房子漏雨，急

[soulak]

昨晚发现房子二楼天花板漏雨，上attic看了一下，半面roof 都在很湿，在往下滴水。早上看了一下，那半面roofing又没雪，roofing看起来还行。现在不知什么出了问题？是不是roofing有裂缝出现？
再问，冬天有人先修理一下吗？

 

[waterloo]

今天天暖，冰化了

 

[精彩过客]

看来木头房子还是不行~

 

[Ayin_Ottawa]

应该是你二楼的保温不好，有所谓的heat loss。前年我也是注意到了自己的attic（北面）有水滴下来，我觉得是attic pit(就是探头上去看的地方）没有seal好。当时好worries，因为是三年新的roofing都漏水觉得很不爽。最近我没有看自己的attic，一是懒二而是个“眼不见心为净”的鸵鸟心态。

觉得你应该把自己的attic再加点insulation materials。我都有想给自己房子加一点。

不知道你的房子有多新。不过是不是需要forced ventilation(加电扇吹点冷气到attic).

 

[iiWii]

应该是你二楼的保温不好，有所谓的heat loss。前年我也是注意到了自己的attic（北面）有水滴下来，我觉得是attic pit(就是探头上去看的地方）没有seal好。当时好worries，因为是三年新的roofing都漏水觉得很不爽。最近我没有看自己的attic，一是懒二而是个“眼不见心为净”的鸵鸟心态。

觉得你应该把自己的attic再加点insulation materials。我都有想给自己房子加一点。

不知道你的房子有多新。不过是不是需要forced ventilation(加电扇吹点冷气到attic).

Exactly. You are leaking too much heat into the attic. Warm air meets cool air = condensation, the moisture will freez on the inside surface of the north side of the roof as it's much cooler without facing the sun directly.

In many cases, the bath room vent exhaust duct may be be installed incorrectly causing the warm moist air trapped in the attic, you should check that as the very first step.

Also, your attic should need more ventilation. I think you will see a lot of people using this kind of roof vent now and you can get it at home depot. It's about $100 each.

This is important to improve the attic ventilation, it will help you to save your cooling cost during summer and keep your attic dry (better insulation) during winter and avoid mold build up.

Recommendations on roof ventilators
Product information for the Slope Roof Model #303 ventilator

Summer:

Summer heat, trapped in the attic, creates a furnace effect, heating ceiling insulation, which then conducts heat through to the ceiling, and this heat is then radiated downward to persons and objects in the rooms below. This is why it is much warmer upstairs in the bedrooms than downstairs in the basement!
Other problems that arise by this are the curling, or the bleeding of shingles, and the warping of the sheathing. The air conditioner is working continuously to cool down the living area.

Winter:

Winter conditions bring a different type of problem. During the cold months of the year, the air inside the home is warmer and carries more water vapour than the colder, dryer air in the attic.
Cooking, laundry, showers, humidifiers and other activities using water contribute to this condition. There is a strong natural force, termed “vapour pressure”, that causes water vapour to migrate from high-humidity air or materials to low-humidity air. This migration of water vapour passes through ceilings, insulation and wood and even successfully circumvents a vapour barrier. It moves into the attic space where it can readily condense into liquid water on the cooler structural members-rafters, trusses, and especially the cold roof sheathing.
Condensation moisture within an attic or ceiling space can dampen and compress insulation. Even small amounts of condensation can have a substantial effect in reducing the "R" value of the insulation, thus creating faster heat loss into the attic space. This will eventually lead to mould, mildew, rot, ice damming, etc…

 

[闲丸]

谢谢楼上的文章，我家刚刚发生了一样的问题。房子还在保修期，叫builder来top up了一下那个有水气凝结导致漏水房间的insolation。也不知道效果能如何。。。