SikaProof®-312 HDPE SG IN
Pre-applied fully bonded HDPE self-adhesive membrane with protective sand layer for below ground waterproofing
SikaProof®-312 HDPE SG IN is a unique HDPE based self adhesive fully bonded sheet membrane comprising of a virgin HDPE layer, coated with a high bond strength adhesive, covered by a weatherproof protective sand sprinkled layer, for below ground waterproofing of reinforced concrete structures. It is loose laid onto prepared substrates or formwork before fixing reinforcement and casting concrete. The adhesive layer is activated when the concrete is poured on the surface and forms a permanent bond with the fresh concrete which will prevent the ingress of water around the structure. Reinforcement can be directly laid on top of the membrane and it does not require screed protection.
- Pre-applied: Fixed before placing reinforcement and casting concrete
- Strong adhesive bond with fresh concrete
- High flexibility and crack-bridging capabilities
Usage
SikaProof®-312 HDPE SG IN can be used for damp-proofing, waterproofing and concrete protection for basements, subway, tunnel and other below ground concrete structures against ground water ingress. Suitable for use on:
- Reinforced concrete base slabs
- Reinforced concrete walls with single and doublefaced formwork
- Reinforced concrete footings and grade slab
- Extension and reconstruction works
- Prefabricated structures
Packaging
Standard rolls are wrapped individually in a PE-foil
Roll length | 20 m |
Roll width | 1.2 m, 1.5 m, or 2.0 m |
Advantages
- Pre-applied: Fixed before placing reinforcement and casting concrete
- Strong adhesive bond with fresh concrete
- High flexibility and crack-bridging capabilities
- No lateral water migration between the concrete structure and the membrane system
- High watertightness tested according to various standards
- Fully and permanently bonded to the reinforced concrete structure
- Resistant to aggressive conditions in natural ground water and soil
- Easy to install with fully adhered joints
- Temporarily resistant to weathering and UV exposure during construction
- Made up of non-recycled / virgin HDPE for long durability
- Eco-friendly material
- Sound anti-puncture performance
- Adaptable to settlement and distortion
- Can be combined with other approved Sika® Waterproofing / Joint Sealing Systems
Colour
HDPE side White Adhesive side Off white
Product Details
Product declaration
Bonded sheet membrane according to IS 16471 : 2017
Chemical base
HDPE sheet membrane with adhesive layer and sand topping
Shelf life
12 months from date of production
Storage conditions
The product must be stored in original unopened and undamaged sealed packaging in dry conditions and temperatures between +5 °C and +30 °C. Protect from direct sunlight, rain, snow and ice, etc. Store in a horizontal position. Do not stack pallets of the rolls on top of each other, or under pallets of any other materials during transport or storage.
Effective thickness
| HDPE film | > 0.80 mm |
| HDPE membrane composite | ≥ 1.20 mm |
System structure
The following system products must be used:
- SikaProof®-312 HDPE SG IN sheet membrane
- SikaProof® Sandwich Tape-100 IN double sided self-adhesive tape
Ancillary products:
Accessories and complementary products are available to provide detailing and connection solutions
Resistance to static puncture
| ≥ 1000 N | (ASTM E154) |
Tensile strength
| ≥ 25 MPa (film) | (ASTM D412 mod) |
Elongation
| ≥ 550 % | (ASTM D412 mod) |
Adhesion in peel
| ≥ 900 N/m | (ASTM D903 mod) |
Joint peel resistance
≥ 1500 N/m | (ASTM D1876) |
Foldability at low temperature
| Unaffected at -23 °C | (ASTM D1970) |
Water absorption
< 0.5 % | (ASTM D570) |
Water tightness
| > 71 m of hydrostatic head | (ASTM D5385 mod) |
Permeability to water vapour
< 0.10 ng/Pa·s·m2 | (ASTM E96, method B) |
Application
Ambient air temperature
+5 °C min. / +40 °C max
Substrate temperature
+5 °C min. / +40 °C max
APPLICATION INSTRUCTIONS
IMPORTANT
Strictly follow installation procedures
Strictly follow installation procedures as defined in Method Statements, application manuals and working instructions which must always be adjusted to the actual site conditions.
EQUIPMENT
- Measuring tape
- Marking pen
- Razor knife
- Scissors
- Pressure roller
- Clean lint-free cloth
- Metal straight edge for cutting
- Hot air gun (Leister Triac)
SUBSTRATE QUALITY
IMPORTANT
The substrate application surface must be smooth, uniform and clean with no standing water.
SikaProof®-312 HDPE SG IN must be applied on a sufficiently stable substrate to avoid movement during the construction works. Large gaps and voids (≥ 12–15 mm) must be filled before membrane installation. Substrate can be damp or slightly wet. Suitable membrane fixing substrates include:
- Concrete blinding
- Formwork
- Rigid thermal insulation
- Plywood sheets / form
- Shotcrete
- Dimpled sheet drainage board
APPLICATION
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 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 60 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 and transverse joints
Side lap joints of SikaProof®-312 HDPE SG IN are sealed by overlapping the membranes by 80 mm to 100 mm and removing release liner in longitudinal direction. Transverse joints shall be sealed by removing the granular sanded layer with a hot air tool (scraping) and then overlapped by 80 mm to 100 mm and bonded and sealed with cold applied SikaProof® tapes. Use rollers to release air pockets within joints to ensure proper sealing and bonding. The tape and selvedge adhesive can be heated by hot air gun to remove moisture or condensation and improve initial adhesion in cold conditions.
Detailing
Form all details and connections using the appropriate SikaProof® ancillary products outlined in the Sika® Method Statement: SikaProof®-312 HDPE SG 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 60 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 IN system must be protected with an appropriate protection sheet as soon as possible or at the latest within 60 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 IN