Inspection and Preparation

INSPECTION AND PREPARATION

1.Flat Asphalt Roofs

a.Inspect all surfaces to assess soundness of existing substrates and coatings, and any test areas, to verify compatibility with the proposed coating system and to assess the need for priming.

b.Thorough inspection and adhesion testing on solar reflective (especially aluminium pigmented) coatings is absolutely essential. Remove by suitable mechanical means (eg. Floor surface grinder) if suspect, to give at least 50% asphalt exposure over the whole area.

c.Thoroughly clean down all areas to be treated, removing all loose chippings, dirt and debris, surface lying water, mould growth, moss, etc.

d.Embedded chippings should be removed by a mechanical scabbling device or other means as necessary. Ensure the roof is able to carry the weight of any equipment.

e.Treat all areas of fungal growth or moss with Torkill ‘W’ Anti-Fungal Wash to ensure all spores are destroyed. Remove all residues.

f.Any spalled, loose, unsound brickwork or concrete should be broken out and repaired using a suitable repair mortar.

gRemove all loose, suspect, flaking and friable materials, cutting back to a sound firm edge. Prepare all surfaces to a clean, dry and sound condition to promote satisfactory adhesion, if necessary removing or abrading existing coatings and test patches as required. (Where necessary, thoroughly scrub with suitably diluted Torstrip WDA10 to ‘cut’ surfaces followed by thorough vigorous rinsing to remove all residues).

h.Any asphalt blisters or rivels should be made good by gentle heating and ironing flat.

i.Any asphalt which has slumped should be gently heated and reinstated or made good with a suitable repair compound - do not overheat. Allow repairs to cure prior to coating.

j.All unsound remedial repairs should be removed and made good.

k.All large cracks and voids should be cleaned out and made good using a suitable repair compound.

l.For wet or saturated substrates careful consideration should be given to the installation of permanent roof ventilation.

m.Areas where the insulation or underlying substrate has collapsed should be cut out, repaired and reinstated to provide a good solid base for the coating system.

n.At all upstands, cut out a chase at least 150mm above the roof surface into which the re-inforced coating should be taken. Re-point on completion. (allow minimum 2 days to cure).

PRIMING

1.Torcure MC Binder/ Sealer (PU885)

1. To bare concrete, asbestos cement or other cementitious surfaces apply one coat of Torcure MC Binder/Sealer (PU885) to all prepared surfaces at an approximate coverage rate of 6m²/litre. Rough or highly porous surfaces will significantly reduce the coverage rate. Visually check that all porous surfaces are adequately sealed. Touch-in suspect areas where necessary. Allow to dry for at least 4 hours before overcoating (longer in cold conditions).

1. To de-chipped, porous or degraded felt or asphalt surfaces apply one coat of Torcure MC Binder/Sealer (PU885) to all prepared surfaces at an approximate coverage rate of 8-10m²/litre (de-chipped) to 12m2/litre (other) surfaces. Rough or highly porous surfaces will significantly reduce the coverage rate. Visually check that all porous surfaces are adequately sealed. Touch-in suspect areas where necessary. Allow to dry for at least 4 hours before overcoating (longer in cold conditions).

1. Overcoat within 48 hours. After this period it may be necessary to re-prepare the surfaces.

LOCALISED REINFORCEMENTS

1.Localised Reinforcement

(where necessary, bridge any movement or high stress areas with a debond tape eg. common masking tape, before applying materials)

a.To all side and end-laps, hairline and isolated cracks, bolt heads, joints, movement joints, stepped joints and dissimilar adjoining substrates, apply one coat of Elastaseal Embedment Coat (RC102) at an approximate coverage rate of 1-2m²/litre (not less than 0.5litre/m²) to a minimum width of 75mm. Immediately and thoroughly ‘wet-in’ Elastamat Regular glass fibre matting.

Note: uneven or irregular surfaces will significantly reduce the coverage rate. Make further material allowances where necessary

b.All upstands, detailing, protrusions, ventilation equipment supports, etc. should be coated with one coat of Elastaseal Embedment Coat (RC102) applied at an approximate rate of 1-2m²/litre (not less than 0.5litre/m²) to a minimum width/height of 150mm. Into the coated areas, immediately insert and thoroughly ‘wet-in’ Elastamat Regular glass fibre matting.

Note: uneven or irregular surfaces will significantly reduce the coverage rate. Make further material allowances where necessary.

c.Allow to dry before over-coating.

d.When embedding Elastamat into the coating material it may be necessary to tamp the mat. Use a soft nylon brush or specialist roller ensuring that there are no tented areas.

e.After completing the embedding of the reinforcement no wicks/proud fibres should be evident. Where visible these should be flattened by over-rollering with a short pile or artificial mohair-type roller whilst wet.

TOP COATS INCLUDING OVERALL REINFORCEMENT SYSTEMS

18.Elastaseal System 25

1. To all upstands, plinths, hard edges, localised repairs minor splits, protrusion details, stepped joints and any other vulnerable details apply one coat of Elastaseal™ Fibretex (RC104) at a coverage rate of 1m²/litre. Allow to dry firm before overcoating.

1. Apply one overall coat of Elastaseal Embedment Coat (RC102) to the prepared surfaces at a nominal coverage rate of 1m²/litre (see note below) and whilst wet insert Elastamat Regular glass fibre matting and thoroughly ‘wet-in’ using a short to medium pile roller. Allow to dry before applying next coat.

(Note - rough or uneven or heavily mineralised surfaces may significantly reduce coverage rate – make further material allowances where necessary).

c.Overlap adjacent reinforcement areas already laid by at least 50mm ensuring sufficient extra embedment material is applied to these areas.

d.When embedding Elastamat into Elastaseal it may be necessary to tamp the mat. Use a soft nylon brush or specialist roller ensuring that there are no tented areas.

e.Check for any upstanding glass fibre strands and cut flush with surface with a sharp knife. Overcoat cut areas. Allow to dry before applying next coat.

f.Apply one overall coat of Elastaseal Top Coat at a maximum coverage rate of 1.6m2/litre (not less than 0.63litre/m²). Allow to dry before applying next coat.

g.Apply a second coat of Elastaseal Top Coat (RC101) at a maximum coverage rate of 1.6m2/litre (not less than 0.63litre/m²).

h.It is recommended that different coloured Top Coats are applied to enable application guidance and also monitoring of weathering of the system.

i.On completion check for pinholes and misses and rectify appropriately.

j.If a walk-way, or slip-resistant finish is required, apply an extra coat of Elastaseal Top Coat (RC101) to the desired area at an approximate coverage rate of 3-4m2/litre (not less than 0.25litre/m²) and broadcast suitable anti slip media (e.g. calcined bauxite grits) into the wet coating.

Promain UK Limited Promain House Knowl Piece Business Park Hitchin SG4 0TY t.01462 421 333