Core Drilling in Al-Ahsa – Tank, Pool & AC Duct Coring in Hofuf and Mubarraz

Core drilling in Al-Ahsa is a service we bring to Hofuf, Mubarraz and the farms and villages around them: using a diamond-bit core rig, we cut clean round holes through a house wall, the pump-room wall beside a rest-house pool, the side of a concrete farm water tank, or a wall just below the ceiling where a central-AC duct has to pass, without breaking out the concrete around the hole. Aemar Al-Maryam General Contracting works from Dammam, so for customers in Al-Ahsa we plan a single scheduled visit, load every bit size your list needs and finish the whole list in one trip. Small and AC holes start from SAR 90; all prices are estimates until we inspect and agree. Call or WhatsApp 0547879578.

Core requests in Al-Ahsa look different from those in the coastal cities. Here the rest house is part of family life, the farm has a tank, a pump and workers’ rooms, and a large house is often renovated in stages, gaining central air conditioning years after it was built with window units. That adds up to holes of every size in every kind of place: a new outlet for a tank, four pipes for a pool, a wide duct near a living-room ceiling. This page walks through each type, then explains how we price the work and how to prepare your list so that one visit is enough.

Core drilling in Al-Ahsa: where homes, rest houses and farms need it

Core drilling in Al-Ahsa is requested on four kinds of site, and each has its own wall thickness, access and pipe type. Knowing which one you have helps you write the list, and it helps us choose the equipment before we leave Dammam.

What these sites share is that the hole is rarely a job on its own. It is the step before the plumber, the AC technician or the pool technician can do their work. That is why we ask you to check the diameter with whoever will fit the pipe or duct before you message us: a hole in the wrong size means a second hole and a second bill.

Core drilling in Hofuf and Mubarraz

We treat Hofuf and Mubarraz as one work area. Moving between them changes neither the price nor the equipment, and one day’s schedule can include a Hofuf house in the morning and a Mubarraz rest house after it. What does vary is the type and age of the building, and that is the first thing we ask about.

Core drilling in Hofuf

Core drilling in Hofuf centres on houses being refurbished from the inside: a living room switching from scattered units to a central ducted system, or a kitchen moved to another side of the house that now needs a new extractor outlet and a new drain. In houses that have stood for many years we start by checking the wall both by eye and with the scanner. We may find thick plaster over block, a concrete wall added later, or old electrical runs that nobody recorded. That check decides whether we drill wet or dry and which side we start from.

Core drilling in Mubarraz

Core drilling in Mubarraz brings many requests from houses and villas still before finishing: drain holes through slabs before the gypsum ceiling goes up, AC holes before painting, and power and data holes between rooms. This is the best moment for coring, because water and slurry cannot spoil finishes that are not yet installed, and a hole is easier to reposition. If your house is at this stage, ask your contractor or engineer for the full hole list from the drawings and send it to us in one go.

Concrete coring in Al-Ahsa rest houses: pump rooms and pool pipework

Concrete coring in Al-Ahsa rest houses usually means opening paths for pipes between the pool and the pump-and-filter room. It comes up when a new pool is built at an existing rest house, when the pump room is moved, or when a new line is added for a fountain, lighting or heating. These holes go through reinforced concrete walls in most cases, so the rig is bolted to the wall on its stand; a hand-held machine is not the tool for them.

What we need to know before drilling pool holes

• How many pipes, and the size of each: suction, return, cleaning and any extra lines, as set by the pool technician or the supplier’s layout.
• The level of every hole: pool pipework relies on both gravity and pressure, and a hole that sits too high or too low complicates the run.
• Is the pool full? drilling a wall between the pump room and a full pool means lowering the water below the hole first.
• Where the power is: the pump-room panel and its cables, so we can keep water away from them and isolate them during the work if needed.

While drilling we collect the grey slurry with a wet vacuum as it forms and stop it reaching the pool water or the surrounding paving. Once the pool technician has run the pipes, the gap around each one is filled with a sealing material, because a wall that separates water from the pump room cannot tolerate even a small seep that slowly becomes a permanent damp patch.

Water tank core holes in Al-Ahsa: a new outlet that stays watertight

A water tank core hole in Al-Ahsa is one of the most specific jobs in the governorate. Concrete tanks on farms and rest houses sometimes need a new outlet for an extra pump, an inlet for a filling line, or an old outlet moved to a better level. The quality of the hole is judged not only by how cleanly it is drilled but by whether the outside of the wall stays dry once the tank is full again.

How we drill a tank wall, step by step

1. 1
   Empty the tank or lower the water
   The water is brought well below the hole, and the tank is emptied completely if the hole is near the floor.
2. 2
   Fix the level and diameter
   With the plumber or pump technician: pipe size, connector type, and height above the floor so the pump does not draw up sediment.
3. 3
   Scan for rebar
   Tank walls are usually reinforced with two meshes, so we locate the bars and pick a centre that passes between them where possible.
4. 4
   Drill from outside with a water-cooled diamond bit
   The rig is anchored to the outer face and drills steadily until the core comes out whole, keeping the edge of the hole sound.
5. 5
   Prepare the seal
   A sealing ring that swells on contact with water goes around the pipe, then non-shrink grout fills the space between pipe and concrete.
6. 6
   Inside finish and water test
   The inner edge of the hole is treated with the right waterproofing layer; after curing, the tank is filled and the outer face is watched.

This approach, a water-swelling ring plus non-shrink grout, is what sealant manufacturers’ installation guides describe for passing a new pipe through an existing concrete wall. If the tank needs a full internal lining rather than a seal around one hole, we agree that as part of our waterproofing service, and you can read about tank repairs on our renovation contractor in Al-Ahsa page.

AC core holes in Al-Ahsa

AC core holes in Al-Ahsa are the holes we are asked for most. The oasis summer is long, and many houses are moving from window units to split systems or to central air. The first rule is that the unit’s manual and the AC technician decide the diameter and slope; our job is to drill them precisely.

Split AC holes: diameter and slope

A well-known manufacturer’s installation manual asks for a 65 mm opening through the wall with a fall towards the exterior, so that condensate drains out rather than collecting inside the wall. We drill to the slope the technician asks for, choose a spot that avoids columns and beams, and break the core out on the outside carefully so the plaster edge does not spall.

Central-AC duct holes in Hofuf homes

When central air is added to an existing house, the duct has to cross interior walls close to the ceiling, and that makes the hole large: usually in the 8 inch or 10–12 inch class, depending on the round duct diameter the AC technician specifies. Drilling near the ceiling also means drilling near beams and lintels, so we trace the rebar and keep the hole clear of the beam. If there is genuinely no other position, the engineer decides.

A wide rectangular duct cannot be served by coring alone, because the bit is round. Either the technician switches to a round duct where it crosses the wall, or we open a rectangular hole with a diamond saw, which is covered on our concrete cutting in Al-Ahsa page.

Drilling holes in walls in Al-Ahsa: concrete, block or boundary wall

Drilling holes in walls in Al-Ahsa starts with a simple question: what is the wall made of? A reinforced concrete wall is cored wet on a stand-mounted rig. A block wall may be cored dry with dust extraction if water would harm an interior finish. A rest-house or farm boundary wall is usually block with concrete columns at intervals, so we place the hole between two columns.

When the opening you need is a door, a window or a large rectangle, it is not a coring job but a saw-cutting job, and we may use the core rig only to drill the corners before cutting.

Slab and ceiling coring in Al-Ahsa

Slab coring in Al-Ahsa is needed for drain and water pipes between floors, for roof ventilation outlets and for the services of rooftop annexes. We usually drill from above with the rig upright, and place something underneath to catch the core and the water so they do not land on the floor below.

• A 4 inch drain pipe: measures roughly 110 mm across the outside, which is why we core it at the 5 inch band: the extra gap takes the sealant.
• Holes through the roof: every pipe that crosses the roof needs a sealing collar tied into the waterproofing layer, or it becomes a path for rainwater and damp.
• Post-tensioned slabs: if the building has tensioned cables in its slabs, nothing is drilled until a radar scan has located them.
• Large or closely spaced holes: these are shown to an engineer first, because they reduce the slab section.

A slab that needs a square opening for a stair or a lift is a cutting job, not a coring one. For a fuller explanation of slab holes between floors, see our core drilling in Dammam guide, which covers ceiling cases in detail.

Kitchen and bathroom core holes in Al-Ahsa

Kitchen and bathroom core holes in Al-Ahsa come with kitchen refits and with new toilets added to majlis rooms and annexes. Household bathroom fans are typically sold for 100 mm ducting, which a 4 inch band hole accommodates; a kitchen hood often runs on a 150 mm duct, which means a 6 inch class hole. The final reference is always the fan or hood manual.

Core hole sizes in Al-Ahsa by use

Core hole sizes in Al-Ahsa are chosen from whatever pipe or duct goes through them, with a small margin added for sealing. The table below is a rough guide to help you describe your job; the final word belongs to the AC technician, plumber or pool technician.

Please note: treat these as opening estimates, firmed up once we have inspected and agreed, and they shift with how thick and how heavily reinforced the element is, which floor it is on, how easy it is to reach and how many holes there are.

Rebar scanning before coring in Al-Ahsa buildings

Rebar scanning before coring is a step we never skip, and in Al-Ahsa it matters even more: many rest-house and farm buildings were built without drawings that anyone kept, so nobody knows exactly where the bars are or where cables were run. We pass the scanner over the hole position and its surroundings, mark the bar pattern on the wall, then choose the centre that cuts the least steel possible.

• ✓Main bars: we avoid them by shifting the hole a few centimetres wherever the route allows.
• ✓Buried cables and pipes: we look for them before drilling and ask the owner about any run they know of.
• ✓Beams and columns: a column is never cored, and a beam only on an engineer’s written decision.
• ✓Post-tensioned slabs: no drilling until a radar scan has mapped the tensioned cables.

Core drilling prices in Al-Ahsa

Core drilling prices in Al-Ahsa begin at SAR 90 for an AC hole and anything of similar size, the same starting figures we use in Dammam, with the cost of travel and preparing the kit for the trip added when we price the job. We do not publish a fixed travel figure, because it is spread across the number and size of holes and the location of each site.

To be clear: everything in this table is a starting estimate confirmed after inspection and agreement. Travel from Dammam is included in the quote, and each hole’s share of it falls as the visit list grows.

What pushes the price up in Al-Ahsa?

• Wall or slab thickness: a tank wall or pool basin is thicker than a room wall.
• Rebar density, and how hard it is to avoid in walls with two meshes.
• Height and access, such as a duct hole near a high ceiling that needs a scaffold.
• Having to empty a tank or lower a pool before drilling.
• A single hole that carries the trip cost on its own.

How to keep the cost down

Gather every postponed hole on one list: the AC hole you are thinking about, the tank outlet you will need next summer, the drain the plumber plans to add. Book the work when the site is ready, which means before finishing in a house and after the water is lowered in a pool or tank. Our general price list is on the prices page.

One visit from Dammam to Al-Ahsa: how we prepare it

We are based in Dammam and Al-Ahsa is about 160 km away by road, so every Al-Ahsa request is handled as one planned trip. The aim is simple: to arrive once with every bit, every stand and every fitting we will need, so your list never stalls because one diameter was not in the van.

Core drilling or concrete cutting in Al-Ahsa: when do you need the saw?

Core drilling and concrete cutting complement each other. A core is enough as long as the hole is round and within what the bit can carry; a rectangular hole for a wide duct, a new door between two rooms or a stair opening in a slab all need the diamond saw. We often use both tools on the same site: core holes at the corners, then straight cuts between them.

If your Al-Ahsa list combines core holes with cutting a wall or slab, tell us from the start so we bring both sets of equipment on the same trip. The cutting side is explained on concrete cutting in Al-Ahsa and on our concrete cutting service page. Where the coring belongs to a bigger refurbishment, our renovation contractor in Al-Ahsa page explains how we organise renovation work.

Core drilling contractor in Al-Ahsa: what to check first

A core drilling contractor in Al-Ahsa should be judged by their answers before their price. Ask anyone you deal with these questions; we answer them before we ask you to confirm a date:

• ✓Do you scan for rebar before drilling? With what, and what happens if the marked centre sits right on a main bar?
• ✓Do you drill on a stand-mounted rig? Large holes and reinforced walls are not drilled with a hand-held drill.
• ✓How do you collect water and slurry? Especially next to a pool or inside an occupied house.
• ✓Is sealing round the pipe part of the price? Or only the drilling? We put that in writing in the agreement message.
• ✓How is travel priced? And does it fall if you add more holes to the visit?

Do not rely on phrases like “laser coring” or “thermal coring”. Real drilling in concrete is done with a diamond bit; a laser is only a tool for levelling and marking.

How to order core drilling in Al-Ahsa

1. 1
   Write the list
   one line per hole: location, purpose, diameter or pipe type, and floor.
2. 2
   Photograph every spot
   a close-up of the hole position and a wider shot of the whole wall or slab, with the spot marked.
3. 3
   Send it on WhatsApp
   to 0547879578 with your location pin and the days that suit you.
4. 4
   Receive the estimate
   we reply with the cost including travel and propose a date, possibly grouped with other Al-Ahsa jobs.
5. 5
   Confirm and prepare the site
   power, water, and the tank or pool lowered if needed.
6. 6
   Handover
   you check every hole with the team, and we note what was agreed on closing or sealing.

Why choose Aemar Al-Maryam to core in Al-Ahsa?

You can see examples of our work in the projects gallery and read the full details of our core drilling service.

Al-Ahsa districts we reach for core drilling

Among the Hofuf and Mubarraz districts where we drill core holes:

For farms and rest houses outside the districts, we need the map pin and the nearest landmark the driver will recognise. The Al-Ahsa area page gathers everything else we do in the governorate. If you also have work in Abqaiq, see core drilling in Abqaiq, as the two jobs may fit on one trip.