Flat roof do it yourself - building a flat roof

It is considered that a country house with a flat roof looks quite attractive and underlines the consistency of its owners, the sophistication of their taste and originality of thinking. The flat roof can be not only original, but also quite practical. That is why such a construction is often used in regions with low average monthly precipitation.

If you wish to equip a flat roof in areas with a lot of precipitation, allowable loads on floors and reinforcing structural elements should be taken into account.

This article describes how to make a flat roof independently and discusses the features of various types of roofs.

Advantages and disadvantages

Flat roof do it yourself - building a flat roof

The advantages of flat roofs include the following properties:

  1. The original appearance of the building, as well as the possibility of arrangement on the roof of the site, used to taste the owner.
  2. Savings on the construction of a roof that does not require the use of complex roofing systems for its arrangement and that has a small surface area.
  3. Repair of a flat roof in comparison with cattle structures is quite simple and will not take you much time.

The disadvantage of flat type floors is the need for careful design, taking into account possible maximum loads on the structure and the type of material used as a coating. In this case, the project lays the angle of inclination of the future roof (ranging from 3 to 12 degrees - depending on the annual precipitation rate).

Types of flat roofs

Flat roof do it yourself - building a flat roof

The basis for flat roofs are usually either reinforced concrete floor slabs or beam structures made of metal profiles. At the same time, not only the composition of the roofing pie, but also the technology of its manufacture depends on the type of base you have chosen.

According to the method of forming the roofing pie, all known flat roofs are divided into the following groups:

  • classic monolithic roofs;
  • so-called inversion coatings, which are a specialized version of traditional roofs ;
  • roofs made of corrugated board.

In terms of their intended purpose, all such coatings are divided into exploitable and unexploited, differing in the index of foundation stiffness.


Flat roof do it yourself - building a flat roof Monolithic flat roof

The monolithic coating is traditional and widely used types of structures (the so-called "soft roofs"). In the section, such a roof consists of a slab-base with a film vapor barrier placed on it and insulation, as a rule, which is used mineral wool.

A waterproofing carpet made of rolled bitumen-containing material is laid on top of the insulation. The advantages of this kind of multilayer coatings include their relatively low cost and extreme ease of installation.

Flat roof do it yourself - building a flat roof Adjacent to the parapet the scheme

Sometimes metal dvutavrovy are used to prepare a flat roof of the type "monolith" beams with a section of 12‒15 cm, on the lower shelves of which a continuous sheathing of boards is installed, covered with roofing material. The fittings are placed on top with a gap, after which the space is poured with concrete.

After the concrete mixture sets, a classic “soft” coating of roll materials is laid over the ceiling.

Roof of profiled

Flat roof do it yourself - building a flat roof Flat roof of corrugated

Profiled is the most economical a variant of the base used in the manufacture of a flat roof. This material can be used only in those cases when the roof is not intended to be used as a permanently operated platform.

The formation of the roofing pie in this case is practically no different from that already described earlier, except for the fact that such a roof needs additional warming.

Typical composition of the roofing pie

Flat roof do it yourself - building a flat roof Typical roofing pie of a flat roof

In a cut flat roof construction is a multi-layer team structure, which includes the following mandatory elements:

  • flat base;
  • vapor barrier;
  • insulation layer;
  • waterproofing protection.

Vapor barrier of the roof is usually made of plastic film, which does not allow the air vapor rising from the living room to act on the heat-shielding layer of the roofing pie.

A variety of materials can perform the function of a thermal strip in a flat roof, namely:

  • mineral wool slabs;
  • expanded clay and gravel;
  • polystyrene foam plates.

Waterproofing gasket is traditionally made of rolled materials made on a bitumen basis.In addition, modern materials such as special mastics or sprayed membranes can be used for these purposes.

Features of inversion coating

Flat roof do it yourself - building a flat roof Inversion roof

Design of the so-called "inversion" pie is fundamentally different from all the types of roofs we considered earlier and requires separate consideration. In the section, such a coating can be represented as follows:

  1. On the base plate, using a bitumen primer, waterproofing is mounted, over which plates of rigid insulation with a reinforced coating placed over it are mounted.
  2. This whole sandwich, or rather its last layer, is covered with a special geotextile fabric that protects the insulation from external damaging influences.
  3. Any material suitable for their use (including paving slabs) can be used as the final coating of inverted roofs.

Flat roof do it yourself - building a flat roof Inverted roof scheme

Such a roof can withstand quite large loads and can used as a permanently operated recreation area.

Roof construction

According to the current SNiP, a small slope should be provided on one of its sides (within 1–4 °) when arranging a flat roof to avoid the accumulation of rainfall on the surface cover. It should be borne in mind that even a small amount of residual moisture represents a tangible threat to the safety of the entire roofing pie as a whole. All deformations and destruction of the outer coating, which often occur during the operation of the roof, are usually the result of repeated freezing and thawing of residues of accumulated moisture.

Flat roof do it yourself - building a flat roof Flat roof covered with rolled material

As a rule, the angle of inclination of flat surfaces is determined by the location of the main elements (beams of overlapping) and is strictly controlled in the course of their installation. As a rule, the following elements are used in flat roofs for unheated buildings:

  • load-bearing beams or hollow-core floor plates;
  • lath rack (in increments of about 50–70 cm);
  • typical "soft" rolled coatings.

When equipping the roofs of buildings of heated type, this list expands due to the additionally used steam and waterproofing, as well as the insulating layer that is mandatory for this case.


How is the installation of a flat exploited roof effected, see the following video:

See also:

  • How cover the roof with a soft roof
  • The junction of the roof to the parapet
  • How to cover the roof with euro ruberoid
  • Solar panels for the home


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