SikaRoof® PUR-18
SikaRoof® PUR-18 is a 2-part, cold-applied, polyurethane hybrid liquid applied membrane roof waterproofing system. The system is highly elastic and UV-stable which provides a durable waterproofing solution and conforms to the ETAG-005 guidelines.
- Conforms to the ETAG-005 guidelines
- Top coat provides resistance to permanent UV exposure
- Reflective roof coating to enhance energy efficiency
- Top coat has low dirt pick up
- Good crack-bridging properties at low temperatures
- Resistant to ponding water
- Thickness: 2.3 – 2.6 mm
- Easily re-coated when needed - no removal of previous coats required
- Seamless finish
- Cold applied - requires no heat or flame
- Vapour permeable
- Resistant to many common environmental influences
- Available in many colours
- Top coat in-pail tinting available
System Structure
Usage
The product can be used for the following roof waterproofing applications:- Flat and sloping fully exposed roof structures
- Failing roofs to extend the service life
- New construction and refurbishment projects
- Roofs with numerous details such as penetrations, drains, roof lights and complex geometry
- Cool and solar roofs when used in combination with Sikalastic®-701 (~ RAL 9016)
- Alternative option for small projects where application machinery is not practical
- Aluminium
- Brass
- Bitumen sheet membranes
- Bituminous coatings
- Bricks
- Cementitious
- Concrete slabs
- Copper
- Existing liquid applied membranes
- Galvanised steel
- Lead
- Ferrous metals
- Stainless steel
- Stone
- Unglazed ceramic tiles
Advantages
- Conforms to the ETAG-005 guidelines
- Top coat provides resistance to permanent UV exposure
- Reflective roof coating to enhance energy efficiency
- Top coat has low dirt pick up
- Good crack-bridging properties at low temperatures
- Resistant to ponding water
- Thickness: 2.3 – 2.6 mm
- Easily re-coated when needed - no removal of previous coats required
- Seamless finish
- Cold applied - requires no heat or flame
- Vapour permeable
- Resistant to many common environmental influences
- Available in many colours
- Top coat in-pail tinting available
Packaging
Refer to individual Product Data Sheet (Sikalastic®-702, Sikalastic®-701)
Colour
| Final colour | White |
The product can be coloured locally with Sika® In Pail Tinting (IPT) machines. For more information, consult the local Sika customer service.
System Details
APPROVALS / STANDARDS
- CE Marking and Declaration of Performance to European Technical Assessment ETA-20/0248, based on ETAG 005 Part 1 and Part 6 — Liquid applied roof waterproofing kits. Part 1: General. Part 6: Specific stipulations for Kits based on Polyurethane
- Water-Vapor Diffusion Rate, Sikalastic-702, Request AR-2019-0072en, Sika
- Capillary absorbtion, Sikalastic-702, Request AR-2019-0072en, Sika
- Capillary absorbtion of water, Sikalastic-702, Request AR-2019-0072en, Sika
- CO2 - Diffusion Flow, Sikalastic-702, Request AR-2019-0072en, Sika
- Water Vapour Transmission (1.5 mm system), Sikalastic®-701, Sikalastic®-702, Award, Report No. R2273
- Chemical Resistance, Sikalastic®-701, Assessment, Sika
- Abrasion resistance AR0.5(Special), Sikalastic®-701, Sikalastic®-702, FACE, Test report No. FC/18/8048
- Final Solar Reflectance per ASTM C1549, Final Thermal Emittance per ASTM C1371, Final Solar Reflective Index for the top coat Sikalastic®-701, MTL, Report No. 2018-356
System Structure
SikaRoof® PUR-18
| Layer | Product | Consumption |
| 1. Primer | Depends on type of substrate | Refer to individual Product Data Sheet |
| 2. Base coat | Sikalastic®-702 | ~2.5 – 2.8 kg/m2 |
| 3. Top coat | Sikalastic®-701 | ~0.35 kg/m2 |
IMPORTANT
The system structure layers as described in table must not be changed.
Note: Sikalastic®-702 is not resistant to long term UV-light exposure and must be overcoated with Sikalastic®-701 within 4 weeks.
Note: On vertical or inclined surfaces, add up to 2 % of Extender T (by weight) into Sikalastic®-702 to increase sag resistance. Alternatively use Sikalastic®-702 THX.
Note: These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level, wastage or any other variations. Apply product to a test area to calculate the exact consumption for the specific substrate conditions and proposed application equipment.
Composition
Elastomeric aromatic and aliphatic PU/PUA hybrids
Shelf Life
Refer to individual Product Data Sheet (Sikalastic®-702, Sikalastic®-701)
Storage Conditions
Refer to individual Product Data Sheet (Sikalastic®-702, Sikalastic®-701)
Dry film thickness
| ~2.3 – 2.6 mm | (ETA-005 for all flat roofs) |
Tensile Strength
| ~10.0 N/mm2 | (DIN EN ISO 527-3) |
External Fire Performance
| Broof T1 / Broof T4 | (DD ENV 1187) |
Reaction to Fire
| Euroclass E | (EN 13501-1) |
Solar Reflectance
| Initial Solar Reflectance | 0.88 |
Thermal Emittance
| Initial Thermal Emittance | 0.86 |
Solar Reflectance Index
| Initial SRI (Convective Coefficient, Medium Wind) | 112 |
Application
Ambient Air Temperature
+5 °C min. / +40 °C max.
Relative Air Humidity
25 % min. / 85 % max.
Substrate Temperature
+10 °C min. / +60 °C max.
Dew Point
Beware of condensation.
The substrate and uncured applied layers must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the membrane finish.
Substrate Moisture Content
The following test methods can be used to determine the substrate moisture content:
- Sika®-Tramex meter
- CM-measurement
- Oven-dry-method
Substrate Pre-Treatment
Note: Confirm adequate surface preparation and Product adhesion, by carrying out a small trial before full application together with adhesion tests as required.
Note: For the primer consumption rates and waiting time / overcoating, refer to the appropriate Product Data Sheet.
Note: Other substrates must be tested for their compatibility. If in doubt, apply a test area first.
Substrate primers
| Substrate | Primer |
| Cementitious | Sika® Concrete Primer / Sika® Concrete Primer LO/ Sikafloor®-161 |
| Brick, Stone | Sika® Concrete Primer / Sika® Concrete Primer LO/ Sikafloor®-161 |
| Concrete slabs, Unglazed ceramic tiles | Sika® Concrete Primer / Sika® Concrete Primer LO/ Sikafloor®-161 |
| Bitumen sheet membrane, Bituminous coatings | Sikalastic® Metal Primer |
| Aluminium, Brass, Copper, Galvanised steel, Lead, Ferrous metals, Stainless steel | Sikalastic® Metal Primer |
| Existing SikaRoof® Liquid Applied Membrane | Sika® Reactivation Primer / Sika® Concrete Primer |