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Up roofing

Up roofing up roofing easy, economical, and when they are carried out in compliance with all technological requirements are quite reliable. These disadvantages are the small fire, a small mechanical strength and unsightly, so often they are used in the construction of commercial buildings.  

Up roofing are flexible insulating carpet that is laid dry or glued to the base using hot and cold mastic.    

Rolled roofing performed one-, two- or three-layer (usually double-layer). Tolev The roofs are made of two layers of roofing felt in tar board - the bottom layer is made of glassine paper or roofing underlayment. As a rule, this type of roofing is used on gentle slopes, the slope of which does not exceed 12 degrees.    
The base under the roof can be single- or double-layer. The latter is preferable. Single-layer solid base made of boards in the thickness 25 and width 90 — 120mm.  
The first bearing layer made of a two-layer base board thickness 25 and a width of 100 — 120 mm, packed with a gap of 45-50 mm. The second lining, made of thick planks of 15-20 mm and a width of 80-100 mm, stacked next to each other at an angle of 45 degrees to the eaves.    
In order to work with the roofing material is not rolled, it must hold a pre some time to roll out the form or rewind roll upside down.  
When dry coating web material is laid in two layers - one along the cornice, the other - perpendicular to it. Each layer on the edges nailed. Final fixing cover by using rails section 30 x 30 mm, nailed perpendicular to the eaves.  

Cover the roof of rolled material and dry method can be different. To this end, perpendicular to the eaves crate nailed bars triangular cross section 50x50 mm.  
The distance between the bars should be less than the width of the web material 100 mm. Cut advance paintings double layer stacked between the bars and nailed Tolev nails every 500mm.  
In this case, on the crest of the bar turns seam, that overlaps plate of slozhenno- half of roofing felt or roofing material. Then pad Tolev nailed nails.  
On the eaves web material is wrapped under the lath 100 mm and fixed Tolev nails. Skating and he curled edges 150 mm and pressed two boards 25 mm thick and 150 mm wide.  
  1. web material
  2. triangular bar
  3. head of the roofing material

Roofing work using mastic begins with the preparation of a wooden base. For this purpose it is applied as a primer dissolved in kerosene, gasoline or solar bitumen oil in the ratio 2: 1. A solution is prepared from the cooled molten bitumen (at a temperature no higher than 75-80 degrees), which is added in small portions to the solvent. The mixture is stirred until smooth and filtered through a metal mesh with a mesh of 3 mm. It is recommended to apply two coats of primer thickness of 1-2 mm each: so will ensure a high degree of adhesion to the bituminous mixture coating material.    

Before applying the material must first prepare: fully spatula or stiff brush to clean off posypku on the lower side and from the top - only the docking bandwidth of 100-150 mm. Moreover, coarse sand and mica Therefore it is necessary to pre-process of bulk solvent and talcum - kerosene.  
Prepared web material is spread, cut off a piece of the desired length, then roll up and quickly covered with mastic on the base width of the roll. Then the foot on the surface of the fluff rolled roofing material or roofing felt, pressing it evenly, especially at the edges, the site joints.  
For convenience, this operation is recommended to wear soft-soled shoes without heels. Single-layer coating is applied parallel to the eaves of the roof below. The sheets are placed overlapping with an overlap of the top row to the bottom of 100-150 mm. When a two-layer coating of the first layer is applied perpendicular to the eaves, and the second - of parallel to it.  
After the roofing roll material it covered with mastic asphalt and sprinkled with dry sifted sand.    
To prolong the life of roll roofing, you can double-cover with aluminum paint, mixed with bitumen varnish: the first time with a brush, spray gun for the second time.  
Before painting, the roof must be cleaned of dirt and dust. When applying the first layer of Painting mixture should contain 10% aluminum powder, while the second layer - 15%.  
All work must be completed not later than 3 hours after they begin, otherwise the paint exfoliates and becomes unfit for consumption.    

Consumption    

For single-layer roof: 1 sq. m surface of 1.2 square meters is required. m web material 30 Tolev nails, 0.3 kg of mastic, 0.8 kg of the finished paint.  
For double-layer roof: 1 sq. m surface of 2.4 square meters is required. m of web material 30 Tolevaya nails, 0.6 kg and 0.8 kg of mastic paint ready.  

cooking oil bituminous mastics    

Mastic asphalt is mixed with various kinds of fillers and plasticizers.  
The filler can be used dry wood flour, ground and sifted peat or forest moss, chopped mineral wool.  
Regardless of the type of all fillers should be finely milled, dry well and are unable to form clumps.  
From plasticizers often used spent motor oil, the volume of which in the mastic should not exceed 5%. Compared with pure molten bitumen mastics have a number of advantages: at low temperatures, they are less fragile, soften at higher temperatures provide a stronger bonding roll materials.  
Mastic is prepared in a special digester with well-fitting lids. The boiler is placed on a metal tripod that obkladyvaetsya masonry so as to obtain the firebox. Set the pot on a tripod is necessary with a slight slope to avoid sunbathing poured asphalt. With the same purpose should not be loaded in the bitumen cauldron more than 3/4 of its capacity. Mastic prepared from a mixture of bitumen grades III and V.    
To do this, the boiler is first placed pieces of low-melting bitumen grade III.
The boiler is put on the fire and stir with a wooden spatula bitumen, bring it to completely dissolve. Once on the surface of the bitumen froth will disappear, it is added in small pieces bitumen grade V and adjusted the temperature of the entire mass of up to 200 degrees.    
In no case should not be allowed to overheat mastic, since at higher temperatures it loses its quality.  
Mastic is considered ready when it stops foaming and surface becomes glassy. Thereafter it in small portions poured on heated iron sheet filler, melt stir constantly. The next portion of the filler is filled only after the foam shall fade. Then paste added a plasticizer, and again thoroughly mixed.  
When applying the mastic to the surface it cools down very quickly, so it must be used immediately after preparation, without letting it cool down below 120 degrees.

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