COMMUNITY FORUM

retired99

12:31PM | 09/30/12
Member Since: 09/30/12
1 lifetime posts
Bvhvac
My 1890 home has severe ice dams every year which I understand are caused by poor attic insulation, ventilation and air leaks from the floor below. I have already installed soffit (sp?) vents & ridge vents and I'm ready to start on insulating, but I face one really big problem. There are 4 large roof valleys (the house is shaped like a cross), and in these areas the are no vents and the rafters are such that they block air circulation. Ice dams are most severe here. So I need some ideas: is it best to air-seal and insulate the floor, insulate directly on the roof, or insulate the floor and also the valley areas directly leaving the rest of the roof alone? I have already identified many air leaks including the stairway up, but probably not all yet. I haven't found much on-line about roof valley problems in older homes. I also though about putting in fans but eventually we want to put 2 rooms in the attic so insulating has to be compatible with this.
Img_0121

Perry525

01:38PM | 10/05/12
Member Since: 10/05/12
1 lifetime posts
Ice dams are caused by heat from your home melting the snow on the roof.

Where you chose to place your insulation is your choice.

You may choose to fix insulation between the rafters and below the rafters, this is a difficult task and it will require a lot of insulation. But if you do intend to have rooms in the attic, this is the only way to go. You must have insulation below the rafters, followed by a water vapor proof plastic sheet, finished with drywall. Are the attic joists strong enough to make the floor of a bedroom? HAVE YOU ENOUGH HEAD ROOM?
Adding steel beams etc will make this a very expensive project.

The alternative, insulate between the joists and below or above the joists, this uses less insulation.

From the points of comfort and cost, keeping the insulation as close to the present comfort zone as possible, not only uses less insulation it also saves money on heating.

You fully understand that a lot of the heat that escapes from your home is due to the stack effect and the passing wind that pulls the heat through your roof.

Ensuring that all holes into the roof are blocked is a priority, then insulate the access to the roof and make sure the access is water vapor tight.

A desirable feature is sheets of polystyrene fitted below the joists with a water vapor proof plastic sheet fitted below the polystyrene followed by drywall to finish.
This will solve you problem, but it is messy and takes time, it also requires an empty room below to work in.
If you do get round to adding rooms in the attic, then this will stop them from overheating.
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

Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Reused steel windows create an eye-catching splashguard in this walk-in shower. The vintage factory windows bring an inter... A galvanized steel tub is a surprising but charming fixture in this bright and breezy screened patio. It's perfect for was... 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... If you lack plumbing skills but have a good sturdy tree, here's the easiest outdoor shower solution of all: Simply attach... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... How do you like this smart use for an old bottle? Clamp an empty wine bottle to a fence or wall near your outdoor deck or ... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... 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... 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