What are the regulations regarding expansion bolts when installing plastic-steel windows?

Is the poster referring to self-tapping screws? It seems there’s a rule regarding this; I don’t have this information at hand right now. It’s probably about what size hole should be drilled for what size screw. Please help me find out.

What the original poster is referring to is probably expansion bolts. The plastic-steel windows that are commonly used in office buildings and offices these days can indeed be installed using expansion bolts. There are four points to keep in mind during installation (reposted): 1. Regarding the overlap amount of the plastic-steel windows. Plastic-steel window frames and sashes are sealed by overlapping, and the overlapping portion between the sash and the frame is referred to as the overlap amount. Industry standards do not specify the overlap amount. For casement windows, the overlap amount is generally between 8 and 10 mm. If conditions permit, it is advisable to choose a larger overlap amount; this way, even if there is a slight misalignment in the overlapping position of the frame panels during installation and use, sealing between them can still be ensured. II. Regarding the processing of the drainage holes in the middle slide track of sliding windows. Regarding the commonly used sliding windows with screen slides – that is, three-slide sliding windows – industry standards do not specify whether drainage holes should be provided in the middle slide. In the northern regions, however, due to the large temperature difference between indoors and outdoors, and because plastic-steel windows have good sealing properties, mist often forms on the surface of the glass (referring to single-layer glass windows), resulting in water accumulating between the middle slide and the screen. To allow for timely drainage of this water, it is necessary to provide drainage holes in the middle slide. Thirdly, regarding the straightness of the window frames and sashes. Due to the poor stiffness of plastic profiles. Plastic-steel window frames and sashes are prone to bending and deformation, which not only affects their appearance but also impacts the sealing performance of the windows. Once the four corners of the window frame and sashes are welded, it is very difficult to make corrections. Therefore. Correction work must be carried out before welding. IV. Regarding the installation of plastic-steel windows. As the saying goes: 30% is production and 70% is installation. Since some construction companies are not very familiar with the installation characteristics and technical requirements of plastic-steel windows, the plastic-steel window manufacturers responsible for their installation should actively coordinate with these construction companies to ensure proper manufacturing and installation of such windows. For example, how should the installation gaps for plastic-steel windows be determined? What is the proper position for the embedded components used to fix the windows? What to do if the position of these embedded components does not match the **standards** for installing the window fixing elements (in fact, this inconsistency is quite common)? In construction, whether the specifications and quantities of doors and windows match those in the building plans. When using a foaming agent to fill the gaps in openings, whether to apply mortar first or install the windows first are matters that need to be discussed with the general contractor in charge of the construction. Provide the construction company with the installation specifications for plastic-steel windows if necessary. The reference line for installing and positioning doors and windows should preferably use the same plumb line employed in building construction. Due to the poor rigidity of plastic-steel windows, plastering can easily cause the window frames to bulge inward; it is also necessary to assign someone to check the situation and take corrective actions promptly once the cement has set. VI. Regarding the filling of expansion joints. Under normal circumstances, the gaps around steel and wooden doors, windows, and openings are filled with cement mortar. In the case of plastic-steel doors and windows, since the thermal expansion coefficient of PVC plastic-steel frames is much higher than that of steel, aluminum, and cement, filling these gaps with cement can cause the plastic-steel windows to deform as they are unable to expand or contract due to temperature changes. Therefore, the gap should be filled with elastic material. In fact, the filling of the gaps is rather chaotic; some use rock wool while others use cement mortar. The **standards** for the installation and inspection of plastic-steel doors and windows stipulate that the expansion joint cavity between the window frame and the opening should be filled with elastic materials such as closed-cell foam plastic or expanded polystyrene.

This is a good topic, and it’s initiated by a moderator, so let’s have a lively discussion. It’s also quite important in reality – things like the place where you work or the decoration of your home may involve the use of plastic-steel windows. I think we can delve deeper into this subject from the following aspects: 1. The material quality of plastic-steel windows, as well as the quality, performance, and strength of their various components; 2. The standard requirements for installing plastic-steel windows; 3. The maintenance and care of plastic-steel windows; 4. A comparison of the advantages and disadvantages of plastic-steel windows compared to other types of doors and windows; 5. An analysis of the current market situation for plastic-steel windows and prospects for the future; 6. Sharing personal experiences related to plastic-steel windows