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Cost-effective remedial waterproofing of a damp rumpus room

Waterproof membrane (NSM 100+) is a two-component acrylic modified cementitious coating - Waterstop Solutions

Cost-effective remedial waterproofing of a damp rumpus room


Installation of cementitious waterproofing membrane and leak sealing injection of rumpus room


Waterstop Solutions leak sealing and remedial waterproofing specialists recently inspected a rumpus room where there is bare earth on the outside of the wall underneath the house. This creates a high humidity environment for moisture ingress to occur into the rumpus room.

We also inspected the floor/wall joint in the same room, along the area between the cupboard and the window, identified by the client as experiencing water ingress. Floor/wall joints (cove joints) are vulnerable to seepage and a common point of entry for water.


Our remedial waterproofing recommendation:


  1. To reduce the moisture ingress from outside the wall, we recommend installing a polymer modified cementitious waterproofing membrane in multiple layers over a water-based epoxy primer to the back of the rumpus room wall (positive side).


Our waterproof membrane (NSM 100+) is a two-component acrylic modified cementitious coating that is flexible so that it can handle a small amount of movement.

This membrane is a hardwearing, seamless waterproofing membrane for effective concrete protection. It also provides an effective barrier to waterborne salts and atmospheric gases.

The NSM 100+ system is breathable. Whilst repelling water, it allows moisture to pass through it slowly as a vapour, allowing the substrate to breathe.

It is water-based, so any vapours are non-toxic and ideal for potable water usage and it can be painted over in water-based breathable paints (e.g. low sheen or matt acrylics) and most water-based after-trades such as direct stick, tiles or render.


  1. Perform leak sealing injection of the floor/wall joints alongside the inside wall of the cupboard to the window.


We do this by intersecting the leaking floor/wall joints in the rumpus room at intervals of approx. 200mm and inject a water-reactive polyurethane resin at high pressure into the targeted areas to form a durable watertight seal that bonds strongly within the concrete.

Our technicians manage the injection process to create a continuous three-dimensional seal buried in the concrete using a combination of proprietary methods, developed and honed over thousands of projects.

After allowing the polyurethane to react and bind with any water present in the crack and surrounding concrete to form a flexible seal, the injection ports are removed and holes filled with a suitable rapid set concrete repair material.


Watch our work progress and results in this video:


Give us a call to discuss the best protective treatment application for your vertical and horizontal surfaces to help you choose the appropriate product and methods to protect them and how to best prepare the surface before installation for best performance.

If you have any issues with water ingress, rooftop leaks, leaking balcony, leaking basement, cracking concrete slabs, structural cracks, concrete deterioration, spalling concrete, concrete cancer, deteriorated joints, moisture, seepage, efflorescence, rising damp and/or high-flow active leaks in concrete structures, we would be happy to assist you. You are welcome to contact us with any questions that you may have.


Brisbane office: (07) 3205 1899   


Sydney office: (02) 9346 8308   

Email: [email protected]


Are you interested in finding out more about the various remedial building services we are providing?

Please click on the image below to download Waterstop Solutions Capability Statement

Waterstop Solutions Capability Statement

Waterstop Solutions Capability Statement is now available to download as PDF. (The image is clickable and opens up a link to our Capability Statement). 




Good maintenance begins with a proactive approach to maintain, keep, preserve and protect a building. 

Remember that seepage/water ingress into areas such as balconies, basements, concrete roofs, car parks and retaining walls, should not be ignored – call a remedial waterproofing professional today for an assessment to provide you with the best solution for your situation.

At Waterstop Solutions, we carry out a wide range of remedial works to concrete structures post-construction stage in Brisbane, Gold Coast, Sunshine Coast, Sydney and outlying areas in Queensland and New South Wales.

Equipped with major civil works experience, we can quickly determine the best approach to rectify all seepage and concrete deterioration issues.


It takes licenced remedial waterproofer and leak sealing experts like us at Waterstop Solutions to ensure that the pathways for water to ingress are properly sealed off. A depth of technical knowledge and experience, along with a proud reputation for integrity and reliability, has made Waterstop Solutions the go-to company for many Defect Managers working for major construction companies across Queensland and New South Wales.

We at Waterstop Solutions have the technical and practical expertise to diagnose the source of the leak and will provide you with our recommended solution to achieving an effective, high-quality, long-lasting repair to stop the water ingress with minimal disruption

We believe in and are committed to always delivering high-quality solutions by utilising the right products and techniques for each specific project combined with our industry-leading know-how on tap. We have a large talent pool of specialist leak sealing and concrete repair technicians with Certificate III in construction waterproofing in Queensland and New South Wales that are extensively trained in our systems and project execution methods.

The leadership positions on every Waterstop Solutions project are operated by highly qualified, certified and experienced industry professionals. Our in-house skills and expertise gained from more than 60 years of industry experience provide a full range of high-quality remedial waterproofing and concrete repair works to commercial buildings, civil infrastructures, industrial sites and residential properties. From waterproofing diagnostics, preventative and remediation solutions – All of our waterproofing solutions are quality guaranteed.


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