COMMUNITY FORUM

ErikU19

09:38PM | 01/25/05
Member Since: 01/25/05
2 lifetime posts
Bvhvac
I will be insulating my garage this weekend and have had a couple different people tell me different things. So i'm looking to clear up some things.

The garage is 40X22X12 with walls that are 2X6, and rafters are that are 2X4.

I'm going to use R19 (6 1/2" deep X 15" wide) on the walls, and then drywall over that - no biggy here.

The roof, however, is different. I thought i could just use insulation in between the rafters in the roof, much like the walls, but someone told me that the roof needs to be left alone (no insulation against it) so it is the same temp as outside. which to me seems odd, because owens corning has illustrations of using insulation in rafters on thier web site (the same way i would use them in my garage).

For Example!

[img]http://chaordicconsulting.com/bp/Erik/Pictures/Erik/Houses/10mile/insulation.gif[/img]

I was planning on using R13 Foil insulation (about 1/8" thick) first inbetween the rafters in the roof, and then using R13 fiber insulation over that (remember the rafters are only 3 1/2" thick, so r19/21 is out of the question), and then finally using 2" thick R8 polyboard to cover everything up, giving me a nice white ceiling with a total R value of 34.

Now, will this work?

ErikU19

09:41PM | 01/25/05
Member Since: 01/25/05
2 lifetime posts

theeagle

01:10PM | 01/26/05
Member Since: 11/27/04
174 lifetime posts
this is an attic space ,not for living or storing stuff??

insulate the ceiling with r40 blown in or 3 1/2" inch batt and then 5 1/2" inch batt over that.

insulating the top rafter space is used in hot climates as a way to control temperature in the attic space to reduce heat gain to the living space. attic still needs to be ventillated.

owens corning pic has to do with a livable attic space.


david_wv

09:52AM | 01/27/05
Member Since: 01/28/01
171 lifetime posts
You need air flow to cool and dry the roof sheathing.

You need to buy thin foam troughs that preserve about 1 or 2" gap between the sheathing and the insulation. You can find them in the same aisle as the rolls of insulation.

Make sure you have eave and peak vents so the air can circulate.
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

Few projects are more fun than upcycling a vintage piece in a surprising way. Outfitted with a sink and a delicately tiled... 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... For windows, doors, and mirrors that could use a little definition, the Naples Etched Glass Border adds a decorative flora... 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