Standard Specification for the Application of Chevaline Covertexx Texture Coating System

Standard specification for the application of Chevaline Covertexx texture coating system to Hardiflex and Harditex cellulose-cement cladding

Page:1 of 4 Ref: P2041

1.0 PREAMBLE:

This specification is for the application of a Chevaline Covertexx Textured Coating System in three or four coats to exterior/interior building surfaces specifically incorporating Harditex or Hardiflex cellulose- cement cladding. Allowance is made for varying topcoats depending upon surface requirements and re-coat cycle.

2.0 CLADDING INSTALLATION

2.1 Hardiflex Sheet Cladding:

Hardiflex Sheet Cladding shall be installed in strict accordance with the recommendations and instructions contained in the Hardies Publication "Exterior Wall Claddings" March 1989, incorporating close butt joints, flexible sealant joints or open joints as appropriate. PVC Hardie Jointers may be used under certain provisos. Care shall be taken to ensure that nailing patterns are maintained, and that sheet edges are not damaged during installation.

Care shall be taken to ensure that all framing members are true and straight in both horizontal and vertical planes. Where sheets are to be continued over stud/frame junctions particularly between floors, care shall be taken to ensure that the horizontal and vertical planes are maintained true across the junction.

2.2 Harditex Sheet Cladding:

Harditex Sheet Cladding shall be installed strictly in accordance with details and instructions contained in the Hardies Publication "Harditex Exterior Cladding System" Care shall be taken to ensure that nailing patterns are maintained, and that sheet edges are not damaged during installation.

Care shall be taken to ensure that all framing members are true and straight in both horizontal and vertical planes. Where sheets are to be continued over stud/frame junctions particularly between floors, care shall be taken to ensure that the horizontal and vertical planes are maintained true across the junction.

2.3 Backer Strips:

Backer Strips shall be as detailed in the Hardies Publications and correctly installed at the time of sheet fixing. Page 2 of 4 Ref: P2041

3.0 SURFACE PREPARATION AND PRETREATMENT:

3.1 General - Responsibility: Unless expressly agreed otherwise at time of contract pricing, all work in this section shall be the responsibility of the Main Contractor, whether carried out by his own staff, other sub- trades or the Specialist Finishes Sub-Contractor. In the latter case, such preparatory work shall be priced separately from work defined in Sections 4.0 - 5.0 inclusive.

3.2 Sealant Beads: All sealant beads associated with the cladding system shall be of Tremco Dymeric, Tremco Mono 555, or Silaflex MS. In all cases the sealant beads shall be correctly installed and allowed to cure at least five days prior to commencement of coating application.

3.3 Nailing: The Contractor shall ensure that all nail fixings are driven flush with the surface.

3.4 Surface Cleaning: The Contractor shall ensure that all detritus and dust is removed from sheet surfaces prior to handing over to the Specialist Finishes Sub-Contractor.

3.5 Back-Priming: It is possible that under certain circumstances, back-priming of sheets may be required particularly where it is anticipated heavy condensation or other water can be present on the reverse face of the sheet. In such cases the Contractor shall be responsible for back- priming of sheets prior to their installation. Such back-priming should be carried out with one coat of an approved acrylic or polyurethane seal-coat.

3.6 General: The Specialist Finishes Sub-contractor shall assure himself that the surfaces to be coated are dry and free of contamination before he commences work in any area. He shall also ensure that the cladding surfaces are true and in plane, to his satisfaction. Commencement of coating work on any area shall indicate his acceptance of that surface as satisfactory.

4.0 COATING APPLICATION:

4.1 General: The system shall be applied in three or four coats as set out below, over appropriately treated sheet joints. The system is a spray applied finish, and therefore appropriate masking must be carried out prior to commencement of spray application.

4.2 Primer: All surfaces shall be primed with one coat of Coverall 50/50 Primer applied at approximately 9-10 sqm/litre and allowed to dry.

4.3 Joint Treatment: All joints in Harditex and Hardiflex Sheets which are to present a flush-jointed appearance shall be jointed with the appropriate Superfil-2 or Superfil/Superflexx Systems strictly in accordance with the instructions of Equus Industries Ltd., set out in Application Procedure A103 rev. At the same time all nail fixings and imperfections shall be flushed out with the Troweltexx Fine flushing coat and the surface allowed to dry at least 24 hours prior to commencement of coating application.

of 4 Ref: P2041

4.4 Chevaline Covertexx Texture Coat: All surfaces including Sealant Joints and/or Hardie Jointers as appropriate shall be sprayed with Chevaline Covertexx applied by Hopper Gun or Air Assisted Pressure Feed Texture Gun.

The spreading rate achieved will depend upon client requirements as to Texture Finish but will generally be in the range of 18-30 sqm/20 litre pail (.9 - 1.5 sqm/litre). Application shall generally be by way of an even ground coat followed by an appropriate Texture Coat to match a previously approved sample. The sprayed Texture Coat shall dry overnight before topcoating.

4.5 Topcoats: All surfaces to be coated shall receive either:

1. (for eggshell finish) One (1) double pass spray coat of Chevaline Coverall applied at approximately 4 sqm/litre.

or 2. (semi gloss or gloss finish) Two (2) coats of Chevaline Colourglaze applied by roller or spray at a spreading rate of approximately 10 sqm/litre per coat.

Note: The spreading rate of the topcoats will depend upon the texture profile achieved. For heavy textured profiles it is recommended that the topcoat system comprise one coat of Coverall plus one coat of Colourglaze Satin both applied by spray.

5.0 GENERAL NOTES:

5.1 Gloss: The finish shall be eggshell, semi-gloss or gloss as directed by the client/specifier.

5.2 Colour: For any area the colour of the two final coats shall be the same. It is permissible for the Texture Coat to be a shade lighter than the topcoats, but in the same tonality.

5.3 Approval: Specialist Finishes Sub-contractor shall obtain approval from the client/specifier or his representative before cleaning up and stripping off masking in any area.

6.0 WARRANTY AND MAINTENANCE:

6.1 Maintenance: This 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 Colourglaze. Where major colour change is involved the Manufacturer should be consulted for a specific recommendation.

of 4 Ref: P2041

6.2 Warranty: A warranty may be issued as to the film integrity of the Chevaline Covertexx System for a period of up to but not exceeding ten (10 years, provided that:

(a) All work is carried out by the Approved Equus Contractor.

(b) All work is done in accordance with this specification, and any amendments or alterations thereto issued by the Manufacturer.

Such a warranty is issued by the Approved Equus Contractor carrying out the work and is backed by the Manufacturer as to the fitness for use of the materials supplied for the work.

7.0 RECOMMENDED SHORT-FORM SPECIFICATION CLAUSES FOR SCHEDULE PURPOSES:

7.1 General:

This Schedule must be read in conjunction with the Specification section dealing with Specialist Finishes. Attention is drawn in particular to the delineation of responsibility for, and standard of surface preparation and pretreatment required for the exterior/interior finishes listed in this Schedule.

7.2 Chevaline Covertexx Textured Coating System for Cellulose-Cement Cladding:

The Texture Finish to nominated areas shall be a 3/4 coat Chevaline Covertexx System to match a previously approved texture and appearance. Application shall at all times be in accordance with Equus Specification P2041 and Procedure A103(rev) and any further manufacturers instructions.

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