The roof of the webs

Roll roofing materials are easy, economical, and when they are performed in compliance with all technical requirements are quite reliable. These disadvantages include a small fire, a little mechanical strength and unsightly, so often they are used in the construction of commercial buildings.
Roll roofing materials are flexible insulating carpet that plank dry or glued to the ground by c hot and cold mastics.
Roll roofing are one-, two-or three-layer (usually double-layer). In clout roofs are made of two layers of roofing felt, in Asphalt - the bottom layer is made of glassine or roofing underlayment.
Typically, this type of roofing used on gentle slopes, the slope does not exceed 12 °. Ground under the roof can be single or double. The latter is preferable.
Single-layer solid base made of planks of 25 mm and a width of 90-120 mm. The first bearing, two-layer base layer is made of planks of 25 mm and a width of 100-120 mm, packed with a gap of 45-50 mm. Second, alignment, made of planks of 15-20 mm and 80-100 mm wide, arranged next to each other at an angle of 45 ° to the eaves.
In order to work with roofing roll, preliminary it must hold for some time in the form of peeled or rewind to roll backwards.
When coating dry sheet flooring plank in 2 layers - one along the cornice, and the other - perpendicular to it. Each layer on the edges nailed. The final fixing of coating with cross rails 30 x 30 mm nailed perpendicular to the eaves.
Cover the roof roll material can be dry in another. For this to the crate perpendicular to the eaves nailed triangular cross bars 50 x 50 mm (Figure 43).



Устройство кровли с использованием треугольных брусков



Fig. 43. Roofing with triangular bars: 1 - roll material, 2 - triangular block, 3 - head of roofing or roofing.

The distance between the bars should be less than the width of the web of material by 100 mm. Pre-cut fabric with double layer placed between the bar and nailed clout nails every 500 mm. In this case, on the crest of the bar get a seam that is covered in a folded plate roofing or roofing material. Then plate nailed clout nails. At eaves roll material is wrapped under the crate is 100 mm and fixed clout nails. Skating and he curled the edges of 150 mm and pressed two planks of 25 mm and a width of 150 mm.
Roofing work using mastic starts with the preparation of wooden base. To do this, it is applied as a primer dissolved in kerosene, gasoline or solar oil bitumen in the ratio of 2: 1. The solution is made from cooled molten bitumen (at a temperature of 75-80 ° C), which is added in small portions to the solvent. The mixture is stirred until smooth and strain through a metal grid with cells of 3 mm.

It is recommended to put two coats of primer thickness of 1-2 mm each: this will provide a higher degree of cohesion of bituminous mastics with the coating material.
Before gluing the material must first be prepared: full trowel or stiff brush to clean off the grit from the bottom side, and on the top - only for docking band width of 100-150 mm. And grained mica and sand grit must be pre-treated with solvent and talc - kerosene.
Prepared by the web material spread out, cut off a piece of the desired length, then roll up and quickly cover the ground mastic roll width.
Then his foot on the surface is rolled roofing missed or only evenly pressing it, especially on the edges, on the site of the joints. For convenience, this operation is recommended to wear soft-soled shoes without heels.
Layer coating is applied parallel to the ledge below the roof. The sheets are placed overlapping with an overlap of the top row to the bottom of 100-150 mm. When the first layer of a two-layer coating is applied perpendicular to the eaves, and the second - in parallel to it.
After the roll roofing material it covers bitumastic and sprinkled with dry sifted sand.
To extend the life of roll roofing, you can double-cover with aluminum paint, mixed with bitumen paint: first brush, spray gun for the second time. Before painting, the roof must be cleaned of dirt and dust. When the first coat Paint mixture should contain 8% of aluminum powder, and for the second layer - 16%. All work must be completed no later than 3 hours after they started, otherwise the paint splits and becomes unfit for consumption.
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