The document summarizes the causes and solutions for water leakage and dampness occurring on ceilings beneath concrete slabs or tiled surfaces on rooftops. Moisture from dew, rain, or overflowing water tanks is able to permeate through the porous concrete or grout joints of tiles and accumulate on the ceiling below, sometimes causing mildew growth or structural damage. To prevent this, the document recommends using a seamless waterproof floor system that creates an impermeable barrier, resisting water absorption and microbial growth.

2. INTRODUCTION
If your water tank is not on an independent
scaffold but instead on a concrete slab or on a tiled
surface at the top of your building, you may be
experiencing water leakage or dampness on the
ceiling beneath the concrete slab or tiled
surface area.
Water Tank On Scaffold
Platform

3. HOW DOES THIS OCCUR?
This dampness or leakage is caused by dew and
rainfall, even though you may have drainage
channels on your roof top.
It could also be caused by overflowing water from your
water tank, where a float master
(used to control the water level in your tank) is not
Installed. The water gets on the concrete slab or tiled floor
and through the micro-pores of the concrete or the
cementitious grouts of the tiled surface it permeates to the
ceiling below.

4. The primary reason why you may notice leakage
and dampness on the ceiling beneath the roof
top concrete slab or tiled floor is because…
…concrete is a permeable floor and it absorbs and retains
moisture and water, this water then finds its way to your
ceiling and when the ceiling is weak the water sips
through.
You will usually see a discoloration as the ceiling would
appear greyish-green or brown indicating the presence of
microbial growth (i.e. mildew, mold, algae and fungus).

5. Image 1, shows a concrete floor surface on a roof top, it is porous and allows
water to penetrate its surface.
Image 2, shows the presence of mildew on the outside ceiling of a fast food
restaurant.
Image 3, shows the effects of water loads on the roof top concrete slab of
the fast food restaurant, you can see the mildew and the water load
pressure on the ceiling as it appears to cave in.
1 2 3

6. …tiled floors are not seamless and so provide a point
of weakness and penetration for water at it’s joints,
the grout used at the joints by tilers comprise only of
Coloured Portland Cement which is porous and will
absorb and retain moisture and water.
Water has caused the tile
to pull off and now it can
find its way to the ceiling
beneath.

7. THE DANGERS
 The water absorbed and retained by the roof top
floor can lead to a collapse of the ceiling because
of the sheer volume of the water load.
 The collapse of the ceiling could be fatal to life.
 There will be substantial damage to property.
 The mildew is a health risk and should be
controlled.
 The cost of repair and/or replacement of property
and flooring can be expensive.

8. A CRACKED CEILING WITH MILDEW
This is a picture of a ceiling beneath a tiled-
roof top, water tank housing floor surface.
It is cracked with mildew present.
cracks
mildew

9. WHAT IS THE SOLUTION?
The solution to this challenge is simple!
Use a Seamless
Waterproofing Floor
System.

10. SO WHAT IS A SEAMLESS WATERPROOFING FLOOR?
A seamless waterproofing floor system is an
Impermeable, all weather - durable floor.
It is resistant to moisture, salt and fresh water and
does not allow the growth of microbes.
A seamless
waterproofing floor
system.

11. Tiles allow moisture and water
penetrate through its joints.
A seamless waterproofing floor
resists water and moisture
with ease.

12. IS IT AVAILABLE?
Yes it is, there is a cost effective seamless waterproofing
floor solution called the Brush Bond Floor System.
This floor system is…
• impermeable, it is resistant to moisture and water
absorption
• safe, it does not permit the growth of microbes
• durable, it has a service life exceeding 15 years
• cost effective in both the short and long term.

13. WHO ARE WE?
Osaji Onochie Consult comprise of commercial and
industrial flooring professionals with over 15 years
experience in providing cost effective floor solutions to
individuals and corporate entities in Nigeria.
Our services:
 Industrial and commercial flooring consultancy service
 Site inspection (non-destructive substrate testing)
 Industrial and commercial floor system installation

14. CALL US NOW:
We Bring Our Business To You!
Our lines are open 24 Hours a day, 7 days a week
D/L: +234 8032271473, +234 8032294611
Website: www.osajionochieconsult.com
Email: osajionochieconsult@yahoo.com
Follow us on twitter: @osajioconsult

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