Decothane® Ultra

• British Board of Agrement (BBA) certified No. 14/5158
• European Technical Approval (No.ETA - 14/0331)
• External fire performance according to ENV 1187:BRoof(t1) + (t4) over Built up roofing system, classification under BS 476-3: 1958 EXT F. AB
• Olfasense– Report Number SIKA23A_01

One-component, moisture-triggered, aliphatic polyurethane

9 months from date of production

The product must be stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures >0°C and <+25°C. Higher storage temperatures may reduce shelf life of product.  Reference shall also be made to the storage recommendations within the safety data sheet.  It is recommended that the product is stored under warm conditions (20°C) prior to application at temperatures below 10°C.

~88.0 % (+23°C / 50 % r.h.)

~84.5 % (+23°C / 50 % r.h.

Reinforced Roof Waterproofing

Decothane® Ultra is applied in one coat reinforced with Sika Reemat Premium and sealed with a final top coat of Decothane® Ultra.

System Working Life ~15 Years

System Working Life ~20 Years

System Working Life ~25 Years

-30°C to +80°C (intermittent)

Strong resistance to a wide range of reagents including paraffin, petrol, fuel oil, white spirit, acid rain, detergents and moderate solutions of acids and alkalis.  Some low molecular weight alcohols can soften the material.  Contact Technical Services for specific recommendations.

Salt spray to ASTM B117 (1000 hours continuous exposure) and prohesion testing to ASTM G85-94; Annex A5 (1000 hours cyclic exposure)

+2°C min/+40°C max

20% min/85% max

Beware of condensation.  surface temperature during application and cure must be a minimum of 3°C above dew point.

+2°C min/+60°C max

Wood moisture equivalent (wme) (max): <28%

Decothane® Ultra is designed for fast drying.  High temperatures combined with high air humidity will increase the drying process. Thus, material in opened containers should be applied immediately.  In opened containers, the material will form a film within 1 hour.

~48 hours.  For longer periods ≤ 14 days, the surface must be reactivated with Sika Reactivation Primer.

Times are approximate and will be affected by changing ambient conditions particularly temperature and relative humidity.

*Be aware that heavy rain or rain showers can physically mark or damage the still liquid coating

Application at heavier than recommended thicknesses may result in a prolonged soft feeling to the coating.  This will eventually cure.

For best results apply Decothane® Ultra by brush (for details and penetrations) or roller.  Rollers should be disposable medium pile simulated sheepskin.

General

All dust, loose and friable material must be completely removed form all surfaces before application of the product and associated system products, preferably by vacuum extraction equipment.

To confirm adequate surface preparation and Decothane® Ultra adhesion, carry out a preliminary trial before application together with adhesion tests as required.

Prior to the application of Decothane® Ultra embedment coat  the substrate must be prepared and the priming coat must have cured tack-free.  For the waiting time/overcoating please refer to the technical datasheet of the appropriate primer.

Cementitious Substrates

Laitance, other loose friable material and weak concrete must be completely removed and surface defects such as blowholes and voids must be fully exposed.  In severe cases use abrasive blast cleaning, grinding or scarifying equipment to achieve a sound surface.

Repairs to the substrate, filling of joints, blowholes/voids and surface levelling must be carried out using appropriate products.

High spots must be removed e.g. by grinding.

Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in subsequently applied coatings.  The concrete must be carefully assessed for moisture content, air entrapment, and surface finish prior to any coating work.  Any requirement for priming must also be considered.  Installing the membrane either when the concrete temperature is falling or stable can reduce outgassing.  It is generally beneficial, therefore, to apply the embedment coat in the late afternoon or evening.

Brick and Stone

Thoroughly clean by power wash and allow to dry. Where there is a risk of algal re-growth on absorbent surfaces use Liquid Plastics Biowash.  Please refer to the Biowash Technical Datasheet for further information. Repair any spalling, flaking or other damage and replace any missing jointing.

Asphalt

Thoroughly clean using by power wash and allow to dry. All major cracks should be sealed to allow continuity of the Decothane System. Asphalt must be carefully assessed for moisture and/ or air entrapment, grade and surface finish prior to any coating works being carried out. Any priming requirement must also be considered.

Bituminous Felt

Thoroughly clean using by power wash and allow to dry. Existing felt surfaces that are badly cracked, degraded or where blistering has occurred, should be locally removed back to a sound, straight cut, well adhered edge and replaced with Carrier Membrane S-Vap.

Single Ply

The Single Ply should be prepared in accordance with the Specification provided for the individual project.

Bituminous Coatings

Remove loose, degraded, tacky or mobile coatings. Apply the Decothane System directly.

Metals

Steelwork is ideally prepared to Sa2½ (Swedish Standard SIS 05: 5900 = 2nd quality BS4232 = S.S.P.C. grade SP10) OR as indicated by the blasting specification which may be of a higher standard.  Where blasting to Sa2½ (Swedish Standard SIS 05: 5900 = 2nd quality BS4232 = S.S.P.C. grade SP10) is not permitted alternative blast media or clean metal preparation by pin hammer, etc. is acceptable.  Less effective methods of preparation that leave corrosion in-situ may reduce expected life term.

Dull galvanised surfaces can usually be treated with Sika Metal Primer directly following adhesion test. Bright or new galvanised surfaces may require mordant solution.

Non-ferrous metals are prepared as follows.  Remove any deposits of dust and oxidation and abrade to bright metal.  Wire brushing can be used for soft metal such as lead.  The surface must be clean and free from grease which, if present, must be removed with a proprietary solution.  Wash with detergent, rinse thoroughly and dry.

Timber Substrates

Timber and timber based panel roof decks require a complete layer of Carrier Membrane prior to the application of the chosen system.  The substrate should then be treated as a felt roof.  Small timber protrusions may be treated directly, provided that the timber is of exterior quality, e.g. marine plywood, (see Substrate Priming for further information).

Paints/Coatings

Remove loose or degraded coatings returning to a firm, feathered firm edge. Remaining coatings are only be overcoated if soundly adhered. Ensure the surface is clean and free from grease.

Existing Decothane Systems

Clean the membrane using a water jet at approximately 14N/mm2 (2000 p.s.i) using detergent and rinse thoroughly. Thoroughly clean by power wash and allow to dry.

Note: For the Waiting Time/Overcoating please refer to the technical datasheet of the appropriate cleaner. Other substrates must be tested for their compatibility. If in doubt, apply a test area first.

Decothane® Ultra is supplied ready for use and mixing is not required, however, if the product is settled or separated on opening, stir Decothane® Ultra gently but thoroughly in order to achieve a uniform colour.

Prior to the application of Decothane® Ultra the priming coat, if used, must have cured tack-free.  For the Waiting Time/Overcoating, please refer to the PDS of the appropriate primer.

Damageable areas (handrails etc) have to be protected with tape or plastic wrapping.

Please note, always begin with details prior to the installation of the horizontal surface.

1. Apply embedment coat of Decothane® Ultra.  Work only so far in advance that the material stays liquid.
2. Roll in the Sika Reemat.  Overlap the Reemat a minimum 50mm and ensure overlaps are sufficiently wet to bond both layers.
3. The rolller may require only a little extra material to keep wetted but no further siginficant material needs to be added at this stage.
4. After the coat is dry enough to walk on, seal the roof area with further coats of Decothane® Ultra dependant of the specified system.

Clean all tools and application equipment with proprietary cleaning solvent immediately after use.  Hardened and/or cured material can only be removed mechanically.