Freezing a well is a very unpleasant event for residents of country houses who use well water for water supply all year round. Avoiding this is quite simple - to make the well warm with your own hands. And for a positive result, you need to know the specifics of performing thermal insulation and understand the materials. Do you agree?
We will tell you how to correctly choose a heater for thermal insulation of a well mine. Here you will learn all about the methods and nuances of the work. Based on our recommendations, you can ideally protect the water source from exposure to low temperatures.
Reasons for freezing wells
Will the well freeze in winter? This can be predicted with a high degree of probability.
Firstly, if a natural tree was used for the construction of the well, it will not freeze even with prolonged exposure to subzero temperatures. Our ancestors used this property when constructing wood wells.
Modern wells are constructed using reinforced concrete rings, and given that this material has high thermal conductivity, the well will freeze in the same way as the surrounding soil.
Secondly, it is necessary to pay attention to the water level: if it does not exceed 1.1-2.2 m, then the risk of freezing is very high. If the well is deep, and the water in it is below the level of soil freezing, then water does not freeze.
The third factor to consider is the depth of soil freezing in the region. In the southern regions, the freezing depth rarely exceeds 0.5 m, in the temperate - 1-1.5 m, in the north - below 1.5 m.
Thus, the question of how to properly insulate a well for the winter confronts the owners of reinforced concrete wells located in temperate and northern climates. For residents of the southern regions, it is less relevant. There are enough minimal measures - the construction of a heat-insulated cover, and the well itself does not need thermal insulation.
Freezing of a well made of reinforced concrete rings can be prevented by making high-quality insulation, which allows uninterrupted use of water from it all year round
Why is freezing wells dangerous?
It is a mistake to assume that the insulation of wells is necessary only when it is used year-round. Many summer residents and seasonal residents of country houses sincerely do not understand why to insulate a well, which no one uses in winter anyway. Meanwhile, such seasonal wells also need effective thermal insulation!
Otherwise, a variety of problems may arise that make the operation of the well difficult or completely impossible:
- ice plug formation in the water system;
- the displacement of the rings resulting from the expansion of frozen water in the surrounding soil;
- failure of the ice plug and damage to pumping equipment;
- the divergence of the joints of reinforced concrete rings when water gets between the seams.
Wells unprotected from low temperatures often require repair work. And for financial costs, repair measures are often more significant than conducting one-time insulation work.
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A good reason for warming a well
Ice cork in a non-insulated well
Destruction of concrete well walls
Concrete well ring shift
If a water supply system based on a well is arranged on a suburban area, then in addition to the shaft itself, it is necessary to insulate the pipes to protect the system's supply line from low temperatures.
Materials and production technology
It is necessary to take care of the insulation of a reinforced concrete well at the stage of its construction.
In this case, you will immediately receive a water source that you can use all year round, and which does not require expensive repairs. Thermal insulation during the construction process will cost you much less, and the amount of earthwork will be less.
If the well, which has already been built and is in operation, needs insulation, then a sufficiently large-scale excavation is necessary - digging a trench around the well shaft for fixing the insulation. Installation of insulation should be carried out at 0.5-1 m below the level of freezing of the soil.
It is recommended to carry out warming of the existing well to reduce costs and reduce the volume of earthwork in conjunction with warming the water supply system
We will analyze what heat-insulating materials can be used for wells built from reinforced concrete rings.
Heater # 1 - Styrofoam
Polyfoam is a synthetic polymer thermal insulation used for warming reinforced concrete wells, both under construction and already existing.
The advantages of foam include:
- high thermal conductivity;
- low degree of water absorption;
- resistance to deformation;
- ease of use;
- low cost in comparison with other heaters.
One of the main advantages of the foam is that it is available in the form of a system of insulation for round and semicircular elements, ready for the device, whose diameter exactly matches the dimensions of the reinforced concrete well rings.
This greatly simplifies the process of insulation, which is carried out according to the following technology:
- Preparing the walls of the well for fastening the insulation. Preparation consists in cleaning the surface of debris, soil and other contaminants.
- Installation of thermal insulation (rings, half rings or individual insulation boards) with the help of glue applied to them for facade work.
- Strengthening the fastening of foam rings with special dowel nails for concrete. It is carried out if necessary.
- The device of the vapor barrier. Any vapor barrier material is suitable here.
- Filling the trench around the well with soil, compaction and tamping.
As you can see, there is nothing complicated in the technology of insulation work using foam. However, it is worth noting that, in addition to the advantages, the described thermal insulation has some disadvantages.
Such rings must be fastened to the walls of the well as tightly as possible, avoiding the formation of gaps in which condensate will accumulate in the future, which destroys the insulation layer
Polyfoam is unstable to the effects of insects and rodents, and low-quality samples of it can release toxic substances into the environment when heated when heated, styrene, which poison the soil and the upper layers of the soil.
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Mine insulation below freezing
Clearing the wellbore from the ground
Waterproofing a concrete well mine
Insulation of the walls of a concrete well
Insulation # 2 - extruded polystyrene foam
This insulation resembles foam, but has some differences: slightly lower thermal conductivity, higher resistance to low temperatures and aggressive environments. The material perfectly withstands the load, so it has found wide application in the construction of underground pipelines.
For thermal insulation of a well, extruded polystyrene foam of the following grades can be used: Technoplex, Tenziplex, actively used in the construction of Penoplex, URSA of Russian production.
Imported analogues will be identical in properties and quality to Russian ones, but at a cost significantly higher. By the way, thermal insulation based on extruded polystyrene foam is 20-30% more expensive than foam insulation.
Expanded polystyrene heaters are available in the form of plates of various sizes. For wells, it is recommended to use slabs with a minimum transverse size of 30 cm, which can most accurately be laid in a circle in the shape of the well. The technology of the thermal insulation system is exactly the same as with thermal insulation foam.
The resulting joints must be sealed with foam for outdoor use. To ensure a snug fit and additional protection against groundwater, a winding of the insulation installed on the reinforced concrete rings is made with a roll of waterproofing material.
The advantages of using extruded polystyrene foam include:
- does not deform under the influence of loads (soil layer);
- resistance to mold, corrosion;
- durability, retains thermal insulation properties for more than 25 years.
When warming the outer part of the well, located above the surface of the earth, it is advisable to fix the insulation with special metal brackets to prevent its movement.
The process of warming a well mine in steps will be presented by the following photo selection:
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Insulation of the head and blind areas of the well
Device for waterproofing the base of the head
Cutting polystyrene foam for the construction of the blind area
Laying insulation around the head
Pouring concrete sweep around the head
Reinforcing mesh device in formwork
Laying polyethylene on the blind area of the well
The result of warming the well with polystyrene foam
Heater # 3 - cellular polymeric materials
Materials belonging to the group of closed-cell insulation based on a polymer basis have found the widest application in construction. Due to its properties: high characteristics of thermal insulation, resistance to moisture, ductility, these heat insulators are increasingly used for warming reinforced concrete wells.
One of the types of polymer insulation with a cellular base is isolon. Its analogs are also presented on the construction market: plex, isonel, tilite, foam rubber, etc. These materials are produced in the form of rolls, which allows thermal insulation of round reinforced concrete wells without problems.
Most materials in this group are self-adhesive, i.e. do not require additional fastening to reinforced concrete walls.
The technology of insulation with isolon or its analogues is as follows:
- Surface preparation of the outer walls of the well.
- Processing reinforced concrete rings with a special primer that improves the adhesion of concrete and insulation.
- Gluing the isolon with glue for outdoor use (if the material is not self-adhesive).
- Sizing joints with duct tape.
- Backfilling of the trench and compaction of the soil.
Mineral-based cellular heat insulating materials include foam glass produced by foaming silicate chips under special conditions. Such a heater has good thermal insulation, is environmentally safe, easy to use, but its too high cost does not allow it to be used for thermal insulation of wells.
To reduce the cost of insulating insulation, it is recommended to use non-foamed material - its cost is much lower, and the additional properties that the foil gives, in this case, do not matter
Heater # 4 - polyurethane foam
Polyurethane foam - a heater with unique properties: high thermal insulation, resistance to humidity and aggressive environments, it is not susceptible to insects. The service life of polyurethane is at least 50 years!
Today, manufacturers offer two types of polyurethane foam insulation: ready-to-use, sold in special containers, and in the form of a dry mixture that requires dilution before use. Polyurethane foam is applied to the surface using special spray equipment.
The technology for creating a thermal insulation system is as follows:
- Surface preparation and priming.
- Dilution of polyurethane foam mixture in accordance with the manufacturer's instructions.
- Application of polyurethane insulation using a special spray.
- Painting the aboveground part of the well with paint for outdoor work.
Polyurethane foam has optimal thermal insulation properties, and the method of application in the form of spraying allows you to create a durable thermal insulation layer without seams and joints. The applied composition hardens within a few minutes, and the final hardening occurs after 4-5 hours.
The disadvantage of this method is the high cost of the material, polyurethane foam is one of the most expensive insulation, as well as the need for special spray equipment. Another disadvantage is that it is necessary to apply insulation only in the temperature range from +15 to +30 degrees.
Polyurethane foam is not only an excellent heat insulator, but also reliably fills all the cracks and cracks formed on the outer walls of the well
Why can not you use mineral wool?
Many people wonder how to better insulate a winter water well with such a popular insulation as mineral wool. The answer is simple: it is strictly forbidden to insulate a well with mineral wool!
Insulation for a well made using mineral wool will not last long, and after a few years you will find that the well will begin to freeze
Having good thermal insulation properties and low price, this heater, however, has an important significant drawback, which makes its use for thermal insulation of wells impossible.
We are talking about the ability of a material to absorb water from the environment. Therefore, the parameter mineral wool is a “leader”, it quickly absorbs moisture, while losing its heat-insulating qualities.
Well cover and wooden house
To ensure the best protection of the well from freezing, in addition to warming the well shaft, it is also necessary to carry out external insulation work. They consist in the device and insulation of the well cover and / or the construction of a wooden house over the well.
The cover for the well must be installed taking into account the maximum water level. The movement of the cover is provided with a cable or rope. The best material for making the lid is wood. Also, a three-layer cover of two layers of thick plywood with a heater between them will be an excellent option.
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Arrangement of the well head with a house
Cover for the warmed well
How to use the insulated cover
User friendly design
As a heater, it is advisable to use expanded polystyrene or polystyrene.
If you decide to use a well cover made of reinforced concrete, then it also needs to be insulated by attaching a layer of polystyrene or other insulation. Fastening is carried out using glue for external works and the expansion bolt shield nails for concrete.
In order for the wooden lid to serve for a long time and not swell from water, it is recommended to treat it with a waterproof composition for wood
Installing a house over a well is a more expensive way, however, it has its advantages:
- reliable shelter of the well shaft from debris, rain;
- the ability to use the well in any weather (rain, strong wind);
- aesthetic appearance, a wooden house is perceived as an element of landscape design.
You can make such a wooden house yourself or buy a ready-made version. In any case, it is worth knowing that the house is not installed just on the surface of the earth. He needs a foundation, which is performed as follows: the area around the well is leveled and a blind area is made, onto which a layer of small gravel is poured or tiles are laid.
After that, a wooden house is mounted, and the space between it and the reinforced concrete ring is filled with insulation. In this case, expanded clay can be used as insulation - an inexpensive bulk material.
Video # 1. Insulation of the well with foil isolon:
Video # 2. Creating thermal insulation by spraying polyurethane foam:
In our climate, insulation of a reinforced concrete well is a necessary measure, even with seasonal use. The cost of carrying out insulation work will pay off in the shortest possible time, because you no longer have to carry out expensive repairs of the well and organize the supply of water when it is not working.
The choice of thermal insulation materials in the modern market is large and you will surely find the option that is optimal for you in the installation method and at a cost.
Do you want to talk about your own experience in warming a well shaft or provide useful information? Perhaps, during the familiarization with the proposed information, you had questions? Please write comments in the block below.