It is possible to attach the veranda to the house faster and easier if you use a screw pile foundation during the construction process. The rods are ideal for small structures, but you should take into account some of the nuances of their installation. You can build a porch on screw piles with your own hands, saving the family budget.

The benefits of building a porch on stilts

A helical rod is a hollow metal pipe that has a spiral part on one side and a flat end face on the other. The pipe is hollow inside, because the concrete mixture is poured inside. When the metal is damaged by corrosion, the hardened cement continues to carry load-bearing functions.

• Arrangement of a veranda on a pile-screw foundation has its advantages:
• Cost. Costs with this type of base are minimal. For its installation does not need expensive construction equipment, and there is no need for land work.
• Accuracy. The landscape, green spaces standing next to the building are completely preserved.
• Speed. Installation of a screw foundation takes a little time, usually no more than two days.
• Quality. With proper installation, the veranda will last a long time. The main thing is to correctly calculate the parameters and consumption of materials.
• Versatility. The construction of buildings can be done according to the given dimensions. To do this, the pile rods are screwed to the required height. They can be mounted in any soil (except rocky). They are perfect for sites near ponds, marshy soil. On the pile pipes, the veranda can be built not only during the construction of the main building, but also to attach it to an existing house. You can mount such terraces in any season.
• Sustainability to frosty swelling of the soil.

If such piles are correctly installed and treated with anti-corrosion agents, then they can last up to 100 years. This period can be shortened if an electrical substation, cell towers are located nearby, or a railway passes, as the leakage of current from these objects into the soil accelerates metal corrosion.

Did you know? Screw piles were invented by engineer Alexander Mitchell to solve the problems of building offshore structures on soft soil. He received a patent for the discovery in 1833, and a few years later he was awarded a medal.

Pile requirements

Pipe pipes for the veranda must meet certain requirements:

1. Since the completion is quite easy, then rods with a cross section of 58-59 mm are quite suitable. They will cope with a load of up to 3 tons. For small buildings and utility units, manufacturers recommend pipe diameters of 76–89 mm. If you plan a large and closed veranda, then it makes sense to take rods with a diameter of 108 mm, which have a bearing capacity of up to 7 tons.
2. The length of the pile rod is selected depending on the soil. So, if the soil on the site is mobile (sandy, swampy), then large pipes should be acquired. The most commonly used rods are 2.5 m long. Products for 0.5–11.5 m are also on sale.

When choosing the size of pile pipes, the following factors should be considered:

1. Soil on a building plot. Sometimes the owners of household plots to determine the stability of the soil seek the help of specialists for geological research, analysis of the composition of the soil in the laboratory.
2. The depth of freezing of the earth. For the central region of Russia, the Urals and the Volga region, it is 2.5 m, and in Siberia the soil freezes deeper, so pipe options from 3 m should be used there.
3. The relief of the site and the degree of slope.
4. Features of the foundation and its elements.

Piles come with a welded and cast screw. The second one is considered the most reliable, since with poor welding the product quickly fails.

Pile foundation construction technology

The first step is to choose a project of the veranda and draw its plan, having decided on the exact dimensions. After drawing up the drawing, it is already possible to calculate the number and weight of materials that are needed to mount the piles. It should also take into account the quality of the soil and the depth of water, the level of freezing of the soil. After that, you need to select the correct parameters and the number of pile pipes, given that their distance from each other can be 1.5–3 m.

Important! When calculating the load on the foundation, one should take into account not only the weight of all building materials, but also the mass of furniture and equipment that are planned to be installed inside the extension. It is also necessary to take into account the weight of the snow lying on the roof in the winter.

The easiest way to build a do-it-yourself open veranda from a wooden beam. Snow load by region can be found in the Building Code and Rules in the “Loads and Impacts” section. For example, in St. Petersburg, for every 1 m² of roof there is up to 180 kg of snow mass.

Video: extension to the house on screw piles

Necessary materials and tools

When erecting a summer terrace on a pile-screw foundation, you need to purchase the following materials:

• sand;
• crushed stone;
• cement;
• screw piles;
• wooden bars for logs and roofs (100 × 50 mm);
• beams for grillage (metal, concrete or wood);
• boards;
• nails, screws;
• varnish or paint for wood;
• roofing material (selected in accordance with the roof of the main building).

For a light wooden veranda, it is better to take a profiled coronal beam with a cross section of at least 150 × 150 mm as a grillage. In addition to the above materials, it is necessary to treat the piles with anti-corrosion agents, for example, bitumen.If the house where the veranda is being built is solid, then the rods must have a certain (for example, electromechanical) treatment. Otherwise, they just rub off on the breed. The wood of the veranda also needs to be treated with impregnation for outdoor use.

It is necessary to stock up with such tools:

• a shovel;
• winding collar;
• welding machine;
• deep sealant for concrete mix;
• angle grinder with cutting wheels (grinder);
• a hammer;
• a saw;
• screwdriver;
• tape measure;
• plumb;
• level (normal and hydraulic);
• pegs and rope.

A manual winding gate is already sold with rods.

Important! In case of piling independently, without the use of special equipment, enough products with one blade.

Preparatory work

First you need to clear the place where the extension is planned. Then you need to dismantle the porch and the blind area. The soil under the screw foundation can simply be leveled with a shovel. After that, with the help of pegs and rope, they mark the perimeter of the veranda. Next, the installation sites of the piles are planned and small holes are dug in them for easy screwing.

How to screw in screw piles

The procedure for installing screw piles is as follows:

1. The core tube is inserted with a blade into the hole and screwed into the collar. It is best when this procedure is done by two people. At the beginning of screwing, it is required to constantly check the vertical position of the piles with a plumb and adjust it, if necessary. In the presence of a slight deviation, the piles are cut off, leveling the ends even. On the surface, usually 20-30 cm of pipe is left (depending on the height of the base).
2. When all the piles are set to the desired depth, then using the hydraulic level at elevated ends, make marks for the grillage.
3. The rods are cut with an angle grinder at the marked level.
4. Concrete is poured into the pile cavities and immediately compacted with a sealant.
5. A steel rod is inserted into the middle of the cement mixture (this is necessary for a veranda with a wooden grill). Then the lower crown beam is attached to it.
6. The pipe is closed with a head and welded.
7. Top mounted waterproofing.

When determining the parameters of the veranda adjacent to the wall of the house, draw a line. When applying it, take into account the thickness of the lumber, which is laid on top.

Did you know? The first piles looked like a metal pipe with an anchor screw at the end, and they were screwed into the soil with a wooden wheel.

Installation of grillage and floor

A crowbar is laid along the piles along the piles. If the veranda is of considerable size, then the beams are hammered inside the perimeter, followed by strapping. There, with the help of a corner and screws, lags are fastened with an interval of 50-60 cm along the perimeter of the structure. Below you can make a base from siding or plates. Then they install vertical racks in the corners to which a canopy or roof will be attached. Across the lag, flooring is made of boards. The voids between them are recommended to be filled with gravel.For a closed structure under the floor, it is better to make a cement screed and use insulation. This is not necessary for the summer terrace. Next, make the upper harness and attach the frame from the rafters to it. A lath is nailed to it, on top of which insulation and roofing material are mounted. The last to install a veranda fence. The tree is varnished or painted. The terrace on screw piles should not fit snugly against the wall of the house.

Did you know? In 1864, a pile-screw foundation was used to build the Sukhumi lighthouse in Abkhazia. The construction of a navigation structure with a height of 37 m took 150 days. Since then, it has never been rebuilt.

Its foundation may slightly settle, so the design should be independent. A gap of 2-3 cm is made between the veranda and the wall, which is filled with insulation (for example, mineral wool). The foundation of screw piles for the veranda of a private house can be installed independently, without carrying out earthwork and waiting for concrete to harden. This significantly reduces the time and finances for the construction of the extension.