The junction of the roof to the parapet

15-04-2018

Useful

Parapet is an integral part of the roof of many houses, complementing their design. It has a certain height, which may be different depending on the situation. At the junction of this protective curb with a roof there is an abutment of the roof to the parapet, which must be carried out according to all the rules.

Device railing

Although the parapet is not one of the main parts of the house, it performs a protective and aesthetic function well. This is a small wall, which is arranged around the perimeter of the roof and looks like a protecting structure. This design is arranged on both pitched and flat roofs. In the first case, the parapet is constructed above the eaves and from the bottom it is clearly visible. In the second case, a small barrier completely covers the roof from view. To prevent precipitation and air flow on the parapet, this elevation is covered with an apron, which can be made of galvanized or copper sheet metal. Structurally, it is equipped with special drips, through which water is drained from the building. Kapelnik exclude the ingress of water to the protected areas of the parapet.

There are options of brick or concrete parapets, covered not with metal aprons, but with concrete slabs.

Principles of junction of the roof to the parapet

So that the aprons of galvanized metal sheets are securely fastened to the fence, grooves and niches are created in the construction of the parapet. In these grooves lead the upper edges of the aprons, which are metal sheets bent into profile products. Aprons can be used from black steel for the roof, but it should be painted on all sides with the use of heated drying oil. Niches and grooves are provided for the device adjoining the construction need. From practice it is known that the roofing sheet in a single copy is not enough. This is due to the fact that the vertical sections are not always flat. In addition, unstable temperature conditions and precipitation have a negative effect on fastening. In connection with these negative phenomena apron may loosely fit to the curb. With the help of grooves, these problems are solved.

When the edge of a sheet made of a particular material is turned into a niche, its height must be at least 0.1 m.
In the case of use for the installation of the apron pens, the latter is sealed with a cement-sand mortar, which protects the structure from precipitation.

At a distance of 1 m from each other along the length of the parapet set wooden cork impregnated with antiseptic. The corks fix bars, having a triangular shape in cross section. From above this construction is covered with an apron.

Laying apron fragments is done in the direction in which precipitation will flow, and the overlap should be at least 0.1 m.
If the roof is flat, then its joint with the fence is covered with waterproofing in several layers. Mastic waterproofing needs reinforcement. Geotextiles or glass based materials are best suited for this purpose. At installation it is arranged overlapping at 0.15 m. The material is pressed against the vertical surface through an additional rim. Then the resulting structure is coated with emulsion or mastic. After the bonding agent has cooled down, a second layer is laid on the first layer. To "puff cake" did not crawl, it is attached with a metal apron, which among other things performs a protective function. The drawing well demonstrates how the junction of the mating surfaces is arranged.

Adjacent device with a soft roof

When joining a roll-type roof parapet, special attention should be paid to waterproofing - it must be reinforced. When installing the roofing material should wind up on a vertical wall. When laying the material, there must be a special support at the interface.

In the absence of an auxiliary rim, a vulnerable cavity is formed at the interface between the roof and parapet surfaces. In this place, the flooring under mechanical impact can easily be damaged, as a result of which the coating will depressurize.

To avoid problems associated with damage to the roofing material, the joint between the surface of the roof and the parapet is laid with a supporting rim, which has 2 angles of 45? In cross section. His device is conducted from a mixture based on cement and sand. Instead of this support you can put a wooden bar impregnated with bio-and fire-retarding agent, which in the cross section has the form of an isosceles triangle. Due to such a side, the coating material will adhere tightly to the entire adjacent surface.
If the waterproofing material is roofing material, then using hot bitumen mastic, the rolled material must be glued to the entire surface of the roof starting from its base and ending with the wall of the parapet, inclusive of the rim. After some time, the operation must be repeated, covering the roof with a second layer of roofing paper. During the construction of the parapet in its inner surface a special groove is arranged. When performing junction of two surfaces, the edge of the roofing material from the outside is inserted into the completed groove. Possible junction site with the establishment of roofing material on the upper portion of the parapet.
If the edge of the roofing stripe enters the gutter, the material must be fixed with a metal bar that will press the roofing material against the wall using dowels. This part and joint are sealed with sealant. The next layer will be the paint protecting the structure from precipitation. At the end of the parapet is put on a metal apron, which can be attached to the bar.
In the variant with the establishment of roofing material on the top of the parapet, the roofing material is first fixed with heated bitumen, and then covered with an apron or slabs.

There are technologies for the junction of these surfaces with the use of mastic means having hydrophobic characteristics. With this treatment, the coating is created without seams, and the junction is sealed securely.

Video

Installing the junction of the parapet, if made ventilated facade: