The ceiling must be made of profiles. Sunroom manufacturers indicate that some door and window processing factories merely lay tempered glass on the steel structure when making simple sunrooms, and bond the glass with curtain wall structural adhesives. It can be said with certainty that such a ceiling is bound to leak after one season. Because the expansion coefficients of glass and structural adhesive are different, after the construction and the alternation of cold and hot weather, there will inevitably be cracks between the glass and the structural adhesive. Even a tiny hole the size of a pinhole will cause leakage, and it is impossible to determine the specific repair point afterwards.
Therefore, the ceiling must be made of profiles. The profiles are overlapped with the glass to reduce the effect of thermal expansion and contraction. For many years, steel-plastic co-extruded profiles have been consistently used as the basic profiles for the ceiling.
The exterior of the steel-plastic co-extruded profile is thickened high-quality PVC, the inner cavity is a closed special-shaped high-anti-corrosion steel plate, and the corners are joined by screws, which increases the physical strength of the ceiling. The bonding effect between the glass and the profile is good. In fact, the bonding effect between silicone sealant and PVC plastic is good, but it has a poor bonding effect with metals such as aluminum. A better bonding effect can ensure a certain level of waterproof performance.
