Flat roofing of residential and industrial buildings requires reliable waterproofing, capable of withstanding the aggressive effects of precipitation and temperature changes. One of the most popular materials for this purpose is glass-glassIt combines affordable cost and high performance. Its installation by fusing with a gas burner allows you to create a monolithic, seamless coating that excludes leaks even in areas adjacent to vertical structures.
The installation process requires strict compliance with temperature regimes and base preparation technologies, since the quality of heating of the bitumen mixture depends on the adhesion of the material. Incorrect heating can lead to either insufficient grip or to burning the base, which will negate all efforts. In this article, we’ll take a detailed look at every step of the way, from tool selection to final seam inspection, to keep your roof dry for decades.
Many craftsmen prefer to use this roll material due to its elasticity and resistance to rot. The fiberglass base is not subject to corrosion and perfectly tolerates mechanical loads arising from the thermal expansion of the building. Well done glass-laying turns the roof into a reliable shield that protects the internal structures from moisture.
Material characteristics and choice of marking
Glassloisol is a rolled bitumen-polymer material, the basis of which is glass fiber or fiberglass. Both sides of the base are covered with high-quality bitumen binder containing modifying additives that increase heat resistance and elasticity. To protect against adhesion during storage, the bottom layer is sprinkled with fine fractional crumb or covered with a polymer film that melts when heated.
When choosing a material for the roof, it is critically important to pay attention to the marking, since there is a division into lining and roofing modifications. Marking "K" indicates that the material is intended for the upper layer and has a protective sprinkle of slate or coarse-grained granulate. These products are resistant to ultraviolet light and mechanical damage, which makes them ideal for finishing.
- 🏷️ TB-4.5 - roofing material based on fiberglass with coarse-grained sprinkle, is characterized by high tensile strength.
- 🏷️ HCP-4.0 - an economical option based on glass canvas, suitable for the upper layer, provided that the installation is accurate.
- 🏷️ TPP-3.0 - a lining material without top sprinkling, used exclusively for the lower layers of the pie or waterproofing foundations.
The lining variants, denoted by the letter "P", do not have a protective sprinkle on top and are often covered with a light-melting film. Their main task is to create an additional sealing layer and level the surface. The use of lining glassisol as a finishing coating is unacceptable, since the bitumen layer will quickly collapse under the influence of sunlight.
⚠️ Note: Do not try to save money by using the backing material as the finish layer. The service life of such a coating will be no more than one season, after which expensive repairs of the entire roof will be required.
The choice of a specific brand depends on the type of roof design and the planned loads. For residential buildings, a two-layer system is most often used, where the lower layer is made of a thicker and more elastic material, and the upper one is resistant to external factors. The correct selection of components ensures the durability of the entire roofing system.
Essential tools and remedies
High-quality installation of glassizole is impossible without a specialized tool that allows you to evenly warm the bitumen layer. The main working element is a gas burner connected to a propane cylinder through a gearbox and a hose. It is important to use proper equipment as a gas leak or unstable flame can lead to a defect in work or a fire hazard situation.
In addition to the main heating element, a number of auxiliary devices will be required for surface preparation and cutting of the material. Roofing knife with a hooked blade allows you to quickly cut rolls without removing them completely, as well as cut the excess in the areas of overhang. For rolling the material, a special roofing rink or a metal roller with a handle is used, which ensures a tight fit of the canvas to the base.
☑️ Roofer's setup
Safety when working with open fire and hot bitumen is in the first place. The flame temperature reaches several hundred degrees, and the molten bitumen sticks to the skin and causes severe burns. Therefore, the use of personal protective equipment is a requirement, not a recommendation.
- 🔥 Fireproof gloves Protect your hands from burns when working with hot material and tools.
- 👢 Special shoes - shoes with a non-slip sole and a high tib for protection from bitumen splashes.
- 👖 Tight workwear A fire-resistant fabric suit that covers all parts of the body.
It is also necessary to prepare a building dryer for drying hard-to-reach places and a primer for priming the base. A primer is a solution of bitumen in an organic solvent that is applied to concrete or screed to improve adhesion. Without a high-quality primer, the adhesion of glassizole with porous concrete will not be strong enough.
Preparation of the base and application of the primer
The fundamental stage that determines the durability of the roof is the preparation of the surface. The base should be dry, clean and even. The presence of moisture under the waterproofing layer will lead to the formation of steam during heating, which will cause swelling of the material and the formation of bubbles. Therefore, before starting work, it is necessary to carefully check the moisture of the screed.
All irregularities, bumps and sharp protrusions should be eliminated, as they can damage the integrity of the canvas during walking or during operation. Cracks and joints between plates are sealed with repair compounds or sealants. Dust and fine debris are removed with a broomstick, and if necessary, the surface is blown with compressed air.
Check the humidity of the base can be a simple folk method: glue a piece of polyethylene 1x1 meter on the tape around the perimeter. If after 4 hours under the film appeared condensate or concrete darkened, drying should continue.
After cleaning and repairing the surface, a primer is applied. This step is often ignored by beginners, considering it an unnecessary waste of time, but it is the primer that binds the residual dust and penetrates the pores of concrete, creating a monolithic structure. Apply primer can be brush, roller or sprayer, achieving uniform coverage without skips.
The drying time of the primer depends on weather conditions and air temperature, but is usually between 2 and 24 hours. The surface readiness is checked as follows: a dry napkin is applied to it, and if there are no traces of bitumen on it, you can proceed to melting. Wet or sticky primer will cause detachment of waterproofing.
| Parameter | Basis requirement | Control tool |
|---|---|---|
| Humidity | No more than 4-5% (dry) | Moisture gauge or film test |
| Smoothness | The differences between not more than 5 mm and 2 m | Two-metre rule |
| Cleanliness | Lack of dust, oil, dirt | Visual examination |
| Strength | No loose areas | Metal spatula |
Technology of opening and preliminary fitting
Before you pick up the burner, you need to make a cutting of the material and a preliminary layout on the roof. This allows you to avoid distortions and accurately calculate the number of overhangs. Rolls roll on the surface, taking into account the direction of the water flow, leaving the necessary allowances on the side and end joints.
Standard side cover is 8-10 cm, and end cover - 15 cm. These values ensure reliable sealing of seams and prevent water from flowing under the coating. When cutting, it is important to use a sharp knife so as not to crumple the edges of the material, which can make it difficult to weld the seams later.
Nuances of work in the cold season
In winter, bitumen becomes fragile, so cutting and laying glassisol should be done with extreme caution. The material is recommended to be pre-storaged in a warm room (at least 24 hours) so that it becomes elastic. Work at temperatures below -10 ° C is not recommended, since adhesion is significantly reduced.
If the roof has a complex configuration with pipes, ventilation channels or parapets, cutting is made taking into account the circumvention of these elements. Allowances are left around vertical structures, which will subsequently be raised vertically and fixed mechanically or fused. Accuracy of cutting at this stage will save time and material in the soldering process.
After pre-laying, the rolls are rolled again from one end to free up the surface for melting. It is necessary to twist carefully, avoiding cracks and displacement of the axes, so that when rerolling the material falls exactly in its place. This is especially important when working with long canvases, where it is difficult to visually control the line of the joint.
The burner-melting process
The most important stage is the direct melting of glassizole. The technology requires simultaneous heating of the base and the lower surface of the material. The flame of the burner is directed so that it melts the bitumen layer of the roll and the base section in front of it, creating a small roller of molten bitumen 1-2 cm high.
The master moves progressively, rolling the roll and pressing it with a rink. Movements should be smooth, without jerks, so that the bitumen is evenly distributed under the canvas. A sign of proper warming is the protrusion of a bitumen mixture from under the side edges of about 2 cm wide. If the bitumen does not protrude, then the warming is insufficient, and there will be no adhesion.
- 🔥 Uniformity Keep the burner at a constant distance from the surface, avoiding local overheating.
- 👣 Controlling - watch the roller of bitumen, it should be continuous along the entire length of the seam.
- 🚶 Techniques - You can step only on the cooled material, preferably in soft shoes or through boardwalk.
Particular attention is paid to the places of overflow. The lateral joints are warmed up especially carefully, since it is through them that leaks most often occur. After rolling the seam, it is recommended to walk along it with a spatula, pressing the edges for guaranteed clutch. End overlaps are performed in a similar way, with mandatory heating of the lower part of the upper sheet and the upper part of the lower.
High-quality moulded material cannot be removed from the base without breaking the glassisol itself. If the canvas departs with a characteristic sound and leaves the base clean - the technology is broken.
When working with a burner, it is important not to overheat the material, especially if the basis is a thin glass canvas. Excessive heating leads to burnout of the reinforcing layer and loss of strength. Experienced roofers adjust the intensity of the flame depending on the speed of movement and ambient temperature.
The design of the adjoining and adjoining units
The nodes adjacent to the parapets, walls and ventilation shafts are the most vulnerable places of the roof. Here, waterproofing must be performed with extreme care, often in two layers using additional elements. First, the main carpet is fused, then a vertical surface is approached.
For the design of adjoining often used method of "crutches" or triangular bars, which are installed in the corner between the horizontal and vertical plane. This allows you to avoid fracture of the canvas at right angles, which could lead to its rupture under temperature deformations. The bar smooths the angle, making the transition smooth.
⚠️ Warning: Never leave the vertical edge of glassisol simply pressed with metal without melting. The bitumen must be welded to a vertical surface along the entire height of approach (at least 25 cm) so that water cannot leak under the carpet.
The upper edge of the material on the vertical is fixed by a metal clamping bar with a step of attachment not more than 200 mm. The seam between the bar and the wall is necessarily sealed with a thiocol or polyurethane sealant. This design provides reliable protection from oblique rain and wind.
The holes of the appropriate diameter shall be cut around the pipes and ventilation ducts. The edges of the hole and the pipe itself are thoroughly cleaned and ground. A special skirt is put on the pipe or a glassizole cuff is cut out, which is fused from the bottom up, blocking the joint with the main carpet. All seams are additionally smeared with bitumen mastic for a one hundred percent guarantee.
Quality control and typical errors
After completion of the work, it is necessary to conduct a visual inspection of the entire roof surface. It should not be swelling, wrinkles, unmelted areas or ruptures. Special attention is paid to the seams: they should be smooth, with a clearly visible roller of the bitumen. Any defects must be repaired immediately before the material has cooled completely.
One of the common mistakes is laying on a wet base. The water remaining in the pores of concrete, when heated, turns into steam and tears the material from the screed, forming characteristic bubbles. Correction of such a defect requires opening the bubble, drying and installing a patch, which is time-consuming and not always effective.
Another common mistake is insufficient heating of the seams. Visually, the seam may appear whole, but when mechanically exposed or snow melts in spring, water will find a microscopic channel and penetrate the coating. Therefore, the rule of “acting bitumen” must be strictly observed.
- ❌ Overheating - leads to the destruction of the structure of bitumen and the appearance of holes in the canvas.
- ❌ Walking on fresh material - deforms the coating and leaves traces that violate waterproofing.
- ❌ Lack of primer - reduces adhesion at times, making the coating vulnerable to wind loads.
Compliance with technology and the use of high-quality materials allow you to create a roof that will last more than 20 years without major repairs. Glassloisol has proven itself as a reliable and economical option, but only under the condition of a professional approach to installation. Don’t skimp on preparation and tools to make the result enjoyable for years to come.
Can I put glassisol in the rain?
Absolutely not. Moisture that gets between the layers of bitumen or under the material, when heated, will turn into steam, which will lead to swelling and detachment of the coating. In addition, the wet base cannot be properly warmed and sooted. Work should be carried out only in dry weather.
How many layers of glass is needed for a residential roof?
For flat roofing of a residential building, a two-layer coating is usually recommended. The lower layer (3-4 mm) creates the main waterproofing membrane, and the upper (4-5 mm) with a protective sprinkle protects against ultraviolet light and mechanical damage. In some climate zones, a three-layer cake is allowed.
What is the difference between glassysol and ruberoid?
The main difference is in the basis. The ruberoid is based on cardboard, which is subject to rotting and soaking. Glassloisol is made on the basis of fiberglass (glass fiber or fiberglass), which does not rot, has greater tensile strength and lasts 2-3 times longer.
Do I need to clean the roof of the old roof?
If the old coating (ruberoid or glassisol) is held firmly, does not have swelling and tears, it can not be completely dismantled. It is enough to remove the bubbles, fix the cracks and lay a new layer on top of the old one. This will save time and money, but will increase the load on the roof structure.