Sealant for exterior works is a necessary material for sealing joints and seams, window openings (including for PVC windows), working ventilation systems, domes, greenhouses. For exterior exterior work, only those sealants that are resistant to moisture and temperature changes are suitable. Construction stores offer a choice of many different types of sealing materials.
All types of sealants, regardless of performance, perform one important mission: seal the joints, protecting the structure from moisture "under the seam." Depending on the set construction goals, a specific type of sealing material is selected:
- Acrylic sealant for wood and other contact surfaces;
- Silicone sealant for exterior work;
- Two-component material for joints and seams;
- Polyurethane sealant for exterior applications.
The choice of sealing compound is an important process. Selected construction sealant must not only be of high quality, but also meet a number of specific requirements:
- Elasticity of building and finishing materials;
- Optimum adhesion to surfaces, promoting good contact of the sealant with facade materials;
- Environmental friendliness and safety of structure;
- Simplicity and convenience in work, the ability to quickly carry out all proper manipulations;
- Availability in terms of price, the ability to choose sealant for windows, walls, joints, taking into account the color of the facades;
- Maintainability of building materials;
- Specific appearance (for example, transparent for delicate work);
Good front sealant will allow to work in any climatic conditions. Upon completion of finishing works, facade elements should not be afraid of moisture, as well as respond to temperature changes.
Silicone Sealing Features
Silicone sealants are convenient to perform the most difficult or delicate work. Silicone-filled sealants consist of plasticizers, dyes, and various additives. Despite this, the product is safe.
It is worth noting a number of features of silicone used as a basis for sealants:
- High degree of elasticity necessary for good and fast filling of gaps and seams;
- The excellent strength characteristics allowing to conduct the most difficult external works in the conditions of especially intensive operation;
- High-quality silicones are not afraid of a sudden change in temperature;
- High-quality construction sealants with a good composition have a high degree of adhesion;
- Silicone sealant is frost resistant.
It should be noted that high-quality sealant - waterproof. Choosing the material for exterior design, you can not worry about the possible difficulties associated with the compatibility of finishing paintings. Suitable silicone sealant for granite, copes well with the finishing of joints on concrete, is used to seal metal or stones, it is convenient to work with plastic windows.
For silicone sealants, some characteristic features. There are neutral and acidic species. It is better to use neutral sealant for restoration work in pools, in bathrooms or in the kitchen. A small amount of silicone compound may be needed to repair plumbing.
For exterior use acidic species. They fit well on the stone and interact with metal structures. You can also use acidic counterparts to work with wood.
The tree is characterized by those qualities that are not inherent in any other type of materials. That is why silicone compounds not only seal, but also impregnate the fabric. This allows you to maintain the appearance and performance characteristics of wood as long as possible.
It is also worth noting that the frost-resistant silicone material is not susceptible to painting or restoration. For this reason, manufacturers produce sealants for facade design in various colors. The buyer can choose the color of the material which suits him best. For example, brown color is suitable for wooden surfaces. White or transparent look is good in working with PVC windows. You can find color compositions "under the stone."
Acrylic sealants are adherents of environmentally friendly materials. There are water resistant and non water resistant species. Moisture resistant acrylic sealant for wood and other surfaces is used in work with the roof and window openings. The material is frost resistant, able to withstand low temperature loads (up to 30 degrees). Non-waterproof materials are used to fasten sedentary structures.
Acrylic sealant for wood and other surfaces has the following advantages:
- The material is often acquired by a construction company because of its simplicity and ease of operation;
- External acrylic for sealing is sold at a low price;
- Good adhesion level;
- Acrylic sealant for wood is resistant to high temperatures, does not ignite;
- Not afraid of ultraviolet radiation;
- Good for coloring. You can choose a neutral material for finishing, modifying its color or shade as needed.
However, acrylic sealant for wood and other surfaces is afraid of external temperature extremes, and also loses its sealing qualities due to the detrimental effects of moisture. Another important point: acrylic is suitable only in gaps with a disclosure of less than 15%. Otherwise delamination may occur.
In order for acrylic sealants to show their best, they need dryness and warmth. It takes about 24 hours to completely harden the sealant. The most expensive in this category are transparent formulations.
Polyurethane materials are ideal for outdoor use. Choosing which sealant to buy, so that it is combined with different surfaces, you should pay particular attention to materials with a polyurethane composition.
Working with it, you can not only work with joints or impart tightness to wide seams, but also use the material as a reliable glue that holds any parts together. The uniqueness of polyurethane sealant is that it is not only not afraid of moisture, but also grows stronger when it comes into contact with it. Today it is the best universal material for external use in especially wet regions.
Polyurethane adhesive sealant is a one-component polyurethane, which has a special elasticity. It can be chosen as a surrogate foam. One material is able to replace at least three types of building mixtures for performing various works.
Polyurethane-based sealants-adhesives are distinguished by the following outstanding characteristics:
- Reinforced adhesion, especially important for the outer web;
- The material is water resistant, from contact with moisture becomes even better;
- The mass for external sealing quickly hardens;
- Polyurethane is not afraid of UV radiation;
- Does not emit toxins and other harmful components;
- Long service life.
Frost-resistant sealant for concrete, ceramics, plastics, wood responds well to staining. Even if you use polyurethane exclusively as glue, the facade will still need to be painted, adjusting the nuances of the exterior. Moisture resistant exterior perfectly interacts with any kind of paint.
You can choose a suitable tone and make a polyurethane color finish or pick a contrasting shade that will be well combined with granite, stone, wood, will give a special appeal to metal or plastic surfaces. The most popular options are dark brown, tones of white or beige, or completely transparent sealant.
Siliconized formulations (acrylate)
If you need a frost-resistant composition and a solid waterproof base, you should choose siliconized compounds. In fact, sealant for stone, plaster, glass, wood and siding has the same characteristics as acrylic.
The strong and reliable structure perfectly transfers temperature differences, humidity, long influence of ultraviolet rays. Acrylate rubber sealants are suitable for all types of sealing: both external and internal.
A particular advantage, why it is worth choosing siliconized compounds - the ability of the composition to adapt to the deformations. The base of the seam remains tight, but rather elastic. After solidification of the mass, the surface can be painted. It is better to use latex paints. To create a colored canvas with a deep intense tone, it is better to choose a latex coloring composition.
As always, the actual colors are: dark brown, light brown, close to the beige palette, white, black. Many would prefer a transparent option that is suitable for all occasions.
Bituminous Sealant: Special Look
To repair the roof is better to choose a brown bitumen sealant. It is based on rubber and bitumen. It can be said that this is the founder of all sealants, the first product used to insulate and seal the external foundation, roof and drainage systems.
Of course, you can choose a more expensive transparent sealant. However, this is not always justified. Simple brown bitumen-based sealants can seal any web. The composition is not afraid of precipitation, the aggregates do not dissolve in the liquid.
Bituminous compositions have a high degree of elasticity. On the one hand, this is an indisputable advantage. On the other hand, it is not always acceptable to use brown in the exterior of the building, and sealant can not be subjected to staining.
What we choose should last a long time. If we seal the façade of the building and any external surfaces, the choice of sealing compounds is approached with great responsibility. In the first place should always be the performance, and only then aesthetics and the pursuit of fashionable novelties (transparent material, exclusivity, original goods on the market).