Jan 11

QT Construction Detail

Slab & Floor

All foundations must comply with the relevant standards and local authority requirements, with appropriate consideration given to soil type. QT® EcoSeries Wall Panel is suitable for construction on concrete slab or suspended floors. The concrete slab can either be rebated or non-rebated. The slab rebate will need to be a minimum of 50mm below floor level and 100mm above paved level or 150mm above ground level (See local standards). To ensure a flush finish, the width of the slab rebate needs to allow for the thickness of the coating system, the thickness of the panel (40mm or 50mm), and the size of the extended wall cavity 20 – 50mm (30mm nom). Minimum ground clearances, must be maintained at all times during the life of the building. Insufficient clearance from the ground to the bottom of the wall panels will affect long-term durability.

Termites

The Building Code of Australia in conjunction with AS 3660 specifies the requirement for termite risk management. (See local standards).

The edge of a slab-on-ground may be used as a visual perimeter barrier. Provided that the slab edge is left exposed not less than 75mm above finished ground or paved level. The face of the perimeter must not be concealed by a flashing, rendered, tiled or clad.

The exposed edge of the slab must be kept clean and free of debris and regularly visually inspected for termite activity. QT® EcoSeries Wall Panel does not hold any nutritional value for ants or rodents.

Windows

Wherever possible windows and associated flashings should be installed prior to the installation of the QT EcoSeries Wall Panel. When ordering the window frame it is essential to plan where the window flange will be positioned either flush with the stud frame, flush with battens or even over the panel.

All materials that are susceptible to deterioration due to plastics migration or alkalinity of cement base products must be protected (check with product manufacturer).

Decorative Moulding

To provide added design flexibility, decorative mouldings or features can be made using QT To provide added design flexibility, decorative mouldings or features can be made using QT EcoSeries Wall Panels. The panel can be cut into bands or laminate multiple layers and shape to achieve the desired profile. Once installed, a coating system would then be applied. Alternatively, a wide range of decorative mouldings are available from various manufacturers. To provide added design flexibility, decorative mouldings or features can be made using QT EcoSeries Wall Panels. The panel can be cut into bands or laminate multiple layers and shape to achieve the desired profile. Once installed, a coating system would then be applied. Alternatively, a wide range of decorative mouldings are available from various manufacturers.

EcoSeries Wall Panels. The panel can be cut into bands or laminate multiple layers and shape to achieve the desired profile. Once installed, a coating system would then be applied. Alternatively, a wide range of decorative mouldings are available from various manufacturers.

EcoSeries Wall Panels can be cut into bands that can be installed around windows, doors, along horizontal control joints, etc to enrich the aesthetics of the project. They are installed so the top and bottom edge (bevelled at 15 degrees) falls away from the wall. Where bands
meet, they should be cut at a 45˚ angle, across the face of the corbel to help conceal the join and increase the adhered surface bond. Bands are bonded into place with polyurethane foam and corbel screws or nails to mechanically fix the bands until the foam is set.

Window Head Type 1

 Window Head Type  2

 Doors

Wherever possible windows and associated flashings should be installed prior to the installation of the QT EcoSeries Wall Panel. When ordering the window frame it is essential to plan where the window flange will be positioned either flush with the stud frame, flush with battens or even over the panel.

All materials that are susceptible to deterioration due to plastics migration or alkalinity of cement base products must be protected (check with product manufacturer).

Wall to Roof

Wall to roof details can often be unsightly as they are easily seen and hard to conceal without compromising the weathertighness of the dwelling. Because of its visibility, it is essential to create clean straight lines either by using a uPVC moulding or cover flashings.

Soffit & Eaves

The eaves or roof overhang play a significant role in the comfort performance of the building. Eaves or overhangs are used to shade the walls from the summer sun, while capturing the sun’s heat in the winter. Eaves will reduce glancing light, which highlights the wall surface. Glancing light is the light that is nearly parallel to the surface of the wall and casts visible shadows and uneven projections of the surface finish QT EcoSeries Wall Panels can be installed to suit various soffit designs and details.

 

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Jan 11

QT Coating System

Coating /Rendering

The proprietary coating systems consist of polymer-modified cement renders, which must be finished with an acrylic texture and paint. The proprietary coating manufacturer’s instructions and application requirements must be followed at all times. *(Available to download from the QT website) In most cases these coating systems must be applied by an approved applicator. High profile or heavy texture finishes can minimise surface imperfections or glancing light concerns. Light coloured coatings are recommended. Polymer-modified cement renders must not be applied over sealants or control joints.


Pre – Coating System Inspection

Check all internal and external corners are formed correctly and have good straight lines. Check the first horizontal course, and panels above rooflines have a good clean bottom line. Check weep holes have been installed in the first horizontal course. With a 1.8m spirit level check for variations greater than 3mm in the QT EcoSeries Wall Panels, especially where panels butt together. If variations are found, take the appropriate remedial action eg. rasp to an acceptable level, or re-fix the offending panels. It is important to eliminate large variations, as they may appear under critical or glancing light conditions. If the internal lining has not yet been installed, advise the building supervisor that internal wall lining cannot be installed using nails as the knocking vibrations will transfer through the frame and crack the render coatings (hairline cracking). Hence internal lining must be screwed. After the inspection has been completed, application of the base coat can begin.

Application of a Polymer Modified Render Base Coat.

Trowel an even coat of polymer-modified cement render over the entire QT® EcoSeries Wall Panel, embed QT® FullMesh into the wet Render, overlapping joints by 100mm minimum. Allow to firm and then screed and or float to a flat and level finish. The purpose of this coat is to even out the substrate and the porosity of the QT® EcoSeries Wall Panel. 150mm wide x 300mm long strips of QT® 45° Mesh are also required to be set into the base coat at 45° angle across the corner of all windows and door openings into wet render. Do not render or texture over control joints. The above is a generic guide only. Refer to the proprietary coating manufacturer’s instructions for a detailed description of application. Any proprietary coating system specified must meet or exceed the performance criteria of the BCA.

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Jan 11

QT Product Information

Storage and Handling

Care should be exercised in handling the QT®EcoSeries Wall Panels to avoid any damage to edges, ends and faces. Panels must be stacked flat, off the ground and supported on a level platform. Plastic Shrinkwrap applied to pallets of panels for transportation from the factory, must be removed at the destination (i.e. distributors warehouse or direct to site) to allow panel to continue drying and equalise with local humidity. The panels must be kept dry at all times by storing under cover, or providing weatherproof covers to the stack. Panels must be dry prior to fixing. Intermittent weather exposure is not detrimental to the panel. However if QT®EcoSeries Wall Panels become wet, allow thorough drying before fixing. Drying shrinkage may occur if the QT®EcoSeries Wall Panels are not allowed to dry sufficiently. The proprietary Coating System must be applied and completed within 1 month from the date of installation of the TEcoSeries Wall Panels.

QT®EcoSeries Wall Panels and cement based renders, will release their salts and/or fines if saturated; this condition is know as efflorescence. In order to prevent efflorescence the cement products must be sealed to prevent the ingress of moisture and/or installed with careful attention to the weather-tightness details to prevent the ingress of wind driven rain, gutter overflow or moisture tracking along a surface with capillary action. The water that has permeated through the panel and render will collect and dissolve any salts and/or fines that are then released through hairline cracking in the render which are caused by hydrostatic pressure build up. The dissolved salts and/or fines will crystallise on the external surface. Should efflorescence occur, it is essential that the moisture source be eliminated and any hairline cracking repaired to maintain weathertightness. Refer to coating manufacturer for suitable surface repair techniques.

Panels must always be carried on edge. Any minor damage should be repaired with joint compounds or polyurethane foam. Fixings and other accessories must be stored so that they are kept clean, dry and undamaged. All components must be used within the designated shelf life. Any damage to Clips and Channel may affect the integrity or performance of the wall system. Panel may be cut with an electric circular saw 60 pt tungsten tip blade, diamond blade or handsaw. Panels are best shaped with the use of an electric plane or a handrasping tool. Holes or services may be formed with the use of an electric fretsaw or drill. When power tools are used for cutting, grinding or forming.

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