Curtain Wall vs Storefront vs Window Wall — China Buyer's Spec Guide
How aluminum curtain wall, storefront, and window wall systems differ — span, structure, performance, cost — and what each means when you source the extrusions and systems from China.
- ›Curtain wall is a non-load-bearing facade hung OUTSIDE the floor slabs, spanning multiple storeys — used on mid- and high-rise buildings.
- ›Storefront is a lower-rise system (typically ≤ ~3 m / one to two storeys) set between floor and structure above — used at grade for retail and commercial entrances.
- ›Window wall sits BETWEEN the floor slabs (slab-to-slab), installed floor-by-floor from the inside — common on mid-rise residential because it is cheaper to install.
- ›For China sourcing: curtain wall buyers usually need a system house (engineering + testing); storefront and window wall can often be met by a profile extruder + local fabricator.
- ›Match the right factory type to the system — a pure extruder cannot warrant a tested curtain-wall system; a system house is overkill (and costlier) for basic storefront.
Why the distinction matters before you source
These three aluminum-and-glass systems look similar but are engineered, priced, and warranted differently. Picking the wrong one — or briefing a Chinese supplier with the wrong term — leads to mismatched quotes, failed performance tests, and install delays.
The decisive difference is how the system relates to the building's floor slabs, which in turn drives span, wind-load engineering, water-tightness testing, and who can actually supply it.
Side-by-side comparison
The fastest way to tell them apart and brief a supplier correctly:
| Attribute | Curtain wall | Storefront | Window wall |
|---|---|---|---|
| Relationship to slab | Hung outside / in front of slabs (continuous) | Set below the structure at grade | Fits between slabs (slab-to-slab) |
| Typical height | Multi-storey, mid- to high-rise | ≤ ~3 m, 1–2 storeys | Floor-to-floor, mid-rise |
| Load path | Non-load-bearing; transfers wind load to slabs via anchors | Non-load-bearing; framed opening | Non-load-bearing; sits on slab below |
| Install | From outside, often unitized panels craned in | From inside or outside, stick-built | From inside, floor-by-floor (no exterior access) |
| Performance testing | Highest — air/water/structural (e.g. AAMA / EN 13830) | Moderate | Moderate; slab-edge / inter-floor detailing critical |
| Relative cost | Highest (engineering + unitized) | Lowest | Lower than curtain wall (cheaper install) |
| China supplier type | System house (engineered + tested system) | Profile extruder + fabricator | Profile extruder + fabricator / system |
Standards shown are the common governing references for each system type; they are industry-applicable, not a certification claim about any specific supplier.
What each means for your China sourcing
Curtain wall: you are buying an engineered SYSTEM, not just profiles. Look for a supplier (system house) that can provide structural calculations, thermal/water test reports for the specific system series, and unitized fabrication if the project requires it. A mill that only extrudes profiles cannot warrant a curtain-wall system's performance.
Storefront: usually the simplest. A capable profile extruder plus a local fabricator can meet most grade-level retail storefronts. Confirm glass pocket sizes, thermal break (if required by climate), and finish (anodized vs powder-coat).
Window wall: the profiles are straightforward, but the slab-edge and inter-floor junction details drive water-tightness and acoustic/fire separation. Brief the supplier on slab dimensions and the inter-floor strategy up front.
Sourcing-risk checklist (all three)
Confirm the supplier's identity and registration before deep engagement — China company USCC can be checked on the public registry (gsxt.gov.cn). Identity-verified suppliers are the baseline; see our methodology.
Ask for the specific system series and any test reports by name — generic 'we make curtain wall' is not a system warranty.
Match factory type to system type (above). For curtain wall specifically, a system house is usually the right counterparty, not a bare extruder.
Get pricing and lead time in writing via RFQ — prices on this site are market signals, not supplier quotes.
Frequently asked questions
Is window wall cheaper than curtain wall?
Generally yes. Window wall installs floor-by-floor from inside (no exterior cranes or swing stages) and uses simpler framing, so both the system and the installation cost less than a unitized curtain wall — which is why it is common on mid-rise residential.
Can one Chinese factory supply all three systems?
A large system house often can, but many Chinese suppliers specialize. Pure profile extruders are well-suited to storefront and window wall; engineered, tested curtain-wall systems usually come from dedicated system houses. Match the supplier type to the system you actually need.
Which standards govern curtain wall from China?
Common governing references include GB/T 21086 (China) and EN 13830 (Europe), with air/water/structural performance tested to standards such as the AAMA series. These are industry-applicable references; always confirm which test reports a supplier holds for the specific system series.
What information should I give a supplier to get an accurate quote?
The system type (curtain wall / storefront / window wall), building height and slab dimensions, wind-load/seismic requirements, glass make-up and U-value target, finish (anodized or powder-coat), and quantity. Send it as an RFQ so MOQ, lead time and price come back directly.
This guide is written from public standards and industry-common knowledge, not supplier claims. Confirm system series, test reports, prices and certifications directly with the supplier via RFQ.
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