Why are light steel villas widely used in my country?

Since ancient times, warm in winter and cool in summer is the best compliment to a house. In the history of Chinese architectural development, the cave dwellings in northern Shaanxi, the yurts in Mongolia, and the bamboo buildings in Yunnan are representative buildings that are warm in winter and cool in summer, but they all have strong regional applicability. At present, the light steel villa, which is being vigorously promoted by the state, can not only be warm in winter and cool in summer, but also has the widest application range.

The principle of warm in winter and cool in summer

The ideal thermal insulation design should make the thermal insulation material continuously and evenly cover the outer envelope of the entire house, but in the actual design and construction, it is difficult to achieve this ideal state due to various reasons such as installation and fixation, lighting and ventilation.

The so-called "cold bridge" refers to the weak parts or gaps in the insulation material covering the whole house, such as the ribs on the board embedded in the building envelope, the parts that are compressed when the insulation cotton is fixed, the roof and the wall openings , Insulation material and floor junction, etc.

Three kinds of cold bridge phenomenon

1. Purlin cold bridge with single-layer steel plate roof

In the roof system of steel structure buildings, whether it is a single-layer steel plate roof or an inverted gusset roof, the thermal insulation cotton is usually compressed and directly fixed between the steel plate and the purlin, and the thermal performance is greatly reduced, resulting in a decrease in the thermal insulation capacity of the entire building.

2. Secondary purlin cold bridge with double-layer steel plate roof

In many cases, for the convenience of laying insulation cotton and the cleanness and beauty of the roof, the roof panel adopts the construction method of double-layer steel plate. In order to maintain a stable space between the steel plates, steel secondary purlins are usually added in the middle. When laying insulation cotton, the insulation cotton will be compressed a lot at the secondary purlin. When the insulation cotton is laid along the direction of the purlin, there will be no insulation cotton on the secondary purlin, and the phenomenon of cold bridge is very obvious.

3. Roof self-tapping screw cold bridge

Generally speaking, in standing seam or concealed gusset roofing systems, the roof panels are snapped or concealed through brackets fixed to the purlins. For the self-tapping screw of the fixing bracket, one end is directly exposed indoors, and the other end is under the roof steel plate, which is almost exposed to the outdoors, so the screw is equivalent to a heat transfer channel, and the heat directly passes through it from the indoor. If it is transmitted to the outside, in the cold season, if the indoor temperature and humidity are high, it is easy to produce condensed water at the end of the screw, and even ice-hanging phenomenon will be formed in serious cases.

Light steel villa cold bridge system

The anti-cold bridge insulation screw consists of two parts: the bottom is a special self-tapping screw, and the upper part is a polymer screw head.

The entire insulation screw system has been carefully designed and tested by authoritative testing institutions, and the pullout resistance can reach 5.1KN. The construction method of the screw: install a special steel sheet on the special thermal insulation purlin, the steel sheet is pre-drilled with a round hole, and the thermal insulation screw is embedded in the thermal insulation purlin through the hole and fixed, thereby effectively fixing the special steel sheet. The bracket of the roofing steel plate is directly connected to the steel sheet instead of the steel purlin, thus effectively avoiding the occurrence of screw cold bridge.

For steel structure single-layer steel plate roof. If the indoor humidity is greater than 50% in the normal production state of the plant, insulation pads and insulation screws can be used to solve the cold bridge problem. The application method is to pre-fix the insulation pad on the steel purlin with double-sided tape before laying the insulation cotton, then install the steel sheet and the insulation screw, and then fix the roof steel plate fixing bracket directly on the steel sheet through the insulation cotton.

For steel structure double-layer steel plate roof. If the indoor humidity is greater than 50% in the normal production state of the plant, trapezoidal thermal insulation purlins and thermal insulation screws can be used to solve the cold bridge problem. The application method is to install trapezoidal thermal insulation purlins first, then install steel sheets and thermal insulation screws, and then fix the fixing bracket of the roof steel plate directly to the steel sheet through thermal insulation cotton after the lining of steel sheets is completed.

The thermal insulation performance of light steel villas is highly professional and requires skilled professionals to assemble and install. Therefore, when building light steel villas, you need to ask a professional construction team to operate them. Be sure not to assemble them without authorization, so as not to lose more than the gains.