热水垫
我的HPWH正在高大的爬网空间中，我想保护基地。由于它在爬网的条件之前就进行了，因此我正在考虑使用冷凝器垫，但是其中大多数以不到400磅或负载为顶，并且我的水加热大约是填充时的两倍。
I found the Insulfoam water heater pad, but it is not available online from what I can tell.
What alternatives are there?
Also, since this is going in before the conditioning of the crawlspace, I was thinking of putting some thick plastic sheeting between this and the drain pan to allow the contractors something to better seal to. Is this a good idea? I am concerned that a seal to the pad will not be as good as a plastic to plastic one.
Norman
CZ 3A
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
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Replies
Norman,
I'm not sure what you mean by a "pad."
Are you saying, "I'm installing a heavy water heater on a dirt floor"?
If that's what you are saying, why not pour a small concrete slab?
绝缘剂热水器垫是EPS绝缘盘的磁盘，旨在在热水器下清洁，以限制热水器底部和地板或平板之间的热传递速率。
A condenser pad is a thin (typically 2") pre-formed reinforced concrete structural support, designed for supporting the outdoor half of a split AC or heat pump system in locations where there isn't a pre-existing paved area or slab to support that weight.
他们甚至不是遥不可及的事情。
我怀疑您想要的是一块小型结构混凝土板，具有足够的能力来处理热水器的重量。
在爬行空间地板上最高1.5英寸的EPS的气候区域中，在生命周期的能源使用方面可以在财务上是合理的。大约4'x 4'x 4'x 4“ x 4”电线增强混凝土板，其下方应为1.5英寸很好，即使其余的爬行空间只有2英寸的非增强大鼠平板。
这不仅仅是在那里摔跤一个大型冷凝器垫，但是...
将土壤井关好，并安装几英寸的洗涤砾石，使砾石紧凑。一张3/4英寸的EPS切成两半的EPS被切断在砾石上，然后是EPDM或6英里或重的聚乙烯，至少6'x 6'，与最终的地面蒸气屏障有足够的重叠。设置混凝土形式，并安装一层＃21加固网格，在蒸气屏障上支撑着1.5-2英寸，并用几块便宜的混凝土摊铺机，在倒入之前，用钢丝绑在网眼上，将适当的厚度绑在网状上。（Box Stores通常在$ 10- $ 10-将其切成3.5'x 3.5'的3.5'x 7'网眼中，并以表格为中心。
Making the forms out of pair of 8 foot 2x6 cut in half would make a nearly 4' square pad (46.5" nominally) , and would be the right depth for 1.5" of foam + 4" of concrete if resting on the gravel. Alternatively you can cheat the thickness a bit and go fully 4' square on the EPS and use 2x4s for forms resting on top of the EPS, but it might be hard to keep the forms on top of your foam unless you firmly stake them. With the 2x6 approach you'd have to trim the EPS into 46.5" squares that fit inside the forms.
这将花费大约六个80磅的典型预混合“高强度”混凝土在Box Stores出售。在独轮车或5加仑的铲子上，用铲子进行的手工混合是相当数量的，但可做。
用手将混凝土混合为一个小地下项目后，我意识到，从盒装商店租用小型搅拌机的价格非常引人注目。
肯定听起来像是爬行空间地板将是岩石，上面有蒸气屏障。不具体。
我可能只是确保岩石是水平的，在上面放了一点刚性泡沫，然后将热水器放在顶部。
An 800lb water heater, assuming a 22" diameter, only exerts 2.1PSI. There's really no need for special foam or concrete.
在泡沫下或覆盖其余的蒸气屏障似乎是合理的。
Nick- how are you inferring that the crawlspace floor will be rock w/vapor barrier? It could just as easily be uncompacted soil with vapor barrier, closed cell foam sprayed directly on soil, or any number of possibilities that would need something to stabilize the dead weight of the water heater. The foam doesn't need to be anything special, but the underlying soil has to be able to take the weight and not move too much over time too.
4'方形混凝土垫仍应具有钢网钢筋，以限制开裂问题。在倒入的混凝土垫中，裂缝中心的半吨死重负荷仍可能出现（即使在小地震场景中，几乎可以肯定）。但是，随着电线的加固，任何出现的裂缝都不会随着时间的推移而生长，或者至少不够快，无法在热水器的生命周期内重要。
爬行空间的地板是红色的粘土，上面有一些岩石。头部房间很高，距离爬行空间门50英尺以上。那带有发电机垫的砾石底座呢？我可以以200-300美元的价格获得其中之一，它们将容纳大量的体重（从字面上看）。或者，Driversitech的此垫子可以按其网站持有1000磅以上的含量（http://media.diversitech.com/doc/DOC32248.pdf），大约50美元。http://a.co/8tqtwkc
Norman, here's a shot of my water heater on a sheet of dricore and then 3 inches of basic rigid foam insulation. Even a 10psi rigid foam with that much surface area is going to be fine as long as the base is flat. That's where the effort is going to come in for you, making the base flat. Dana's idea of poring a small pad after compacting the soil is a great one and exactly what I'd do if it was even remotely possible to compact the soil a little.
编辑：我猜是马丁为我附上了文件吗？谢谢。
Clay soil is fairly plastic (varying in plasticity with moisture content)- it deforms and flows over time when under constant pressure. Fully compacted or undisturbed clay soils are often good for 1500lbs per square foot or better dead weight (under footings for walls, etc.). Uncompacted it will be a lot less. Even if the pat can take it, the pad has to be quite a bit bigger than the ~25" diameter footprint of the water heater and reasonably rigid (to distribute the weight) for this to work, since the compression ratings of the soil are unknown, and usually pretty lousy for clay soils. With just the footprint of the water heater to work with the clay would be seeing something between 200-250lbs per square foot of constant pressure.
多样性技术垫有足够大的尺寸，可以在粘土土壤上浮动800磅的负载，但是由于它们只是I型EPS核心，用于聚丙烯织物增强的水泥泥浆多焦，因此可能不足以使土壤足够刚性。也许有5/8英寸纤维水泥板（例如5/8英寸的Durock或Cutheed Glasroc Tile Backer）在热水器和垫之间，它可能与36英寸x 36英寸的Diversitech垫一起使用（额定值约为1500磅））或更大。如果没有更硬的东西可以在更大的垫子面积上分配热水器的重量，我希望垫子最终会在水加热器附近弯曲，如果土壤不足以压实。用刚性（3'x 3'=）9平方英尺或更大的情况下，将每平方英尺的死重施加到100磅以下，甚至相当柔软的粘土土壤也不会移动Heluva批次。在热水器和垫之间更刚性的纸张，如果发生土壤确实会压缩一点，则垫子的拐角不太可能扣紧。需要额外的刚性是否取决于实际土壤特性。
Could there be a way to suspend the water heater from the joists above with drop links, or cables, something along those lines?
一切皆有可能，但是倒入的混凝土垫将更简单，更可靠，而设计工作比任何形式的悬挂式储罐方法都更少。声音耦合也可能是悬浮热泵热水器的问题。
Thanks for the good feedback. Could I get a few more thoughts on my second question?
“此外，由于这是在爬网空间调理之前进行的，所以我想在此和排水盘之间放一些厚厚的塑料板，以使承包商有一些东西可以更好地密封。这是一个好主意吗？我担心垫上的密封件不会像塑料对塑料一样好。”
Norman,
Putting down a rectangle of polyethylene under the water heater is fine.
什么是高的爬网空间？50英尺？坦克有多大？您是在挖掘储罐的爬行空间上的一个洞吗？您对爬行空间有很大的开口吗？粘土和岩石听起来潮湿。您认为HP加热器在那里运行良好吗？如果可以的话，我会找到另一个位置。有一天会很有趣！