COMMUNITY FORUM

BV002985

10:27PM | 01/09/14
Bvmisc
This is going to be difficult to describe. We have an upstairs bathroom, the wall with the vanity and sinks faces what would be an outside wall but it is underneath the garage roof. The BR also sits partially above the garage.

We had a frozen pipe (has happened a few times) and one finally busted. Once the plumber cut the hole to fix the leak I could finally see what was in there. There is no real insulation in the cavity. There is the exterior wall then a gap then the interior wall which is insulated.

I want to insulate the area better where the pipes run through but I am not sure the best way to do it. My thoughts so far are:

(After patching the hole of course)

1) Spray foam the cavity - Cons cost and I don't know if this would be a problem since the interior wall is insulated. Would also have to put some kind of block between the floor batting insulation and the foam where they would meet.

2)Spray foam the outside of the exterior wall - Cheaper but would this be enough and again would it be OK since the interior is insulated. I think it would since there would still be an air gap between the walls.

3)Blow in cellulose insulation. Cheapest option, but would it be enough plus there is always settling that occurs, maybe combine this with spray foam on the exterior.

4)Some other solution I am missing.

I am attaching one picture I have of the repair which kind of shows what it looks like inside. The exterior wall is just plywood with tyvek on it.
20140109_121452

Duane, Moderator

11:10PM | 01/09/14
Member Since: 11/14/13
75 lifetime posts
It appears you could have 2 problems, one of course as you noted you have plumbing pipes in a unconditioned space and that needs to be corrected. You typically need to install insulation against a ridged air barrier ( outside wall) The issue becomes a dead air space between the outside wall and the existing interior insulation. I can not tell you for sure ( the picture helps but I can not make a determination by it) 1 possibility is to spray foam the entire area to insulate and to take away any air barrier between outside wall and interior wall. This should stop the freezing and the air infiltration that is possible in that area. I would however suggest you have a insulation expert visit the job site and make a determination. You will want to be careful as you do not cause conditions for mold.

Duane,
bobvila.com/ expert moderator
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

captcha
type the code from the image

Anonymous

Post_new_button or Login_button
Register

Deep blue grays like the shade shown in this example "have a nautical, serene feeling," says Amy Hendel, designer for Hend... Built on a rocky island in the Drina River, near the town of Bajina Basta, Serbia, this wooden house was cobbled together ... Large steel-framed windows flood the interior of this remodeled Michigan barn with daylight. The owners hired Northworks A... Edging formed with upside-down wine bottles is a refreshing change. Cleverly and artistically involving recycled materials... A Washington State couple called on BC&J Architects to transform their 400-square-foot boathouse into a hub for family bea... Similar to the elevated utensil concept, hanging your pots and pans from a ceiling-mounted rack keeps them nearby and easy... Few projects are more fun than upcycling a vintage piece in a surprising way. Outfitted with a sink and a delicately tiled... The thyme growing between these stepping stones adds a heady fragrance to strolls along this lush, low-maintenance garden ... Decoupage is an easy way to add any paper design to your switch plate, whether it is wallpaper, scrapbook paper, book page... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Reluctant to throw away any of those unidentified keys in your junk drawer? Hang them from a few chains attached to a simp... A stripped-down model, sans screened porch, starts out at $79,000. Add the porch, a heated floor for the bath, and all the... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp2