Mythbusters - smooth or corrugated, which is more reliable?
Any building, regardless of its purpose, must meet three criteria: utility, durability and beauty. Of course, the profile for drywall - it's not a beam, holding the multi-ton roof of the building, but he is the supporting structure to which is attached, is not weightless, suspended ceiling. And it is the quality of the profile depends on how reliable will be the structure over your head. Low-quality profile for wall designs, at first glance, and is less harmful. But, it is very desirable to the newly renovated the wall suddenly cracks, tearing lovingly chosen expensive Wallpaper.
Buying profile for gypsum Board, you invariably are faced with a difficult choice. In the face of tough competition, many manufacturers of gypsum Board and profiles trying to attract the attention of consumers and for this purpose come in a variety of tricks, creating a myth around a particular product or its quality. What are these myths?
Some manufacturers announce loudly that the frame walls of the corrugated profile is 25% stronger than the same partition on the basis of the smooth profile of metal of the same thickness. The second are convinced that the strength of the butt joints of the drywall sheets significantly influences the shape of the edges of the sheet. Third, advertising your products, claim that thanks to the unique patching surface profile, self-tapping screw equally easy savelives without slippage at any point of the profile with the possibility of deviation angle to 45°.
We decided to look into what actually determines the strength, durability and quality profile for gypsum Board and produced from it designs.
The myth (misconception) No. 1 - the thickness of the metal.
From the thickness profile depends on the future strength and reliability of the whole structure, its load properties and even the appearance of cracks on the walls. In addition, even the most insignificant reduction of the thickness reduces the reliability of fastening of sheets to the frame of the profiles.
Actively promoted Riffley profile due to the irregularities of its surface actually makes it impossible to check the thickness of the metal of which it is made. And the producers of such a profile rather vaguely suggests that "the increase in the "effective thickness" can save up to 20% of the cost for each overhead meter using a metal of a lesser thickness".
The sleek profile is still a bit thicker than corrugated. In addition, due to the slab surface, the metal stretches slightly, so that a smooth profile wins the "bumps and holes", if we talk about the ability to withstand loads.
In the manufacture of corrugated profile, we can say that stretch the metal, and this is bad because in these places it becomes thinner.
The myth (misconception) No. 2 – a Slight tightening of a screw to any point of the profile.
This myth reads: "Thanks to the grooved surface profile, the screw is equally easy savelives without slippage at any point of the profile". However, the manufacturers specify that "savelives it with the possibility of deflection angle up to 45°".
Artists working with plasterboard, you know that not even the screwing in at an angle, usually leads to further problems. In mounting technology described in the rulebook SP 163,1325800.2014 "Design with the use of gipsokartonnyh sheets and sheets of gypsum. Rules for design and installation", screw the screws can be just the right angle and nothing else, regardless of profile type, not less than 10 mm from the edge of the edge.
When the tip of the screw hits on the grooved part of the profile, the sliding and fastening screws not exactly, which means that the bad drywall is held in the frame, tearing the cardboard, cap screw protrudes from the plane of the sheet, which prevents further filling.
Working with a smooth profile, it is enough just to crush the screw with a screwdriver, and it is strictly perpendicular is screwed into the metal.
Mif (error) No. 3 Corrugated profile stronger and more reliable.
As a rule, the bending profile of the structure occurs in the systems of suspended ceilings and partitions when they are hung massive objects. To determine how responsive and smooth corrugated profile for the load when hanging massive items in systems of suspended ceilings and partitions, was carried out special laboratory tests.
It was found that with increasing load the groove profile is more susceptible to deformation than smooth. Also the comparison was carried out on the subject of the efforts at snatching: in a smooth profile, it was 925 Newtons, and the corrugated profile - only 690 Newtons. That is, a smooth profile is more loose. Thus, the corrugation in no way improves the durability and reliability of plasterboard structures.
The myth (misconception) No. 4 - safer Hard mount.
The theme of rigid mounting frame is raised almost exclusively among experienced builders, using in his work technology of dry construction. It is considered that the retention of sections in the frame, thanks to the grooved surface allows us to achieve greater reliability and robustness, besides the fact that saves time when installing.
But there is a factor that works in minus the hard mount – if the profiles in the frame are rigidly connected with each other, no technological gaps for the perception of shrinkage of the building, a corrugated profile, in contrast to the smooth, can't move in the frame, which will lead to the rapid appearance of cracks in the drywall and other defects. The main reason is the load on the partitions that appear when shrinkage/shifting home, especially buildings. Smooth profiles can move in the frame, and grooved profiles - no.
The truth about corrosion. In the process the same laboratory tests of smooth and grooved profiles, which we mentioned above, a comparative analysis for corrosion resistance. Metallic profiles were placed in the chamber SOLEVwow fog that simulated storage in open conditions and operation in the environment. So, the tests showed that the smooth profile was the most protected from external influences through high-quality steel with a zinc coating. So, applying the profile of the corrugated surface deteriorates the corrosion resistance. Giving the profile of the corrugated surface leads to damage to the zinc coating.
In addition, when you install the rack into the guide profile can also scratch the zinc coating, which will lead to the same corrosion.
Summing up, I want to say that the truth about the clinic is that the profile need to take a proven! And it's important to choose not the disparate materials and the complete system from one manufacturer. It is only in this case will make a qualitative design, where each metallic element was tested in equal conditions, meets unified standards of quality, has the same characteristics of thickness and galvanizing metal, and destined for each other.