WALLS1. Measure.Place compressed FOIL BATT between top (or bottom) plate and nogging and mark length.2. Cut.fFOIL BATT should be cut square and make a close fit with contact to top timber, so as to prevent rotational air movement between cavities. Tight fit at bottom not necessary. One batt should fit each cavity. Any overlaps should be sealed by stapling or taping.3. Fix.The FOIL BATTt is fitted so that there is an approx. 45mm closed air gap between the FOIL BATT and plasterboard, and an additional 45mm insulating air gap between the FOIL BATTt and the normal foil wrap. (NB: no foil airspace with fibre batts.)(a) Staple one flange of the FOIL BATT to a stud side with approximately 5 staples.(b) Expand FOIL BATT and staple free edge to opposite stud, creating a shallow concertina profile – with narrow stud centres, gather up excess folds. For sloping top plates and uneven noggins, first staple FOIL BATT to the longest stud, then expand and staple to other stud. Crush and staple excess batt to the underside of the top timber. Trim away excess foil.May, 2006™Trademark of Wren Industries Pty. Ltd.STAPLINGINSTALLEDCONCERTINAFOIL BATTS ™INSTALLATION INSTRUCTIONS50mmoverlaptimbers clearfor gluingFLOORS1. Staple FOIL BATTS to lower sides of floor joists (approx. 5 staples) at a uniform maximum depth of 100mm to achieve the maximum R-value for winter. FOIL BATTS are expanded creating a shallow concertina profile – with narrow joist centres gather up excess folds. For 200mm “I” beams, FOIL BATTS are stapled at 100mm depth. FOIL BATTS are self supporting and sagging will not occur.2. Overlap adjoining FOIL BATTS by a minimum 50mm. No cutting is needed. Sealed overlaps are not necessary as heat flow is downward radiation in winter, ie. there is no convective winter heat loss from floors.3. FOIL BATTS should be installed as flooring is laid and not be exposed to wind or rain. Open joist ends can be covered if necessary for protection from wind during construction. Install FOIL BATTSpreferably after electrical, plumbing and ductwork are completed. 4. Ensure the upper foil surface is clean, bright and free of all sawdust and debris to obtain best thermal performance, i.e. level the tops of joists first before fitting FOIL BATTS, then fit the flooring.5. FOIL BATTS perforations are specifically designed for platform sheet flooring, where roof is not on. Holes are in concertina valleys to allow quick draining of any rain penetrating the floor during construction, as well as any moisture formed by possible condensation.6. Timbers can breathe because of FOIL BATTS deep airspaces and unsealed overlaps. Beware of alternate insulations that require substantial perforations for drainage and breathing. 7. The stated Total R-values are dependent on the creation of still air and zero air velocity beneath timber floors for both the airspace above and below FOIL BATTS, and the upward foil surface shielded from dust accumulation, which maximises total thermal performance. Enclosed building perimeters achieve this still air with: (i) Brick veneer or cavity brick construction – automatically creates still air. Ventilator plates are too small to permit high air speed and there is no need to block off or shield open joist ends.(ii) Weatherboard or fibro-cement cladding – minimise gaps between base boards and fix black close-weave shade cloth behind boards as a wind break. Open joist ends are wind shielded by the cladding itself.Open building perimeters (eg pole frame houses) require a perforated floor joist underlining to create still air and ensure breathing and drainage (eg building paper/foil). Open joist ends are wind shielded by the cladding itself. With 100mm joists, create two 50mm FOIL BATT airspaces which are surrounded by still air.8. Perforated FOIL BATTS can be installed under existing floors where there is adequate ground clearance. If there is a risk of condensation, then ensure that perforation holes are closest to the ground by reversing the folds of the stapling flanges.9. Under floor insulation does not require a 100% complete coverage, eg FOIL BATTS do not need to make a tight or close fit around ductwork.PERFORATED CONCERTINA FOIL BATTS FOIL BATTS in walls are not a sarking-type product, i.e. should not be exposed to the weather - wind or rain. External wall cladding is normally in place first, and batts are fitted after all electrical and plumbing work is completed (i.e. just before plastering). ELECTRICAL• Regulation approval for usage. • AS/NZS 3008.1.1 (1998) "Cable Selection Requirements" - Clause 3.4.3(d). Reflective foils have free circulation of air and do not contribute to any heat build-up in electrical cabling. Cables installed prior to 1989, and which are surrounded by bulk insulations, may overheat and fail. • AS/NZS 3000 (2000) " Wiring Rules" - Clause 5.7.3.7(ii). Avoidance of conductive building materials "may be satisfied by restraining the conductor by tying, lacing or clipping." Shrouds behind power-points are not necessary.PLUMBING•FOIL BATTS are simply placed in front or behind pipe work, whichever side is clearest for stapling, and cut to fit over taps or pipes where necessary. WREN IIW&F - 5/06
