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An arched door asks more of its materials than a rectangular one. The curve is the attraction — and it is also where most of the engineering risk sits. Wood moves in straight lines; the arch asks it to hold a radius. This page is written for people who specify, buy, or sell this kind of entrance, and it is organized the way a specification meeting should be: failure points first, numbers second, then the build process and the paperwork you can request.
Three field failures account for most service calls, and each one is preventable at the design stage.
1. The springline opens. The springline is the point where the vertical jamb hands off to the curve. If the curved head is a thin bent lamination held at a different moisture state than the straight stiles, the joint opens and closes with every season. The countermeasure is to build the head as a laminated stack of staves that share the grain direction of the stiles, machined and assembled at the same target moisture content, so the whole frame moves as one assembly.
2. Individual lites overheat or leak. A divided-light grid means many sealed edges instead of one large pane. Small lites are kinder to the frame, but each carries its own seal, its own thermal stress, and its own chance of failure. Tempered glass is standard wherever local codes require it — which is most residential markets. Because every pane sits in its own removable beading, a damaged unit is swapped on its own — the remaining door stays in the opening.
3. The pair sags on wide openings. Two leaves multiply the hinge load. Three ball-bearing hinges per leaf, each rated for the leaf weight, keeps a door square instead of letting it drag across the threshold within a few years. The passive leaf should carry top-and-bottom shoot bolts so the frame receives the load, not the latch alone.
Any factory can use the words "solid wood." The specification sheet is where claims become testable. Before you compare quotes, request these six figures:
Parameter | What to request | Why it matters |
Moisture content | 8–12% at machining, re-verified at dispatch | Timber outside this band moves after installation; the record proves the discipline |
Leaf weight | Stated in kg per leaf at your thickness | Weight is what the hinges, frame, and floor must carry |
Hinge rating | Three hinges per leaf, each rated above the leaf weight | Prevents the classic double-door sag |
Glazing spec | Sealed double units; lite thickness and coating stated | Determines thermal, safety, and acoustic performance |
Sound data | Assembly STC range if available | Mass-based attenuation — the honest way to discuss noise |
Center-of-glass value | Thermal transmittance for the chosen glazing | Energy code submissions often require it |
Two of these — hinge count and moisture records — are where corners get cut. A door that arrives with two hinges per leaf or without a dispatch moisture record will cost more over ten years than the price difference suggests.
All four standard species make a sound exterior door. The useful question is which trade-off fits the site.
Species | What it rewards | What it costs | Best fit |
Red Oak | Bold grain, deep stain response, mid-tier price | Open pores demand a disciplined finish schedule | Sheltered entries, Craftsman and transitional elevations |
White Oak | Naturally water-tolerant pore structure, tight figure | Higher price; grain can read muted under clear coats | Coastal sites, rain-exposed entries, contemporary work |
African Mahogany | Fine texture, predictable stability | Softer than oak; watch impact points | Classic and Mediterranean facades |
Black Walnut | Rich dark tone, refined figure | Cost; UV sensitivity in direct sun | Shaded entries and interior-facing doors |
For white oak, quarter-sawn stock is the default for exterior use: the figure runs straighter and the board moves less across its width when humidity swings. For any species, confirm the coating schedule covers the top and bottom edges — the two faces that see standing water first.
The glazing grid earns its place two ways: it lets light deep into the hall, and it keeps each lite small enough that thermal stress stays manageable. A grid of individual sealed units behaves differently from one large pane — fewer square meters of glass under tension, more sealed edges to maintain.
Options are specified per project: clear, frosted, fluted or reeded patterns, smoked or tinted glass, and Low-E coatings with argon fill where energy codes demand it. Where storm protection or security ratings are required, laminated glass units can be substituted. Whatever the choice, each pane is installed with removable beading on both sides, so a single damaged unit is repaired in place without disturbing the rest of the door.
On a double-leaf door, hardware is structural. Three adjustable ball-bearing hinges per leaf carry the weight and allow re-alignment after the building settles. The lock package starts with a keyed deadbolt; multi-point systems with top-and-bottom shoot bolts are the standard upgrade for insurance-conscious markets. Handing must be confirmed before production — it determines which leaf is active, where the bolts sit, and how the pair seals at the meeting stile. Smart-lock preparation and custom handle sets can be machined to the buyer's templates at the factory.
Production follows nine gates, and each gate has a check that can be documented:
Timber intake — species and grade verified against the order
Conditioning — stock brought to the target moisture range
Arch lamination — staves glued and clamped to the confirmed radius
Frame joinery — stiles, rails, and floating panels assembled
Glazing fabrication — units built and sealed to the spec
Coating build — base, topcoats, and edge sealing applied and cured
Hardware routing — mortises and drillings cut to the buyer's templates
Pair fitting — both leaves hung together; seam, crown, and panel lines aligned
Crating — export packaging with edge protection and a moisture barrier
Ask which gates produce written records. A factory that can show the paperwork for the first two is a factory that understands the product.
To move from inquiry to proposal, send: the opening dimensions (or a survey or template for existing masonry), door configuration, wood species, finish direction, glazing preference, hardware requirements, quantity, and destination market. In return you receive: a drawing-based proposal with the arch radius confirmed, a written specification, a production schedule, and — on request — batch moisture records, coating documentation, and the crating plan.
Parameter | Available options |
Type | Solid hardwood exterior double door, arched head |
Construction | Laminated arch staves; stile-and-rail frame; floating panels |
Species | Red Oak, White Oak, African Mahogany, Black Walnut; others on request |
Glazing | Clear, frosted, fluted, smoked, Low-E, argon-filled; laminated on request |
Finish | Matte black opaque (shown), natural clear, custom stain or RAL-matched paint |
Hardware | Ball-bearing hinges, deadbolt, multi-point upgrade, smart-lock prep |
Configuration | Double leaf; sidelights, transom, or single leaf on request |
Dimensions | To drawing; leaf thickness from 44 mm |
Supply mode | Slab or pre-hung with matching frame and seals |
Lead time | 6–10 weeks from drawing approval, confirmed in writing |
Can the arch follow an opening that is already built? Yes — from survey measurements or a site-made template of the opening itself. The radius is locked on the shop drawing before production starts.
How do the two leaves stay aligned over time? Both leaves are hung and fitted as a set before finishing, and the adjustable hinges allow re-truing after the building settles. Shoot bolts on the passive leaf keep the meeting stile from flexing.
What does the finish need over its life? An annual check of edges, glazing beads, and seals, plus a recoat every three to five years depending on sun exposure. Scuffs and scratches are handled by local touch-up — the coating never has to be fully removed.
Should we order slab or pre-hung? If the opening is within tolerance and site carpentry is limited, pre-hung saves labor. If the frame condition is uncertain, a slab with a site-fitted frame is the safer route. We will tell you which applies to your site.
What is the lead time? Six to ten weeks from approval of the shop drawings, depending on species, glazing, and volume. A confirmed delivery date accompanies your written quotation.
How do the doors ship? In export crates with edge protection and a moisture barrier, with acclimation guidance for the first days on site. For multi-unit projects, crates can be grouped by building or floor.
Send the opening survey and your specification — the proposal comes back with the radius drawn, the numbers on paper, and the gates that will be audited. That is the point of the whole exercise: commissioning the engineering, not merely the door.
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