Water tank sealing in Tarwiyah Makkah
Tarwiyah is a brand new district between Al Sharai and Al Rashidiyah with new apartment buildings, villas and residential plots on a regular grid. Tanks were built very recently on solid foundations, but new concrete shrinks quickly and direct sun exposure causes early cracking. Wadi Mudarraja on the eastern edge affects ground moisture levels.
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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 Tarwiyah
Buildings in Tarwiyah are brand new and tanks were built to high standards. Shrinkage cracks appear quickly especially in exposed rooftop tanks. The method is set out in full on Water tank sealing in detail.
New apartment buildings on solid foundations
Buildings in Tarwiyah were built to modern standards with reinforced concrete foundations. But tanks on roofs are exposed to expansion and contraction because the concrete is very new.
Intense sun and seasonal wind exposure
The district is new and its street grid is open. Tanks on rooftops have no shelter. Direct sun and wind from Wadi Mudarraja accelerate shrinkage cracking.
High ground moisture from the wadi channel
Wadi Mudarraja raises ground moisture levels and new concrete absorbs this moisture, causing faster shrinkage. This accelerates crack formation.
Landmarks of Tarwiyah
Access to Tarwiyah runs via King Faisal Road from the south and Al Jaranah Road from the west. King Abdulaziz Sports City to the north-east and Wadi Mudarraja to the east mark the district landmarks.
- King Abdulaziz Sports City
- King Faisal Road
- Al Sawwat Mosque
- Wadi Mudarraja
- Basanbal Market
What we read before any material is opened
A new residential development scheme east of Al Sharai between Al Sharai and Al Rashidiyah south of King Faisal Road. New apartment buildings and villas on a regular grid. Wadi Mudarraja forms the eastern boundary and King Abdulaziz Sports City stands to the north-east.
Cracking in the wall
The internal surface of a new tank is relatively smooth but damp and porous. We clean it thoroughly, dry it completely and study visible cracks.
The floor to wall joint
Shrinkage cracks are scattered across the surface. We locate primary cracks, branches and corners with precision.
The condition of the old lining
The floor-to-wall joint is relatively stable in new construction, but moisture may separate concrete there.
Sediment and scale
The main pipe entry and branch openings are tightly sealed in modern construction, but shrinkage may leave small gaps.
The pipe entries
New lining covers all shrinkage cracks and damp concrete surfaces.
The hatch and the vent
The tank fills at normal speed after sealing because the structure is sound, and we expect no leaks if lining is applied correctly.
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 Al Sharai Sub-Municipality
Al Sharai is the eastern growth front of Makkah along King Faisal Road and the Taif road. Settled quarters sit beside recently renamed schemes where plots are still vacant and buildings are going up, so construction sites, fill and open excavations lie next to occupied homes. Wadi channels such as Wadi Mudarraja, Wadi Al Sharai and Wadi Al Mughammas carry flash floods after rain and dry out to damp silt, while dust blows off the open hills. Roadside shops, restaurants and warehouses line the Taif road, and to the east the area shades into villages, palm farms and springs.
Questions about this district
Why do cracks appear in brand new Tarwiyah tanks?
The concrete is very new and shrinks quickly. Moisture from Wadi Mudarraja increases shrinkage, and direct sun causes strong daily expansion.
Does wadi moisture speed up cracking?
Yes, clearly. Moisture increases shrinkage because concrete absorbs water from below while shrinking from above.
Can shrinkage cracking be prevented in a new tank?
Preventing it entirely is hard in new tanks, but it can be reduced by shading the tank or sealing it early.
How long should we wait before sealing a new tank in Tarwiyah?
Tarwiyah has high moisture so shrinkage is faster. We suggest sealing after six months to one year when primary shrinkage has stabilised.
Will new lining hold if more cracks form later?
The lining covers existing cracks but if shrinkage continues rapidly it may crack again.
Does sealing one tank in a building cover all tanks or does each need treatment?
Each tank needs separate treatment. Nearby tanks face the same weather but cracking varies by tank position.
How much does water tank sealing in Tarwiyah 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 Tarwiyah.
Nearby districts we cover
Other services in Tarwiyah
Other services we provide to residents of Tarwiyah.
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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 Tarwiyah? Tell us what you saw and we will tell you what it needs
We reach Tarwiyah at a time we agree, and you get the full cost before we start.