IMPORTANT
Application by trained personnel
The application of this Product must only be carried out by an applicator that is trained or approved by Sika.The applicator must also be experienced in this type of application.
IMPORTANT
Unsuitable weather conditions for application
Do not install the membrane during continuous or prolonged rain, snowfall or sandstorm. If SikaProof®-312 HDPE SG W IN is to be applied below +5 °C, exceptions are possible under special circumstances with appropriate precautions. Contact Sika Technical Services for more information.
IMPORTANT
Penetrations and construction joints
Additional Sika joint sealing solutions must be used for connections around penetrations and for construction joints.
IMPORTANT
Use of double-faced formwork
In cases of double-faced formwork, the membrane may show debonding from concrete, this does not affect the watertight performance of membrane. It is preferred to use post applied systems in projects with double-faced formwork.
IMPORTANT
Covering the membrane system
Permanent exposure to UV light will reduce the performance of the membrane system.
- Concrete must be placed within 45 days after membrane system installation.
- Proper concrete installation (mix design and workmanship) is required to achieve optimum bond of the membrane system to the concrete.
Installation method
After substrate conditions have been fulfilled, the waterproofing membrane is installed by loose laying onto horizontal / inclined substrates or fastening onto vertical substrates.
Longitudinal joints
Side lap joints of SikaProof®-312 HDPE SG W IN are sealed by overlapping the membranes by 80 mm in selvedge provided and hot air welding or thermal jointing in longitudinal direction. Prior to this the sheet is to be cleaned with dry cloth and aligned properly. No dust, oil traces and contamination should be present on selvedge. The weld joint is made with suitable heat welding machine with a temperature range +275 °C to +375 °C and speed of 0.8 to 2 m/min. Temperature and speed to be adjusted as per environmental conditions. Any level differences below membrane will affect weld joint.
Transverse joints
Transverse joints shall be sealed by removing the granular sanded layer with a hot air tool (scraping) and then overlapped by 80 mm and jointing in same way as longitudinal joints.
Detailing
Form all details and connections using the appropriate SikaProof® ancillary products outlined in the Sika® Method Statement: SikaProof®-312 HDPE SG W IN.
Inspection and quality control of installation
A final inspection before placing concrete must be carried out to ensure the complete membrane system has been correctly installed, any damage repaired, and the surface of the adhesive layer is clean.
Concrete placement
Place concrete directly onto or against the membrane within 45 days after installation. No mortar or protection screed must be used before placement of reinforcement and concrete.
Formwork removal
After removing the formwork, all penetrations such as shuttering anchors, any membrane damage and construction joints must be sealed using the appropriate SikaProof® ancillary products or complementary Sika® Waterproofing Systems.
Backfilling protection
After formwork removal and before backfilling, SikaProof®-312 HDPE SG W IN system must be protected with an appropriate protection sheet as soon as possible or at the latest within 45 days.
Note: Suitable ancillary systems such as spray applied coatings, liquid applied membranes, preformed modified membranes may be used in vertical and detailing applications. Please seek advice on these transitions from Sika Technical Services.
Reference must be made to the Sika Method Statement: SikaProof®-312 HDPE SG W IN
