山泉建筑材料特性及功能：

   A、 山泉防水材料具有良好的防水性能，有效阻隔风雨对室内的侵袭
   B、提高居住舒适性
      防水透汽膜被称为能呼吸的膜(membrane)，具有极佳的透汽性能，使水汽能够迅速排
      出，降低室内潮湿度，有效避免霉菌和冷凝的形成，从而极大的改善了居
      住环境的舒适性，并提高建筑物的耐久性。
   C、 山泉保温材料节能保温  
      通过有效阻档冷热空气的侵入，起到节能保温功能。与其它保温材料配套
      使用，可以有效阻挡水汽渗入保温层，对保温层形成全面保护，同时由于
      室内外温差造成的结露现象，也可以通过防水透气膜良好的透汽功能，使
      水汽迅速排出，从而确保保温层的功效，达到持续节能的作用，
   D、 山泉墙体材料抗撕裂，耐磨，低温柔性好。
   E、具有极好的抗紫外线、耐老化特点，夏季室外曝晒三个月，仍
      保持良好的产品性能，产品经久耐用。
   F、产品材料为改性聚烯烃膜和增强无纺布，符合国际环保要求。
   G、产品柔软、轻薄，易于施工，不易留下施工死角。

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Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed and that the loft space is protected from sources of water vapour, in accordance with the requirements of the Certificate.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the opportunity for moisture ingress into the loft space and consequent risk of condensation occurring is increased. This is also true of conventionally ventilated constructions where the effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’ moisture laden warm air from the living space into the loft space. However it is recognized that the rate of moisture removal via the ventilated and unventilated approach is not the same. It is therefore important that the ceiling is sealed to an appropriate level. BBA computer modeling of the behavior of roofs has assumed effective ceiling ‘defect’ areas of up to 10 square mm per square metre of ceiling. See also Q/A 6, 7 and 11.There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable roof tile underlay membrane in certain wind conditions. The BBA has, however, only received a very limited number of reports in this regard and therefore do not view it as a fundamental problem.

Links: sewing thread, button, membrane, breathable membrane, roofing membrane, roofing foil, 防水透气膜
缝纫线,绣花线, ladder, latch hook, sewing basket,防水材料,屋顶膜,墙体膜, rug hook,律师, link1, link2

The suitability of the membranes as conventional roof tile underlays had already been established by means of conventional assessment and test programmes. The absence of conventional ventilation at eaves added the ‘new’ dimension which the BBA addressed by developing, in partnership with membrane manufacturers and suppliers, a sophisticated software package. This program used classical physics to model the dynamic movement of vapour in various roof constructions with a range of properties/parameters such as ; - internal and external humidities and temperatures - vapour permeability of the roof tile underlay - vapour resistances and defect areas for all layers in the ceiling and roof fabric - wind velocity over the roof The modelling indicates that the magnitude of the following parameters are of particular importance:
- permeability of the roof tile underlay
- rate of vapour passing through the ceiling

Links: sewing thread, button, membrane, breathable membrane, roofing membrane, roofing foil, 防水透气膜
缝纫线,绣花线, ladder, latch hook, sewing basket,防水材料,屋顶膜,墙体膜, rug hook,律师, link1, link2

What are the disadvantages of using the membrane system ?
Extra time and care is needed to ensure that penetrations into the ceiling are properly sealed and that the loft space is protected from sources of water vapour, in accordance with the requirements of the Certificate.
If the ceiling is constructed without due attention to sealing joints and around penetrations, the opportunity for moisture ingress into the loft space and consequent risk of condensation occurring is increased. This is also true of conventionally ventilated constructions where the effect of wind movement over the roof can reduce the air pressure in the loft space and ‘suck’ moisture laden warm air from the living space into the loft space. However it is recognized that the rate of moisture removal via the ventilated and unventilated approach is not the same. It is therefore important that the ceiling is sealed to an appropriate level. BBA computer modeling of the behavior of roofs has assumed effective ceiling ‘defect’ areas of up to 10 square mm per square metre of ceiling. See also Q/A 6, 7 and 11.There are reports concerning ‘flapping-noise’ in roofs incorporating some types of permeable roof tile underlay membranes in certain wind conditions. The BBA has, however, only received a very limited number of reports in this regard and therefore do not view it as a fundamental problem.

How did the BBA assess the products in unventilated roof membrane applications ?

Links: sewing thread, button, membrane, breathable membrane, roofing membrane, roofing foil, 防水透气膜
缝纫线,绣花线, ladder, latch hook, sewing basket,防水材料,屋顶膜,墙体膜, rug hook,律师, link1, link2

The suitability of the membranes as conventional roof tile underlays had already been established by means of conventional assessment and test programmes. The absence of conventional ventilation at eaves added the ‘new’ dimension which the BBA addressed by developing, in partnership with membrane manufacturers and suppliers, a sophisticated software package. This program used classical physics to model the dynamic movement of vapour in various roof constructions with a range of properties/parameters such as ; - internal and external humidities and temperatures - vapour permeability of the roof tile underlay - vapour resistances and defect areas for all layers in the ceiling and roof fabric - wind velocity over the roof The modelling indicates that the magnitude of the following parameters are of particular importance:
- permeability of the roof tile underlay
- rate of vapour passing through the ceiling