Membryl Cool Roof

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Technical Data.


  1. Reflective properties aid in reducing internal air temperatures by up to 20oC. Aids in reduction of CO2 emissions.
  2. Energy and cost efficient.
  3. Resistant to chemical attack.
  4. Very high adhesive strengh - no primer required on most surfaces
  5. Weatherproof and lightfast.
  6. Fungal and algal resistant in high humidity environments.
  7. Excellent dirt pick up resistance.
  8. Tough - high tensile strengh and hardness.
  9. Low VOC.
Note: The above results are a product of in house testing base on current industrial standards. It should be noted there is currently no APAS regulation regarding the insulating/ heat reflective properties of roof coatings

Number of Coats: Refer Specifications

Spreading Rate Per Coat: Refer Spec

Wet Film Per Coat: Refer Spec

Recoat (@25oC): 4-6 hours

Curing time: 28 days

Colour: Range of colours

Thinner: Water

Shelf Life: 12 months

Properties Test Method Test Results
VOC ASTM D-2369 14 g/ L(Low)
Tensile Strengh ASTM D412 20N or 3.66MPa
Elongation ASTM D412 140%
Durometer Hardness ASTM D2240 Durometer "A" value 78.5
Direct Tension Adhesion Strength ASTM D4541 2.0N/mm2 or 2.0Mpa
Mandrel Bend Test AS 1580.402 ; ISO1519 Pass-no cracking, flaking orpeeling observed
Water Vapour Transmission ASTM E96 35.6g/ m2/ 24 hours
Water Permeability ASTM E96 1.47 x 10-7 g/Pasm2

Moisture Vapour Diffusion Coefficient

Moisture Vapour Diffusion Resistance Coefficient

Moisture Vapour Equivalent Air Layer Thiskness


4.3 x 10-5 cm2 sec-1



Oxygen Diffusion Coefficient

Carbon Dioxide Diffusion Coefficient

Diffusion Resistance Coefficient

Equivalent Air Layer Thickness

Equivalent Thickness of Concrete

Taywood in - house test method Section 5.4 (Gas Dispersion Test)

2.9 x 10-7 cm2 sec-1

4.9 x 10-7 cm2 sec-1




Chemical Resistance

10% W/V Sodium Hydroxide

10% W/V Nitric Acid

Taywood in - house test method (as nominated)

1 hr - temporary effect

3 hrs - temporary effect

1 hr - no visible change

3 hrs - no visible change

Fire Propagation

Surface Spread of Flame

BS.476: Part 6

BS.476: Part 7

3.3 Fire Propagation Index

Class 1

Resistance to Artificial Weathering

1000 hours

4000 hours

AS/NZ 1580.483.2


Satisfactory-no defects

Satisfactory-no defects

Biological Resistance

Fungal 1 month(accelerated)

Algal 6 month(accelerated)


Thor in - house

Accelerated Testing


Excellent Film Fungal Protection

Excellent Film Algal Protection

Application Guide.


Surface Preparation

  1. Surface should be clean, structurally sound & contaminant free. If necessary, appropriate repairs should be carried out.
  2. Exposed reinforcing bars are to be cleaned of rust prior to repair. If cementitious product are used they should be cured for a minimum of 7 days, however 28 days is preferable.
  3. Surface should be dry but reasonable dampness without visible moisture is acceptable.
  4. Remove contaminants such as grease and oil with detergent and water. Areas showing fungal or algal growth should be pressure water jetting, abrasive blasting or mechanical/ hand wire brushing.
  5. Porous(but sound)surface can be primed with thinned coat of Membryl (a mix of 2 parts of Membryl to 1 part of clean fresh water is recommended) applied by spray, roller or brush.
  6. Painted areas should be checked for soundness. Remove loose paint and prime area with CROMSEAL Bind Back.
  7. Cracks or joints displaying non-active crack wider than a hairline should first be filled with proprietary filler. All active cracks and expansion or construction joints are to be cleaned to acommodate a backing rod combined with proprietary elastomeric filler.

Application Procedure and Equipment

  1. Membryl can be applied using roller, brush or airless spray.
  2. Adhere Polyfab BB with its bond-breaker section over the treated movement rea. Fold back unadhered fabric on both sides. Apply Membryl to the surface and while it is wet embed the fabric. When dry, apply Membryl over treated sections. Allow to dry berofe the application of the membrane.
  3. Pre-Existing sealants/mastics - ingeneral Membryl can be directly applied to most mastics, however non-paintable silicones are not suitable. If it is silicone or it can not be identified, apply Polyfab BB over the area as detailed above, before treating with Membryl.
  4. Upright angles and protrusions - sharp corners formed by vertical and horizontal junctions such as parapets and pipes, etc., should be detailed in a similar fashion with Polyfab BB as detailed above.
  5. The ends of vertical membranes should be protected to avoid ingress of water behind the membrane. On parapet walls, if possible, the membrane should be carried to the top and slightly down on the other side thus totally eliminating water ingress. On high vertical walls or protrusion the horizontal membrane should be turned up approximately 200mm and applied into a reglet ( 5mm wide and 10mm cut)and / or covered with a down - turned protective flashing.
  6. Do not apply below 10oC, or when relative humidiyt is above 85% or when rain is imminent.
  7. Do not allow ponding to occur between coats or before system is fully cure (normally 7 days after application of final coat). Water should be swept off or mopped during curing period to avoid damage.

Transport and Storage.


Sizes: 20L

Weights: 27.5kg

Dangerous Goods Class: N/A

Flash Point: N/A

UN Number: N/A

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