Window Head Flashing Detail Nz

The head flashing upstand must be sealed to the face of the wall underlay with flexible flashing tape or an extra layer of wall underlay must be dropped from above to create a gravity drainage path out over the flashing.

Window head flashing detail nz. Figure 2 option 1 timber window head flashing tight to opening. Most head flashings for aluminium windows are extruded section manufactured to a range of standard widths. Figure 73d describes an alternative sill support detail for masonry veneer which includes a poured concrete extension to the slab edge under the window or door and uses a sill tray flashing as detailed for direct fixed cladding situations. Flashing upstands need to be increased by 25 mm in the extra high wind zone and a seal is required between the head flashing and the window flange in very high and extra high wind zones.

A curved or angled pediment over the centre window. View our interactive installation details for linea weatherboard and rab board. Scriber sealed to underside of head flashing aluminium window frame seal flashing to frame in vh and eh wind zones. Head flashing details from e2 as1 few flashings are folded to fit these days.

Galvanised iron head flashings were installed to the facing or to the timber cap and fitted behind the lap of the weatherboard above. Acceptable solution e2 as1 to new zealand building code clause e2 external moisture only applies to aluminium windows with flanges that. Designers should ensure that these details are specified and builders should ensure they are properly installed. Our test was conducted without the reliance on sealants foams or plastic back flashings achieving 4 500 kpa 312 kph wind speeds.

7 1 november 2017 window association of new zealand page 19 step c2. Head flashing a metal head flashing with a 15 slope is installed against the wall underlay and over the window frame to provide 10 mm cover to the face of the window frame. The top of the head facing was often finished with an inclined flat board to form a cap to the window over which the flashing was installed figure 10. A drainage and ventilation gap of 5 mm must be left between the bottom of the cladding above the flashing and the top of the sloped flashing.

The total upstand must be 40mm minimum. Wanz guide to e2 as1 amd. Option 1 where the head flashing fits firmly over the top window flange is the more traditional detail and is in branz s view the neater and safer solution figures 1 and 2.