在哪里放雪地护卫？
Part of my retrofit included a standing-seam metal roof, the type
带有扣子的面板。我读过一些人的先验
experiences with metal roofs and snow, and spent some of my first
冬天看着大檐口在边缘慢慢形成
然后在房子的后面，敲打，到达地下室
小匹配的屋顶的舱壁和外边缘
热泵[和男孩，我很高兴我构造了 * *]，
and shoveled most of what fell farther away from the house so it
wouldn’t form a huge mound and then melt toward the basement wall
之后。这有点烦人，可能不是很好
地下室舱壁。现在我认为那会多
easier to let all that melt and run off through the drainage
系统。
正面有12/12的音高，没有关键的基础设施
它，所以我现在不必担心那一边。背部
脸部向南，在棚屋的棚屋上有4.6/12的音高
forms most of the roof’s width and that’s where I want to put snow
guards. From what I read it’s in the “critical region” of pitch
where snow guards make the most sense. The roof panels there
长度约为16英尺。前后都有一个
排水沟，所以雪滑下，慢慢卷曲了
在叶子领域和周围的外边缘进行协商
排水沟也是在这次设法承担负载的同时，
很明显，有时会低于一定程度的压力。
So to mitigate all this I’m looking at theS-5“配色”系统
and have already done the load math for the assumed “two-plus feet
湿的废话”最糟糕的案例，他们必须退缩。后部
悬垂是两英尺，在4英寸Polyiso的“啤酒冷却器”上建造
上roof and walls so there’s a pretty generous soffit “cave” under
the lower two feet of roof run. With the insulation, there shouldn’t
be any heat-leakage problem from underneath — I noticed no evidence
任何类似冰坝的东西，只是整个“冰川”慢慢地
sliding down and big chunks of it dropping off during sunny days.
因此，问题是，有了这种特殊的屋顶结构
任何人都对雪地护卫队的最佳位置有意见
relative to the exterior wall? Does it matter much in this case?
I was figuring on a foot or two up from the bottom edge of the
像大多数人一样屋顶，只剩下一点雪
below them to fall off, but wanted to draw on any prior experience
涉及更好绝缘结构的地方。
即使在明年冬天提前思考时，我也发现
上e other downside with metal roofing: wasps love them, and have
已经在试图进入棚子下的空间
窗户从主屋顶线分裂。有一些小
unavoidable holes where the soffit and roofing couldn’t
完全网格，我在文章中预测
将是昆虫的有吸引力的地方。现在我塞满了
some fiberglass into the visible holes in a way that won’t be
在任何水的道路上，但是如果有人有更好的想法……
_H*
GBA Detail Library
由气候和房屋部分组织的一千个建筑细节的集合
答复
From a quick read, it sounds like you are planning on having the snow on one side of your roof, and no snow on the other. If that is correct, that is very dangerous. Roofs are generally not designed to have a load on one side only, and could (and do) collapse. As for the placement of the avalanche clips, I am not an engineer but I see no reason to not let the roof stay fully loaded until it melts off, if it was designed for that load. In other words, put the clips near the edge of the roof; that worked for me. That said, you may want to see an engineer to see if you need another row up higher. A bunch of snow on a steep roof generates a fair load along the roof. Falling snow is extremely dangerous. If you have not been caught in a roof load that has slid off, I would advise remaining inexperienced thereof. The snow packs around you quite tightly, just like in an avalanche. Been there, done that. I hope my humble opinions help.
如果您期待大量的降雪，则需要放置多套。通常，雪在金属屋顶上积聚，然后一旦达到一定的重量就可以了。如果您只有守卫在底部，那么积雪可能会有很多动力。我看过设置，就像您建议您被撕毁一样。
您不需要更高地点的雪地防护装置 - 像这样的一些夹子 -http://www.snojax.com/store/index.php?l=product_detail&p=11- 会没事的。
而且，我们只有一侧就没有效果，但由EN Engineer运行它肯定不会受到伤害。
Just be careful with unbalanced loads. When we had extreme snow one year, a few roofs collapsed because people were shoveling off one side at a time. A quick search revealed this sites of interest. Unbalanced loads can be problematic, and I would sure never design a system that was going to have them for sure. Cheers.
http://www.structuremag.org/article.aspx?articleId=796
http://voices.yahoo.com/balanced-unbalancenc-snow-loads-gable-froof-3501177.html?cat=15
http://www.eng.auburn.edu/users/staylor/snow_loads_basics.pdf
好吧，我经历了各种参考，唯一的事情
I can determine hazardous about "unbalanced loads" is the fact that
较重的部分立即超过结构的容量
下。
One of this past winter's major storms came with high winds from a
fairly uniform direction, and most of the houses ended up with a big
屋顶南侧的一堆漂流的雪几乎
nothing on the north side. This would have happened whether anybody
had snow-guards or not, and on all the asphalt-shingle roofs, so we
really have no control over that. Besides, my roof is asymmetric
首先，前面的12/12和4.x/12的大部分背面
因此，这些部分的雪负荷总是会有所不同
独立于屋顶材料或熔体/滑动速率。所以我不是
得到有关降雪的一些问题，造成任何其他问题
那还不存在。你们都想告诉我
if my roof has a uniform snow load front and back and the portion
在正面突然滑落，现在的背面有些不同
和更危险的负载条件，降雪量相同
那已经在那里了吗？我不是在买那个。
This roof survived the "ice dam hell" we all experienced in New
英格兰两个冬天前，这是很多雪的结合
在短时间内，中间降雨量
us a thick layer of heavy wet crap. Quite a few commercial buildings
didn't make it. I was up in my attic gingerly examining the rafters
和棚屋下的中跨支撑，但即使什么都没有
看上去很不对劲或压力太大，我上了顶，铲除了
无论如何，大部分地区。当然，所有这些都是预脱发的方式
and now if anything the structure up there is quite a bit stronger
比以前。
所以我不是too worried about structural capacity here, I just want
most of the snow in the back to not thud down onto my infrastructure
以下。最初的问题是要留下多少净保留的问题，
e.g. how far up the guards should go. I figure if the last foot's
worth of snow falls off directly, that's far less an issue than if
all sixteen feet worth wants to cascade down and bury my heat pump
when the sun comes out. And as I said, I've done the load math,
预期最差的面板平行负载250磅
后棚用户侧的附件。我不这样做的原因
bothering with the front is that the run length is longer, the pitch
为12/12，每面板纵向负荷将是一个很大的
更多，足以担心螺钉在
最高的固定点可以固定它。这样的东西就可以滑下来
看到合适的前院进入未占领的前院。
在大多数情况下，斯诺并没有真正“雪崩”两边
在我的第一个冬天用这个屋顶。一个或两个sections may have
come down a little faster than others, but for the most part the
天沟的轻微嘴唇适中的滑动速率。我意识到那是
总是会严重依赖我们得到的雪的类型，
白天与夜间温度，随后的几天融化条件，
等等，但是将这些东西握在后面，让它融化
进入排水坑似乎比去更好的主意了
外出并铲压缩的积累远离后壁。
_H*