How to insulate an iron entrance door: step-by-step instructions, choosing insulation, insulation features

Warmth and comfort in the house are the main tasks facing every owner of his own living space. Particular attention is paid to the front door, as it is in direct contact with the street. And in the cold season, heat can leave the room through the doorway. To avoid unpleasant consequences, you should insulate the front door. You can do this work yourself. But before you insulate a wooden door in a private house, you should prepare everything necessary for this.

What causes heat loss?

A modern metal entrance door is actually a complex structure, where iron is just a shell. The cavities of the leaf can be filled with insulation, since the main function of the door is to retain heat. But there are often heat leaks, not only in private houses, but also in apartments. In addition, inexpensive metal doors have ordinary tin as a body, and cardboard honeycomb instead of insulation.
Reasons for heat loss in the house:

1. Thin walls. Walls built in the classical way several decades ago, which do not have insulation, begin to freeze over time. As a result, the thermal insulation of the house deteriorates.
2. Cracks and crevices. When a heavy structure shrinks, cracks form on the walls, which over time, if you do not pay attention to them, turn into huge gaps. Such gaps are also called cold bridges.
3. Technical openings (old doors and windows). Over time, the wood dries out, thereby forming colossal gaps where the boxes are installed. Windows that are not properly insulated are one of the key sources of heat loss. And a door, if it is made of sheet metal and does not have the necessary insulation, or is of poor quality Chinese construction, with cardboard inside instead of a heat insulator, this is the direct cause of colossal heat loss.

A metal door that does not have proper insulation is a direct source of cold in the house.
Therefore, door insulation is an important component of the thermal protection of the entire house. But before you implement your idea, find out the exact reasons for the loss of heat, so that you don’t end up wasting time and energy on insulating the doors, and the reason for the uncomfortable microclimate lies in the cold bridges formed through the cracks in the house.

Important! The thickness of the iron door leaf is not an indicator of the thermal insulation of the door. A thick layer of metal is, first of all, protection against penetrations and only then a heat insulator (provided that there are no cracks in the structure).

Sometimes heat can be lost not through the leaf, but through the cracks of the iron door frame

Plastic

Installation of insulation is carried out similarly to wooden structures. A plastic door, which is covered with dermantine on top, will provide good protection from the cold. Only here it is necessary to replace the nails with construction glue. The process goes like this:

1. remove the door;
2. remove the fittings;
3. install insulation;
4. lubricate the structure and all elements, and then install the handles back;
5. decorate the surface according to personal discretion.

Choosing insulation

The insulation on the door not only protects the room from the cold, but also insulates the rooms from extraneous noise, which is quite important in apartment buildings. Therefore, when choosing a ready-made door structure, you should inquire about its contents.

Penofol

Penofol is equipped with a foil layer with reflectivity, thanks to which all the heat remains indoors. But, as a rule, it is used only as an auxiliary insulating material.

Rigid (sheet) insulation

Sheet heat insulators (penoplex, polystyrene foam, etc.) are easy to install and low in cost. Since the material is not hygroscopic, it is not necessary to attach a vapor barrier and moisture-proof membrane when installing it.

When choosing rigid insulation, give preference to expanded polystyrene (penoplex). It is much denser and stronger than polystyrene foam, and also insulates more effectively.

Soft (rolled) insulation materials

Rolled or sheet soft thermal insulators include glass wool and mineral wool. They differ only in the base; their thermal insulation characteristics are approximately the same. The material is environmentally friendly, non-flammable, and allows you to independently choose the installation height, eliminating additional trimming. These advantages make cotton insulation especially popular.

Illustrative examples of heat loss

The material is sold in rolls or slabs. Elements of any shape and size can be cut out of rolled wool, and to reduce the thickness of the insulating layer, simply press and fix the material.

The disadvantage of cotton wool is its high hygroscopicity. The material is afraid of moisture and if the insulation absorbs water, it loses its heat-protective properties. Experts do not recommend using this insulation for doors, since with a high contrast of external and internal temperatures, the likelihood of the insulation getting wet is extremely high. However, the option is quite acceptable for the entrance door to an apartment.

Inflatable (sprayed) insulation

Polyurethane foam fills all the cracks without being particularly expensive. You can spray it yourself, using a foam gun or inviting the help of a specialist using a special sprayer.

Luxury entrance doors

doors are insulated with three types of heat insulators:

• key insulation – polystyrene foam;
• penofol is an auxiliary protection;
• The cavities of the door frame and stiffeners are filled with polyurethane foam

In construction markets you can often see insulation kits for entrance doors. The insulation and finishing material have already been measured and cut according to the standard, but such sets are of little use, since they include thin-layer padding polyester or foam rubber and leatherette.

Tools and materials

In addition to insulation - the main material, you also need fasteners, cladding, etc.

Polymer seal for entrance door

Table 1. All necessary materials and tools

Prices for popular models of screwdrivers

Screwdrivers

Important! If glass wool is chosen as the main insulation, do not forget to take care of protecting the skin of your hands, eyes and breathing organs by using glasses, gloves and a respirator. When working with the material, dangerous microparticles (fiber fragments) are released, which, penetrating into the respiratory tract, can cause long-term irritation of organs.

Video - A simple process of insulating a non-removable Chinese door

We insulate the door frame

The frame of the metal door leaf is made from an iron angle, which is secured in the opening with anchors. After removing the old door structure, large gaps often remain between the mounted door frame and the load-bearing wall or partition. When installing, builders blow them with polyurethane foam, but it has a certain drawback: the material is afraid of sunlight. If sections of the foam are not protected from ultraviolet radiation in time, it will crumble into dust over time.

If the foam on any surface turns yellow or brown, the material is beginning to deteriorate.

The old deteriorating foam from the box must be removed and insulated again

How to do it correctly:

1. We clean the wall adjacent to the doorway from the remnants of the polyurethane foam, spread the plaster down to the brick or concrete and remove the dust.
2. Spray the surface with plain water and foam the visible indentations. The foam will stick better to the wetted wall.
3. When the material hardens, cut off the excess.

Prices for polyurethane sealant

Polyurethane sealant

After this, plaster and paint or whitewash can be applied around the box.

We insulate the door leaf

Before insulating an iron door, the structure must be disassembled. To do this, remove the peephole, door handles, locks and linings.

Before insulation, the iron door must be prepared by dismantling all unnecessary

When the canvas is completely prepared, do not forget to wipe it from dirt and dust before starting work.

Step-by-step algorithm for door insulation

Table 2. We insulate the door

When the glue dries, do not forget to check the door for cold bridges. the gaps formed between the insulation and the frame with foam, not forgetting to cut it off after hardening.

When insulating a metal door, it is important to cut the insulating material in such a way that the gaps between the heat insulator and the frame elements are minimal or completely absent

Prices for mineral wool

Minvata

Clearance seal and door interior trim

Decorating the front door from the inside performs several functions. This is protection of insulation from mechanical influences and other damage, additional heat and noise insulation, as well as a decorative component.

An example of a metal entrance door trimmed with clapboard after insulation

There are a number of requirements for the interior decoration of the door leaf:

• strength,
• moisture resistance,
• durability,
• density,
• external attractiveness.

In most cases, a metal door is sheathed from the inside with laminated chipboard or MDF, plastic or lining, wood or metal, plywood or OSB in combination with leather or dermantine.

External view of the interior decoration of a metal door with plywood and dermantine

Let's consider the algorithm for the internal design of an insulated iron door using the example of using solid sheet materials:

1. We cut out a fragment from the sheet to the size of the perimeter of the door leaf frame. It is important that the material does not protrude beyond the sheathing.
2. We cut out holes for the peephole, handles and lock secrets in the resulting fragment.
3. If you plan to additionally cover the sheet with leather or dermantine, then it is recommended to first upholster the sheet, and then attach it to the door. It is more convenient to carry out upholstery work when the base is in a horizontal position.
4. We cut out a solid piece of leather fabric to the size of the base, adding 10 cm on each side.
5. We bend the allowances inward and thus attach the material to the base using a stapler. In addition, you can secure the leather with beautiful furniture nails.
6. When attaching the fabric to the base, it is important to stretch it well so that unsightly folds do not form. For additional thermal insulation, a small layer of foam rubber or synthetic padding can be placed under the skin. It will also fill the void between the skin and the base and add more appeal to the design.
7. When the plywood fragment is completely formed, we coat the door frame with universal glue, apply the plywood to it and fasten it with self-tapping screws with decorative heads (it is important that the self-tapping heads are harmoniously combined with furniture nails).
8. We install door handles, locks, peepholes and plugs.

Insulated metal door, covered with plastic after insulation

The final stage is the installation of a polymer seal to prevent drafts from penetrating through the cracks around the perimeter of the door. To do this, the surface of the door leaf and frame is degreased, the protection from the adhesive layer of the seal is carefully removed, the material is applied to the door and pressed. It is important to be careful when installing the seal, as the material is very thin and requires patience during installation.

Video - A budget way to insulate a cheap Chinese door

Sealing with rollers

The upholstery of a country house door from the outside must be completed by installing special rollers. To make them, you will need to cut 4 strips 10 cm wide. The length of 2 strips is equal to the width of the wooden panel with an allowance of 10 cm. The other 2 parts are cut according to the height measurement, not forgetting to leave the same allowance (10 cm).

It is necessary to cut strips from foam rubber or other filler, the length of which corresponds to the length of the leatherette parts, and the width is 2-3 cm less. You can insulate wooden entrance doors with rollers both before and after installing the paneling.

Installation

Place the previously prepared leatherette parts along the edge of the door: long strips in height and short strips in width. Laying is done inside out so that the edge of the strip is at a distance of 1-2 cm from the edge of the wooden base. Fastening can be done with staples of a construction stapler or small nails with an enlarged head (upholstery nails). The fastening pitch is 10-15 cm along the entire perimeter of the canvas.

For better thermal insulation of doors, a strip of insulating material should be laid on a nailed strip of leatherette, 1 cm away from the edge. Bend the roller lengthwise in half so that the insulation is inside the upholstery. Tuck in all free edges and secure the edge of the roller to the wooden panel with decorative nails.

The fastener also performs a finishing function. Nails can be driven in at random intervals and even close to each other, but you need to ensure that they are evenly placed. The installation is completed by fastening the previously removed fittings: you need to cut holes for the handles, and fasten the locking plates over the upholstery.

Features of insulation of a metal split door

The algorithm for insulating a metal split door is not much different from the process of thermal insulation of a conventional iron door leaf. The design feature of the door plays a key role here.

Sectional view of a metal split door

The door is removed from its hinges, laid on a horizontal surface, all functional and decorative elements in the form of a peephole, handles, locks and plugs are dismantled, then the internal lining is dismantled (if the product is not monolithic, then the trim is attached with self-tapping screws). In the case of insulation of a non-removable door, the inner lining can be carefully cut with a grinder. When the product is disassembled, cardboard is removed from the cavities and the door is cleaned of any remaining debris and dust.

If there are stiffeners inside the door leaf, drill holes in them at a short distance from each other and fill the voids with foam.

Next, a water barrier is installed, the insulation is cut and attached (remember that some materials do not require moisture protection). The insulation process itself is as simple as in the example with a one-piece door.

The overlay is installed in place. If it becomes unusable after dismantling, the interior design of the door can be replaced. Then the peephole, locks and handles are put in place and the product is installed in the box.

In order not to spoil the integrity of a non-removable Chinese door, it is insulated over the skin

In the case of a monolithic door, if there is no particular desire to spoil its integrity, you can insulate it on top of the existing casing. To do this, a lathing made of timber is attached to the demonstrated and disassembled door leaf from the inside and outside. All further actions are practically no different from the previous algorithms.

Re-sheathing

Before you figure out how to insulate an iron door with your own hands, you need to think about the exterior finishing. We're talking about upholstery. So, leatherette or leather substitute is perfect for these purposes. Next we do this:

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• We lay the material on the door.
• We cut off the canvas, leaving a margin of 10-20 centimeters on each side.
• Fold leatherette or leatherette beautifully.
• Secure with special decorative nails.
• We return hinges and fittings

Once the door is insulated and finished, we return the hinges and fittings to their places. To do everything right, it is better to photograph their location in advance. It is better to choose new handles - to match the color and style of the new design.

Things to consider

In addition to the thermal insulation of the door leaf itself, the process of door insulation includes other important nuances.

For a better fit of the door leaf to the steel frame, use rubber seals

Polymer sealing tape will help improve the quality of thermal protection of the door. This material is supplied in rolls and sold by the meter. Installing the tape is extremely simple: the seal has an adhesive edge, which attaches it to the door and frame.

Important! Before gluing the tape, do not forget to degrease the surface for better adhesion of the material to the surface.

If the design of the door frame allows, the seal can be glued in several layers

Insulating the doorway itself with polyurethane foam is also very effective. This can be done even if the cavities show no signs of material degradation. Blowing out the voids with foam and then plastering the wall will not be difficult, but will significantly increase the efficiency of insulation.

Also consider the weight of the structure. The weight of a metal door is quite large, and if you add additional insulation and cladding to it, the hinges may not withstand it

The thickness of the door insulated from the outside, as a rule, increases. Take this fact into account when installing locks: they may need to be replaced with designs with extended keys.

The slopes of the metal entrance door also need insulation

Another source of heat loss is indoor door slopes. If they are not completed or sewn up “in a hurry,” they should be given attention. Remove the old finish and fill the cavities with foam. If the space is large enough, fill it with other insulation and secure the trim.

Prices for entrance doors

Entrance doors

How to deal with condensation?

If the insulation has high thermal conductivity, this can lead to the formation of condensation. The appearance of moisture here is associated with a large difference between the temperature indoors and outdoors. To eliminate it, it is necessary to create a thermal break, for example, install a second wooden door. That is, you will need an organized space between the room and the door, or better yet, between the layers of the door leaf inside and outside.

All this may not seem entirely convenient. In this case, ready-made metal doors with a thermal break will come to the rescue, which can be ordered in the store directly along with installation. You can find them by the name “thermal doors”. In fact, they are standard structures with inserts made of corrugated cardboard, polyurethane foam or other materials.

Common Mistakes

Anyone can stumble: both an experienced installer and a novice home craftsman. When insulating a metal entrance door, there are a number of common mistakes that are most often made.

It is better to insulate a metal door that can be easily opened with a can opener without disassembling it, on top of the inner lining

What to watch out for:

1. Season. During the cold period, it is better to postpone door insulation until later, even if there is a very warm entrance or dressing room.
2. Ignoring details. The gaps between the frame and the material during insulation, the door frame and slopes also need thermal protection, just like the canvas. If you only insulate the door, the room will not become much warmer.
3. Saving. When using natural insulation, you should not ignore membrane films, because otherwise the cotton wool will get wet and become useless. In addition, wet insulation will significantly increase the weight of the door, which can lead to deformation of the fasteners.

A metal door insulated in accordance with all the rules, in addition to providing armor against evildoers, will also reliably protect the house from extraneous noise and pervasive cold. In addition, insulation protects the canvas itself from corrosion and, accordingly, increases its service life. Use the materials that are available to you and don’t be afraid to make mistakes, because only those who do nothing make no mistakes.

Some models of metal entrance doors are already insulated from the factory

Note! If your door has already used up its lifespan, instead of insulation, you should think about a modern solution in the form of a door with a thermal break.

Advice from professionals

The following recommendations from experienced craftsmen will help you avoid common mistakes when insulating a wooden front door:

It is more effective to use heat-insulating material on both sides. You should choose consumable components from trusted manufacturers. The selected material must have high performance characteristics. The outer cladding must be resistant to precipitation. Each stage must be treated with full responsibility. In the video on how to insulate a door with leatherette with your own hands, you can get acquainted with some of the features of the work: