Fiber-reinforced cement boards
It is planned to make the coating on the facade with fiber-reinforced cement panels. What technical conditions must be met in order to obtain a durable and defect-free coating?
Fiber-reinforced cement boards must be protected against underside moisture. Horizontal coverings of fiber-reinforced cement boards should have a slope of at least 2%. The façade should be shaped in a way that ensures water drainage, e.g. in the form of oblique undercuts. Laid fiber-reinforced cement boards should have tight joints, impermeable to water. No water can penetrate through the holes drilled in the slab in the area of the joints.
Asbestos-cement plates, due to the harmfulness to health and the environment, can be installed only in accordance with the opinion and recommendations of an expert and under professional supervision.
Why is it not possible to neutralize fiber cement boards with fluorate??
Fiber-reinforced cement boards include 80-?-90% cement, therefore they are strongly alkaline. During fluorination, Only a very thin top layer is neutralized. When washing or simply by the action of moisture, the surface will be re-alkalized.
What tests of fiber cement board substrate are necessary? Please list any defects and damages to the surface
Substrate examination and fault identification:
| Type of examination | Test method | The hallmark |
| Moisture | visual | darker color |
| Presence of efflorescence | visual | White, partially loose crystalline pieces, easily soluble in water |
| The presence of anti-adhesive agents | an attempt to moisten with water | the water in the form of droplets remains on the surface, it does not soak into the slab at all or very little |
| Satisfaction | an attempt to moisten with water | The absorbent fiber-reinforced cement board absorbs water and is darker in color |
| The formation of fig | visual, possibly. an attempt to moisten with water | scratches become darker; stronger water absorption along iys |
| Coatings possible | by trying to scratch
by trial with solvent, e.g. remover, that one. a tanning attempt |
identification features:
a) cover/not cover; b) mineral cover: high hardness of the coating c) synthetic cover: insufficient hardness of the coating mineral coatings cannot be used wash or sunbathe |
| Dirt | visual | kurz, plaster spray, etc.. |
| mosses, lichens and fungi | visual | visible growth or affected surfaces |