Improper heating with a burner is the most common cause of swelling and detachment of the roofing carpet in the first season of operation. To avoid expensive repairs, it is necessary to strictly observe the temperature regime of melting of the bitumen layer when laying rolled materials based on fiberglass. bicrosth belongs to the class of economy, and its asphalt impregnation requires careful handling: insufficient heating will not give adhesion, and excessive will lead to burnout of the base and loss of elasticity.
The melting process requires preparation of the base and compliance with weather conditions, since the humidity of the surface directly affects the adhesion. If you ignore the priming or laying on a wet base, moisture will remain under the carpet, which, when heated, will turn into steam and tear the material. The right technology means using primer for dusting and improving adhesion, which is especially critical for concrete and cement-sand screeds.
⚠️ Attention: It is strictly forbidden to fuse the material on the base, which has visible bubbles, cracks or bloating of the old coating. First, the base needs to be repaired.
Preparatory work and choice of toolThe success of installation depends on the quality of surface preparation and the availability of specialized tools for 80% of installation. The basis for roofing It should be dry, clean and smooth. All protruding elements, sharp edges and irregularities should be eliminated, as they can damage the integrity of the canvas during rolling or during operation under a load of snow.
To work, you will need a gas burner with piezoporzig, a propane cylinder, a roofing knife, a spatula for rolling and a roller for applying a primer. Particular attention should be paid to the choice of the burner: it should provide a uniform flame without sharp emissions, so as not to burn through. glass-line Or glass fabric. Before the start of work, the serviceability of the gearbox and hoses is checked for gas leaks.
⚠️ Note: Floating can only be carried out at ambient temperatures not lower than -10°C, although the optimal range is from +5°C to +25°C.
☑️ Installation tools
Calculation of the amount of material and selection of the type of BikrostBefore purchasing, you need to accurately calculate the roof area, adding a stock for overhangs and trimming in difficult places. bicrosth Available in rolls of standard width of 1 meter and length of 10 or 15 meters depending on the thickness. It is important to consider that when laid in two layers (which is recommended for reliability), the material consumption doubles, plus the cost of lower and upper coating types is added.
For the lower layer, a material with or without fine-grained sprinkle is usually used (marked as PP or P.), as it is completely hidden. For the upper layer, a material with a protective sprinkle of slate, granulate or foil is required (marking) K), which protects bitumen from ultraviolet radiation. Using the material without sprinkling as the finishing layer will cause it to collapse rapidly under the sun.
Formula for calculating material
The roof area is multiplied by 1.1 (10% of the stock). If you put in two layers, the result is multiplied by 2. The crosshairs are 10-15 cm long, 8-10 cm wide.
Technology of preparation of the base for meltingQualitative preparation of concrete or wooden base is a key step in ensuring the durability of the roof. The surface is cleaned of debris, dust and dirt, after which it is checked for moisture. To do this, you can use a simple method: glue a piece of polyethylene for a day; if condensate appears under it, drying must be continued.
The next step is to apply a bitumen primer. It is a liquid solution of bitumen in an organic solvent that penetrates the pores of concrete, binds the dust and creates a sticky film. Apply primer It should be evenly, preventing the formation of puddles, and allow it to dry completely (usually 2-4 hours) until the stickiness disappears.
- 🔨 Removal of all sharp ledges and bumps on the screed.
- 🧹 Careful cleaning of the surface from dust and construction debris.
- 💧 Check the humidity of the base before starting work.
- 🖌️ Applying the primer in one or two layers depending on the porosity.
Step-by-step instructions for melting BikrostThe laying process begins at the bottom of the roof, moving from the bottom up the slope. The roll is rolled out for fitting, then rolled back to the center. Using a gas burner, the master warms up both the surface of the base and the lower part of the roll until the characteristic shine of the molten bitumen appears.
When the material is heated, it begins to roll slowly, pressing to the base. It is important not to step on a newly laid canvas, so as not to deform it. The next strip is laid with a lateral overlap of 8-10 cm, where the protective film or sprinkle at the joint is previously removed to ensure the monolithicity of the seam.
When warming up, direct the flame of the burner with a fan, covering the edge of the roll and the base in front of it. Do not keep the fire in one spot for long so as not to burn through the base.
Table of characteristics of different types of Bicrost:
| Type of material | Basis | Protective layer | Appointment |
|---|---|---|---|
| Bicrost of SPT | Glass canvas | Film/Film | The bottom layer |
| CCI bicrot | Glasswork | Film/Film | Lower layer (strong) |
| Bicrost CCP | Glass canvas | Baby/Film | Top layer |
| TSP bicrot | Glasswork | Baby/Film | Top layer (strong) |
Design of adjoining and complex nodesThe most vulnerable places of the roof are adjacent to vertical surfaces, ventilation pipes and parapets. Special care and the use of additional materials are required. For sealing corners are often used galtels - triangular slats or cement mortar, laid in the corner of the junction of the wall and roof at 45 degrees. This avoids the clutter. The material is rolled and provides a smooth transition.
Installation in these zones is carried out with the material twisted on a vertical surface of at least 25-30 cm. The upper part of the adjoinment is necessarily pressed with a metal pressing bar and sealed with a roof sealant. Ignoring this stage leads to water flowing under the carpet in oblique rain or snow melting.
⚠️ Attention: When designing end (internal corners) laying is made first of all, with an additional waterproofing gasket with a width of at least 50 cm.
Frequent errors in installation and their consequencesOne common mistake is saving on a primer or applying it to a dusty surface. As a result, bitumen does not stick to concrete, but only adheres to dust, which leads to the sliding of the carpet or the formation of air bubbles. Also, there is often poor heating of the joints, which forms bridges of cold and paths for moisture penetration.
⚠️ Attention: When designing end (internal corners) laying is made first of all, with an additional waterproofing gasket with a width of at least 50 cm.
Another critical mistake is the stacking of the material in the tension. Heat-up bitumen It expands and when it cools, it shrinks. If the roll has been stacked with tension, when cooling it will pull and break off from the base or burst. The material should lie freely, without forced stretching.
The main rule: high-quality heating of joints and the absence of tension of the fabric guarantee the absence of leaks throughout the entire service life.
Can I put Bikrost on an old ruberoid roof?
Technically, this is possible if the old coating is firmly held, does not have bloating and rot. However, the surface still needs to be cleaned of debris and thoroughly warmed before the new layer is melted. It is better to remove the old layer for inspection of the state of the screed.
How many layers of Bikrost do you need for a reliable roof?
For garages and outbuildings, one layer of high-quality material (for example, Technoelast) is often enough, but for Bikrost, as an economy class material, a two-layer laying is recommended: lower lining and upper with sprinkling.
At what temperature can I work with Bikrost?
The optimum air temperature is from +5 ° C to +25 ° C. At negative temperatures, the material becomes rigid, it is difficult to roll without cracks, and bitumen cools faster, which worsens adhesion. In winter, special skill and preliminary heating of the roll is required.
Do I need to sprinkle Bikrost on top?
If you use a material labeled "P" (film) as the top layer, it must be protected from UV rays, for example, stained with silver or covered with gravel. Material labeled "K" (baby) in additional sprinkling does not need.