Tilt and turn windows outside Europe: what US and AU accept

The North American Fenestration Standard, AAMA/WDMA/CSA 101/I.S.2/A440, keeps a list of operator types with three-letter codes. Awning, hopper and projected windows sit under AP. Casement is C, hung is H, horizontal sliding is HS. A sash that tilts from the top and swings inward from the side is DAW, a dual-action window, and the glossary in the same standard adds the plain-English gloss: also referred to as a tilt-turn window.

That is not a translation quirk. The operator type decides the gateway test size, the minimum sample the laboratory has to test before a class can be claimed at all. A unit listed as AP is tested as an awning. The same hardware on the same sash, listed as DAW, is tested as a dual-action window. The distinction lands on the label, and the label is what the permit office reads.

On the European side the same product is opening type E in the hardware standard EN 13126-1, listed as tilt and turn, tilt-first, with the terminology drawn from EN 12519. The standard recognises both hardware sequences: tilt before turn, and turn before tilt. The sequence is a gearbox choice rather than a product class, and it is the choice that most often needs restating when the unit leaves Europe.

NAFS sorts windows and doors into four performance classes, each with a minimum performance grade to enter: R at PG15, LC at PG25, CW at PG30 and AW at PG40. The grade is a design pressure in pounds per square foot — 15, 25, 30 and 40 psf, or 720, 1200, 1440 and 1920 Pa. Earlier editions of the standard ran five classes, R, LC, C, HC and AW. The C and HC classes were removed and CW added, which is why older quotations and older test reports quote a class the current standard no longer issues.

Entering a class means clearing the gateway requirements: a minimum gateway test size, air leakage resistance, structural design load and overload, water penetration, forced-entry resistance and the auxiliary tests. Above the gateway the same product can be tested higher, which is how a CW unit becomes CW-PG65 rather than CW-PG30.

The test set is short and worth quoting on a submittal. Structural loading runs at 1.5 times the design pressure. Water resistance runs at 15 percent of the design pressure for the R, LC and CW classes and 20 percent for AW. Air leakage is measured under ASTM E283, water under ASTM E331 or the cyclic ASTM E547. NAFS also sets different minimum air-leakage values for compression-seal products and for sliding products, which is the reason an inward-swinging sash with multi-point locking, six to twelve points around the perimeter, sits in the tighter of the two families.

One boundary to keep straight: NAFS covers structure, air, water and forced entry. It says nothing about energy. Thermal performance is rated separately, on the NFRC label. A CW-PG30 rating and a U-factor are two different documents, and a project that is energy rated needs both. The edition that counts on a project is the edition the local building code references, which can lag the newest one by a cycle.

Section R310 of the International Residential Code requires every sleeping room to have an operable emergency escape and rescue opening. The net clear opening must be at least 5.7 square feet, with a minimum clear height of 24 inches and a minimum clear width of 20 inches, and the bottom of the clear opening no more than 44 inches above the floor. The dimensions have to come from normal operation of the opening, from the inside, and the opening has to work without keys, tools or special knowledge.

Read against a dual-action window, that settles which position is the escape position. The tilt action cannot reach 5.7 square feet on any sash in the range. The turn position is the escape position, and the net clear opening has to be quoted for the turn position, at the ordered size, after the hardware and the seals are in place.

The second half of R310 lands on the handle. A key-locking handle, the standard European answer to child safety, fails the requirement that the opening work without a key on a window that serves as the escape opening. Key locking belongs on the non-escape openings of the same room, and the schedule has to say which is which. Where an opening control device is fitted, the code path is ASTM F2090, and the device is permitted only up to 70 inches above the finished floor.

The position of the US Consumer Product Safety Commission on window falls is blunt. Install window stops so that windows open no more than four inches. Install window guards on windows up to the sixth floor that adults and older children can open in a fire. Never depend on a screen. Open from the top where the design allows it, and keep furniture away from the glass.

The data behind it is current. The Commission estimates about 5,600 children aged 12 and under were treated in emergency departments in 2024 after falling from a window, and roughly one in three of those cases was admitted. It is aware of at least 25 deaths among children aged 12 and under between 2021 and 2023, and about 80 percent of those deaths fell between May and October.

This is consumer-safety guidance rather than a construction clause, but it lands on the product specification all the same. The bottom gap on a factory unit in the tilt position is a design value, and on most systems it runs well past four inches. Where the project carries a fall-protection requirement, the tilt position is not the answer; a stop or a guard is.

AS 2047, Windows and External Glazed Doors in Buildings, is the performance standard behind Australian window selection. The edition in use is AS 2047:2014 with Amendment 2:2017. The National Construction Code, 2022 edition, Volume Two, calls it up under clause H1D8 as the deemed-to-satisfy path for the structural performance requirement H1P1 and the weatherproofing requirement H2P2 on Class 1 and Class 10 buildings.

The standard runs five tests on the complete assembly: deflection under positive and negative design wind pressure, ultimate strength to failure at 1.5 times design pressure, water penetration resistance, air infiltration and operating force. The scope is written in product types — fixed, awning, casement, sliding and louvre windows; sliding and swinging glazed doors; French doors; bi-fold doors; shopfronts and window walls. A dual-action sash is not a named type in that list. The assembly is rated as what it is, and the gearbox is not the subject of the test.

What the rating is matched to is the wind class of the site under AS 4055, from N1 in sheltered terrain through N6 in exposed non-cyclonic regions, with C1 to C4 for cyclonic regions. Each product carries a permanent performance label showing its wind and water ratings, and that label is what gets checked against the wind class on the structural drawings. Installation sits in Part 8.2 of the ABCB Housing Provisions 2022; glass selection and installation sit in AS 1288.

NCC 2022, Housing Provisions, clause 11.3.7 covers openable windows in bedrooms. Where the floor below the window is 2 m or more above the surface beneath, the opening must be protected. Where the lowest level of the window opening is less than 1.7 m above the floor, the openable portion needs a restricting device or a screen that does not allow a 125 mm sphere to pass, that resists an outward horizontal action of 250 N, and that has a child-resistant release mechanism if it can be removed, unlocked or overridden. A device that can be removed also needs a barrier of at least 865 mm above the floor. Where the openable part is at least 1.7 m above the floor, no further protection is required.

Clause 11.3.8 covers rooms other than bedrooms: protection where the floor below is 4 m or more, in the form of a barrier at least 865 mm above the floor that stops a 125 mm sphere and carries no climbable elements between 150 mm and 760 mm. The performance requirement behind both, H5P2, puts the trigger at 1 m or more for a fall through an opening other than an openable window, 2 m through an openable window in a bedroom and 4 m through an openable window anywhere else.

For a unit of this type the operative number is the tilt gap. The rule is a sphere test on the openable portion, so the bottom opening in the tilt position has to be measured rather than assumed. If a 125 mm sphere passes, the tilt position does not clear 11.3.7 and a restrictor is required. The release then has to defeat a child — a tool, a key or two hands — which is a different answer from the US question about keys, and one that has to be resolved per opening rather than per order.

The factory side of this is simpler than the code side. The platform is the same, the sash is the same, the multi-point locking is the same. What changes between the two markets is the document pack: a different test standard, a different label, a different restrictor and a different handle.

The table below is the checklist to run against any quotation that offers this hardware into either market.

Two markets, one sash. The engineering question in both is the same: which position carries the safety duty, and what stops the opening there. Get those two answers in writing and the rest of the specification is ordinary.

• The NAFS label in full: operator type DAW, performance class, performance grade and the maximum tested size behind the grade.
• The edition of AAMA/WDMA/CSA 101/I.S.2/A440 the report was written to, matched to the edition the project code references.
• The net clear opening of the sash in the turn position at the ordered size, after hardware and seals.
• The NFRC-rated U-factor and SHGC for the ordered glass build, as a separate document.
• The AS 2047 label showing wind class and water-penetration rating, matched to the AS 4055 class on the structural drawings.
• Restrictor evidence for every opening above the fall line: the measured tilt gap, the 125 mm sphere result, the 250 N result and the release mechanism.
• The hardware sequence declared per opening, tilt-first or turn-first, and the handle type where an escape or fall rule applies.