SYSTEM DATA SHEETSikaRoof® MTC-18HIGH PERFORMANCE, UV-STABLE LIQUID APPLIED POLYURETHANE ROOFWATERPROOFING SYSTEM

DESCRIPTIONSikaRoof® MTC-18 is a cold-applied, seamless, highlyelastic and UV-stable moisture triggered polyurethaneroof waterproofing system consisting of Sikalastic®-601 BC, Sika® Reemat Premium and Sikalastic®-621 TC.

USESSikaRoof® MTC-18 may only be used by experiencedprofessionals.SikaRoof® MTC-18 can be used as following:

Roof waterproofing solution for new constructionand refurbishment projects

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For roofs displaying complex detail areas and geo-metry, even when accessibility is limited

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For cost efficient life cycle extension of failing roofsIn combination with Sikalastic®-621 TC – SR (trafficwhite RAL 9016) for cool roofs and solar roofs

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CHARACTERISTICS / ADVANTAGESProven technology - over 25 year track record▪One component – no mixing, easy and ready to use▪UV resistant - Highly reflective (RAL9016) and resist-ant to yellowing

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Cold applied - requires no heat or flame▪Seamless roof waterproofing membrane▪Compatible with Sika® Reemat Premium - easy to de-tail

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Fast curing - free from resin damage almost immedi-ately on application

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High elastic and crack-bridging - retains flexibilityeven at low temperatures

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High root resistance▪Easily re-coated when needed - no stripping required▪Good adhesion to most substrates- see primer chart▪Vapour permeable - allows substrate to breathe▪Strong resistance to common atmospheric chemicals▪

APPROVALS / STANDARDSLiquid applied roof waterproofing kit according toETAG 005, ETA-09/0139 issued by technical assess-ment body British Board of Agrément (BBA), Declara-tion of Performance 15813688, provided with the CEmarking

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External fire performance: BRoof(t1), BRoof(t2),BRoof(t3)

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Reaction to fire according to EN 13501-1: Euroclass E▪

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SYSTEM INFORMATIONSystem Structure Sikalastic®-601 BC applied in 1 coat, reinforced with Sika® Reemat Premi-

um and sealed with 1 coat Sikalastic®-621 TC

Layer Product Consumption1. Primer please refer to sub-

strate pre-treatmentplease refer to PDS ofthe Primer

2. Base coat Sikalastic®-601 BC ≥ 1.0 l/m2 (≥ 1.4 kg/m2)3. Reinforcement Sika® Reemat Premium -4. Top coat Sikalastic®-621 TC ≥ 1.1 l/m2 (≥ 1.6 kg/m2)

Note: These figures are theoretical and do not include for any additionalmaterial required due to surface porosity, surface profile, variations in leveland wastage.

Composition Moisture-triggered aliphatic polyurethane

Colour Sikalastic®-601 BC: Oxide red (RAL 3011)Sikalastic®-621 TC: Slate grey (RAL 7015), other colours available upon re-quest

Dry film thickness ~1.8 mm

TECHNICAL INFORMATIONTensile Strength ~12.1 N/mm2 (EN ISO 527-3)

Elongation at Break ~58 % (EN ISO 527-3)

Tear Strength ~47 N/mm2 (EN ISO 6383-1:2004)

Permeability to Water Vapour μ: ~3 600 (EN ISO 1931 Method B)

Water Vapour Transimission ~5.8 g/m2/day (EN ISO 1931 Method B)

External Fire Performance BRoof (t1), BRoof (t2), BRoof (t3) (EN 13501-5)

Reaction to Fire Euroclass E (EN 13501-1)

Chemical Resistance Salt spray 1000 hourscontinuous exposure

(ASTM B117)

Prohesion testing 1000 hourscyclic exposure

(ASTM G85-94:Annex A5)

Strong resistance to a wide range of reagents including paraffin, petrol, fueloil, white spirit, acid rain, detergents and moderate solutions of acids andalkalis. Some low molecular weight alcohols can soften the material. Con-tact Sika technical service for specific information.

Solar Reflectance Index ≥ 109* (ASTM 1980)* All values refer to the initial (properly cured, non-weathered) status of Sikalastic®-621 TC white (RAL9016).

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Service Temperature –30 °C min. / +80 °C max.

APPLICATION INFORMATIONAmbient Air Temperature +5 °C min. / +35 °C max.

Relative Air Humidity 5 % r.h. min. / 85 % r.h. max.

Substrate Temperature +5 °C min. / +60 °C max.≥3 °C above dew point

Substrate Moisture Content ≤4 % pbw moisture content.Test method: Sika®-Tramex meterNo rising moisture according to ASTM (Polyethylene-sheet).

Substrate Pre-Treatment Substrate PrimerCementitious substrates Sika® Concrete Primer or

Sika® Bonding PrimerBrick & Stone Sika® Concrete Primer or

Sika® Bonding PrimerCeramic tiles (unglazed), and con-crete slabs

Sika® Concrete Primer orSika® Bonding Primer

Bituminous felt & coating Normally not requiredSikalastic® Metal Primer*

MetalsFerrous or galvanised metals, lead,copper, aluminium, brass or stain-less steel

Sikalastic® Metal Primer

Wooden substrates Timber based roof decks require acomplete layer of Sikalastic® Carri-er.For small exposed timber sections: Sika® Concrete Primer orSika® Bonding Primer

Paints & Coatings Subject to adhesion and compatibil-ity tests

Existing Sikalastic® MTC System Sika® Reactivation PrimerSingle ply membranes Consult Sika Technical Department *Sikalastic® Metal Primer prevents migration of bituminous volatiles and improves long-term reflectivity.For the consumption rates and waiting time / overcoating you please referto the PDS of the appropriate cleaner and primer. Other substrates must betested for their compatibility. If in doubt, apply a test area first.

Waiting Time / Overcoating Ambient conditions Minimum waiting time+5 °C / 50 % r.h. 18 hours+10 °C / 50 % r.h. 8 hours+20 °C / 50 % r.h. 6 hours

After four days the surface must be cleaned and primed with Sika® Reactiv-ation Primer before continuing.Note: Times are approximate and will be affected by changing ambientconditions particularly temperature and relative humidity.

Applied Product Ready for Use Ambient condi-tions

Rain resistance Touch dry Full cure

+5 °C / 50 % r.h. 10 minutes* 8–12 hours 16–24 hours+10 °C / 50 % r.h. 10 minutes* 4 hours 8–12 hours+20 °C / 50 % r.h. 10 minutes* 3 hours 6–8 hours* Be aware that impact of heavy rain or rain showers can physically damage the still liquid membrane.Note: Times are approximate and will be affected by changing ambientconditions particularly temperature and relative humidity.

PRODUCT INFORMATIONPackaging Please refer to individual Product Data Sheet

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Shelf Life Please refer to individual Product Data Sheet

Storage Conditions Please refer to individual Product Data Sheet

APPLICATION INSTRUCTIONSSUBSTRATE PREPARATION

The surface must be sound, of sufficient strength,clean, dry and free of dirt, oil, grease and other con-tamination. Depending on the material the substratemust be primed or mechanically cleaned. Grindingmay be necessary to level the surface. Suitable sub-strates are such as: concrete, bituminous felts andcoatings, metal, brickwork, asbestos cement, ceramictiles, wooden substrates.For detailed information regarding substrate prepara-tion and primer chart please refer to Method State-ment No. 850 94 01.

MIXING

Mixing is not required, however if the product issettled or separated on opening, stir gently but thor-oughly in order to achieve a uniform colour. Stirringgently will minimise air entrainment.

APPLICATION

Prior to the application of SikaRoof® MTC-18 the prim-ing coat if used must have cured tack-free. For theWaiting Time / Overcoating please refer to the PDS ofthe appropriate primer. Damageable areas (handrailsetc). have to be protected with tape or plastic wrap-ping.Please note, always begin with details prior to the in-stallation of the horizontal surface.

Apply first coat of Sikalastic®-601 BC. Work only sofar in advance that the material stays liquid

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Roll in the Sikalastic® Reemat. Overlap the Reemat aminimum 5 cm and ensure overlaps are sufficientlywet to bond both layers. The roller may require onlya little extra material to keep wetted but no furthersignificant material needs to be added at this stage.

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After the coat is dry enough to walk on, seal the roofarea with one coat of Sikalastic®-621 TC.

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CLEANING OF TOOLS

Clean all tools and application equipment with Thin-ner S immediately after use. Hardened and/or curedmaterial can only be removed mechanically.

FURTHER DOCUMENTSFor detailed information regarding substrate prepara-tion, primer chart and application methodof SikaRoof® MTC-18 refer to Method Statement No.850 94 01.

LIMITATIONSDo not apply SikaRoof® MTC on substrates with risingmoisture.

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SikaRoof® MTC is not suitable for permanent waterimmersion.

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On substrates likely to exhibit outgassing, apply dur-ing falling ambient and substrate temperature. If ap-plied during rising temperatures “pin holing” may oc-cur from rising air.

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Do not dilute Sikalastic®-601 BC & Sikalastic®-621 TCwith any solvent.

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Do not use SikaRoof® MTC for indoor applications.▪Do not apply close to the air intake vent of a runningair conditioning unit.

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Do not apply SikaRoof® MTC directly on insulationboards. Instead use Sikalastic® Carrier between Insu-lation board and SikaRoof® MTC.

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Volatile bituminous materials may stain and or softenbelow the coating.

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Areas with high movement, irregular substrates, ortimber based roof decks require a complete layer ofSikalastic® Carrier.

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Do not apply cementitious products (e.g. tile mortar)directly onto SikaRoof® MTC.

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BASIS OF PRODUCT DATAAll technical data stated in this Product Data Sheet arebased on laboratory tests. Actual measured data mayvary due to circumstances beyond our control.

LOCAL RESTRICTIONSPlease note that as a result of specific local regula-tions the performance of this product may vary fromcountry to country. Please consult the local ProductData Sheet for the exact description of the applicationfields.

ECOLOGY HEALTH AND SAFETYFor information and advice on the safe handling, stor-age and disposal of chemical products, users shall referto the most recent Safety Data Sheet (SDS) containingphysical, ecological, toxicological and other safety-re-lated data.

LEGAL NOTESThe information, and, in particular, the recommenda-tions relating to the application and end-use of Sikaproducts, are given in good faith based on Sika’s cur-rent knowledge and experience of the products whenproperly stored, handled and applied under normalconditions in accordance with Sika’s recommenda-tions. In practice, the differences in materials, sub-strates and actual site conditions are such that no war-ranty in respect of merchantability or of fitness for aparticular purpose, nor any liability arising out of anylegal relationship whatsoever, can be inferred either

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from this information, or from any written recom-mendations, or from any other advice offered. Theuser of the product must test the product’s suitabilityfor the intended application and purpose. Sika re-serves the right to change the properties of itsproducts. The proprietary rights of third parties mustbe observed. All orders are accepted subject to ourcurrent terms of sale and delivery. Users must alwaysrefer to the most recent issue of the local Product DataSheet for the product concerned, copies of which willbe supplied on request. It may be necessary to adaptthe above disclaimer to specific local laws and regula-tions. Any changes to this disclaimer may only be im-plemented with permission of Sika® Corporate Legal inBaar.

SikaRoofMTC-18-en-NZ-(04-2019)-2-1.pdf

Sika (NZ) Limited85-91 Patiki RoadAvondale, Auckland 1026New Zealand0800 745 269www.sika.co.nz

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