Terrace Waterproofing

Step-by-step Guide for Waterproofing a Terrace

The terrace is the most crucial part of the building, protecting people from rain, heat, and extreme weather conditions across all seasons of the year. It is necessary to waterproof your terrace to enhance the durability and longevity of your property. 

What is Terrace Waterproofing?

Terrace waterproofing is the process of applying a protective layer or coating to your roof terrace to prevent water from seeping through and causing damage to the underlying structure and interior of your building. It acts as a shield against the elements, ensuring your roof remains leak-proof and functional.

Step-by-step process of New Concrete Slab (Terrace) Waterproofing

Step 1

Ensure the new concrete slab is thoroughly cleaned, removing all traces of dust, dirt, oil, grease, and grime.

Step 2

Conduct a thorough examination for any cracks, dampness, or leakages and treat the leakages by filling the crack with POLYFILL AR. Hollow areas must be pressure grouted with a slurry of cement admixed with two pouches of SUNPLEX. Construction joints must be treated with polymer-modified mortar. Flood the entire terrace slab area with water for 48 – 72 hours and check for leaks on the underside after the initial treatment. Carry out further repairs if leakages are still seen. 

Step 3

Allow the hydro-tested and prepared terrace slab to dry naturally. Prepare a slurry coating by combining 1 kg of Polyalk WP with 1 kg of cement. Ensure thorough mixing using a low-speed stirrer to achieve a lump-free consistency, without adding any water. Prepare only as much slurry as can be utilized within 30 minutes and apply it evenly on the bare slab using a brush.

Step 4

Wait for 24 hours after the first application, then proceed to apply a second coat of the freshly prepared POLYALK WP slurry coating, maintaining the same proportions as before.

Step 5

Allow the surface to undergo air curing for a period of 24 to 48 hours.

Step 6

Ensure the coating is cured by covering it with damp gunny bags for a duration of 4 to 5 days.

Step 7

After the curing process, flood the entire terrace to test the effectiveness of the waterproofing treatment applied. Treat leakages if any. 

Step 8

Protect the waterproofing coating by laying a protective course of tiles, IPS, brickbat coba, or any other final finish. If applying IPS or brickbat coba, enhance the mortar mix, and add SUNPLEX (330 gm pouch) to every 50kg bag of cement used in the brickbat coba.

Advantages of Waterproofing a New Terrace Slab

Prevents Water Seepage

Waterproofing stops water from penetrating the building structure, thereby preventing damage to the concrete and steel reinforcements.

Reduces Maintenance Costs

By protecting the structure from water damage, waterproofing extends the lifespan of the building and reduces the need for frequent repairs and maintenance.

Prevents Mold and Fungus Growth

It helps avoid the growth of mold and fungus, which can cause health issues and degrade building materials.

Protection Against Weather Elements

It provides resistance against harsh weather conditions, such as heavy rains, snow, and extreme temperatures, ensuring the terrace remains in good condition.

Increases Lifespan

Effective waterproofing significantly enhances the overall lifespan of the terrace and the building by preventing structural damage caused by water infiltration.

Creates Usable Outdoor Space

Waterproofing makes the terraces more durable and comfortable, making them ideal for recreational or gardening purposes. 


Sunanda Global’s waterproofing solutions provide expert protection to your structures. POLYWALK WP is one of the many waterproofing coatings we offer. It has excellent water resistance, high flexural strength, and extraordinary adhesion. It is the most practical and proven polymeric waterproofing solution. SUNPLEX is a waterproofing admixture that is compatible with all types of cement and can prevent water passage and protect the structures from degradation. 

In conclusion, Sunanda Global’s waterproofing solutions are not just about providing protection, they are about ensuring the longevity and integrity of your structures. Let us help you transform your terraces into durable, weather-resistant, and enjoyable spaces, adding value to your property and peace of mind in knowing your investment is well-protected.