Standard specification for the application of THERMEXX insulated
cladding sponge finish on light timber frame construction
Page 1 of 5
Ref: P7015
1.0PREAMBLE:
This specification is for the application of the EQUUS THERMEXX insulated cladding system to light
timber frame construction as generally found in domestic and light commercial construction.
The standard system is supplied as a sponge-finish system, with CHEVALINE COVERALL applied as the coloured weathercoat, before any masking is removed.
2.0SURFACE PREPARATION AND DETAILING:
2.1Responsibility:
All work in this section shall be the responsibility of the Main Contractor, unless otherwise expressly agreed.
2.2Materials of Construction:
.1Timber Frame:
Shall be constructed to comply with NZS 3604 with maximum 600 mm stud spacing and one set of dwangs/nogs per storey height. All framing shall be true in vertical and horizontal planes with particular attention to intersections of top plate/floor beams/bottom plate in multi-storey construction.
.2Building Paper - for walls lined internally with 9 mm Gibraltar Board:
All wall exterior surfaces shall be covered with a SANZ-approved fire retardant building paper, securely fastened.
2.3Detailing:
.1Joinery - Face Fixed:
All joinery shall be detailed and fitted to allow 43-45mm between framing and joinery at jambs and sills to allow for placing of the insulated cladding and subsequent sealing.
Final fixing of the joinery can if required be left until the cladding has been installed, but must be done before final sealant beads are placed. Head flashings should be dimensioned appropriately and fixed prior to installation of the cladding.
.2Joinery - Recessed:
Such joinery shall be fixed prior to cladding installation with allowance for installation of a sealant bead between cladding and joinery as a final moisture seal Generally joinery shall be fixed against an Inseal or similar compressed foam strip as a secondary air/moisture seal. Equus Window Flashings shall be used as appropriate.
Page 2 of 5
Ref. P7015
.3Soffits:
Shall be fixed before cladding is installed, with a finishing bead of sealant allowed after cladding work is completed.
.4Penetrations:
Penetrations such as waste pipes and fixing brackets shall be adequately flashed prior to cladding installation.
3.0SURFACE PRETREATMENT - EPS INSTALLATION:
3.1Responsibility:
All work in this section shall be the responsibility of the THERMEXX installer, unless otherwise expressly agreed. If the EPS is fixed by others, the THERMEXX installer shall satisfy himself as to the correctness of the fixing before proceeding with any coating/sealing work.
3.2Materials:
.1Expanded Polystyrene Sheet:
Shall be 40 mm thick "H" grade self-extinguishing sheet manufactured to AS 1366 Pt 3 - 1982 by Bondor (N.Z.) Ltd.
Sheets shall be stress relieved in plant or by fillet stacking on-site prior to fixing.
Other thicknesses of EPS sheet may be used for THERMEXX Cladding depending on the architectural detailing required, providing design code R-values are maintained.
.2Fixing Nails:
Shall be 75 mm spring head nails, unless sheet of greater than 50 mm thickness is used, in which case refer to EQUUS for specific fixing information.
.3Flashings/Corner Beads:
Shall be Equus pre-made flashings and corner beads.
.4Sealant:
Shall be TremcoTremflex 25 or Tremco Ezyseal.
3.3Installation:
.1Fixing:
Sheets shall be trued from the base, using a temporary or permanent 40 x 40 timber batten as a starter, or Equus THERMEXX channels
Sheets shall generally be fixed with spring nails at 300 mm centres.
Sheet joints shall always occur over a framing member.
When edge-fixing, nails in adjacent sheets shall be staggered.
Nails shall be carefully driven home 3-4 mm compressing the sheet.
Page 3 of 5
Ref. P7015
.2Detailing:
Where necessary, sheet edges shall be prewrapped with THERMEXXBINDER/THERMEXXGLASS prior to fixing. This applies particularly with installation against flashings and for some recessed joinery. Alternatively, Equus Corner Beads shall be installed on corners and edges.
External changes of direction shall be made only with factory-cut sheet edges on both faces and with sheets butt-jointed.
Where angles other than 90o at sheet edges are required, these shall be either factory pre-cut or site-cut using a jig to give uniformity.
.3 Flashings:
All associated window flashings, Head, Sill and Side, shall be correctly installed.
.4Stopping:
All nail holes and surface defects shall be stopped flush using a THERMEXX BINDER mix as detailed in THERMEXX installation instructions, before the THERMEXX skin is installed.
4.0THERMEXX INSTALLATION AND SEALING:
4.1Responsibility:
All work in this section shall be the responsibility of the THERMEXX Installer up to and including provision of external sealant beads and weatherproof coating system.
4.2Materials:
.1Thermexx Binder, Thermexx Premix and ThermexxGlass are supplied by Equus
Industries Ltd. Unless otherwise specifically directed ThermexxHeavy Glass shall be used.
.2Fine Plaster Sand:
Shall be used for stopping and mortar mixes as detailed in THERMEXX Application
Procedures and shall be sourced only from Equus IndustriesLimited or a supplier approved by them.
4.3Installation:
.1General:
Installation shall be carried out in two stages i.e. THERMEXX Skin and THERMEXXSponge Finish. Adequate protection of all adjacent surfaces shall be allowed, particularly for spray application of Sponge Finish and subsequent sealing.
Page 4 of 5
Ref. P7015
.2THERMEXX Skin:
All surfaces shall be sealed off by application of THERMEXXMortar into which is embedded THERMEXXGLASS, finished by trowel to an even finish, with all glass-fibre scrim
reinforcement lapped 30-40 mm. Spreading rates, application and detailing shall be strictly in accordance with procedures laid down in Procedure A133 and any subsequent instructions issued by Equus Industries Limited.
In all cases the THERMEXX skin shall be carried over all corner angles and base or window trim installed as part of the THERMEXX system.
Finished surfaces shall be allowed to dry overnight before application of the texture coat.
4.3THERMEXXSponge Finish:
All surfaces shall be textured by hopper gun application of THERMEXX Mortar followed by
troweling to a sponge finish using spreading rates and application techniques set out in Procedure A133 and any subsequent instructions issued by Equus Industries Limited. Unless otherwise
stipulated the texture shall be a smooth or slightly 'turned' sponge finish to match a previously
supplied sample.
4.4Sealant Installation:
All junctions between joinery and THERMEXX Cladding and around penetrations, flashings and similar details shall be sealed with TREMCO ACRATHANE supplied by Equus.
4.5Weatherproof Coating:
All THERMEXX sealed surfaces shall be sealed using a COVERALL 50/50 Primer andminimum of two (2) coats of a high build weatherproof coating applied by roller or sprayed at 4.5-5.0 sqm/litre/coat.
The coating shall be either:
CHEVALINE COVERALL - for a satin/eggshell finish or
CHEVALINE EXTRACOVER - for a semi gloss finish.
Application shall be in accordance with the instructions contained in the appropriate CHEVALINE Know How including use of a COVERALL 50/50 pre-sealer where appropriate.
5.0GENERAL NOTES:
5.1Colour:
Generally, the THERMEXX Mortar finish is grey, reflecting the cement base nature of the material. Colour is generally introduced in the Weatherproof Coating, and the colour required shall be nominated by the Specifier. For coloured THERMEXX Mortar Systems, refer to Specification P7017.
5.2Approval:
Approval for work done shall be obtained from the Specifier or Client before protective masking is removed.
Page 5 of 5
Ref:P7015
6.0MAINTENANCE:
The coating system may be cleaned at any time by low-medium pressure washing with a weak (0.1%) solution of neutral detergent. When recoating is required, either to maintain long-term film integrity or for colour change, this may be either carried out using one or two coats of CHEVALINE COVERALL, EXTRACOVER or COLOURGLAZE. Where major colour change is involved the Manufacturer should be consulted for a specific recommendation.
Physical damage is readily repaired using THERMEXX Mortar/THERMEXX Glass as required, and recoating.
7.0WARRANTY:
The EQUUS THERMEXXCladding/CHEVALINE coating system described in this specification maybe warranted as weatherproof for a period of up to 10 (ten) years, from the date application is completed.
Such a warranty is issued by the Approved Equus Contractor carrying out the work, and is backed by the Manufacturer as to the suitability for use of the material supplied, provided that:
(a)All specified work is carried out by the Approved Equus Contractor.
(b)All work is carried out in accordance with this Specification or any written amendments thereto
issued by the Manufacturer.
(c)Special conditions may be applied where service conditions involve either severe mechanical
abrasion/impact or chemical spillage or both.
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