COMMUNITY FORUM

fixit

06:36PM | 12/12/03
Member Since: 08/15/03
7 lifetime posts
Bvbasement
How many soffit vents I need for my attic?
Where can I find the R Values for NY state?

Length of attic = 52 ft
Width of attic = 22 ft
Height of attic = 6 ft

pgriz

10:42AM | 12/17/03
Member Since: 01/21/03
66 lifetime posts
The ventilation rule I follow is to provide 1 sq.ft. of ventilation for every 150 sq.ft. of attic space. This needs to be balanced, so that 50% of ventilation forms the inlet at the soffits, and 50% forms the outlet at the vents. Perforated soffits have different degrees of penetration, some have as little as 0.01 sq.ft. of ventilation for every sq.ft. of soffit, and some have higher number up to 0.06 sq.ft.

Your attic is 52x22 = 1144 sq.ft. requiring 7.6 sq.ft. of ventilation (1144/150). 50% (or 3.8 sq.ft.) needs to come from the soffits. The perimeter around your house is roughly 150 ft. (52+52+22+22). Assuming that you have a soffit 1 ft. wide, you have about 150 sq.ft. of soffit. If you install ventilated soffits having clearance of about 0.03 sq. ft., you will have 4.5 sq.ft. (150 x .03) of effective ventilation, which is just a bit bigger than the 3.8 sq.ft. you need.

Is this what you were looking for?

Piffin

01:21PM | 12/27/03
Member Since: 11/06/02
1281 lifetime posts
None of the "experts" agree on this one, but I usually see recommendations of one foot for every 100 to 150 SF of living space. It should be ballanced so there is as much exiting the ridge vent as ther is coming in the soffits or it will be next to worthless, but not cut in half.

In other words, if you have a thousand feet of living space, I would put in ten SF of soffit vent and ten SF of ridge vent.

If you use typical 2" soffit on both sides and 4" ridge, you will exceeed that.

[This message has been edited by Piffin (edited December 27, 2003).]

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

With technology similar to that used by keyless ignition cars, the Kevo communicates with your iPhone via Bluetooth or a k... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... For some decorative recycling, consider burying old bottles upside down to create edging for your garden beds and walkways... Chocolate-colored walls and large window frames allow the exposed wood beams to take center stage in this small screened p... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... 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... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... Like no other floor type, a checkerboard design works wonders to underscore the retro kitchen theme. Vinyl flooring, ceram... 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... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... If you put the washing machine in the mudroom, you can stop the kids from walking through the house in dirty, grass-staine...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp2