Well designed and built foundation guarantees a long service life any building or structure. Today there are several popular types of bases, but the most popular of all is certainly the tape. To create it, special equipment is not required, and the installation technology is as simple as two fingers - everyone is able to build a strip foundation with their own hands.
Service site offers you to perform strip foundation calculation using an online calculator. It is designed to calculate the amount and volume of materials, select the optimal thickness of the tape, determine the permissible load on the ground, and much more. For clarity, the program displays dynamic drawings and a 3D model, which change depending on the selected parameters and specified values.
The calculator allows you to calculate MZLF, standard or recessed foundation monolithic type - the calculation method in all cases is no different. For the convenience of users, the program algorithm includes the calculation of reinforcement and the calculation of concrete for a strip foundation. Formwork will be added soon.
Instruction
Our service allows you to calculate the strip foundation for the house as accurately as possible, however, the reliability of these calculations directly depends on what parameters you fill in the calculator fields. Especially to avoid such misunderstandings, it was recorded instructional video with a detailed explanation of all elements of the strip foundation calculator and the quantities used. See the instructions and ask your questions in the comments if clarification is required.
For those who do not have the opportunity to watch the video with sound or have problems with video playback, we have prepared a shortened text version of the strip foundation calculation example on our service. Read just below.
Fill in the fields of the calculator CAREFULLY, since any, even a minor mistake can cost time and money spent.
Interface Overview
The interface of the strip foundation calculation calculator should be intuitive to most users, as it is quite simple.
The main part of the program is divided into several major elements:
- An introductory block with initial data and a simplified diagram.
- A detailed drawing of the strip foundation, which is drawn based on the first paragraph.
- An interactive 3D model that allows you to view all structural elements in three-dimensional space.
- Calculation results (materials, quantities, allowable values…).
Also under the calculator itself, there is a little help in which formats the download is available, how to save the result, send it by e-mail or add it to bookmarks.
Scheme
Based on the plan of your house, you begin to visualize the device of a monolithic strip foundation. Using the configurator, set the required number of tapes and their location.
The service limits the maximum possible number of horizontal and vertical axes. You can set no more than 2 additional lines for each direction, i.e. no more than 8 axles in total.
In order to add parallel horizontal (alphabetic) axes, select the required number (1 or 2) in the first item AD0. The new lines will be located between the AD axes and will be called B and C.
Vertical axes (numeric) are not added to the entire length of the strip foundation, but specifically to each section AB, BC or CD.
To offset a section, fill in the Side Offset field. See the practical example below for more on this.
Example 1
In order to get a square monolithic strip foundation for a house, divided into 9 equal blocks, you need:
- add two axes in item BC0;
- add two axes in paragraph CD0.
Example 2
You have a non-standard foundation, which is divided into 6 unequal sections. The AB block is broken into three parts, the BC block into two parts, and the CD is not broken.
- add two axes in item AD0;
- add two axes in paragraph AB0;
- add one axis in item BC0;
- leave zero in item CD0.
Thus, "playing" with the values, you can make a schematic drawing of the foundation with any kind of sections. Also, for your convenience, it is possible to rotate the drawing (by 90, 180 or 270 degrees), choose its color, turn on the grid and whether to show guide lines.
Foundation characteristics
Now we need to specify the dimensions of the sides, the width of the tape, the height and depth of the strip foundation, as well as the brand of concrete used.
Filling in the fields with the dimensions of the sides should not cause difficulties - everything is clearly illustrated in the drawing of the strip foundation.
Tape height calculated individually, depending on your preferences, the height of the plinth or for other reasons. The standard size is 40-50 cm.
A bit of theory. The construction of a strip foundation on heavily heaving soils with a high level of groundwater is possible only if the strip is deepened by 30 or more centimeters below the freezing level, i.e. you will get a recessed base. In this case, the frost heaving forces act not vertically, but tangentially, thereby significantly reducing the destructive effect. For all other situations, when the soil is not subject to strong heaving, it makes sense to use a shallow (non-buried) strip foundation, as the most profitable and easy to install.
Tape width is selected based on the type of underlying soil on which construction is intended and the mass of the overlying structure. The point is to strike a balance between the pressure of the structure on the ground and the maximum allowable pressure that the ground can withstand. For most cases in private construction, the rule is that the width of the tape should be 10 cm more than the thickness of the wall. However, if the calculator gives you a warning that these values are not valid for you, use the recommended value that it offers you.
Calculation of concrete on a strip foundation - Calculator
For the construction of the base, it is recommended to use only high-strength concrete mortars brand M300 and above. The use of a mixture of lower strength can lead to deformations and destruction of the structure - saving money on cheaper materials is inappropriate in this case. Fill in the appropriate fields in the calculator to perform a reliable concrete calculation.
You can perform an approximate calculation of the load on the strip foundation based on the mass of the box at home, using a special building block calculator. For a more accurate value, add 10-15% to account for roof weight, snow and wind loads. On the foundation soil resistance calculation page, find out the maximum allowable load on the underlying surface.
bedding
Foundation filling ensures the reliability and durability of the entire structure of the house as a whole. In most cases, a pillow made of sand, gravel or ASG is used. Our default calculator assumes that you will be using sand. Depending on the type of soil, the thickness of the cushion should be from 30 to 60 cm.
Calculation of reinforcement for a strip foundation
Creating a reliable foundation is impossible without making a high-quality reinforcing cage, so it is important to correctly calculate the reinforcement for the strip foundation. Select the expected bar diameter, the number of horizontal rows, bars, and the spacing between vertical rows. If you plan to deepen the reinforcement into the ground, indicate this in the appropriate field.
If you do not know or are not sure how to properly knit reinforcement for a strip foundation, you should refer to certain standards, which are set out in SNiP 52-01-2003 (SP 63.13330.2010) in particular, special attention should be paid to the paragraph "Design requirements":
- clause 7.3.4 - the minimum distance between the reinforcement bars should be taken depending on the diameter of the reinforcement, but not less than 25 mm;
- clause 7.3.6 - the distance between the rods of longitudinal reinforcement should be taken no more than twice the height of the section of the element and no more than 400 mm, and the greater the load on the base, the less it will be, but not less than 100 mm;
- clause 7.3.7 - transverse reinforcement should be installed in increments of not more than half the working height of the element section and not more than 300 mm.
By following these rules, you can be sure that you are doing the correct laying of the reinforcement in the strip foundation. These rules apply to private construction, but for more complex structures, there are certain amendments and notes that you need to read in more detail.
You can also check the box to draw the reinforcement on the 3D model. In this case, the calculation of the program may take up to 5 minutes, depending on the performance of your device. Even if the browser prompts to close the page, wait for the end of the operation!
Monolithic slab on a strip foundation
A strip foundation with a monolithic floor slab is an excellent solution if you want to protect your home from pests (rodents, insects), and you are also afraid of premature destruction of the wooden floor due to high humidity, or deformation of the floor when concrete is poured into separate cells between the tapes. Concrete flooring is perfect for both light houses made of foam blocks and aerated concrete, and heavy houses made of brick and stone.
Indicate in the program the desired thickness of the slab, the side of the reinforcing mesh (the side of a square cell), the diameter of the reinforcement and the grade of concrete (M200 or more).
As soon as you fill in the entire field, click the "Calculate" button!
After the calculator makes the necessary calculations, a drawing of the foundation and a three-dimensional model of the structure will be available to you.
Plan- this is a top view of your base with linear dimensions. This is your main guideline during construction, it allows you to get a clear idea in a simplified form of what is required of you and what you should strive for.
View in 3D clearly demonstrates the appearance of the future foundation. Visualization helps to evaluate the project in real proportions, see the pros and cons of the proposed design and make the final decision - is this what you need or not. You can see the surface of the earth on it, a sand cushion, of course, the foundation itself and the laying of reinforcement. All elements are interactive and are built based on the specified data.
Calculation results
Our service calculates all the necessary parameters that can be used in the construction of the foundation. Let's consider some of them in more detail.
Foundation
The pressure of the foundation on the base of the soil should not exceed the maximum allowable.
If the width of the foundation tape was chosen incorrectly, the result will be highlighted in red. This means that the structure of the building is too massive and the tape will cut through the ground until it hits an obstacle. If you have entered everything correctly, you will see green backlight.
According to SP 52-101-2003, the percentage ratio of the cross-sectional area of the longitudinal reinforcement to the cross-section of the foundation slab ( reinforcement ratio) for concrete structures, should be not less than 0.025%. If your value is less than the norm, it is worth increasing the number of vertical and horizontal rows.
materials
This block displays all the materials and their quantity (dimensional values) that will be required during the construction of the strip foundation and related elements. For example, you can find out:
- volume and mass of foundation concrete;
- the total length of the reinforcement bars and their number;
- how much knitting wire is required;
- what is required for casting a monolithic slab onto a tape;
- how much sand you need to order for the foundation and for the concrete screed;
The rest of the elements can be found directly in the interface itself.
Calculation of the strip foundation - Example
Background theoretical information helps to understand some controversial points, but everything becomes much clearer when you analyze the real practical situation.
We chose a random scheme of a one-story house from the Internet and, based on it, performed the calculation of the strip foundation on our calculator. All initial conditions are presented in the image. The lengths of the sides are indicated in millimeters, but for convenience we will write in centimeters.
Let's build a simplified scheme using the "Orientation" block.
Let's transfer all the dimensions from the figure to the calculator and assume that the width of the tape will be 40 cm.
In order to get the indentation on the left for the "Kitchen-living room", you need to move the side of the CD to the right. We fill in the size of the side and look at the length of the terrace, it is equal to 300 cm (3000 mm), so you need to enter 300 cm in the "CD side offset" field.
As we can see, the lower room is a little crooked, and the dimensions are not at all what we indicated in the condition.
Firstly, this is due to the fact that in the diagram that we are repeating, the length of the side of the room with the wall is equal to the length of the side without the wall, which in itself is at the root wrong.
Secondly, note that in the strip footing calculator, the count on the sides starts not from the edges of the tape, but from the internal axes of symmetry.
The calculator supports entering NEGATIVE values in the Side Offset field. Axis 1 is taken as zero. This is necessary so that you can create a strip foundation of arbitrary shape.
Now you know how to calculate the strip foundation for a house on our calculator correctly. Please note that the highlighted items must be highlighted in green otherwise the foundation will be extremely unstable.
First of all, the base may not withstand the load of the overlying building structure and soon the tape will deform. In the second case, if the tape is not wide enough, the structure will begin to go deep into the ground until one of its parts rests against denser rocks and, then, due to the uneven distribution of pressure, the foundation will simply break.
We hope that the instructions for working with the strip foundation calculator were useful to you. If you have any questions, comments or suggestions about the service, please contact us in any way possible.
Specify the required dimensions in millimeters
X- foundation width
Y- foundation length
A- foundation thickness
H- foundation height
C- distance to the jumper axis
A- foundation thickness
H- foundation height
S- step between connections
G- horizontal rows
V- vertical rods
Z- connecting rods
The required amount of cement for the manufacture of one cubic meter of concrete is different in each case.
It depends on the grade of cement, the desired grade of the resulting concrete, the size and proportions of the fillers.
Indicated in bags.
It is not worth repeating how important it is when designing a house to calculate the amount of building materials for the foundation of the house.
After all, the cost of a monolithic foundation reaches a third of the cost of a house.
This service will facilitate the planning and calculation of the foundation of the house. It will help to calculate the amount of concrete, reinforcement, formwork boards for strip foundations.
What can you find out:
The area of the base of the foundation (for example, to determine the amount of waterproofing to cover the finished foundation)
The amount of concrete for the foundation and floor slabs or pouring the basement floor (it will be fun when, due to an elementary error in multiplication, there is not enough concrete)
Rebar - quantity of rebar, automatic calculation of its weight based on its length and diameter
Formwork area and amount of lumber in cubic meters and in pieces
The area of all surfaces (for calculating the waterproofing of the foundation) and the side surfaces and the base
Added calculation of the cost of foundation building materials.
The program will also draw a drawing of the foundation.
I hope that the service will be useful to those who build the foundation with their own hands and to professional builders.
concrete composition
The proportions and amount of cement, sand and gravel for the preparation of concrete by default are given for reference, as recommended by cement manufacturers.As well as the price of cement, sand, gravel.
However, the composition of the finished concrete is highly dependent on the size of the fractions of crushed stone or gravel, the brand of cement, its freshness and storage conditions. It is known that during long-term storage, cement loses its properties, and at high humidity, the quality of cement deteriorates faster.
Please note that the cost of sand and gravel is indicated in the program for 1 ton. Suppliers also announce the price per cubic meter of sand, crushed stone or gravel.
The specific gravity of sand depends on its origin. For example, river sand is heavier than quarry sand.
1 cubic meter of sand weighs 1200-1700 kg, on average - 1500 kg.
Gravel and crushed stone are more difficult. According to various sources, the weight of 1 cubic meter is from 1200 to 2500 kg, depending on the size. Heavier - smaller.
So you will have to recalculate the price per ton of sand and gravel on your own or check with the sellers.
However, the calculation will still help to find out the approximate costs of building materials for pouring the foundation. Do not forget the wire for tying reinforcement, nails or self-tapping screws for formwork, the delivery of building materials, the cost of earthwork and construction work.
Note: the exact calculation of concrete is carried out for dry sand and gravel, if they are moistened, then the volume of water will be different. Here already you need to experiment with the volume of water.
Foundation base width BUT- depends on the weight of the building, the strength characteristics of the soil under the building, etc. It is recommended to accept according to the results of calculations.
The width of the roof must be increased.
H is the height of the foundation. Depends on the degree of subsidence of soils (the more subsidence of soils, the higher)
HC- the height of the foundation (basement) above ground level. The required formwork area depends on it. Exceeding the level should not be less than 200 mm.
Deepening the foundation into the soil subject to frost heaving (loam, clay) should not be less than the depth of soil freezing in the given region. The depth should be no less than the thickness of the vegetative layer of soil (30-50 cm)
In underground soils, the trench walls are unstable and will crumble.
Horizontal rows of reinforcement are arranged from "working" reinforcement with a diameter of more than 10 mm, and vertical rows - from "constructive" reinforcement with a diameter of 8-10 mm of a smooth or periodic section.
The step of vertical reinforcement is taken from the conditions of non-sagging working reinforcement of the upper row.
It is forbidden to insert vertical reinforcement into the ground or install it on pieces of rubble and other improvised objects. The reinforcing cage must either be suspended or mounted on specially made concrete support cubes.
The distance between the ends of the reinforcement must be at least 15 mm.
Since the strip foundation under the house is a closed contour of reinforced concrete beams, erected under all the load-bearing walls of the house, choose one of the proposed eight standard foundation options based on how many load-bearing walls are planned in the house.
Option No. 1 is relevant if construction is planned without internal supporting walls, No. 2, if an internal supporting wall is needed, options No. 3-8, if more load-bearing walls are needed in the house.
Fill in the dimensions in millimeters:
X- The width of the foundation depends on your wishes and the possibility of building on the site. Parameter value X take more than the width of the walls (i.e., the distance between the outer planes of the walls) by about 100 mm on each side for the possibility of finishing. When choosing an option X SP 50-101-2004 "Design and installation of bases and foundations of buildings and structures" should be taken into account.
A shallow strip foundation is suitable for all types of soils except subsidence, peatlands and water-saturated soils. And often it is optimal for frame, timber houses, as well as bricks.
Y- the length of the strip foundation, determined by the length of the house.
H- The height of the foundation depends on the depth of the foundation (shallow from 0.3-1 m, buried up to 2-3 m) and elevation above ground level. The foundation must be made below the freezing line and above the groundwater level. If it is not planned to equip auxiliary premises in the basement, then a height of about 150-300 mm above ground level is sufficient, and if the base is used, more. The value of the height of the strip foundation H taken from 0.3 m for light houses and reaches about 4 m for heavy stone ones. The key to a reliable foundation is an individual project that takes into account the characteristics of the soil on the site; the height of groundwater; depth of soil freezing in your region; the weight of the house (i.e. the load on the foundation from the weight of the walls, floors and roofs).
A is the thickness of the foundation strip, i.e. the distance between the outer and inner plane of the foundation depends on the thickness of the walls being built (it is taken more by 100-150 mm). Approximate values of the thickness of the strip foundation for outbuildings (barn, bathhouse, garage) are in the range of 250-400 mm; for a 1-storey light (for example, frame) house 300-650 mm; A 2-storey brick house is being built on a foundation with a thickness of 650-750 mm.
FROM- the center distance between the foundation lintels (relevant for options No. 2-No. 8) depends on the features of your project.
Armature parameters:
G– Number of horizontal reinforcing rows, for a strip foundation G=2. It may be more depending on the magnitude of the acting loads. It is recommended that you familiarize yourself with SP 63.13330.2012. The capabilities of the online calculator allow you to calculate up to 10 rows of reinforcement.
V- The number of vertical rods connecting the reinforcing belts can be from 1 to 5.
Z– The number of connecting rods is accepted from 1 to 5.
S– Pitch length is the distance between adjacent vertical reinforcing straps. Optimal value S 300-500 mm.
Weight 1 m of reinforcement depends on its diameter. The approximate weight of one meter of different diameters of iron reinforcement is given in the table.
| Diameter reinforcement, mm |
Weight of 1 running meter of fittings, kg |
| 6 | 0,222 |
| 8 | 0,395 |
| 10 | 0,617 |
| 12 | 0,888 |
| 14 | 1,21 |
| 16 | 1,58 |
| 18 | 2 |
| 20 | 2,47 |
| 22 | 2,98 |
| 25 | 3,85 |
| 28 | 4,83 |
| 32 | 6,31 |
Formwork parameters:
board in thickness for formwork assembly, from 25 mm to 50 mm is taken from the calculation, the thicker the better (but also more expensive).
Board length. This parameter is usually chosen in the order of 4000-6000 mm, depending on the availability of lumber in the warehouse and the price of the formwork board.
Board wide. For the manufacture of formwork, an edged board is used (it is possible from 1 side) with a width of 100-200 mm.
Formwork installation requires care and responsible attitude of the performers in order to ensure the correct geometry of the future foundation.
It is important to reinforce the assembled formwork with wire so that it does not disperse from the weight of the concrete, cover it from the inside with plastic wrap, this will prevent concrete leakage and make it possible to reuse the boards for construction purposes.
Concrete composition parameters:
Bag weight, kg– here enter how much 1 bag of cement weighs in kilograms.
Proportions of concrete by weight. The approximate ratio of components for a concrete mixture is 2-3 parts of sand for 1 part of cement, crushed stone - 4-5 parts, water - 1/2 part (the mixture should be plastic and not too liquid). However, depending on the required brand of concrete, the brand of cement used, the characteristics of sand, crushed stone, the use of plasticizers or additives, the proportions may vary. Typical consumption rates of cement for the preparation of prefabricated and monolithic concrete, reinforced concrete products and structures are regulated by SNiP 5.01.23-83.
Enter prices for building materials: cement (per bag), sand (per 1 ton), board (per 1 cubic meter) and rebar (per 1 ton).
This construction calculator will perform:
- calculation of the area of \u200b\u200bthe base of the strip foundation and the required volume of concrete for pouring it;
- calculation of the formwork area (i.e., the area of the side surfaces) and the required amount of lumber for the formwork of the strip foundation and their price (if the height of the slab is not a multiple of the height of the board, then the number of boards is calculated taking into account the overlap of the entire height of the slab);
- calculation of the number of bags of cement, tons of sand and gravel for strip foundations and the cost of these components of concrete for pouring;
- calculation of the required reinforcement of the strip foundation, namely the number of horizontal, vertical and connecting rows of reinforcement, its length, weight and cost of the reinforcement.
The calculator will also calculate the final cost of building a strip foundation, which will give an idea of the level of material investment in the foundation of your home and allow you to make an informed decision on the appropriateness of this type of foundation. You can also calculate other options for foundations using our calculators and choose the best solution.
Calculation of the price of the foundation for the house. Online foundation calculator. Calculate the cost of the foundation under the house calculator. Foundation cost calculator.
STEP 1. In the gray field on the left, specify the type of soil on the site - this parameter determines the list of recommended foundation structures.
STEP 2. Then select the material of the walls of the future house, indicating its thickness. Depending on the wall thickness of the future house, those foundation designs will be selected that are reliable enough to withstand the planned load.
STEP 3. For strip foundations, specify the perimeter of the foundation, including internal lintels in linear meters. For slab foundations, specify the area in square meters for the correct calculation of the foundation price.
STEP 4. Select the warranty period you require.
When calculating, you will see a list of foundations recommended for your site and house, indicating the price of the foundation. The price of the foundation calculated by the calculator is approximate, it will be specified when placing an order.
Strip foundation - a prefabricated or monolithic base of high-strength reinforced concrete blocks, which are laid along the perimeter of the future structure, as well as in the areas of load-bearing structures. The formation of a strip foundation does not involve the involvement of heavy construction equipment, but it requires absolute accuracy of calculation and measurement operations. An interactive strip foundation calculator will allow you to quickly and accurately calculate the proportion of sand, cement and crushed stone in the manufacture of concrete manually, the dimensions of the strip, as well as the parameters of the formwork and foundation reinforcement for a house made of foam concrete or aerated concrete.
Benefits of an online strip foundation calculator
- Saves time, nerves, effort and money in the preparation of estimates for the purchase of building materials.
- Allows you to evaluate the volume of creative actions, as well as to predict the timing of the formation of a tape-type foundation.
- A competent calculation of the parameters of reinforcement and concrete guarantees high strength and reliability of the internal frame of the structure.
- The ability to instantly calculate the parameters for a monolithic or prefabricated, shallow or deeply laid foundation of a tape type.
- The 2D and 3D visualization options allow you to visually assess the adequacy of the calculation manipulations and make the necessary corrections in a timely manner.
Tasks that the calculator solves
The calculation of reinforcement for a strip foundation helps to determine the total length and weight of the reinforcement cage, as well as the minimum diameter of the transverse and longitudinal bars, the number of rows in the reinforcement belts, the spacing of the clamps and the amount of overlap. Calculations are made in accordance with the rules of SP 52-101-2003.
The calculation of concrete for a strip foundation provides information on the proportions of sand, crushed stone and cement, as well as the weight of the main building material for pouring a strip foundation. The results of the calculations allow competently and competently to distribute the load on the segments of the structure.
The formwork calculation specifies the total length of the perimeter, as well as the area of the sole and the outer side face of the reinforced concrete strip.
The online calculator for calculating the strip foundation works for you completely free of charge. For any question, write a little below in the comments - we will definitely help you.
