My car porch concrete flat roof has crack and it is leaking, how do I fix it?

Fixing crack with Sikadur®-20 Crack Seal

  1. Slightly widen and increase the surface on the existing cracks.
  2. Remove dit and dust from the cracks.
  3. Mixing: Pour component A & B into the bottle with 1:1 composition.
  4. Shake it slowly for 15–20 times until uniformly mixed.
  5. Apply mixed material into cracks / caviies until full. wait till it dries.


Apply SikaCoat®-500 Super

  1. Mix SikaCoat®-500 Super manually or use a low speed mixer until it is completely homogeneous prior to application.
  2. Apply a generous base coat of SikaCoat®-500 Super using roller or brush.
  3. when touch dry, apply another layer of SikaCoat®-500 Super at different direction.
What is the difference between a torch-on membrane and a self-adhesive membrane?

Torch-on membrane is applied using a torch gun to melt the underside of the membrane for adhesion onto the substrate.

A self-adhesive membrane is cold applied using the self-adhesive on the membrane for adhesion onto the substrate.

What are hot applied membranes?

The hot applied membrane is typically referring to a two-component product that uses a hot spray machine for application. The two-component hot spray machines can be adjusted to a specific mixing ratio, working pressure, and heated temperature.  

How do I terminate liquid applied membranes?

Liquid applied membrane is monolithic, seamless, and self-flashing. The termination should apply using the same material without any accessory.

Are liquid applied membranes root resistant?

Not all liquid applied membrane are root resistance. Kindly consult Sika for suitable root resistant product.

What equipment is needed to apply single component liquid applied membrane?

Lquid applied membrane can be applied using brush, roller, or airless spray.

What is wet film thickness? What is dry film thickness? How do I calculate the wet film thickness/dry film thickness of liquid applied membrane?

Wet film thickness (or WFT) is the measured thickness of any applied wet paint that is liquid-based before it cures. It is measured by using a WFT gauge.

Dry film thickness (or DFT) is the thickness of a coating as measured above the substrate. DFT is measured for cured coatings (after the coating dries).

The thickness of a coating depends on the product's technology and application. It is measured by using tools or equipment.

Does liquid applied membranes require a primer? What primer should I use for liquid applied membranes?

Sika always recommend using primer for the liquid applied membranes system. Appropriate primer application could consolidate the substrate, seals the pores and greatly improves the adhesion of the membrane to the substrate. The selection of primer is varying depend on chemical technology. Please refer to the manufacturer product data sheet for the primer selection.  

Can liquid applied membranes withstand ponding water?

Liquid applied membrane is not designed to be submerged in water. Prolonged submersion of liquid applied membrane in water will gradually disintegrate the membrane.

Liquid applied membrane is designed to keep water out of buildings and not store water. The gradient should be provided before the liquid applied membrane application to properly drain the water and also to fulfil the health safety purposes.

What is moisture triggered chemistry?

MTC - Moisture Triggered Chemistry incorporates a unique technology that allows the material to use atmospheric moisture to trigger the curing process. This means that the waterproof membrane is capable of curing in a wide range of conditions including extreme temperature ranges and humidity variations.  

What are the benefits of fibre reinforced liquid applied membrane?

The fibre reinforcement enhances the tensile strength, crack bridging ability and ensures sufficient consumption thickness of the waterproofing coating. The randomly oriented fibres within the mats give maximum multi-directional tensile strength to the membranes while allowing them to remain highly elastomeric. Fibre reinforced LAM system is highly recommended for any refurbishing projects.

What is the consumption of cementitious waterproofing for swimming pools? What is the minimum number of layers required?

Sika recommends consumption of 1.0 kg per m² per coat and a minimum of 3.0 kg/m² is required for swimming pool.

What waterproofing products shall I use for swimming pools under tiles (both floor and wall)?

Sikalastic®-1 KMY, a one component fiber reinforced, flexible cementitious waterproofing is the recommended product for swimming pool waterproofing before tiles for both wall and floor.

How do I waterproof gypsum wallboard?

Due to the porosity of the gypsum surface, Sika recommends a primer coat before the application of cementitious waterproofing. Sika® Primer-11 WMY is required prior to the application of SikaTop® Seal-107 (MY), SikaTop® Seal-109 MY and Sikalastic®-1 KMY.  

Shall I lay the levelling screed below or on top of the cementitious waterproofing?

Common practice in Malaysia is:

  • The finishing is tile, the screed is normally applied before the waterproofing.
  • Bare concrete (without tile), the screed is normally applied after the waterproofing.
What is an angle-fillet? What is Sika® SealTape F (edge sealing tape)? And how do I decide on which one to use?

An angle fillet is incorporated at the base angle to round off the 90° right angle at the wall to floor joint to form a 45° angle. A typical angle fillet is formed using cementitious based material. Thus, it is hard and non-deformable. An edge tape is a thermoplastic elastomer (TPE) that is elastic in nature. The edge tape is an elastic system component that is used in combination with Sika waterproofing mortar to form a high elastic and crack bridging sealing tape around the edge and corners. Cement sand with latex (or SikaGrout®) angle-fillet is sufficient when a concrete kicker is provided. An edge tape is recommended for drywall or precast systems and also when a concrete kicker is not provided.

What is the consumption of cementitious waterproofing for bathrooms, toilets, and kitchens? What is the minimum number of layers required?

Sika recommends a consumption rate of 1.0 kg per m² per coat and a minimum of two coats are required for bathroom, toilets, and kitchen.

What is the bond strength of cementitious waterproofing?

Typical bond strength of cementitious waterproofing mortar ranges from 0.5–1.0 N/mm², depending on the type and grade of the products.  

What is the difference between site mix and pre-bagged screed?

Site mixing is done at the site by mixing cement, sand, and water with the estimated quantity of each material. It is often not properly mixed and very inconsistent in terms of quality control.

A pre-bagged screed is produced and packed in the factory with the predetermined ratio to ensure the mixing is homogeneous and the quality is controlled.

Can I apply tile adhesive directly onto the cementitious waterproofing?

Yes, most cementitious based tile adhesives should be able to apply directly onto the cementitious waterproofing mortar. However, please contact the manufacturer(s) to ensure the compatibility between the two products.

What waterproofing products shall I use for toilets, bathrooms, and kitchens?

In general, any cementitious based mortar and liquid applied bituminous coating are suitable be used for these areas.