How deep to chisel with a hammer for interpanel joints
How to properly apply sealant for interpanel joints
The quality of sealing interpanel joints depends on several factors at each stage of the process. Consider in more detail the nuances of proper sealing of interpanel joints.
Inspection of old seams
The first thing to do is to do a joint inspection. The aim of this step is to find out whether it is a primary or a secondary sealing. And also whether there is a need to open up the joint.
Initial sealing is done when the house is just built and the joints are empty. Secondary sealing is the repair or renewal of previously sealed joints. Can be done with or without opening, depending on the condition of the seam.
For sealing regular joints you will need a sealant and a sealant tape Vilaterm. Sealing deep joints will also need polyurethane foam to fill in the missing depth of the joint, as it should not be hollow. An alternative way to fill the voids is to lay several layers of Vilaterm.
It is necessary to measure the depth and width of the seam. In the case of secondary sealing, the joints must be opened at several points and measured. In the secondary sealing without opening the seam, added a tolerance of 15-20 mm on each side, so that the sealing occurred with the overlap of the old sealant and adhesion to the base of the wall.
Calculate the consumption of sealant according to the formula: Mp=btV (kg/p.m), where b is the width of the joint (m), t is the thickness of the sealant layer (m), V is the unit weight of the sealant.
The choice of sealant depends on the type of sealing. For primary sealing, as well as secondary sealing of all kinds, two-component polyurethane sealants are excellent. For secondary sealing without opening (80% of joint repairs) and on horizontal joints with and without opening, acrylic sealants are suitable.
We also buy tools (spatulas, mixers, etc.) for the.д.).
The adhesion of the joints depends on surface preparation. adhesion strength of material to the substrate. That is why special care must be taken when preparing the joint. Remove all loose particles of concrete and old sealant with a brush and other tools. Ideally, there should be nothing left over. Clean all ice, dirt, dust and other contaminants from the joints very carefully.
Additional priming of the sealed surfaces will improve adhesion.
To reduce the consumption of sealant and the correct formation of the seam, you can fill the seam with polyurethane foam. In this case, take into account that between the foam layer and sealant will be laid Vilaterm. It is possible to seal the joint only with Vilaterm in several rows without using foam.
It is unacceptable to apply sealant on foam, as it has adhesion to it. It creates a third point of support, due to which the geometry of the sealant significantly decreases in all planes. This has a negative effect on service life. eventually the sealant just comes off the surface or tears it (cohesion and adhesion failures).
Vilaterm not only forms meniscus (the length of the half circle is always greater than a straight line, which is a factor that reduces the load), but also creates an anti-adhesion gasket between the sealant and the foam, as the sealant does not adhere to polyethylene. Use painter’s tape to make the joint borders aesthetically pleasing.
Step 5 apply sealant
Before applying the sealant, pay attention to the weather conditions. If it is going to rain, high air humidity (relevant for acrylic sealants) or air temperature above 30ºС. Sealing work should preferably be postponed. Work should be carried out in cool, sunny and windy weather. If it is still necessary to seal in hot weather, moisten the surfaces to be sealed to prevent the sealant from rolling away during application. Dripping water should not be allowed to drip onto the sealing surfaces. If it rains during application, the work must be stopped and the applied and not yet cured sealant must be covered (protected).
Acrylic sealants are one component sealants and it is not necessary to mix them, as well as dilute with water and other solvents, the same refers to one-component polyurethane sealants. This reduces all performance properties by 50%.
The two-component polyurethane sealants should be thoroughly mixed with a mixer using slow-speed drill (400-600 rpm)./min) for 10-15 minutes. How well the sealant is cured depends on the thoroughness of mixing. Once the two components are mixed, the curing process of the sealant is irreversible. Also note that mixed two component polyurethane sealants have a maximum life time of 5 hours. During this time it is necessary to work out the mixed sealant.
The sealant is applied with a putty knife and smeared into the joint. The tighter pressed the sealant to the surface, the stronger the bond. Brush application is not permissible. After applying sealant if you used scotch tape to align the edge of the seam, it is desirable to remove it within 10-15 minutes.
Step 6 Painting the sealant
To the painting of the seams proceed after 7 days after sealing. Alternatively, tint the sealant in advance using color catalogs. Acrylic sealants are successfully tinted and painted with water-based exterior paints. Polyurethane sealants do not tint.
In the non-vulcanized state, acrylic sealants are water washable, polyurethane sealants. organic solvent. In the vulcanized state, both types can only be removed mechanically. Wear personal protective equipment when working with sealants!
Remember. If you follow these rules you will get durable seams that will last a long time!
Industrial alpinism. Work at height.
In any panel house or industrial building sooner or later need to repair the joints.
This happens because under the influence of temperature panels move, expand, shrink. Cement joint cracks, then moisture gets there and begins to destroy.
The wind blows into the joint or moisture penetrates into the apartment and mold appears in the corners.
The technology of repair of panel joints
The “warm seam” repair technique is now generally accepted.
Cleaning of the seam from mortar, old insulation, adhesive.
Seam insulation with assembly foam. all internal cavities and recesses are filled.
Laying of a thermal insulation flexible bundle Vilaterm, which withstands multiple compression/extension cycles.
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How we do it
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We perform 100% opening of inter-panel joints (no gaps).
Opening depth = joint width min. 5 cm
Completely remove all mortar, Velcro, old insulation.
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How to use a Chisel CORRECTLY
Foam the joint with assembly foam 5 cm (or more) deep.
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Immediately we lay the insulation tape Vilaterm with compression 25-30% flush with the board or slightly deepening the tape.
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Apply two-component sealant Sazilast-24 to the joints. Application thickness of 3-5 mm.
It is possible to make a mistake (screw up) at every stage of the technology.
Mistakes are made unknowingly or intentionally to speed up the repair process when the price is low.
Why waste time on dissecting? You can do a little bit of splitting, foaming and caulking.
1-2 centimeters of foam does not solve the problem, the seam will freeze further.
The seam is open, but not thoroughly cleaned. there is still a solution left in it, the sticky part, which is difficult to take out.
The minimum opening depth should be equal to the sum of the seam width (for wilaterm) plus 4-5 cm for foam.
Foam error. saving foam.
In this case, the foam does not fill the chips and cavities inside the panel.
Wrong choice of the diameter of the vilaterum (because of the lack of the required diameter at the moment).
Vilaterm must be laid with cross-compression of 25-30%.
If the diameter of the wilaterum chosen is less than the desired, the foam will squeeze it out of the seam, if more. It sticks out of the seam itself, t.к. does not go into it.
The thickness of the sealant should be in accordance with the instructions 3-5 mm, t.к. any sealant shrinks as it dries.
The error is a thin layer of sealant. Cracks may appear when drying.
Wrong type of sealant. Cheap sealants deteriorate in the 2nd year due to ultraviolet light.