweats onto the wood stool and bottom rail. Windows of this construction commonly show lifted finish and gray water staining on the interior wood within 10 years — cosmetic at first, and excluded from the no-rot warranty because it is interior condensation. Winter humidity control and timely refinishing are the whole prevention program.
• W-Series door hardware. Five-point locks, rollers and tracks on a 10-inch-rail sliding panel wear under the panel's weight; adjustment and roller replacement are routine.
• Powder-coat chalking. FGIA 2604 dark colors on unshaded exposure commonly chalk after 12–15 years; 2605 holds longer. Cosmetic.
• The doors set the comfort floor. At U 0.34–0.41 the W-Series doors will show condensation and cold-edge drafts well before the windows do — not a defect, just the published number — and their sill weeps need to stay clear.

Warranty and Service, Locally

Quaker's Limited Warranty for Luxury Homes runs 20 years on insulated glass (10 years on oversized or laminated units and on glass above 3,500 feet), 10 years on 2604 exterior finish and 20 on 2605, 10 years on hardware, and one year on labor and on factory interior wood finish. TimberLine adds the OptiCore Limited Lifetime No Rot Warranty on the interior wood cladding against decay from exterior moisture, valid while the original homeowner owns and lives in the house; rot from interior condensation is excluded. The document is non-transferable, which is a real difference from Marvin and Kolbe on a home that has been sold.

Warranty claims go through Quaker and the dealer or builder that originally supplied the units; original owners with a fogged lite inside 20 years should start there. 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 TimberLine units we replace fogged glass including oversized picture lites, service casement and awning hardware, adjust and re-roller W-Series doors, renew weatherstrip and sill drainage, and refinish stained interior wood. When replacement is the right answer, the like-for-like lines we carry are Kolbe VistaLuxe WD (12 interior species, transferable warranty), Marvin Ultimate, and Andersen E-Series — all wood-interior, aluminum-exterior, and serviced from twenty minutes away.

Have Quartz TimberLine windows or doors that are fogging, sticking, or staining at the sill? Use the form on this page or call (208) 376-2200.

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