Construction of a garage measuring 6 by 10 meters is a large-scale project that requires a serious approach to the purchase of materials. Foam concrete blocks are one of the most popular options for the construction of such structures due to their low thermal conductivity and relatively low cost. However, in order not to overpay for extra cubic meters or, conversely, not to stop construction due to a lack of material, it is necessary to make an accurate calculation before starting work.
In this article, we will look in detail at how to calculate the required number of blocks, taking into account all the nuances, such as the thickness of the walls, the sizes of window openings and gates, as well as the influence of mortar joints on the final volume. You will learn why it is important to buy material in excess and how to correctly interpret supplier data.
Incorrect calculations can lead to significant financial losses or construction delays. Understanding the physics of the process and the geometry of the walls will help you optimize your budget and build reliable storage for your car.
Basic parameters and geometry of a 6x10 garage
Before starting calculations, it is necessary to clearly determine the dimensions of the future structure. A garage of 6 by 10 meters implies a perimeter equal to the sum of all sides: (6 + 10) × 2 = 32 linear meters. The standard wall height for comfortable use is usually from 2.5 to 3 meters, which allows you to install swing or sectional gates without additional difficulties with lifting.
The key parameter is the thickness of the walls. For an unheated garage in the southern regions, a wall of one block (200 mm) may be sufficient, while for a heated room or northern latitudes a masonry of two blocks (400 mm) or additional insulation will be required. Wall thickness directly affects the amount of material required, doubling its consumption when moving from 200 mm to 400 mm.
It is important to consider that the standard size of a foam block is most often 600×300×200 mm. However, manufacturers may offer other formats, for example, 625x300x200 mm. Exact dimensions For a specific product, you need to check with the supplier, since even a couple of centimeters of difference over a wall length of 10 meters will give a noticeable error in the calculations.
Mathematics of calculation: volumetric and piece methods
There are two main ways to determine how many foam blocks will be needed for construction. The first method is volumetric, it is more universal and allows you to quickly assess the total cubic capacity of the walls. The second is piece, which gives a more accurate idea of the number of units of goods, which is convenient when ordering transport.
For the volumetric method, we multiply the perimeter by the height and thickness of the wall. For example, with a perimeter of 32 m, a height of 3 m and a thickness of 0.2 m, we obtain: 32 × 3 × 0.2 = 19.2 cubic meters. This is the “dirty” volume from which the openings will need to be subtracted later. The piece method requires dividing the total area of the walls by the area of the side face of one block.
Always round the total number of blocks up. It’s better to leave a few pieces for future repairs or fences than to look for the missing ones in a week.
When using the piece method, it is important to remember mortar joint. If you do not take it into account, the calculation will be incorrect. The standard seam thickness is about 10 mm, but when using special aerated concrete adhesive it can be reduced to 2-3 mm, which also affects the final number of rows.
Accounting for window openings, gates and gables
No garage is complete without a gate, and often without windows for natural light. These elements occupy a significant area, which must be subtracted from the total volume of the masonry. A standard garage door with a width of 3 meters and a height of 2.2 meters covers an area of 6.6 square meters.
If you are planning to install a window, for example, 1.5 × 1.5 meters, this is another minus 2.25 square meters. The total area of deductions in our example will be almost 9 square meters. With a wall thickness of 200 mm, this is equivalent to almost 2 cubic meters of foam blocks, which is about 50-60 pieces.
⚠️ Attention: When calculating the gables (the triangular part of the wall under the roof), do not forget that their area depends on the angle of the roof. An error in calculating the height of the ridge will lead to an incorrect determination of the number of blocks in the upper rows.
Pediments are calculated as the area of the triangle: half the base multiplied by the height. For a garage with a width of 6 meters and a gable height of 1.5 meters, the area of one gable will be (6 × 1.5) / 2 = 4.5 sq.m. Since there are two pediments, we add another 9 square meters to the area of the walls, but without deducting the openings, since windows are rarely made in them.
Influence of seam thickness and type of binder
The choice of binding material - cement-sand mortar or special glue - significantly affects the geometry of the masonry and the consumption of blocks. Traditional mortar creates a thicker joint, which slightly increases the height of each row and therefore reduces the total number of rows for a fixed wall height.
Usage adhesive composition allows you to make seams with a thickness of only 2-3 mm. This not only improves the thermal insulation properties of the wall, eliminating cold bridges, but also makes the calculation more predictable. However, if the geometry of the blocks is far from ideal, a thin seam will not hide the defects, and a thicker layer will have to be used.
How does a seam affect the number of rows?
With a block height of 200 mm and a seam of 10 mm, the row height is 210 mm. A wall with a height of 3000 mm (3000 mm) will require 3000 / 210 ≈ 14.28, that is, 15 rows. If you use glue with a 2 mm seam, the row height is 202 mm, and you will need 3000 / 202 ≈ 14.85, that is, also 15 rows. The difference seems small, but at higher altitudes it adds up.
It is important to note that when ordering material, suppliers often use the concept of “cubic capacity”. One cubic meter contains a different number of blocks depending on their size. For a standard block 600x300x200 mm there are approximately 27.7 pieces in one cube. You cannot round up to 28 when ordering - it is better to take it down for reserve, that is, count 27 pieces per cube.
Table for calculating the number of blocks
For convenience, we present a table showing the dependence of the number of blocks on the thickness of the wall and the presence of openings. The data is given for a standard block of 600×300×200 mm and a wall height of 3 meters.
| Parameter | Wall 20 cm (without openings) | Wall 20 cm (with openings) | Wall 30 cm (without openings) |
|---|---|---|---|
| Masonry volume (m³) | 19.2 | 16.5 | 28.8 |
| Number of blocks (pcs) | 533 | 458 | 800 |
| Material weight (kg)* | ~6400 | ~5500 | ~9600 |
| Number of pallets** | 10 | 9 | 15 |
*Weight is approximate, based on the density of D600 (about 12 kg per block).
**The number of pallets is calculated based on standard packaging of 54-56 blocks per pallet.
As can be seen from the table, the transition to thicker walls or the presence of a large number of openings radically changes delivery logistics. Load capacity The manipulator should also be taken into account: one flight may not accommodate the entire volume if heavy, high-density blocks are selected.
Material stock and delivery logistics
Not a single professional builder orders material “back to back.” Breaks during transportation, chips during unloading and cutting of blocks in corners or at openings are inevitable losses. Typically, 5% to 10% of the reserve is added to the calculated quantity.
For a garage 6 by 10 meters, where the total number of blocks is in the hundreds, 5% of the stock is about 25-40 blocks. This will slightly increase the cost, but will protect the crew from downtime. In addition, the killing material can be used for backfilling or construction of internal partitions.
☑️ Check before ordering
⚠️ Attention: When delivering on a long vehicle (truck, 20-ton), make sure that the unloading area can support the weight of the vehicle. It often happens that the manipulator cannot get close and requires manual carrying, which increases the risk of combat.
Logistics also depends on packaging. Foam blocks are often supplied on pallets packed in shrink film. The film must be removed carefully so as not to damage the corners of the blocks, which are the most vulnerable point during transportation.
Frequently asked questions (FAQ)
How many foam blocks are in one cubic meter with a size of 600x300x200 mm?
One cubic meter contains approximately 27.78 blocks of this size. When making calculations, it is customary to use the number 27 or 27.7 so as not to go into minus. Rounding to 28 may result in a few cubes of material missing.
Is it necessary to subtract the volume of the armored belt from the calculation?
Technically, the armored belt is made of concrete and reinforcement, taking the place of foam blocks. However, taking into account calculation errors, damage and trimming, many builders do not deduct the volume of the armored belt, leaving these blocks as safety stock. If you want maximum accuracy, subtract the volume of the armored belt (usually one row of blocks around the perimeter).
Is it possible to use blocks from different manufacturers in the same masonry?
Highly not recommended. Blocks from different factories may have differences in geometry (difference of several millimeters) and color. This will lead to different thicknesses of the seams, which will worsen the thermal insulation and appearance of the wall, as well as complicate the masonry process.
How does the humidity of foam blocks affect the calculation?
Humidity affects weight, but not volume. However, a wet block is heavier, which is important for calculating the foundation and transport load. Dry blocks are lighter but more fragile. When calculating the number of pieces, moisture is not taken into account, only the geometric size is taken into account.
The optimal strategy is to order the main volume with a reserve of 5-7% in one batch from one manufacturer to ensure uniformity of the material and avoid logistics problems.