Identifying and fixing leak sources, relevant cracks and water flow on a flat concrete roof?


I'm asking this here to avoid being conned by "professional" roofers in India who either exaggerate their estimates or send highly unskilled labourers to do the job.

This is the layout of a roof:

D: Areas that are damaged
H: Drainage holes
P: Ponding areas (places where water accumulates and does not flow away)
C: Small cracks that may or may not be significant for consideration

D2 was an area where a solar water heater was installed and after it was removed, one strip of the roofing got damaged and cement was applied on it (as in the pic below). It hasn't caused any leak problems for 5 years, and the area only started leaking during last year's rains.

H1 and H2 are the only points for water drainage on the entire roof (I do believe the roof is slightly sloping toward H1 and H2). Because of D2 having some elevation, some of the water collecting in P1 was not able to flow to H2 (blue arrow) and was not flowing to H1 either. ...

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Concrete roof repair is often necessary because concrete is susceptible to scaling, cracking, crazing, spalling, and a host of other issues with regular wear and tear. In most cases, minor, timely repairs and regular maintenance will ensure that there is no structural damage. The root problem when using concrete as a roofing material is that concrete is porous and retains moisture.

Read on to learn some quick do's and don'ts when dealing with concrete roof repair.

Do Waterproof Your Roof

The most common complaint with regard to both concrete tile and flat concrete roofing is water leaks. When there are leaks in a flat concrete roof, the fast fix is usually to apply some kind of sealant or waterproof cement at the site of the leak. Most of the times, cracks can be filled with similar caulking materials to prevent further damage.

Keep in mind that even concrete that is free of cracks or damaged is still very porous and able to retain moisture. The best...

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Indoor Mold

For people, water is necessary for survival. However, for a house, water can be a destructive force that can lead to wood rot, peeling paint, insect infestation, shorter lifespan of roofing and siding and higher maintenance costs. And if you’re not careful, water inside your home can easily provide a natural habitat in which molds thrive.

Investigate, Identify and Repair All Leaks and Cracks

The best way to prevent water damage from rainwater and snowmelt is to ensure the exterior materials of the building are properly constructed and maintained. The following are tips for identifying and eliminating sources of water intrusion in your home. Common places where water intrusion occurs:

Windows and Doors: Check for leaks around your windows and doors, especially near the corners. Check for peeling paint, it can be a sign of water getting into the wood. Inspect for discolorations in paint or caulking, swelling of the window or doorframe or...

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Concrete roofs wear down over time, developing cracks, chips and fissures that allow water down into your home. The best way to waterproof these roofs is to apply a waterproof roof coating. Urethane offers the best degree of waterproofing for concrete and is not too expensive, according to Wade L. Vorley, a Seattle, Washington, roof consultant for more than 20 years. Work on this project on a clear, dry weekend when no rain is forecast, and expect to use a lot of elbow grease.

Things you need

Pressure washer (optional)



Stiff bristle scrub brush

Rubber seam tape

Urethane primer

Paint tray

Paint roller

2 roller covers with 1-inch nap

Urethane waterproof roof coating

Get up on your roof on a dry day to find the leak. Look for rings of dirt or small holes in the concrete to indicate spots where large puddles form and leak. Also examine the flashings or metal edges of the roof, common...

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The background: Your roof slab's concrete has shrunk due to insufficient curing / improper lateral support.

Curing is the process of maintaining sufficient moisture to prevent concrete from losing water due to internal hardening (setting / hydration)

Thus, it has lost its shape leading to development of cracks.

Temporary solution : Buy Tarpaulins to cover your roof, stitch them together and place them over your house. Ensure you place sufficient weight over those sheets since you risk them flying off!!.

This works very well and you could see many buildings with such covers in Mumbai city.

Dont worry about the shabby look. Its a worthy temporary remedy.

150GSM tarpaulins are sufficient and there are many people who stitch them professionally.

After the rains get over, get professional water-proofing agents.

1. Ask them to first close the cracks with non-shrink grout materials by pressure grouting.

2. This will eventually...

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Flat roofs are generally sturdier and less prone to wear and tear than either tiled or wooden roofs, but that doesn’t mean they are completely immune to problems. One of the primary problems faced by properties with flat roofs is leaking, which will soon become noticeable when it happens (it’s rather hard not to notice when it’s raining indoors!). Checking the roof will be easier than with a traditional roof as it will be more stable and easy to walk on without dislodging any shingles or falling through the roof completely, which is perfectly possible, especially if there’s a large amount of moisture present. The point of penetration (the source of the leak) should be quite clearly visible, but it might not always be exactly above the point where the leak starts inside.

This is because the water could be entering the top layers and then running between subsequent layers until it finds a weak spot to break through.

Fixing it

In many cases, simply fixing the...

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"I Love Mum"

Now that the rain is starting and, of course, all our roofs are leaking in true Balinese style. The Ubud branch of Drips Anonymous (the support group for leaking roof sufferers) has started having meetings again as leaking roofs make peoples lives unmanageable.

But did you know that roofs here are supposed to leak? it is a cultural thing. The spirit of leaking roofs has to be appeased. When it rains the people must remember to honour the spirits or they might become mischievous and everyone will get really grumpy so, to maintain harmony and balance in the face of precipitous frustration an upacara is held during which buckets and bowls are blessed and then placed around the house in strategic positions while chanting spiritual words like “it's pissing in over here, quick get me a bowl.” No one is allowed to think that they are above their station in life and so these days building design demands that everyone has to have a leaking roof.

There are...

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A terrace is nothing less than the extension of pure living space. Its a place to relax with family and meet people on a get-together, till it is decently maintained.

A roof slab is subject to severe weather conditions round the year. The absence or inadequate waterproofing in this areas can lead to variety of problem like leakages in ceilings below terrace floor, dampness in parapet walls or seepage in the terrace slab. Thus, it is important to avoid cracks in slab in first place and waterproof it to prevent from these problems from occurring in future.

Before understand the repair procedure, you need to understand the typical cross-section of Terrace Waterproofing:

Structural Concrete (Roof Concrete)Waterproof Coat (Elastomeric Polymer)Protective Screed (12.5 mm thick)Brickbat Coba (in Slope 75-125 mm)Finishing Screed (20-25mm)

Step by Step Rectification of Water Leakages in Terrace Slab:

If there are leakages and visible cracks on roof, the...

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Need help on all things about repairing leaking roofs?

Welcome to the roof repairs help page where you will find the answers to the most common questions and problems associated with leaking roofs that are not only relevant to Western Sydney – but are common to most Australian roofs.

Click topic on the index to go straight to the roof help topic that you are looking for on the right…or just scroll down the page

If you have any special problems go to my contact page.

How do I get a quote for my roof work?

I provide a free written roofing quote for the majority of my work.
The best way is to contact me via my my contacts page. This means that you can give me all your details – without me getting anything wrong. Then I will get back to you as soon as I am able to arrange for a suitable time to come out to take a look at the roof and it’s problems.

You can ring me on 97460178 Be prepared to leave a...

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