The question of how to properly insulate the roof of a garage affects the problem of condensation inside the building. But it is precisely condensate that is the number one enemy for the iron horse. These small droplets of water cause a process such as metal corrosion, causing the car body and other metal parts to wear out quickly. Therefore, in this article we will talk about building materials that are used in the process of warming the roof construction of a garage building, as well as about the ways of their installation (installation, pouring, etc.).
Thermal insulation materials to insulate the garage roof
Let's begin our story Since the roof of the garage is a mostly flat version, single or double. Rarely more complex structures. True, we must pay tribute to the fact that the latter are insulated in the same way as the simplest pitched roofs. Therefore, we consider the method of warming flat roofs and the simplest pitched.
Flat roof insulation
What is the flat roof of the garage? These are finished reinforced concrete floor slabs or a cast-in-place monolithic slab with the installation of a reinforcing frame made of steel reinforcement in the form of a lattice. Mount (fill) plate strictly horizontally. This ensures their reliable installation on the walls of the building.
But the drain of rain or melt water provides a small slope of 1-5 °, which is formed by a concrete screed poured on the floor slabs. The latter is additionally a structure that forms a monolithic layer on the surface of a flat roof, ensuring the integrity of the roof as a whole. It is according to the screed that the rolled roofing material is laid, bringing the roof tightness to one hundred percent.
Now we come to the main topic of the article. First and foremost, we’ll tell you how to carry out the insulation of the garage roof outside.
Thermal insulation of the roof outside
This is the simplest option in which you can use different heat insulation materials. Therefore, we will tell about each heater separately and designate how it should be laid on a flat garage roof.
The first most frequently used material is mineral wool in slabs up to 100 mm thick. For a flat roof it is better to choose a dense modification - up to 90 kg / m³. This is one of the most inexpensive materials, which has a good thermal conductivity - 0.033 W / m K. At the same time, we add that mineral wool is a non-combustible material, which is an important factor for garage roofs.
But this type of insulation has one characteristic that negates all other advantages. This is a high hygroscopicity. That is, mineral wool absorbs moisture, quickly turning into an unsuitable layer that does not restrain the temperature outside. Therefore, the heat-insulating layer is closed on both sides with waterproofing films. They do it like this:
on a thin concrete screed , which is filled horizontally, spread out the waterproofing membrane ;
then put insulation , tightly pressing plates to each friend ;
another waterproofing layer ;
screed layer forming roof slope ;
installation of roofing material .
The main task of the manufacturer is not to damage the tightness of protective films and lay them overlapping relative to each other with an offset of the edges within 20 cm.
The following insulation material is polystyrene foam plates. It should be noted that today this kind of insulation is increasingly used for warming garages, and the roof as well. This heat-insulating material has one characteristic, which gives it the right of superiority, it is a high density and cellular closed structure. That is, polystyrene plates do not absorb moisture. Therefore, it is easier to work with them. Usually they are laid directly on the floor slabs, and then poured over with a screed.
The main thing in this process is to create a heat-insulating layer on the flat roof surface without seams and crevices. Therefore, the best option - plates of foamed polystyrene, in the design of which there is a connecting lock "groove-thorn". If plates without a lock were purchased, they should be laid tightly to each other, plus - use foamed sealant with which to fill the gaps between insulation plates. The third option - installation in two layers. At the same time, the panels of the upper layer are laid offset to the half of the plate relative to the elements of the lower layer. That is, the joints between the plates overlap the panels of the upper or lower layer.
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The third heat-insulating material, which is often used to insulate the roof of a garage, is expanded clay. It is poured over the slabs with a layer of at least 100 mm, and then a screed is poured over it. There is another option with the use of expanded clay - the use of expanded clay. This is a cement-based mixture, to which keramzite is added instead of crushed stone or gravel. Of course, this solution is inferior in strength to the standard concrete one, but it exceeds it by several times in its thermal performance. We must pay tribute to the fact that expanded clay concrete is the easiest and cheapest option for warming a roof structure.
And another technology that uses the best insulation today. This is polyurethane foam. It is applied in an even layer of a certain thickness, usually not less than 50 mm. In fact, it is a foam that becomes strong and solid in the air, forming a monolithic structure without seams on the floor surface. And already on polyurethane foam poured concrete screed.
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