Water tank sealing in Harat Al Mazloum Jeddah
Harat Al Mazloum lies in the northeast inside the old wall, holding old coral stone houses fronted by wooden rawashin, with Souq Al Jami and Souq Al Badu, and the Al Shafi'i Mosque. Tanks here sit on old house roofs and narrow terraces, and old water, high humidity and sea salt damage linings fast. Sealing protects the tank from leaks and corrosion and returns it to safe service.
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Potable-rated materials
Linings and disinfectants cleared for drinking water tanks, not general-purpose products.
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You get the downtime first
How many hours the tank is out of service, told before we start rather than after we finish.
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A first-draw flush
We run the first draw off after refilling, and the tank is not handed back until the water runs clear.
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Ground and roof tanks
Villas, apartment blocks and premises that need a written record of each visit.
Why the job is different in Harat Al Mazloum
Buildings here date back over three hundred years to Jeddah's earliest quarters, and tanks mounted on rooftops face constant challenge from humid sea climate, salt spray and high moisture. The method is set out in full on how we approach Water tank sealing.
Tanks on roofs exposed to salt and humidity
Tanks sit directly on old coral stone house roofs with no protection from wind, rain and sea salt. High humidity and salt penetrate tank interiors through weak cracks and joints.
Old linings and very aged cement are weak
Tanks were built decades ago with weak cement. Original linings have corroded from salt and saline water until reinforcement bars show and deep cracks run through.
Joints and inlet pipes are narrow and hard to reach
Tanks sit in very narrow alleyways on small roof terraces. Tank access is tight and inlet and outlet repairs may be difficult from outside.
The character of Harat Al Mazloum
Historic district: close-set buildings, narrow lanes and ageing services
Harat Al Mazloum is a very old historic quarter with heritage coral stone houses. Tanks sit on tight roofs and access may be difficult. Treatment needs special care to avoid damaging old roofs and heritage fabric, and must be coordinated with long-standing residents.
What we read before any material is opened
A very old historic quarter in the northeast inside the wall, containing ancient coral stone houses with wooden rawashin, with Souq Al Jami and Souq Al Badu, Al Shafi'i Mosque, Baeshen House and Dar Qabil, reaching east to Bab Makkah.
Cracking in the wall
Surface corrosion starts at corners and floor-to-wall joints where water pools and salt concentrates.
The floor to wall joint
Major cracks in the lining come from salt water attack and slight movement of the tank on the old narrow roof.
The condition of the old lining
Salt and humidity enter through cracks, joints and gaps around pipe sleeves.
Sediment and scale
Salt and sea humidity are very high because the quarter is next to the sea and wind carries salt spray to the roof constantly.
The pipe entries
The original lining is failing and corroded to weak concrete and exposed reinforcement bars.
The hatch and the vent
Algae and salt crust build on the tank's outer surface, accelerating chemical and biological corrosion.
How we work
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1
Inspect with the tank empty
We drain it and read the surface dry: whether the water leaves through a crack, a joint or a pipe collar, and what the outer face of the wall and the ceiling below are telling us. A level test with the valves closed separates a leaking tank from leaking pipework.
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2
Clean and prepare the substrate
Sediment out, a high pressure wash, the loose old lining and the weak surface layer of the concrete taken back, then dried. The material grips sound substrate and nothing else.
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3
Make the cracks and joints good
Cracks are chased out and filled with a repair mortar, a cove is formed where the floor meets the wall, and every pipe collar is treated on its own.
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4
Lining, fill test, sterilisation
Successive coats, each run across the one beneath it, on the face the water touches. Then a full cure, a fill with the level watched, and sterilisation with the first fill run to waste before the tank returns to use.
What water tank sealing includes
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Finding where the water leaves
Carried out drained and dry: cracks, joints, pipe collars and the outer face of the wall.
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Draining and sediment removal
The last of the water and the settled layer on the floor come out, because a lining does not stick over sediment.
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Cracks and joints made good
The crack opened and filled, a cove formed at the floor to wall junction, and each pipe entry worked separately.
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Lining coats on the water face
More than one coat, each crossing the one below, in material made for drinking water tanks rather than roof waterproofing.
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Curing, fill test and sterilisation
The material is left to cure, the tank is filled and the level watched, then sterilised and the first fill run to waste. How long the cure takes follows the material and the weather, and we tell you before the date so you can plan around the supply.
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A follow-up level check
We come back once it is in service to read the level and check the outer face, because any remaining loss shows up then rather than on the day of the work.
What is different about Historic Jeddah Municipality
The Historic Jeddah municipality covers the quarters of Al Balad inside the old wall: Al Mazloum, Al Sham, Al Yaman and Al Bahr. The buildings are tall houses of coral limestone and timber rawashin, centuries old, standing shoulder to shoulder on narrow lanes that see little sun, many under restoration or partly vacant. The ground is low and close to the sea and the harbour, humidity stays high through the year, and popular souqs and eateries trade late into the night. Old timber, voids between walls and goods stores create conditions favoured by termites, cockroaches, rodents and wood boring beetles.
Questions about this district
Why do tanks in Harat Al Mazloum corrode so fast?
Salty water, high sea humidity and salt spray attack the lining constantly. Buildings are very old and tanks have faced the elements for decades.
Are small cracks in an old tank very dangerous?
Yes. In the old quarter where salt and humidity are very high, small cracks widen fast and cause leaks quickly.
What drives sealing costs up in old houses?
Tank size and tight roof space, plus difficult access and repair routes. Tanks on cramped terraces need more time and care.
Does new sealing protect the tank from salt and humidity?
Yes. Materials used are barriers against salt and humidity. After sealing, the tank is protected from salt-driven corrosion.
Do tanks in coral stone houses differ from modern ones?
Yes. Coral houses are older, roof spaces smaller and joints weaker. They may need special handling and more frequent inspection.
How often should an old tank be inspected after sealing?
At least every six months. Sea climate and salt accelerate wear even after new sealing.
How much does water tank sealing in Harat Al Mazloum cost?
It is set after the inspection, because the price follows the type of infestation, the size of the space, how far it has spread and the number of visits it needs. Send a photo and a description on WhatsApp and we will give you an estimate before we reach Harat Al Mazloum.
Nearby districts we cover
Other services in Harat Al Mazloum
Other services we provide to residents of Harat Al Mazloum.
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Water tanks
Water tank cleaning
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Water tanks
Water tank sterilization
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Water tanks
Tank leak repair
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Residential
Cockroach control
Need water tank sealing in Harat Al Mazloum? Tell us what you saw and we will tell you what it needs
We reach Harat Al Mazloum at a time we agree, and you get the full cost before we start.