How to insulate the front door
Insulation of the entrance door is by and large not very complicated, the main thing is to decide what you want to achieve in the end. If you need to eliminate drafts, then for this conventional seals are suitable, which are sold in almost any building supermarket. If the entrance door itself provides a weak thermal insulation, then you have to work a little more and use different heaters.
The types of seals
First, let's look at the seals, because it's much easier. The market now has a fairly large range of seals, ranging from the most common - foam and ending with expensive rubber - industrial. Immediately it is necessary to say that the foam rubber sealants, which are used for windows, are not suitable for us because they serve very briefly with frequent opening.
It is therefore better to take the rubber seals. Types there are many – are designed for different doors and cracks. If the door you closed, in General, is tight and no significant gaps, you can take a thin R-neck sealant, which will eliminate small cracks. If you have a serious gap between the door leaf and the frame (this is most often found on welded doors from a single sheet of metal), then the best fit D-shaped – thick gasket that can close the gap with a thickness up to 5 mm.
Glue the sealant either on the entire perimeter of the door, or on the side where there are cracks. The process of gluing itself is simple enough due to the fact that on the seals one side is specially treated with adhesive material. It should be noted that over time, the material can become unstuck, in such cases, you can either replace it, or just use dragon glue or other means to fix it in place.
How to insulate a metal door
As a rule, welded doors, made from a single sheet of metal and the corners are on the inner side of the cavity. If this is the door, the process of warming is extremely easy. It suffices to take a suitable insulation, e.g. polystyrene, or Styrofoam, cut it into pieces, in accordance with the size of the cavities and attach to the canvas.
In particular, for fixing you can use mounting foam, glue "liquid nails" or "Dragon". After the material is securely attached to the door leaf, a piece of laminated fiberboard of the appropriate size can be attached from above, or some upholstery material can be used. In fact, in this way it is possible to strengthen any door, whether it is metal or wooden.
All you need for this is a quality insulation that is not absorbed by moisture (such as foam polystyrene in particular), as well as frost-resistant glue (for example, "Dragon"). Naturally, it is possible to fix the heater with self-tapping screws and metal corners, but the method described above is the simplest.
The main thing when installing a heater, remember that the width of the door leaf on the inside is less than the outer one. Also, in some cases, traditional insulation with foam rubber and dermatine can be used. At the same time, the whole algorithm of work remains the same - foam rubber (insulation), glue to the canvas, then it is covered with dermatine, felt or other materials. Meanwhile, this option provides less thermal insulation.