Beijing plastic steel doors and windows | Full analysis of profile standards, climate adaptation, configuration selection, and construction acceptance

First, what are Beijing plastic steel doors and windows, the application background and positioning in Beijing

Schematic diagram of PVC-U profile section of plastic steel doors and windows

Plastic steel doors and windows, scientific name PVC-U unplasticized polyvinyl chloride plastic doors and windows, are energy-saving doors and windows products assembled by multi-cavity PVC profiles, built-in galvanized reinforced steel linings, insulating glass, sealing strips, and hardware fittings. It is also a very mainstream category of doors and windows for the transformation of old residential areas in Beijing, self-built houses, and rigid demand residential balconies.

Beijing belongs to the cold B area. In winter, the low temperature is long, the temperature difference between day and night is large, and there is a lot of wind and dust in spring. At the same time, the traffic flow in the urban area is noisy. There are clear local mandatory standards for heat preservation, air tightness, wind pressure resistance, dust and sound insulation of external windows, which are obviously different from the selection ideas of doors and windows in the southern region. Many old windows in Beijing are aging and leaking air, condensation, and ash. Replacing plastic steel doors and windows is a cost-effective transformation plan.

Many owners are prone to confuse plastic steel windows with broken bridge aluminum windows: the advantages of broken bridge aluminum lie in high structural strength and rich color choices; the core advantages of plastic steel doors and windows are low thermal conductivity of original profiles, outstanding thermal insulation performance, multiple sealing levels, and affordable prices. It is suitable for Beijing families with limited budgets who prioritize heating, energy conservation, dust and sand protection.

We undertake the customized transformation of plastic steel doors and windows in various regions of Beijing, strictly following the Beijing local door and window specification DB11/T1028-2021, suitable for residential, old residential, cottage courtyard door and window replacement projects in different areas such as Haidian, Chaoyang, Fengtai, Tongzhou, Changping, Fangshan, etc.

Second, Beijing plastic steel doors and windows must comply with the national standard and Beijing local norms

Door and window test report, screenshot of local standard documents with pictures

In Beijing, to make plastic steel doors and windows, one must not only look at the general national standard, but also meet GB/T 8814, GB/T28887, and the Beijing Municipal "Technical Standard for Energy-saving Doors and Windows Engineering for Civil Buildings DB11/T1028-2021". For energy-saving renovation projects in new residences and old residential areas, supervision and acceptance will check the parameters against this local standard.

The specification is clear: 7 floors and above buildings are prohibited from using outer casement windows, and when using sliding windows and inner open and inverted windows, anti-falling and anti-outdoor disassembly safety devices must be installed to avoid the risk of high-rise falling fans. This is a very critical hard requirement in Beijing.

In terms of energy-saving indicators, the heat transfer coefficient and air tightness level of external windows in cold areas have a lower limit, and the air tightness level of external windows in Beijing is generally required to be no less than level 6; the sound insulation index of street-facing apartments should also meet the standard, and the sound insulation amount of external windows next to the main road needs to meet 30dB or more to reduce traffic noise interference.

Profile wall thickness, steel lining thickness, glass dew point, and drainage structure all have clear acceptance thresholds. Low-cost non-standard plastic steel windows often fail the energy-saving acceptance. In the later winter, large areas of condensation, wind leakage and sand leakage will occur, and failures will occur in the northern climate. Before procurement and transformation, it is recommended that merchants provide profile test reports and glass hollow test reports.

Third, the core points of plastic steel door and window profile cavity structure, wall thickness and steel lining

Multi-cavity plastic-steel profile cut open, close-up drawing of steel lining installation details

Qualified Beijing special plastic steel profiles are multi-cavity structures, which are independently divided into thermal insulation chambers, drainage chambers, and steel-lined reinforced chambers. Generally, three-cavity, four-cavity, and five-cavity profiles are the mainstream. The more cavities, the better the heat insulation, sound insulation, and drainage capabilities. Common series in the market include 60, 65, 70, 80, and 88 series. The numbers represent the width of the profile frame. 60, 65, and 70 series casement windows are commonly used in Beijing home renovation. 80, 88 are mostly used for sliding large windows and balcony windows.

The wall thickness is the first barrier to distinguish the pros and cons: the wall thickness of the main profile of the casement window is ≥2.5mm, the sliding window is ≥2.2mm, and the casement door is ≥2.8mm. The wall thickness of inferior products is only 1.8mm or even thinner, and the wind in Beijing spring is prone to fan deformation and weld cracking.

Steel lining is the "skeleton" of plastic steel windows, and many low-priced products steal steel lining or do not install steel lining. Standard steel lining is Q235 hot-dip galvanized steel, the wall thickness of the steel lining for windows is not less than 1.5mm, and the steel lining for doors and pieces is ≥2.0mm. The steel lining must be fitted with the profile cavity, and the fixed position of the hardware must fall on the steel lining, otherwise the screws will slip after the switch is stressed, the window sash will sink, and the air will not close tightly.

Colored exterior profiles are preferred for ASA co-extruded profiles, which are artificially aged for 6000 hours and are resistant to ultraviolet rays and weather; whole-body dyed profiles have poor weather resistance and are not suitable for long-term outdoor sun exposure in Beijing. They are easy to fade and become brittle, and are not recommended for exterior windows.

IV. Glass configuration and sealing system selection suitable for Beijing climate

Insulating glass structure, multi-channel sealing strip node diagram

Beijing is cold in winter and has a lot of wind and sand, so simple single-layer glass is completely unsuitable. The standard configuration of plastic steel doors and windows must be insulating glass, and the mainstream configuration is 5 + 12A + 5 double-glass hollow; the improved solution uses 5 + 12A + 5 + 12A + 5 three-glass two chambers, with Low-E coating, to further reduce the heat transfer coefficient and reduce the condensation and dripping on the inside of the glass.

The dew point of insulating glass requires 11728413 2001-40 ° C. The aluminum strip adopts warm edge strips to reduce the thermal bridge of the glass edge. This is particularly important in the environment with large temperature difference in Beijing in winter. Ordinary aluminum spacers are easy to fog the glass edge and fail.

The sealing system determines the ability of dustproof and windproof sand. Qualified plastic steel windows use multi-channel EPDM EPDM sealing strips to distinguish ordinary rubber strips. EPDM rubber strips are resistant to low temperatures, and will not harden and lose elasticity at minus ten degrees. In winter in Beijing, window opening and window closing seals continue to be stable; the rubber strip interface is oblique to hot melt docking, leaving no gaps to avoid sand and dust from drilling into the room along the gaps.

Many old owners have reported that after replacing the windows and windowsills, there is still a layer of ash, mostly due to the use of inferior recycled rubber, single-pass sealing, and disconnection of the rubber strips. In the spring windy dust season, the defects will be particularly obvious.

Fifth, the selection of plastic steel doors and windows opening method, Beijing high-rise and low-rise selection suggestions

Comparison renderings of styles of inner opening and inner inverted window, sliding window and casement door

Mainstream opening forms of plastic steel doors and windows: sliding windows, inner casement windows, inner open inner inverted windows, outer open windows, casement doors, combined with Beijing building safety codes, there are clear red lines for selection.

For high-rise buildings above 7 floors, it is strictly forbidden to open windows externally. Priority is given to opening inward inverted plastic steel windows. In the state of inverted micro-ventilation, rainwater is not easy to drift into the house, and it is not easy to bump in windy weather. Daily inward opening, clean glass safety, is a popular style for high-rise residential renovation in Beijing.

Low-rise bungalows, small courtyards on the first floor, old-fashioned multi-storey houses, with limited budget, can choose sliding plastic steel windows. Opening sliding windows does not occupy indoor space, and the price is lower. The disadvantage is that the sealing performance is weaker than opening inside, and the sound insulation and dust protection effects are slightly worse. Houses close to the road are not recommended.

For the noisy apartment facing the street, the inner opening and inner inverted + three-glass two-cavity configuration is preferred; the small courtyard and balcony doors are made of plastic steel casement doors, which are better than sliding doors in sealing and thermal insulation.

For large-scale balcony windows, thickened steel linings must be installed inside the pipe to prevent the distortion and deformation of the overall frame under strong wind load. Many cases of balcony closure and rollover are caused by the omission of steel linings in the position of the pipe.

Standardized construction process and installation key points of Beijing plastic steel doors and windows

Frame installation, foaming, sealant construction real pictures

The plastic steel window is installed in three parts and seven parts of the profile, and the air leaks and leaks in the northern region. 80% of the problems lie in the installation process. Standard construction process in Beijing area: on-site accurate measurement, factory blanking, welding, production, door-to-door cleaning, removal of old windows, positioning and leveling of old window attachments, vertical and horizontal correction, fixing piece, fixed filling, polyurethane foam, outer weathering sealant, closing, inner beauty glue glass, fan body, hardware debugging, finished product protection, acceptance.

Key details: The gap between the window frame and the wall is fully filled with high-density polyurethane foam, and the foam cannot be exposed after cutting. Weathering silicone sealant is applied on the outside, and the rubber layer is continuous without breakpoints. This is the first line of defense to block the penetration of rainwater. The Beijing wall is divided into external wall insulation wall, red brick wall, and aerated block wall. The fixing method of the fixing piece is different. The aerated block wall requires a special anchoring kit to prevent the fixing from loosening.

The installation ambient temperature cannot be lower than 5 ° C. During low-temperature construction in winter, the curing speed of foaming and sealant slows down. Forcibly rushing to work can easily cause sealing failure. Many decoration companies rush to simplify the process in winter, and water leaks in the spring of the second year. At the same time, control the entry and exit positions of window frames during installation to avoid the thermal bridge effect and reduce dew condensation at the window edge.

VII. Comparison of the advantages and disadvantages of plastic steel doors and windows and broken bridge aluminum doors and windows in the Beijing scene

Schematic diagram of cross-section comparison of plastic steel windows and broken bridge aluminum windows

Many Beijing owners are torn between plastic steel and broken bridge aluminum, and objective comparisons are made based on local climate, budget and demand.

Advantages of plastic steel doors and windows: PVC profiles have low thermal conductivity, the same glass configuration, and better thermal insulation performance; multi-cavity and multi-channel sealing, good windproof and dustproof effect; price economy, batch renovation of old houses is cost-effective; profiles have their own cavities, good sound insulation foundation, materials do not spontaneously ignite, and flame retardant performance is up to standard. Shortboard: Profile rigidity is weaker than aluminum alloy, and large-scale windows are easy to deform; less colors are available, and the aesthetics of high-end facades are not as good as broken bridge aluminum.

Advantages of broken bridge aluminum doors and windows: high profile strength, large fixed glass, large balcony grid stability, surface spraying, rich fluorocarbon colors, and higher service life limit; Disadvantages: The original metal conducts heat quickly, and to achieve the same thermal insulation effect, high insulation strips and multi-cavity structure are required, and the overall cost is significantly higher.

Selection reference: old community, bungalow, limited budget, key needs are winter heat preservation, sand and dust prevention, priority is given to plastic steel doors and windows; large-span balconies, pursuit of facade texture, sufficient budget, priority is given to broken bridge aluminum.

Eight, Beijing plastic steel doors and windows common failures, post-maintenance methods

The actual picture of the aging of the rubber strip, the cracking of the weld, and the fogging failure of the insulating glass

Beijing has a large temperature difference and strong wind and sand in the four seasons, and there will be several typical problems in the long-term use of plastic steel windows: aging and hard shrinkage of rubber strips, sash sinking switch cards, stress cracking of welds, internal fogging of insulating glass, and cracking and seepage of outer sealants.

Daily maintenance: clean the profile drainage holes every spring and autumn. The drainage holes are blocked with dust and water, which will pour into the cavity and seep water along the wall. Rubber strips are wiped regularly to replace the rubber strips directly after aging, hardening, and cracking. Window sash hinges and actuators are lubricated with special silicon-based lubrication every year. Do not use oil. After the oil is stained with dust, hardware wear will be accelerated.

The plastic steel profile itself is resistant to acid and alkali, rain and dust are not easy to corrode, and the service life of normal qualified products can reach more than 20 years; but accessories are worn parts, and hardware, rubber strips, and sealants are parts that need to be regularly inspected and replaced. It is found that the interior of the insulating glass is fogged, which means that the seal has failed and cannot be repaired. Only the insulating glass can be replaced.

Nine, Beijing purchase plastic steel doors and windows to avoid pits guide to prevent merchants from reducing distribution routines

Comparison chart of qualified samples and cut corners samples

There are many low-price routines in the Beijing door and window market, and the key points for owners to avoid pits are sorted out.

First, the contract specifies the profile series, wall thickness, whether ASA co-extrusion, steel lining thickness, whether the length of the built-in steel lining, many businesses verbally said thickened steel lining, steel lining or thin steel lining is actually omitted; second, clear glass configuration, double glass or three glass, whether Low-E, warm edge spacer, hollow quality assurance years; third, distinguish between EPDM rubber strip or recycled rubber strip; fourth, confirm whether the opening method complies with the ban on opening windows in Beijing to avoid safety violations after installation.

In addition, it distinguishes between factory welding and on-site assembly. All regular plastic steel windows are welded at constant temperature in the factory, and the corners are polished. On-site screw-assembled plastic steel windows have large gaps and poor sealing, which are not suitable for Beijing's wind and sand climate. Before placing an order, you can request door-to-door survey, issue a grid plan, and a list of performance parameters to avoid later additions and price increases.

Summary: Applicable scenarios for Beijing families to choose plastic steel doors and windows

Picture: The renovation of the old house is completed, and the warm real scene by the indoor window

From the perspective of Beijing's cold climate, dust, noise, and local safety regulations, plastic steel doors and windows are not low-end doors and windows, but cost-effective energy-saving solutions that adapt to rigid demand for old house renovation, bungalow courtyards, and rental housing energy-saving upgrades. They have unique advantages in heat preservation and dust protection.

As long as the wall thickness of profiles, built-in galvanized steel lining, glass configuration, factory welding process, and standardized frame installation are strictly controlled, plastic steel doors and windows can be used stably for a long time, effectively reducing winter heating energy consumption, blocking spring dust and outdoor noise, and improving the old house window leakage and condensation problems.

Our company is deeply involved in the custom replacement of Beijing plastic steel doors and windows, covering Chaoyang, Haidian, Tongzhou, Changping, Fangshan and other regions, providing door-to-door survey, scheme design, production, demolition, installation, and after-sales one-stop service. All products implement Beijing local energy-saving door and window standards, and can cooperate with the acceptance of old community renovation projects