Home improvement expert group: Sun room leaks from the sealant to find the problem
Publisher: Oriental Rubber Industry Time：3/1/2022 5:41:37 PM hot:
Shijiazhuang Real Estate News: I built a sun room on the terrace with the help of the outer wall, but the junction between the roof and the wall of the sun room is prone to water leakage in summer. Now the wall paint at the leaking place has been moldy, and it seems to be still there. Condensation has occurred. On the other side of the roof of the sun room that is connected to the wall, the interior wall paint cracks. I guess it may be that the waterproofing project has not been done well, so I want to do a thorough renovation before the rainy season. I don't know what kind of exterior wall waterproofing material to choose? What kind of process is required for a complete refurbishment? What should I do if the wall paint is moldy and cracked?
——Reader Mr. Liu
Moldy walls caused by water stains
After listening to Mr. Liu's description of the problem in the sun room, Sun Li, deputy chief engineer of Beijing Oriental Yuhong Waterproof Technology Co., Ltd., judged that the possibility of condensation in the sun room is not high, but it is very likely to be unlucky. She introduced that the roof of the sun room has a slope, which is high in the middle and low on both sides. If there is rainwater, it is generally along the drainage slope, and the water is discharged to the root of the junction of the roof and the wall. Because there are leaks, water leaks down the wall, causing the wall to flow frequently. Water may enter the insulation layer. If the insulation material is foamed polystyrene board, this material has high water absorption, which will cause the insulation layer to be wet. After a summer, the moisture in the insulation layer is exposed, and the phenomenon of mildew will appear. Once the insulation layer is full of water, it will also cause the paint on the wall to change color.
As for the cracking of the wall paint on the other side, it is initially judged that there is also a water leakage phenomenon, "the mortar layer may have water retention", resulting in the cracking of the paint.
The sun room does not do profile waterproofing
As for the question of what kind of waterproof material Mr. Liu should choose, Sun Li said that the structure of the sun room is generally built with the help of the developer's exposed terrace. The sun room is generally made of resin or glass, and it is impossible to waterproof between the lighting surface and the concrete. Because the waterproof material cannot be bonded to the glass and resin materials, and the waterproof membrane material also affects the decorative effect of the exterior wall. "From the perspective of aesthetics and practicality, the sun room will not be waterproofed by profiles."
The culprit of water leakage or sealant
Since there is no need for profile waterproofing, how does water leakage occur? Sun Li said that the glass and resin themselves are watertight. If there is water leakage, the leakage point is at the seam. "Sealings are generally used at seams, and leaks should be caused by a problem with the sealant."
Sun Li introduced that if the adhesive strength of the sealant was not strong at the beginning, it would be easy to have poor adhesion. Even if there was no problem during construction, after three or four years, with the wind and rain, the sealant would appear slightly. Vibration, and finally a gap appears, causing water leakage. In addition, the sealant used in the sun room is located outdoors, often in contact with the air, and the failure rate is fast. If the weather resistance is not strong, it will soon crack and cause water leakage.
Three steps to completely solve the problem of water leakage
Regarding Mr. Liu's troubles, Sun Li said that the sealant needs to be checked first, not only the junction between the roof and the wall, but also the sealant between the glass and the glass should be checked for cracks and weak bonding Case. Remove all the glue in question and reapply the sealant. "It is best to choose weather-resistant silicone sealant, which has strong weather resistance and long service life." Sun Li said.
Experts advise Mr. Liu not to rush to repair the wall immediately. "Let it dry, open the wall, remove the damp insulation board according to the thickness of the original wall to keep warm, repackage the insulation board, and then repaint the paint after it is restored to its original state." For the paint part, Mr. Liu can consider removing all the paint, re-scraping the putty, and painting the paint.
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Exterior wall leaks you may encounter
The roof is leaking
Symptoms: It may be that the occupants on the top floor find water leaks, or after several floors, mold or leakage occurs on a certain wall, or occupants on several consecutive floors find water leaks in the same place.
Solution: The roof has both a waterproof layer, a slope layer, and a thermal insulation layer. Once a water leakage accident occurs, the water may flow in the entire building, and it will only be revealed when the building is weak. In addition, if the deformation joints in the building structure are not tightly blocked, it will also cause water leakage for multiple users. If this kind of water leakage occurs, it involves a wide range of issues and is very complicated to deal with. Sun Li suggests that the owner seek unified treatment from the developer and the property. "If there is a leak in the window or in the bathroom, local repairs can be done, but if the owner encounters such a situation, even if he makes a small repair on the leaking part, it is only a short-term treatment behavior, and it is basically ineffective to treat the symptoms but not the root cause.
water leaking from the window
Performance: The seams and seams of the tiles on the balcony wall appear to be opposite to the arch, and even the brick surface has water droplets and other serious water leakage.
Solution: If the sealant at the window fails, it will cause rainwater to enter the window countertop through the crack, and then enter the wall, and then the insulation material absorbs the water. After the change of seasons, the water will be pressed into the room in summer, and then the phenomenon of water leakage will occur. This may be a gradual process, and after the mortar inside the tile is full of water, it will leak to the surface. The solution is to find the leak in the window and reseal it with a good quality sealant.
Air conditioner hole leaking
Performance: coating cracks, mildew, and even water leakage appear at the holes of the air conditioner.
Solution: Under normal circumstances, the air conditioning hole should be sloped, so that it is easy to drain. However, some air-conditioning holes are not inclined enough. When it rains, when the wind blows, the rainwater will enter the air-conditioning holes. Over time, water will accumulate in the wall, and it will gradually appear. It is recommended that the owner pay attention to whether the exhaust port has a slope when installing the air conditioner. After the installation, the holes should be blocked from the outside, and the inside should be rigidly waterproofed to completely eliminate the hidden danger of water leakage.
water leak through hole in wall
Symptoms: The paint is cracked, moldy, or even leaking somewhere in the house.
Solution: During the building process, some through-the-wall screws. After the construction is completed, the post-blocking will be carried out. If the plugging is improper, there are gaps left, and the materials used in the two repairs have different expansion coefficients, which will easily lead to larger and larger gaps, which will also lead to water leakage. This situation cannot be dealt with on the outer wall, and only the rigid waterproof coating can be applied near the hole in the inner wall, and then the paint is applied by scraping the putty.
Lightning protection system cracks and leaks
Symptoms: There may be water leaks in the same part of several floors of households.
Solution: Some buildings have lightning protection systems on the walls and roofs. Poor construction will lead to cracks in the surrounding area, and the water will flow down, and it will manifest itself when the construction is weak, causing water leakage in several floors of residents. If users find that it is not a single leak, they can find developers and properties to fundamentally solve the hidden danger.
