How To Use Fiberglass Fabric / Fiberglass Mesh for Waterproofing Construction?

This article will introduce the steps of using fiberglass fabric or fiberglass mesh for waterproofing construction, and also cover the benefits and precautions of using fiberglass fabric for waterproofing.

Why use fiberglass fabric for waterproof construction?

The purpose of adding fiberglass cloth or fiberglass mesh is to strengthen the structural belt of the waterproof coating and enhance its tensile strength and water resistance. Because glass fiber has the characteristics of high strength, high modulus, high temperature resistance, and not easy to age, it is used in the field of waterproofing.

Specifically, fiberglass fabric can prevent cracking and deformation of the base layer, while improving the overall toughness and hardness, preventing the waterproof coating from cracking or falling off during long-term use. In addition, fiberglass cloth helps prevent the base layer from peeling off the coating, thereby increasing the overall service life and waterproofing performance of the waterproof coating.

Steps of using fiberglass fabric/fiberglass mesh for waterproofing construction

1.Preparatory steps

Clean the oil, dust and loose materials on the surface that needs to be waterproofed with fiberglass cloth. If there has been a waterproof layer before, you need to shovel off the previous waterproof layer. Some outdated waterproof layers are very likely. Loss of waterproofing effect due to aging. If the ash layer is difficult to remove, try flushing it with a high-pressure water gun.

If there are cracks or depressions in the wall, the cracks need to be repaired and filled first. If the exterior wall is uneven, smooth it first and then polish it before doing waterproofing. The thickness of each layer of plaster cannot be greater than 2cm. If it is too thick, a steel mesh needs to be designed at the layered position. Make sure the wall is smooth, solid and not loose.

The wall needs to be kept dry before construction. If the wall is damp, you must wait until it is completely dry before proceeding to the next step.

2.Painting of waterproof layer

When the wall is repaired and completely clean, the first layer of waterproof paint can be applied. The thickness should be even and the paint should not be missed. And the first coat of waterproof paint should not be too thick. If the waterproof paint is thicker after mixing, you need to add a little waterproof slurry to dilute it. Otherwise, it will be too thick and the base surface will not be absorbed properly and the bond will not be strong. After the first layer of waterproof coating is completely dry and forms a film (it will not stick to your hands when you touch it and it will not dent when you press it. If you are in a humid place, you can extend the time appropriately), then apply the second layer of waterproof coating.

It should be noted that before painting a large area, it is necessary to use a leak-proofing agent to strengthen the waterproofing treatment of floor drains, yin and yang corners, pipe roots and other prone to water leakage areas.

In order to prevent missed coating, the "cross-brushing method" can be used.

3.Laying of fiberglass mesh or fiberglass fabric

Cut the mesh from the entire roll of fiberglass mesh according to the required length and width, leaving the necessary overlap length or overlap length.

Cut it in a clean and flat place. The cut mesh must be rolled up and not folded.

Lay the fiberglass cloth or fiberglass mesh flat on the construction surface. If the fiberglass mesh is slightly curved, place the curved surface toward the wall to avoid warping. Use a scraper to compact the fiberglass cloth to ensure a tight fit with the coating.

4.Outer coating and reinforcement

After the fiberglass cloth is laid, apply the waterproof coating twice. It is recommended to control the glue coating thickness between 1-2mm to ensure the density and viscosity of the glue. When squeegeeing, you need to pay attention to the angle and strength of the squeegee to ensure that the glue and fiberglass cloth are fully adhered and compacted.

After the scraping is completed, the waterproof fiberglass cloth needs to be reinforced to ensure the stability and durability of the construction effect.

There are two main methods of reinforcement:

One is to roll the waterproof fiberglass cloth before the glue is dry to fully fit the waterproof fiberglass cloth to the base layer.

The other is to perform a second scraping after the glue is dry. Glue treatment to enhance the bonding force between the waterproof fiberglass cloth and the base layer.

Precautions when using fiberglass fabric/fiberglass mesh for waterproofing construction

1. Pay attention to the environment and temperature during construction to ensure that the temperature of the construction materials and construction surface is appropriate to avoid affecting the construction effect.

2. Pay attention to safety during the construction process, wear personal protective equipment, and avoid harm to the human body caused by contact with construction materials.

3. Construction materials should be selected that meet relevant standards and quality requirements to ensure the quality and reliability of waterproofing construction.

4. In order to achieve good waterproofing effect, you need to pay attention when waterproofing exterior walls: exterior wall tiles should not be seamlessly tiled, the seam width should be greater than 5mm, and cement mortar or polymer cement mortar should be used as the filling material.

The intersection of concrete beams, columns and masonry should be treated with polymer cement waterproof mortar to enhance waterproofing. The reinforced layer of waterproof mortar should be sandwiched with alkali-resistant glass fiber mesh. The fiberglass mesh should be fixed to the concrete and masonry with iron nails. body surface. The thickness of the waterproof reinforcement layer mortar should not be less than 5mm, and the width of the cover joint should not be less than 150mm on each side.

External insulation exterior walls should also add a layer of "anti-crack mortar + fiberglass mesh" outside the insulation layer to prevent rainwater from entering the insulation layer.

5. After the construction is completed, inspection and acceptance should be carried out in a timely manner to ensure that the quality of the construction meets the requirements.

The above are the basic steps and precautions for fiberglass waterproofing construction techniques. During the actual construction process, adjustments and optimizations need to be made according to specific conditions to obtain the best waterproofing effect.