The situation of a roof leaking in a garage is familiar to many car owners, especially after prolonged rains or snow melting. Ignoring this problem can lead to catastrophic consequences for the car stored inside and the structure itself. Moisture contributes to the development of corrosion on the body of the machine, rotting of metal elements of the structure and damage to the property lying on the shelves.
External repairs are often more effective and durable than trying to put buckets inside or seal the ceiling from the inside. Sealing out Allows you to completely block the access of water to the inner layers of the roof. In this article, we will discuss in detail how to seal the roof, what materials are better suited for different types of coatings and how to carry out work with your own hands without the involvement of expensive crews.
Before proceeding to active actions, it is necessary to conduct a thorough diagnosis of the surface. Often, a visual inspection from the ground does not give a complete picture, so you will need to climb on the roof. It is important to determine not only the place of leakage, but also the cause of its occurrence, so that repairs do not have to be repeated through the season.
Diagnosis of damage and search for leaks
Finding the source of water supply is the first and most important step. Water can flow in one place, and drip inside completely in another, moving through the elements of the structure. If the roof in the garage leaks, the most common problem lies in the violation of integrity. waterproofing Or microcracks in concrete.
Carefully inspect the surface for swelling, tears or detachments of the material. On metal roofs, look for rust foci that could have turned into through holes. Pay special attention to the places of adjoining the roof to the walls, ventilation pipes and drains, since it is there that gaps are most often formed.
⚠️ Warning: When working at height, be sure to use a safety rope and a stable ladder. Slippery from moisture or moss roof surface is a serious danger to life.
For accurate definition of cracks in concrete floors sometimes it is necessary to remove the layer of old ruberoid. If the roof is flat, water can accumulate in the lowlands, forming so-called "lakes" that gradually break down the coating. Removing these irregularities is also part of the preparatory phase.
Preparation of surface for repair
The quality and durability of repairs directly depend on how carefully the surface was prepared. No, not even the most expensive. sealant or mastic, will not be kept on a dirty, wet or dusty base. Preparation takes up to 70% of the time of the whole process, but it should not be neglected.
First of all, it is necessary to clean the roof from debris, fallen foliage, sand and dirt. This can be done with a hard brush, broomstick or a powerful stream of water from the hose. If there is moss or mold on the surface, they must be cleaned mechanically and treated with an antiseptic to prevent reappearance.
☑️ Checklist for roof preparation
After cleaning, the surface should be completely dry. If you plan to use bitumen materials, base moisture is not acceptable. Metal elements should be cleaned from rust to shine and treated with a rust converter. Cracks in the concrete must be embroidered, removing the crumbled edges, so that the repair staff penetrated deep.
For degreasing metal and concrete surfaces, Kalosha gasoline or a special degreasing agent is excellent. Rub the surface with rags, moving from the edges to the center of the damaged area. Only after the degreasing agent is completely dry can you start applying the basic materials.
Review of materials for sealing the roof
The construction materials market offers many solutions for the question of “what to fix the roof”. The choice depends on the type of roof, budget and desired repair life. Modern. polymeric And liquid rubbers often outperform traditional methods for ease of application and elasticity.
Bitumen mastics remain classics of the genre. They are cold (ready to use) and hot (requiring heating). Cold mastics are convenient for local repair, as they do not require special equipment. Hot bitumen provides a more reliable grip, but handling it requires caution due to the high temperature.
| Materials | Basis | Duration of service (years) | Features |
|---|---|---|---|
| Bitumen mastic | Bitumen and polymers | 5-7 | Low price, requires drying |
| Liquid rubber | Polymer emulsion | 10-15 | High elasticity, seamlessness |
| Polyurethane sealant | Polyurethane | 10-12 | UV resistance, adhesion to everything |
| Acrylic compounds | Water emulsion | 3-5 | Environmentally friendly, only for small movements |
Polyurethane sealants and mastics based on MS polymers They are considered to be among the most reliable. They do not flow in the heat, do not crack in the cold and perfectly hold on any surfaces, including moist concrete. Their only disadvantage is a higher cost compared to bitumen analogues.
Liquid rubber forms a monolithic coating that repeats all the curves of the roof. This is ideal for complex surfaces with many pipes and protrusions. The material is applied by spraying or brush, creating a seamless membrane that completely eliminates leaks.
When choosing a material, pay attention to the temperature of its application. Many formulations can not be applied at temperatures below +5 ° C, which limits the timing of work in spring and autumn.
Technology of repair of bitumen materials
If you decide to use a bitumen mastic or ruberoid, it is important to follow the application technology. To begin with, a primer (grounder) is applied to the prepared surface. It improves adhesion and binds the remains of dust. The primer will dry for several hours, after which you can start the main work.
Mastic is applied with a spatula, brush or roller. When working with cracks, it is recommended to use a reinforcement mesh (glass fabric). First, a layer of mastic is applied, then the net is laid and rolled with a roller, after which the finish layer is applied. This creates a durable “cake” that will not allow the crack to break apart again.
If a roll material is used, it must be heated with a gas burner until the characteristic shine and light smoke appear. The roll roll rolls, pressing tightly to the base. The cover of the strips should be at least 10-15 cm. Places of joints are necessarily smeared with mastic for additional tightness.
⚠️ Warning: When working with open fire and bitumen, strictly observe fire safety rules. Have a fire extinguisher or sand on hand, especially if there are flammable objects nearby.
Pay special attention to the places of adjoining the roof to vertical walls. There, the bitumen carpet should be raised to the wall to a height of 20-30 cm. To fix the edge, you can use a pressing bar or simply carefully smear with mastic with reinforcement.
The main rule of bitumen repair: cleanliness, dryness and the mandatory use of the primer for reliable adhesion of materials to the base.
Use of modern polymeric compositions
Modern polyurethane and acrylic compounds allow repairing the roof of the garage much faster and cleaner. They do not require heating, are fire-safe and often water-based, making it easier to clean the tool. Such materials are often called “liquid roofing”.
Polyurethane sealants are sold in tubes under a gun or in buckets. For sealing seams and cracks, the option in tubes is ideal. The tube's nose is cut at an angle of 45 degrees, and the composition is squeezed directly into the crack. Due to its viscosity, it does not drain even from vertical surfaces.
If the area of damage is large, it is more convenient to use compounds in buckets that are applied with a wide brush or roller. They create an elastic film that stretches under temperature deformations of the roof. This is especially true for metal garages that expand heavily in the sun and shrink in the cold.
The secret of polymer durability
Two-component formulations: Some professional polyurethane mastics consist of two components that are mixed before application. After mixing, a chemical curing reaction begins, and the material becomes super-strong. Work with such mixtures should be fast, since the life time of the finished composition is limited to 30-40 minutes.
Although there are moisture-curing options, it is still better to work in dry weather. Sunlight often speeds up polymerization, but too much heat can cause the top layer to dry out too quickly.
Repair of joints, seams and abutments
The joints between the floor slabs and the place of the roof adjoining the walls are critical risk areas. This is where the roof in the garage flows most often. For sealing these zones, conventional solutions are not suitable, since they are rigid and crack when moving the building.
The best solution for seams is thiokol or polyurethane sealants. They have a high adhesion to concrete and metal, and also retain elasticity for decades. Before filling the seam, it is recommended to expand and clean it, and then, with deep damage, lay a sealing harness (vilater) there.
A sealant is applied over the sealant. Its surface can be leveled with a spatula dipped in a soapy solution so that the material does not stick to the tool. For places where strong movements are possible, it is recommended to use the technology of "three sides": the sealant should contact only the two walls of the seam and the bottom, but not stick to the ends in order to be able to stretch freely.
If we are talking about adjoining a brick wall, the ideal option would be to create a flyover from a rolled material with a rise on the wall, pressed by a metal bar. The bar is fixed with dowels, and the upper edge of the bar is also smeared with a sealant so that the water does not flow under the metal.
For joints and joints, use only elastic sealants. Cement mortars and hard plaster in these places will quickly collapse.
Frequent mistakes in self-repair
Many garage owners, trying to save money, make mistakes that negate all efforts. One of the most common is the application of a new layer of material over the old, destroyed and swollen coating. This creates a “layer cake” in which moisture continues to walk, and after a short time, the new layer will also fall off.
Another mistake is ignoring surface preparation. Trying to seal a hole on a wet or dusty roof is doomed to failure. Water under pressure steam will simply tear the patch, and the dust will not allow the material to stick. Also often forget about the reinforcement of cracks, applying the sealant with a thin layer, which breaks when the seam expands.
The wrong season for repairs also plays a role. Trying to seal the roof with bitumen in the rain or in severe frost will lead to the fact that the material will not catch. Bitumen mastics require heat, and some polymeric compounds do not harden at low temperatures.
⚠️ Note: Do not use mounting foam as the main waterproofing material. The foam is hygroscopic (absorbs moisture) and is destroyed by ultraviolet radiation. It can only be used as a filler for large holes, but always with subsequent protection with a sealant or mastic.
Prevention and care of the roof of the garage
To the question “the roof in the garage is running what to fix” does not rise every summer, you need to regularly care for the coverage. It is enough to climb the roof one or two times a year (in spring and autumn) and conduct an audit. Timely removal of garbage and cleaning of drains will prevent water stagnation.
If you notice a small crack or bloating, remove them immediately. Repairing a small defect will take 15 minutes and cost a penny, while restoring a rotten roof will require capital investment. Regular painting of metal elements with anticorrosion compounds will also prolong the life of the roof.
For concrete roofs, it is good practice to apply a protective layer of “liquid rubber” or special waterproofing paint every 5-7 years. This will update the protective layer and close the microcracks that could appear during operation.
Can I fix the roof of the garage in winter?
It is not recommended to repair the roof in winter. Most waterproofing materials (bitumen, mastics, sealants) require temperatures above +5°C for proper application and polymerization. In the cold, the materials become brittle, do not stick to the base or dry. The water in the cracks freezes, preventing the penetration of the repair staff. The exception is special all-season sealants on a polyurethane basis, but they are better applied on a dry, sunny winter day at a temperature of not lower than -10 ° C.
Which is better: a ruberoid or a modern membrane?
Ruberoid is a classic, cheap material, but it lasts only 3-5 years, cracks in the cold and requires heating with a burner during installation. Modern polymer membranes (liquid rubber, polyurethane) serve 10-15 years or more, do not require open fire, are applied with a brush and have high elasticity. If you do for yourself and want to forget about leaks for a long time, it is better to choose modern materials, despite their higher initial cost.
Why is it running in the corner of the garage?
Leaks in the corners of the garage are most often associated with a violation of the tightness of the joint between the wall and the roof (gallet). In this place, water, snow and debris often accumulate. If the drainage system is clogged or the roof slope is insufficient, water stagnates in the corners and gradually penetrates through microcracks. Also, the reason may be the lack of overhang of roofing material on the wall.
Do I need to remove an old ruberoid before a new one?
Ideally, yes, you should shoot. An old ruberoid can hide moisture that will destroy the new layer. However, if the old layer lies flat, not swelled and firmly held, it is allowed to apply a new layer on top of it after careful cleaning and priming. But if the old material crumbles or has multiple tears, it must be dismantled to the ground.