Triskell® Asbestos Treatment

Developed over 30 years ago by a specialist team of cement chemists. the Triskell® Coatings were designed specifically to renovate and weatherproof aging asbestos fibre reinforced cement roof sheets. The Triskell® treatment is an in depth system that envolves the thorough preparation and over hauling of the roof followed by the application of the Triskell® coating, to provide a guaranteed roof coating which can be either the natural colour of the roof sheet or an attractive pigmented finish to give the appearance of a re­sheeted roof.

It was established during long term weathering tests that were carried out between 1934 and 1945, as to which asbestos cement type sheets, once weathered. can absorb up to 30% of their original weight of rainwater.

The absorption of the rainwater naturally leads to a decrease in weatherproofing properties and an increase in moss and fungal growth, which further exacerbrates the problems caused by the additional weight of the roof sheet. In addition the extended drying time of sheets can lead to damage by frost, causing cracking and delamination of the sheet surface.

The thorough preparation, repair, overhauling of fixings followed by the application of the Triskell® treatment. will provide a guaranteed extension of the lite for this type of roof.

Available in a range of colours the Triskell® treatment will improve the external appearance of the roof, which will achieve an aesthtically pleasing finish. Triskell® Coatings penetrate and bond with the sheet to seal the surface and improve water run off, retarding future moss and fungal growth. Vertical asbestos cement cladding can also be renovated with the Triskell Coating System.

Description
Triskell® is a non-convertible paint system specifically designed for the renovation of asbestos cement sheets. Applied to a properly prepared substrate the system will give a smooth long lasting moisture permeable finish thereby allowing the substrate to breathe. preventing premature failure of the surface coating.

Triskell® Steel is a cost effective and long lasting two-coat system designed specifically for the renovation of PVC / plastisol coated galvanised sheeting and cladding. Offered in a range of standard colours, but with a mixing service to meet exact specifications available on demand, this proven product quickly restores peeling galvanised sheeting to its former glory.

Specification

The use of approved contractors ensures that the work carried out is to Triskell requirements. They have developed the policies and procedures to meet the following standards, required before any work is carried out.

  • Health & Safety legislation and guidance
  • Preparation of method statements and risk assessments.
  • COSHH preparation and procedures.
  • Site safety and safe working practice.
  • Project management and quality control.
  • Cleaning and preparation of existing sheets, using high-pressure cold water rotary cleaning head in an enclosed box mounted on wheels to traverse the roof in a vertical direction.
  • Proper filtering and disposal of waste to a licenced waste site is a legal requirement.
  • Repair and replacement (if required) of damaged or leaking sheets and fixing bolts.
  • Application of Triskell treatment, by coating brush or airless spay.

Renovation Of Asbestos Cement Sheets

Triskell Treatment Specification

The quality of the preparation is crucial to the life expectancy of the system. The preparation should only be carried out by a Triskell® approved, competent contractor who has an intimate knowledge of both working with and working on asbestos cement roofs.

  • The cleaning of the roof must be carried out using high-pressure water with a closed box cleaning system.
  • A filtration system must be installed to prevent air rising entering the drainage system. Contaminated filter bags must be disposed of at a toxic waste site.
  • Badly damaged sheets or missing fittings should be replaced prior to the cleaning being carried out
  • Holes, splits and cracks must be repaired using the Triskell Flexible Repair Kit. Self-adhered bitumen based repairs are not acceptable.
  • The Triskell® Flexible Repair system repairs must be carried out to a thoroughly dampened sheet.
  • Under no circumstances should the reinforcing fabric be omitted from the system.

Application of the Triskell® System

The sheets must be clean, all repairs carried out and the sheets thoroughly DRY.

Natural System

Apply one full coat of Triskell Natural applied at approximately 4m2 per litre to achieve 40 micron OFT Allow 6 hours to cure.
Apply second full coat of Triskell Natural applied at approximately 6m2 per litre to achieve 30 micron OFT

Plastisol coated sheets, which have gained popularity over the last 25 years, have been known to suffer from both tail end and general corrosion caused by mechanic damage, in as little as eight years from the date of installation.

The premature failure of these sheets is becoming an increasingly common problem for building owners, maintenance specifiers and building occupants who under the terms of the lease have a duty to maintain the building in good order.

The delamation of the plastisol coating is not only unsightly but leaves the microscopic layer o! galvanised coating un-protected. Once the galvanised coating is breached, corrosion will quickly follow, which could lead to costly bespoke manufacturing of replacement sheets.

All too frequently, attempts to overcome this problem using unsuitable alkyd gloss type paint systems meet with failure, resulting in continuing unsightly cladding finishes and a high cost to ratify the mistalke. Chemplas Triskell®, who pioneered the renovation of asbestos cement roofs over 30 years ago l1as, after extensive research and material testing, developed Trislkel Steel®, a coating system designed to renovate plastisol coated sheeting and cladding quickly and economically.

The system involves removing defective and dis­coloured coating using a combination of mechanical and high pressure cleaning methods prior to the application of the two-coat Triskell® Steel system.

Designed specifically for the renovation of defective plastisol coated roof and wall sheeting. Triskell® Steel has excellent slump resistance that allows high DFTs on vertical sheeting. The system is extremely durable with good colour stability and is guaranteed for 10 years, with a life expectancy in excess of 15 years.

Triskell Steel® is available in a range of attractive colours enabling the building to be restored to its original colour whilst extending the specifiers options by achieving maximum visual impact through a co-ordinated colour scheme.

Designed specifically for the renovation of defective plastic coated roof and wall sheeting, Triskell® Steel has excellent slump resistance which allows high DFTs on vertical sheeting. The system is extremely durable with good colour stability.

  • Exceptional long life
  • Can be applied with substrate temperature down to 5°C
  • Will not support mould growth
  • Attractive range of colourswith special colours by arrangement
  • Patch prime corroded areas with OD primer
  • One full coat of Triskell® Steel Intermediate
  • One full coat of Triskell® Steel Finish

5 litres

 

Loose and defective coatings must be removed by mechanical means. Corroded areas will require hand preparation to ST 2. Large areas of corrosion can be prepared with an angle grinder fitted with a wire cup brush.

 

  • The system must not be applied to a substrate with a temperature below 5°C.
  • Triskell® Steel Finish can be marked if precipitation occurs within three hours of application.

Renovation of Defective Metal Sheeting & Cladding Triskell® Steel Specification

For sound surfaces free from corrosion, the specification is as follows:
NOTE: Refer to office before over coating plastisol coated sheets that are less than 12 months old

  • Thoroughly cleaning sound plastisol coatings by detergent pressure water washing to remove dirt and chalking deposits from the surface.
  • Clean degreased dry sound plastisol surfaces. Apply a first full coat of Triskell Steel at 6 sq m litre to achieve 50 microns.
  • Apply one full coat of Triskell Steel Finish at approximately 8 m2 per litre to achieve 50 microns DFT.
  • Clean degreased dry sound plstisol surfaces. Apply apply a first  full coat of Triskell Steel at 6 sq m litre to achieve 75 microns.
  • Apply a second full coat of Triskell Steel at 8 sq m litre to achieve 50 microns.

For surfaces where there is degradation of the plastisol coating, and the underlying sheeting is structurally sound but slightly rusting prepare and coat as follows:

  • Thoroughly cleaning sound plastisol coatings using detergent high pressure water washing to remove dirt and chalking deposits from theplastisol.
  • After cleaning surfaces, abrade any degraded qnd rusting surfaces to remove loose oxide deposits and rust. Abrade the surrounding plastisol coating at least 25mm into the sound plastisol coating using either wire brushes or angle grinders fitted with a wire cup brush.
  • Apply as a patch coat to all prepared surfaces, lapping onto the abraded surfaces of the existing sound plastisol, one coat of Triskell Steel QD Primer applied at 4 m2 per litre to achieve 75 microns DFT. Allow 6 hours to cure.
  • Apply one full coat of Triskell Steel Intermediate at approximately 4 m2 per litre to achieve 75 microns DFT. Allow 12 hours to cure.
  • Apply one full coat of Triskell Steel Finish at approximately 8 m2 per litre to achieve 50 microns DFT.

Note: – Cladding / sheet substrates other than plastisol coated steel sheet will require additional preparation and primers.

Please contact the office for further advice.