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Polyurethane waterproofing membrane:


Multithane STD Polyurethane Liquid Membrane

It is a single pack, liquid applied, moisture curing, self levelling, waterproofing membrane which cures to form a seamless, tough, durable, elastomeric (class 3 ) waterproofing membrane. It bonds well to most suitably primed building substrates and is suitable for above and below ground applications. Colour: Grey. 

Uses 

It is designed to waterproof most non-exposed applications within the building and construction industry including:

Tiled or Covered Areas: Shower recess & wet areas (floors and upturns), decks, balconies, terraces, podiums, retaining walls, planters & landscaped areas, structural slabs, tanks, pits and bunding areas. 

Suitable Surfaces: 

It is suitable for most building substrates including:

Concrete, Cement, Cement Render, FC and CFC Sheeting, Render, Brick, Block, work, Plaster Board, Masonry, Bitumen (when primed with Primeseal), Metal, Timber, Particle Board and Plywood ( when primed with Primeseal).

Surfaces must be made good and should be sound, stable, dry, clean and free of dirt, dust and contaminants and suitably primed.  

Specification

The information contained in this product data sheet is typical but does not constitute a full specification as conditions and specific requirements may vary from project to project. The instructions should be considered as a minimum requirement but the applicator or contractor must use their skill, knowledge and experience to carry out additional works as may be necessary to meet the requirements of the project. Specification for specific projects should be sought from the Company in writing. 

Limitations

Not designed for applications exposed to sun light.  

Benefits and Advantages

It represents the highest standards in polyurethane waterproofing technology and provides the following benefits and advantages:

Single pack - no mixing.

Fast curing within 24 hours).

Permanently flexible (tests show flexibility > 500% - Class 3 [highest class of  sensibility ]). 
Will not stain tiles or grout - as it is tar and bitumen free.

Self levelling and seamless membrane (no joints or laps).
Suitable for immersion in water.
Can be directly tiled (broadcasting of sand in to final wet coat is recommended).
Good chemical resistance.
High strength and puncture resistant.
Easily repaired and or maintained.
Odourless (subjective) when cured.
Formulated to provide long term protection.
Easy to apply.
Has good hydrostatic resistance.
Long history of Australian use. 

Precautions in Use

Risk is considered low when properly used but precautions on can, label and / or data sheets should be observed. Use in well ventilated areas. Uncured product is flammable, so keep all sources of ignition away from product and its vapours.  

Priming and Surface Preparation

Good preparation is essential. Surfaces must be sound, stable, dry, clean and free of dust, loose, flaking, friable material and substances that may diminish adhesion.  

Priming

Surfaces should be suitably primed with Primeseal applied at no less than 1 litre per 4 m2 and allowed to dry.  Primeseal must be used for roof areas, timber and particle board surfaces, bitumen or where there is a risk of evaporation of entrapped moisture in the substrate which may cause the membrane to bubble. Alternative primers such as Multiseal may be used in non-exposed porous areas and where the moisture content of the surface is very low, applied at 3 to 4 litres per m2.  

Metal surfaces must be clean and free of contaminants and then metal etch primed. If rusted, treat to remove rust, apply a rust converter and then metal etch prime. Excessively porous, friable and dusty surfaces may require an additional priming coat. Allow primers to dry or fully cure before applying the membrane and please refer to the product data sheets of the stated primers.  

Detailing Preparation

Corners
Prime as required.

Apply an adequate flexible polyurethane sealant, in accordance the manufacture's instruction and tool off to form a solid, coved or 45 degree fillet extending at least 10mm on to the adjacent surfaces. Allow to cure. Apply membrane directly over the sealant and on the adjacent surfaces.

For Additional waterproofing protection the following additional steps should be taken
Lay a strip of Wrimco Seal Tape (self-stick, butyl mastic waterproofing membrane with a polyester backed reinforcing fabric) over the cured polyurethane sealant (as described above) pressing it firmly on the surface. Apply the membrane directly over the tape and on the adjacent surfaces.

Joins, gaps and Cracks

General
Joins, gaps and cracks should be suitably filled and sealed with an appropriate elastomeric sealant, preferably a polyurethane sealant, and allowed to cure. Recommendation: The movement of small cracks should not be underestimated and should be at least covered with a flexible polyurethane sealant or additional coats of membrane.

Large or Live Cracks

Large cracks should be routed out to form a 'V' and then filled and sealed with a polyurethane waterproof joint sealant as per the manufacturer's instructions. The sealant should be finished slightly proud of the surface and allowed to cure. After priming, as required, lay a strip of Leak-Seal Tape over the join or crack pressing it firmly on to the substrate. Membrane is then applied directly to the Wrimco Seal Tape and extending at least 75mm on to the adjacent surfaces.  

If the Wrimco Seal Tape is not used then a suitable bond breaker tape (such as duct tape) at least 48mm wide should be laid over the join or crack and apply a fully reinforced membrane consisting of a base coat of membrane in to which the reinforcing fabric is embedded, a saturating coat of membrane ensuring that the fabric is entirely saturated and covered and then allowed to cure.  At least one or two further coats are applied as per membrane's Product Data Sheet extending at least 75mm on to the adjacent surfaces.  

Joins - Particularly in CFC Sheeting and Timber Sheeting

Ideally the sides of the sheets should be fully coated with a flexible polyurethane waterproof joint sealant prior to butting the sheets together.

If not, the joins should be suitably filled and sealed with an appropriate elastomeric polyurethane waterproof sealant and finished flush with or preferably slightly proud of the surface and allowed to cure. 
After priming, as required, lay a strip of Wrimco Seal Tape over the join, pressing it firmly on to the substrate. Membrane is then applied as described under 'Large or Live Cracks'.
 

If the Wrimco Seal Tape is not used then follow the procedure as described under 'Large or Live Cracks'.  

Waste Outlets, Penetrations and Angles

Waste Outlets: Floor wastes and puddle flanges should be rebated in to the floor to allow water to readily drain. Fill all gaps and perimeters with a polyurethane joint sealant.

Plastic or metal angles: Where required by the Building Code such as internal hobs and exterior door barriers and also plastic corner angels under wall boards, they should be securely embedded in to a continuous, gap free bed of a polyurethane sealant / mastic.  

Application  

Apply Multithane Std by brush, roller, broom and squeegee in a minimum of two coats, usually a day apart so that the minimum dry film thickness in 1.2mm. Where no primer is used, an additional coat of Multithane Std is recommended. The minimum wet coat thickness per coat is 0.5mm.   

Reinforced System

In areas such as corners and over joins and cracks the membrane should be used in conjunction with a reinforcing fabric (fibreglass matting). This application consists of applying a base coat in to which the reinforcing fabric is laid followed by the application of a saturating coat ensuring that the product is worked well in to the fabric and that no wrinkles or bubbles are present and that fabric is entirely saturated and covered with product. Allow to cure. Apply one or two further coats of products.  

Coverage

The stated average coverage rate may vary depending upon type, condition, porosity, texture of the surface and application technique.  

Multithane Std: Generally, 1.5 to 1.6 litres per sq.m. for two coats combined, i.e. 0.75 to 0.80 litres per sq.m. per coat. Average 15 pail usage approximates 10m2. Ensure that the dry film thickness of the cured membrane is at least 1mm. Minimum thickness per coat is 0.5mm.

Primers: Generally 4 sq.m. per litre per coat (refer above).  

Colours

Grey. Colour may lighten after application.  

Drying and Curing

Drying and curing of the product is affected by type, dryness and porosity of the surface, temperature, humidity, ventilation, climate conditions and application technique and therefore drying and curing can only be given as a guide.  

Generally Multithane Std is weather resistant within 8 to 12 hours with full cure within 24 hours.  

Storage

Keep in cool, dry place away from heat, flame or combustible material. Product contains flammable solvents. Class 3 dangerous goods must be declared prior to transportation. Available in 5 Lt and 15 Lt pails.
Self life: 6 - 12 months in unopened container but best used within 6 months. As this is a polyurethane some skinning of the product may occur. This should be cut out and removed. Balance of the product will be suitable for use.
 

Clean Up

Avoid spills. They are difficult to clean particularly off porous surfaces. Wet spills use a cloth and Solvent. Do not clean off carpets as it is better to allow product to cure and then shave the carpet. Equipment should be immediately cleaned with Solvent.

Tiling, Topping or Top Coating

It should be covered, topped with sand: cement mix, covered with geo-textile and pebbles or tiled. If membrane is to be tiled, dry builder's sand should be liberally and fully broadcast into the last wet coat to provide a mechanical key. Allow to cure then remove any loose sand. Ensure surface is dry and clean. Two pack, flexible tile adhesives are recommended. Acrylic bonding agents can be used in sand: cement mixes for better strength and adhesion. When tiling, it is essential that adequate expansion joints are installed in accordance with good tiling practice and AS3958.1-1991.  

Safety & Precautions

It is solvent based. The use of solvent resistant gloves and goggles (against splashes) are recommended. If spraying, which is very rare, the use of self contained breathing apparatus is recommended. If swallowed do not induce vomiting, give plenty of water to drink. Seek urgent medical advice. If in eyes, flush thoroughly with clean water, holding lid open to ensure any trapped product may be flushed away. Seek medical assistance. If on skin, remove contaminated clothing and wash skin with soap and water. This may not remove the product but will encourage it to cure and can later be peeled off. If inhaled, unlikely due to viscosity of the product, remove person to fresh air and apply artificial respiration if required and seek urgent medical attention. Product is flammable when wet. Keep away from all sources of ignition. Ensure adequate ventilation. Vapours may collect in low lying areas.  

For full safety data refer to the products Material Safety Data Sheet. Observe precautions as per label.  

Tests and Technical Data

Information below is general and approximate.  It passes the criteria for AS4858:2004 Wet Area Membranes Elongation at break: >500% Class 111 High Extensibility. Resistance to Cyclic Movement: 50 cycles without rupture, tears and crazing

 

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