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气候区3C:爬网空间,屋顶和墙壁系统评论

菲尔·布特尔(Phil Boutelle)|发布绿色建筑技术

I’m in the design phase of a remodel of an existing 2 story house, CZ3 coastal, zip code 95062. The scope includes a new foundation and gutting the house with some interior walls moving, but for the most part keeping the existing exterior shape and roof line. Goal is a high performing house (well insulated, air sealed, mechanically ventilated, high IAQ and minimal heating and cooling loads). I’ve attached a line drawing of the shell for reference.

该基金会将在码头和邮政上进行外围,并提出一个未通向HRV的供应和返回寄存器的无通向爬网空间。地面上的蒸气屏障(可能是倒在顶部的大鼠板),在茎壁上2英寸的Polyiso,在边缘托梁上的闭孔喷雾泡沫。

Do I need to air seal in between the crawl space and the house interior? Does the HRV supply/return meet the requirements of the ‘conditioned’ crawl space? For the spray foam, should I make sure it doesn’t cover up the mud sill, and do I leave a gap between the polyiso and the spray foam, exposing a bit of concrete and the mud sill? In my CZ, do I need to bother with insulation under the vapor barrier and rat slab?

提议的墙壁系统从内而外,如下:干墙 - > 2×4墙,带有密集的包装纤维素 - >胶合板护套 - >剥离和粘贴蒸气和蒸汽可渗透的空气和水屏障(蓝调VP100) - > 1-1//> 1-1//4英寸Roxul - > 1×4垂直毛茸茸的条。在一楼,我们计划安装灰泥,并直接连接到毛茸茸的条上。入口区将具有垂直壁板。在二楼,我们计划安装纤维水泥产品,即带状疱疹或板壁板。在地板之间将是腹部带装饰。

Does this wall system seem reasonable? Can I install a continuous rainscreen, with furring strips all the way up the building, and vary the exterior cladding?

提议的未通风屋顶系统从内而外,如下:干墙 - > 2×6带开放式牢房喷雾泡沫的墙 - >胶合板护套 - >剥离和粘贴蒸气 - 可渗透的空气和水屏障(Blueskin PE200HT?) - > 3''polyiso(2层,交错和胶带的接缝) - >第二层胶合板护套 - > 30#毡纸 - >站立的接缝金属屋顶。拱腹将开放。

Does this roof system seem reasonable (to get to R-38)? Am I placing the peel and stick membrane at the right level, or should it go on top of the foam, and wrap around the fascia? Could I then tape the plywood seams to act as an air barrier, or should I use something in between the rigid foam and the lower layer of sheathing?

Any feedback is appreciated, and apologies for so many questions at once (I’ve been saving them up).
-Phil

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答复

  1. GBA Editor
    马丁·霍拉迪(Martin Holladay)||#1

    菲尔,
    Q. "Do I need to air seal in between the crawl space and the house interior?"

    答:不一定,尽管担心爬行空气的质量可能会说服您这样做。

    Q. "Does the HRV supply/return meet the requirements of the 'conditioned' crawl space?"

    A. Not the way I read the code. (An HRV introduces cool air in winter and warm air in summer, so it can't condition a space.) For more information, seeBuilding an Unvented Crawl Space

    问:“对于喷雾泡沫,我是否应该确保它不遮盖泥泞的窗台,并且我是否在多丽莎和喷雾泡沫之间留出缝隙,暴露了一些混凝土和泥泞的纹身?”

    A. From a thermal perspective, covering everything up with insulation (either polyiso or spray foam) is best, but termite worries in some sections of the country preclude the best insulation details. In termite-infested areas, you may be required to leave a bare inspection strip. If you are unsure on this issue, consult your local code enforcement officer.

    问:“在我的气候区,我需要在蒸气屏障和大鼠板下打扰隔热材料吗?”

    A. No.

  2. GBA Editor
    马丁·霍拉迪(Martin Holladay)||#2

    菲尔,
    问:“从内而外,提议的未通风屋顶系统如下:干墙 - > 2x6墙[您的意思是afters afters吗?空气和水屏障(Blueskin PE200HT?) - > 3“ Polyiso(2层,交错和胶带的接缝)--->胶合板护套的第二层 - > 30#毡纸 - >站立的接缝金属屋顶。拱腹将开放。这个屋顶系统似乎合理(到达R-38)吗?”

    答:尽管您可能可以通过替代其他绝缘材料(纤维素,矿物质羊毛或玻璃纤维)来省钱,但可以奏效。

    问:“我是否将剥皮膜放在正确的水平上?”

    答:是的。不过,我不确定为什么您希望剥皮膜蒸发蒸发。不必是。

    Q. "Could I then tape the plywood seams to act as an air barrier?"

    答:您可以,尽管最重要的空气屏障位于果皮层(直接在屋顶护套的最低水平上方)上。

  3. GBA Editor
    马丁·霍拉迪(Martin Holladay)||#3

    菲尔,
    问:“从内而外,提议的墙系统如下:干墙 - > 2x4壁,含有密集的纤维素 - >胶合板护套 - >果皮和粘贴蒸气 - 可渗透的空气和水屏障(Blueskin VP100) -- > 1-1/4“ roxul-> 1x4垂直毛茸茸的条。在一楼,我们计划安装灰泥,并直接连接到毛茸茸的条上。入口区将具有垂直壁板。在二楼,我们计划安装纤维水泥产品,即带状疱疹或板壁板。在地板之间将是腹部带装饰。这个墙壁系统似乎合理吗?”

    答:尽管有更便宜的方法来获取R-18墙,但它将起作用。

    问:“我可以安装连续的雨屏,并一直沿着建筑物的毛茸茸,并改变外部覆层?”

    A. I don't see why not.

  4. 菲尔·布特尔(Phil Boutelle)||#4

    马丁,

    感谢您的这些回复以及有用的链接。我确实生活在白蚁重的地区,所以我会留下检查差距。对于爬网空间通风,我理解HRV无法调节空间的代码解释,但是没有替代方法可以连续机械通气,只要流速足够,HRV就会遇到这一点吗?

    There are cheaper ways to get to the roof/wall R-values than what I am proposing. I was given budget pricing that dense pack insulation was about the same cost as open cell spray foam. I prefer something sprayed on/blown in, versus a batt installation.

    我绘制了计划集的附件细节。

    再次感谢。

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  5. GBA Editor
    马丁·霍拉迪(Martin Holladay)||#5

    菲尔,
    问:“没有一种替代方法可以连续机械通气,只要流速足够,HRV是否会遇到这一点?”

    A. Not that I know of. It's worth pointing out, however, the building codes are often amended by individual states and even municipalities. So if you want an interpretation of your local code, the only person who can help you is a local code official.

  6. 菲尔·布特尔(Phil Boutelle)||#6

    I'm revisiting this roof assembly to avoid foam, both sprayed and rigid, if possible. A roxul tech recommended using Roxul Rockboard 60 rigid insulation board in place of polyiso on exterior roof insulation. In the rafter cavity below, I have this drawn as R-22 batts, but in this roof I'd prefer to use a blown-in insulation, maybe fiberglass, to fill all the voids. Will this work as a compact unvented roof?

    第二个问题是,如果我可以发泄部分屋顶怎么办?这所房子有一个室友,北面的屋顶飞机主要在阁楼空间(卧室掉落的天花板)上,楼上的登陆/走廊上有一些大教堂天花板。如果我用2x2毛皮,我可以在走廊天花板上创建一个通风孔空间,并使用R22 Batts。在阁楼上,我会使用吹散的松散填充纤维素/玻璃纤维,但在after子中没有烤面包,只是打开通风。屋顶甲板上仍然有刚性绝缘(Roxul ??)。我会隔离阁楼空间和走廊之间的墙壁短部分。这种发泄策略会起作用吗?

    附有两个施工细节。任何反馈都赞赏。谢谢!

    文件格式 文件格式
  7. GBA Editor
    马丁·霍拉迪(Martin Holladay)||#7

    菲尔,
    如果要创建通风屋顶组件,则所有绝缘材料都必须位于通风口通道的内侧。如果您邀请两层绝缘材料之间的室外空气,如下面的细节所示,您将在通风口通道的外侧进行绝缘材料一文不值(因为在冬季,您邀请了冷空气进入三明治的中间)。

  8. 菲尔·布特尔(Phil Boutelle)||#8

    感谢马丁,这很有意义。由于大教堂的天花板部分没有足够的空间将其折叠到2x2以上,因此我将使整个屋顶发明,并将隔热层保持在甲板上和after子上。在卧室上方的三个阁楼空间中(由上方的倾斜屋顶创建,卧室的平坦天花板),我是否应该包括供应并返回HRV,也许每个空间之间都有注册表?

    如果我使用第一个细节,在屋顶上方有刚性的roxul,并且在发明的after液腔中(安装在屋顶甲板的底部安装了齐平的腔)中的空气渗透性纤维隔热材料,在此组件中,空气屏障的最佳位置不是什么?我需要任何地方的蒸气屏障吗?看来我的屋顶可以朝任何方向变干。我已经阅读了有关Intello智能蒸气屏障的信息,但不明白/为什么在CZ中的这个组件中需要它。

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