Composite rock wool sandwich panel into the water corrosion problem causes and solutions

2023-09-28

Overview of the phenomenon：

Rock wool composite board consists of rock wool core and double-sided pre-painted steel plate, is a kind of lightweight building material, high strength, thermal insulation, sound insulation, corrosion resistance, fire prevention, in industrial and civil construction has a wide range of applications. If there is a water corrosion problem, not only the customer is disturbed, the need to spend money again to replace. And the builder is also disturbed, because it will produce financial disputes.

Rock wool in the water corrosion performance characteristics: pre-painted steel back that the front corrosion is severe, corrosion spread from the inside out. The closer to the edge of the composite board part of the corrosion phenomenon is more serious, such as eaves and other low height, the water is not easy to discharge parts.

Rockwool wall corrosion is easy to occur at the bottom, as shown below:

A common condition that leads to corrosion of composite panels into the water:

1. unreasonable modeling design, slow roof slope, and slow downward guttering.

2. Unstandardized construction

3. Roof not maintained for a long time

The main components of stone wool contain silica, alumina, calcium oxide, magnesium oxide, etc. The main raw material of rock wool is basalt, which is transformed into fiber by high-temperature, high-speed centrifugation, and resin or other adhesive combination. Its acidity coefficient is higher than 1.6, and rock wool itself absorbs water, so the water absorbed by rock wool is very corrosive to steel.

Measures to prevent corrosion of rock wool color steel tile:

1. Check whether the shingles are installed correctly

First, check if the rockwool colored shingles on the roof are installed correctly. If the shingles are not installed properly, they can easily leak. So check the mounting holes and screws for looseness or wear.

2. Repairing cracks and holes

If the shingles are properly installed but are still leaking, the cracks and holes in the roof need to be repaired. Use professional waterproofing and roof patching materials to treat and completely cover them to ensure that the catchment area is completely sealed.

3. Clean the roof and roof drainage system.

If rockwool-colored steel shingles are not maintained for a long period of time, debris and trash can be deposited on them, making it difficult for water to drain away. At this point, the roof needs to be thoroughly cleaned to remove trash and debris. If the roof drainage system fails, it also needs to be repaired or replaced.

4.Reinforce maintenance

To prevent the water problem on rockwool color steel tile roofs from recurring, it is necessary to strengthen the maintenance of the roof. Regularly check the condition of the roof, repair the gaps in time and clean the roof to prolong the service life of the rock wool steel tiles.

5. Acquire high quality roofing materials
During the construction stage, choose materials with good quality and reliable performance, such as high-quality rock wool color steel tiles. The material of color steel tile can choose pre-painted galvalume or galvanized steel with better performance and corrosion resistance. this can avoid unnecessary problems in the later use.
6. Organize a reasonable drainage system
In the design phase of the rock wool color steel roof tile roof, it is necessary to reasonably plan the drainage system, so as to avoid the occurrence of water phenomena. The roof gutter is designed to be lower, which can make the rainwater excluded smoothly.

 

About us:
Shandong Decho Building Materials Technology Co., Ltd is a professional steel company of coated steel coils and sheets, Decho Building Materials is always in pursuit of and committed to providing high quality products and services.

We specialize in high-end quality steel products with authentic warranty services.

Main Advantageous products: high zinc coating galvanized Z180~Z275g/sqm, 55% Alu-Zinc Galvalume steel AZ100~AZ150g/sqm with a thickness from 0.40 up to 1.50mm.

Our paint brands include Beckers, Valspar (Sherwin-Williams), and AkzoNobel.

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