COMMUNITY FORUM

JanetD

07:02AM | 08/08/06
Member Since: 08/07/06
1 lifetime posts
Bvroofing
Hi there, I'm building a 1400 sq ft two-story home in Southeast Alaska (cool, rainy climate) and need some advice. The house is framed with 2x6 (24 in. OC) walls sheathed with 1/2-in. CDX. I'll have R-21 fiberglass batts in the wall cavities. I also plan on having rain-screen walls, i.e., horizontal wood siding (5/8" local hemlock) nailed on to 1/2" furring strips to create an air space behind the siding. In addition, I plan on adding 1-in. rigid foam insulation (unfaced extruded polystyrene, i.e., pink board) to the entire exterior for added insulation and a thermal break. This seems simple enough -- there is even an article in the current issue of Fine Homebuilding (Aug/Sept 2006) on how to install rigid foam insulation -- however, there are a couple of important details left out in the article that I can't figure out. Mainly, how to integrate the foam panels with a rain-screen wall and also with window/door flashing. The article also doesn't explain how to integrate/install housewrap/felt when using unfaced rigid foam panels. I'm using 15# felt instead of Tyvek. Where does the felt go in the layering? Do I install the felt directly over the CDX as would be traditional, and then nail the foam over the felt? (then nail on the furring strips and finally the siding) If so, then the back of my airspace in the rain-screen is going to foam, not felt, which seems wrong. But if I put the felt over the foam panels, that doesn’t seem right either.

The FH article also skips over how to flash the windows and doors when using rigid foam panels. I have Certain-Teed vinyl windows. The article suggests furring out each rough opening (to match the thickness of the foam) to create a solid surface for nailing on the siding. They suggest you build a simple frame around each window/door opening and butt the foam panels against the frame to create a flush surface. However, they don’t explain how to flash this configuration. I plan on using one of the flexible flashing products like Fortiflash/E-Z Seal around the windows and doors. These strips would traditionally be installed directly against the rough opening (i.e., against the CDX) but if I furr out the openings as suggested, then do I wrap the flashing around the openings and then OVER the furring strips, treating the whole unit as one? How do I integrate this drainage plane with my felt drainage plane?

I guess my question comes down to -- if I want to integrate rigid foam panels with a rain-screen wall, how do I keep my drainage plane intact?

Any advice on how I should assemble all of these layers would be much appreciated: CDX sheathing, 15# felt, 1-in. foam panels, ½-in. furring strips for rainscreen, window/door flashing, windows, siding? Thanks in advance from a novice builder who is trying to do it right…

Billhart

07:21AM | 08/08/06
Member Since: 04/25/05
1915 lifetime posts
You might want to look at the Building Science website.

http://www.buildingscience.com/designsthatwork/default.htm

I am not sure if they so any designs that incorporate both features. So you will need to go through the different ones to see.

Also go through the different papers and articels that they have.

http://www.buildingscience.com/resources/default.htm

FHB also had an article on rain screens a couple of years ago.

Another option is to put the foam on the inside wall.

Also you might want to discuss this in the FHB Breaktime forum.

http://forums.taunton.com/tp-breaktime

They have a lot more volumne of messages and more pro builders.
Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

Anonymous

Post_new_button or Login_button
Register

Who says festive lights are just for Christmas? This Halloween-scape illuminates the possibilities with well-placed lights... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled entryway will get you in the outdoor mood. Grab your coat... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... A kitchen in a greenhouse—who wouldn't enjoy spending time in this light-filled space? Details that enhance the conservato... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... The Infinite Artisan Fire Bowl from Eldorado Outdoor is made from glass-fiber reinforced concrete, and offered in Oak Barr... The vibrant green of Granny Smith apples make a beautifully natural alternative to the traditional evergreen wreath. Brigh...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp2