Cutting a doorway in various wall materials

Redevelopment of an apartment is a good reason to change the location, overall size of the door, or dismantle the partition.

Any operations related to redevelopment must be pre-coordinated with government agencies and obtain permission to carry out work.

If you need to cut through a doorway, first carry out calculations and design work, and also do not forget about installing support posts to increase the strength of the floors.

How to calculate a doorway

The location and overall dimensions of the doorway will directly depend on the number and size of windows. The area of ​​window openings that provide natural light to the room should be related to the floor area in a ratio of 1 to 5.5. The number 5.5 can be increased to a maximum of 8. Since the windows are already installed, in order to change the ratio, the overall size of the doorway is adjusted.

Vladimir Baranov (door installation specialist 169.ru) In order for the new opening to meet ergonomic requirements, GOST standards should be studied. The height of the doorway should be at least 2 meters

Width:

• For living rooms from 70 to 80 centimeters
• For a bathroom 60 centimeters
• For entrance doors at least 90 centimeters

If the room has high ceilings, then deviations from the standards are acceptable, but in this case the changes must be agreed upon in advance with the BTI.

Approximate prices

The cost of diamond cutting of concrete in Russia varies between 800-12,000 rubles per linear meter. Approximate prices for such work are shown in the table.

Approximate prices for diamond cutting of concrete in capital companies are given below:

• SLOM24 – 800-8000 rubles per linear meter.
• Almaz Best – 800-10,000 rub/sq.m.
• Special dismantling service - 1000-10000 rubles/p.m.
• Gimlet - from 900 to 6000 rubles per linear meter.
• ASTAT – from 1000 to 8000 rubles/l.m.

Cutting methods and tools

It will come as no surprise to anyone that you will need a set of tools for cutting. To understand what names will be needed, you first need to decide on the method by which cutting will be carried out.

It is a mistaken belief that a hammer drill and sledgehammer are a universal tool that allows you to make a passage in any wall. Such an approach will lead, at a minimum, to general damage to the entire partition, and possibly to its partial or complete collapse.

It is possible to cut a doorway without damaging the partition using diamond, laser, waterjet and oxygen cutting. Let's consider each method separately.

Our services in Moscow and the region.

Use of hand tools (220V)

• Expansion of openings
• Cutting in partitions and load-bearing walls of openings, thickness 22 cm.
• Holes in concrete

Application of hydraulic tools (380V)

• Dismantling of floors and foundations
• Construction of openings more than 22 cm thick.
• Diamond cutting with a joint cutter

The process itself can be represented as follows: on the disk there are special segments that consist of diamond chips and a binder, the binder material is worn out during the cutting process, and new diamond edges are opened. In a chain saw, a chain is used instead of a disk, in a cable saw, respectively, a rope. Despite such a beautiful name, this work itself is dirty (if water is used) and dusty (without water) and relates mainly to capital construction.

Where is diamond cutting needed?

It is mainly used for redevelopment of premises and on construction sites.

1. Dismantling of floor slabs
2. Diamond cutting of openings in walls
3. Dismantling of reinforced concrete structures

Diamond cutting

Its essence lies in the use of a diamond-coated cutting disc for a circular saw or grinder.

Advantages of diamond cutting:

• There is no vibration during work, and the partition is not destroyed as a result of cracks
• The cut is thin and neat, thanks to which it is possible to avoid the appearance of a large amount of debris during construction work.

Cons of diamond cutting:

• The high cost of diamond-coated cutting tools and their high consumption.
• When using a circular saw, a large amount of fine dust rises into the air. Wetting the surface to be cut with water can only partially solve the problem.

Cutting with diamond tools

Factors influencing price

The cost of diamond cutting of concrete can vary. The price level is influenced by the following factors:

1. The type of structure to be worked with (its dimensions, thickness).
2. Method of cutting concrete.
3. Type of apparatus used.
4. Urgency of order fulfillment.
5. Reinforcement of concrete.
6. Complexity, amount of work.
7. Performer type.
8. City of service provision.
9. Contractor's pricing policy.

Laser cutting

Until recently, laser equipment capable of cutting building materials had an impressive weight and size. The development of mechanical engineering technologies has made it possible to create portable equipment that can be used not only in a factory, but also in an apartment.

The material is cut using a laser beam.

The benefits include:

• No noise during work
• The partition around the future opening is not destroyed during the work process
• High cutting precision

Disadvantages include:

• High cost of equipment
• High power consumption
• As a consequence, the high cost of the work carried out.

Laser cutting

Dismantling works.

See more details

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When performing dismantling work, they use the services

cutting walls, cutting floors, drilling holes, garbage removal

Also looking for

cutting openings, gating walls, cutting asphalt, metal reinforcement

SEE US:

Dismantling and waste removal services are paid separately

See the cost of dismantling work

Waterjet cutting

A special installation is used that creates a powerful pressure of water mixed with an abrasive mixture (for example, sand). Through the nozzle the jet is supplied to the wall. The water pressure is so high that in addition to concrete, the jet also cuts steel structures located inside the wall.

Advantages:

• Due to the fact that the wall is wetted during cutting, dust does not rise into the air.
• The wall is not affected by vibration
• The cut is precise and neat, curved cutting at any angle is possible
• Low noise level

Flaws:

• Can only be used on construction sites that have not been put into operation
• Larger equipment dimensions

Waterjet cutting

Why are our prices below average?

3. Two main reasons due to which we offer the most optimal prices for the customer.

First: a simple calculation based on statistics. After 10 years of cutting, drilling and drilling concrete in the Moscow region, 3/4 of the total number of our customers come to us on recommendations from former clients. Competitors are surprised why we work on 3 orders for cutting or drilling concrete, when they only complete one for the same price. The answer is simple: after some time, quality work done at the optimal price for the client will bring us an order based on recommendation. Given that advertising costs will be zero. Second: we do not work with intermediaries and do not pay for the maintenance of the office and management. All organizational and financial issues are resolved directly between us, the performers of the work, and the customer.

Oxygen cutting

A device with a metal tube is used. The tube heats up to 2000 degrees Celsius. The heating effect is achieved by supplying oxygen through a gas burner and under high pressure.

The main disadvantage is considered to be an increased fire hazard and the risk of burns during work.

Just like waterjet cutting, oxygen cutting is carried out only on those objects that have not yet been put into operation.

Oxygen cutting

Diamond drilling of concrete with Hilti bits.

5. Diamond drilling with a Hilti DD-350 unit and original bits DD-BL 35/430, DD-BI 52/430 allows you to cut holes in a monolith in exact accordance with the specified parameters. The Hilti DD-350 diamond drilling rig and the more recent version DD-500 are rightfully one of the best units for drilling and cutting highly reinforced monoliths with a density from 2150 to 2900 kg/m3. The maximum thickness of the concrete structure, where it was possible to drill a hole with a diameter of 200 mm, was 5400 millimeters of reinforced concrete. Standard Hilti bits are not suitable for working on such a monolith horizon. You need to order individual crowns from a manufacturing plant in Europe, Liechtenstein.

Cutting in concrete

• It is carried out according to pre-applied markings.
• Markings are applied on both sides of the partition
• Using a long drill, the partition is drilled through the corners of the future opening.
• Similar holes are drilled around the entire perimeter of the door in increments of no more than 50mm, marking the outline
• Next, the concrete panel inside the outlined contour is cut into pieces using a circular saw and dismantled

Cutting in brickwork

• The top of the future doorway must coincide with the concrete seam. Cutting bricks is strictly prohibited. This will significantly weaken the entire partition and may lead to cracks or collapse.
• The row of bricks located above the top point of the doorway is dismantled and replaced with a beam or block exceeding the width of the doorway
• Only after all the above operations do they begin to dismantle the masonry inside the future opening.

Types of openings

There is a classification according to shape: classic, original or rectangular. Over the past few years, it has become common to make arches in houses and apartments. They look non-standard and help to beautifully decorate the doorway. Arches are used for apartments in which it is quite narrow. There are several types of projects:

1. With a gentle curve. It helps make the arch quite wide, and the corner radius visually higher.
2. Classic version with a radius. Suitable for rooms with high ceilings.
3. In the shape of an ellipse, trapezoid.

Often, residents of apartments and houses choose non-standard shapes that can fit into any interior and style. It is necessary to take into account the ceiling height and the required width.

Opening with a gentle curve

Classic Standard Look

Non-standard type

Cutting in a wooden partition

Cutting a doorway in a wooden partition is carried out using a chainsaw, after preliminary strengthening the wall with wooden blocks on both sides.

The bars on opposite sides of the wall are pulled together with anchor bolts. After strengthening the wall, they begin cutting out the doorway with a chainsaw.

Vladimir Baranov (door installation specialist 169.ru)

After you remove the old coating, you may be in for an unpleasant surprise in the form of dark spots. They can be bleached with chlorine. Dilute it with water in a ratio of 1 to 3.