Not a single wooden structure is insured against the appearance of cracks, cracks and gaps, no matter how high quality it is. Any wood is subject to shrinkage, to a greater or lesser extent, and it is impossible to completely exclude this natural process, even with the help of modern technologies. But it is not at all difficult to eliminate the defects that have arisen if you choose the right sealant for wood.
Sealing and insulation
The area of application of sealants is quite extensive: log houses, rafter systems, window and door frames, floor coverings, stairs, exterior and interior decoration. Operating conditions differ in each case, but there are several general requirements that sealants must meet:
The finished facade of a log house
If a sealant is used to seal cracks and chips in decorative sheathing, it must still be and imperceptible, that is, the color of the tree.
Wood sealants can be painted in characteristic colors
Sealant application diagram
Not all sealants meet these requirements, especially in terms of adhesion and elasticity. Some compounds do not adhere well to a porous surface, and at the first temperature compression-expansion of the material they lag behind the wood, leaving open joints. The same happens when using polyurethane foam and putty, which are intended only for static connections. In order not to be mistaken when choosing, you should better familiarize yourself with the types of sealants, their composition and main characteristics.
It is important to choose the right sealant
Sealants are divided into types by purpose and composition. First of all, there are household and professional sealants that differ in price, ease of use, and operating conditions. Professional products are not only more expensive, but also require certain skills in use, so it is impractical for home craftsmen to use them. In the production of household sealants, the emphasis is on ease of use and reliability of the result in standard conditions, and a beginner can cope with them. Most manufacturers indicate whether the sealant is intended for industrial or domestic use, so read the label carefully.
Any sealant contains fillers, polymer composition, hardeners and additional components that improve the properties of the material. Depending on the type of polymer used, they are divided into silicone, acrylic, polyurethane, bituminous and thiokol, but the first three are most often used for wood.
Silicone compounds are acidic and neutral. The former contain acetic acid, and when hardened, they emit a strong characteristic odor. Acidic sealants are universal, have a low cost and are widely used in construction and repair work.
True, they are incompatible with non-ferrous metals, natural marble and alkali-containing materials. But for a tree, they are great. Neutral sealants are made on the basis of ketoxime or alcohol, so they can be used on absolutely any substrate. In terms of cost, they are more expensive than acid ones, although not by much. The general characteristics of silicone compounds are quite high: they are considered very durable (20-25 years), are excellent for both outdoor and indoor use, and are water-repellent.
After hardening, these sealants retain their elasticity, withstand temperature changes, and are not subject to weathering.
Sealant for wooden housing construction BARTON'S "Warm House"
The hardened layer has one more feature: no paint sticks to it, nor repeated layers of the same sealant. That is, in the event of a repair, it will not be possible to eliminate minor damage by spot application of a new composition, you will have to completely remove everything and seal again. As for painting, this problem is solved by purchasing colored sealants, the lines of which are available from almost every manufacturer. Most often, silicone compounds are used in the treatment of window and door frames, platbands and slopes, external railings, when sealing the slots of the rafter system.
|Cure time||from 6 to 12 hours|
|Lifetime||3 years outdoor, 20-25 indoor|
|Application temperature||+ 5… + 40 ° C|
|Curing shrinkage||up to 15%|
|Density||1-1.2 kg / l| Silicone sealant
Polyurethane compounds are the strongest and most durable, but at the same time the most expensive. They have excellent adhesion to most building materials, withstand heavy mechanical stress, and have the highest elasticity among sealants. They are not afraid of water, weak acids and alkalis, give reliable results even when applied to a damp surface. Another advantage of polyurethane sealants is the absence of shrinkage after polymerization, which makes it possible to accurately calculate the required amount of material for processing.
One-component, low modulus polyurethane sealant
These formulations are suitable for indoor and outdoor use, convenient and easy to apply, they can be painted after hardening.Due to its excellent adhesion, polyurethane sealant is often used when repairing silicone sealant joints when other materials do not stick to them.
House in the process of being treated with a sealant
As for the disadvantages: in addition to the high cost, they include poor color gamut and poor resistance to exposure to ultraviolet radiation. As a rule, this type of sealant is used when processing the joints of door and window frames with walls, in roofing structures, at the corner joints of interior walls.
|Polymerization time||8 -12 hours|
|Lifetime||Up to 15 years outdoor use, 25 to 40 indoor|
|Temperature range Operation|| -60. |
.. +120 ° C
|Application temperature||-20 to + 40 ° C|
|Density||1.2 kg / l| Polyurethane sealant
Acrylic wood sealant
Acrylic based sealant for wood are used most often. They are inexpensive, easy to apply, adhere perfectly to porous and fibrous surfaces, and treated seams are easy to paint later.
Acrylic compounds do not contain solvents and toxic components, therefore they are environmentally friendly.
Wepost Wood acrylic sealant for wooden houses
Conventional acrylic sealants are noticeably inferior to silicone in terms of water resistance and elasticity. With a sharp temperature drop or constant contact with water, they begin to flake off and can no longer perform protective functions, and therefore they are most often used indoors with low humidity. For outdoor use and wet rooms, water-resistant acrylic compounds with the addition of silicone or latex are available. Acrylic-silicone sealants combine the best qualities of both materials: they are absolutely water-resistant, adhere perfectly to any surfaces, almost do not shrink after curing, and have excellent elasticity.
Neomid Warm House Wood Professional Plus, sealant for wood
It is these compounds that are used for sealing inter-crown seams of log cabins, processing external joints along the perimeter of openings, sealing cracks in sheathing boards and other problem areas subject to shrinkage and temperature deformations. An additional advantage is the wide range of shades.
Table. Popular brands of acrylic sealants.
| The main purpose is to seal large joints (from 2. |
5 cm). Suitable for external and internal surfaces, can be applied to fresh wood.The sealant has high elasticity, which is maintained throughout the entire service life, the color range includes about 10 different shades. It is applied at a temperature of + 5 ..
. +32 ° C, setting occurs within 2 hours, for full polymerization it takes from 2 to 8 weeks, depending on environmental conditions. The material is packed in tubes of 325 ml and plastic buckets of 19 liters. With an application thickness of 4 mm and a joint width of 2 cm, the consumption of sealant is 19 liters per 150 running meters
| Acrylic, water-soluble sealant available for narrow joints (up to 2.5 cm). |
After curing, it can withstand deformations up to 150% of the initial parameters. Suitable for use in the most unfavorable climatic conditions. Has resistance to fading, durability, vapor permeability. It is applied at +5 ..
. +30, the setting time is 120 minutes, for full hardening it takes up to 4-8 weeks. Consumption is 19 liters for 300-350 linear meters. meters, packing - 19 l bucket, 325 ml tube
Remmers Acryl 100
| German-made acrylic sealant designed for joints up to 5 cm wide. It has excellent resistance to compressive and tensile loads, high adhesion, UV resistance and retains these properties for 20-25 years.
The color range includes 11 warm and neutral shades. It is applied at a temperature of + 15 ... + 45 ° C, setting occurs within 120 minutes, complete drying - 7 days.
| Acrylic-based compound, intended for sealing cracks and cracks in various types of wood. After hardening, it acquires high elasticity (up to 200%), resistance to ultraviolet light, temperature changes (from -50 ° C to + 70 ° C), abrasion. The service life is about 20 years. The sealant is very convenient to apply, it allows you to form beautiful seams of various shapes, does not flow, does not shrink. The color palette includes 3 wood shades and white. |
It is applied at a temperature of + 7 ° C, dries within a day, the consumption is 25 kg per 130 running meters. The sealant is packaged in containers of 3, 6 and 25 kg
Neomid Wood Professional
| An acrylic compound intended for processing log joints, window and door frames, adjoining wooden structures to concrete, brick and metal surfaces, sealing cracks in all types of wood. Has elasticity up to 300%, excellent heat retention, quick and easy application. Operating temperature range from -40 to + 80 ° С, application temperature - from -10 to +35 ° С. Service life is about 10 years. |
Packaged in containers of 0.6, 3 and 15 kg
| German manufacturer of paints and varnishes. Produces several types of sealants, depending on the purpose.
Mezhventsovy sealant Zobel Zowo-Seal - is used to seal longitudinal cracks and mezhventsovy seams using the "warm seam" technology. Due to the addition of silicone to the composition, it acquires additional properties: an increase in the tensile coefficient up to 600%, accelerated hardening, it is allowed to paint the surface after 20 minutes.
Consumption of 100 ml per 1 running meter.
Consumption of 100 ml per 1 running meter.
| It is used for sealing between the joints, window frames and door jambs, grouting cracks. Elasticity up to 500%, withstands temperatures from -20 ° C to + 75 ° C. Bonds well porous and non-porous materials, resistant to water, UV radiation. Working temperature from + 5 ° С to + 40 ° С.
Consumption of 100 ml per 1 running meter.
Ramsauer Acryl 160
| Sealant for joints between wood, brickwork , plaster, concrete, used for sealing seams in window and door frames, facades, aerated concrete elements. The protective film is already formed after 10 minutes. Elongation to break up to 600%. Working temperature from + 5 ° С to + 40 ° С.
Consumption of 100 ml per 1 running meter. Withstands up to -45 ° C.
You can purchase sealants in online stores, for example, dom-kraski. ru. Often the prices for products in them are lower than in specialized offline stores.
When choosing a store, pay attention to comfortable delivery conditions and the status of an official dealer of the manufacturer whose products you want to purchase.
Applying sealant is a simple process, but there are some subtleties here too. In order for the treated surface to look neat and attractive, and the tightness of the joints to remain as long as possible, you need to carefully read the technology and carefully prepare the base before starting work.
The new log house does not require special preparation - it is enough to wipe the seams with a damp cloth from dust. But if the building is already in operation, you need to perform a number of actions for high-quality processing of joints.
Wooden walls, as a rule, are treated on the outside with protective impregnations, many of which contain solvents and oily substances. The sealant will not stick tightly to such a surface, which means that the top layer must be removed. It is best to process the base using a grinder with an abrasive nozzle, or at least a hand float with an emery cloth.If the walls have not been treated or a water-soluble impregnation has been used, it is not necessary to sand the surface.
Abrasive blast grinding of wood
Cleaned white log wood
If mold or mildew is found on the walls, these areas are separately cleaned and an antiseptic applied, for example, NEOMID 440, Biosept, Senezh Ultra.
You cannot leave them untreated, otherwise the fungus will continue to destroy the wood. Oily oil stains are wiped with a solvent until completely removed, and then these places are washed with soapy water and rinsed with clean water.
Antiseptic for wood for outdoor use NEOMID 440 ECO
After that, the quality of the seams is checked: they must be even and dense, without visible voids and other defects. The found gaps must be filled with a mezhventsovy heater. The most convenient and practical option is a polyethylene foam sealing cord.
Foamed polyethylene harness
Foamed polyethylene harness for sealing joints - joints in log cabins
It is convenient to work with it, it does not let heat through, increases noise insulation, is not afraid of moisture. Wide cracks should also be filled with insulation to reduce sealant consumption.
In the process of work you will need:
Prepare in advance everything necessary for work
In the absence of experience, you need to start with horizontal seams between the crowns of a log house, and the joints cut over the corners of the structure last.
Log seam before sealing with sealant
Wipe the first seam from the corner to corner. It is not necessary to wet it too much, as water droplets interfere with the adhesion of the sealant to the wood. The main thing is to clean the seam of dust and debris.
Step 2. Insert the tube into the gun, cut off the nozzle at the tip at an angle of 45 degrees so that the hole diameter does not exceed 4-5 mm.
If, instead of a tube, the composition in buckets is used, the pistol must be placed vertically on the hole in the lid, and, holding the locking plate, pull the piston up.
Sealant set in a tube
Step 3. Press the tip to the joint between the logs, hold the gun itself parallel to the seam. Begin to gently squeeze out the sealant by slowly moving the tip along the seam. The layer thickness should be in the range of 4-6 mm, this is quite enough for reliable sealing.
Step 4. After filling the seam along the entire length, take a narrow spatula, dip it in water and smooth out the sealant with light pressure.
You can spray the seam with a spray gun
Do not apply too much pressure, as the layer will be too thin and may break when hardened. Excess composition is immediately gently wiped off with a clean, damp cloth. If a thin film has already set on the surface, you need to walk along the seam with a damp brush before smoothing.
The photo shows how to remove excess sealant
Smoothing the joint
Cleaning the sealant with a cloth
Removing excess sealant with a spatula
The seam is even and neat
All other seams are processed in the same way. It is worth considering that the final color will appear only after a while - from 4 to 10 days after application. For the first 3-4 days, the walls should not be wetted until the sealant is sufficiently strong.
Treated log seams
Crack in log
Tools and material for repairing cracks
To repair a crack, you first need to use a knife or a screwdriver to clean it from the debris that has accumulated inside, and blow it out of dust ..
Clean debris and dust from the crack
Use compressed air for a good quality cleaning
Cleaning with water
Then, masking tape is glued around the crack perimeter on both sides so that the sealant has an even edge. A sealant made of polyethylene foam is inserted into the crack and pushed inward with a spatula to a depth of about 7-10 mm.
Applying masking tape
Tape must be glued on both sides
Inserting the cord
Inserting the cord with a trowel
Sealant is poured into the gun and applied in an even strip into the groove of the crack along its entire length. With a spatula moistened with water, spread the sealant layer and remove excess.
After that, the scotch tape is very carefully removed and the treated area is left to dry.
The tape remains to be removed
The quality of the seal depends on many factors , including the choice of the composition. For log cabins, especially new ones, it is necessary to acquire a composition with the highest elasticity, since in such structures the deformations are stronger.
Elastic sealants are suitable for log houses
Standard sealants are suitable for glued laminated timber houses: this material is less prone to shrinkage and cracking, and therefore there is no point in overpaying.
When buying, be sure to check the expiration date: you should not choose products whose shelf life has already expired, and even more so, you should not buy expired goods.
If you buy the composition in buckets, make sure that the lids are tightly closed and the containers are not damaged.
Check the expiration date and integrity of the packaging
Most sealants can be applied at subzero temperatures, but it is unacceptable to do this during rain or snow ... In the cold, the viscosity of the composition increases, which makes it difficult to apply, therefore, the sealant must be left at room temperature for a day before work.
Do not dilute the sealant with water in order to save money, and also mix compounds of different brands with each other. This will result in reduced adhesion and may cause delamination of the material.
Sealants must not be diluted with water, the composition in the package is already ready for application
If the sealant is frozen in the container, it does not lose its properties , but you only need to defrost it at room temperature. In no case should containers be placed near a radiator or other heating devices.
Posted By: Work Style |04, Nov 2020
Posted By: Work Style |13, Nov 2020
Posted By: Work Style |02, Nov 2020
Posted By: Work Style |03, Nov 2020
Posted By: Work Style |04, Nov 2020