COMMUNITY FORUM

VGone

04:37PM | 12/09/03
Member Since: 02/04/03
13 lifetime posts
Bvhvac
I have a question about furnace and overall heating system.
We have washer/dryer(vented outside), gas water heater, forced air gas furnace(combustion intake inside basement, exhaust outside) and water softner in our unfinihsed basement. There is no supply duct in basement. However, it feels quite warm in basement, almost as warm as house, even when there is 30 degree outside. So we are planning to insulate the basement ceiling. The question is, will insulating ceiling affect the furnace functioning? I am trying to find out why it feels so warm and cozy in basement when we don't need that at all! (we dont want to pay for it!) Is it because basement needs fresh air since combustion intake is insise? Could it be because of leaky supply/return ducts?
Thanks for your time.
regards,
-vc


plumber Tom

02:07AM | 12/10/03
Member Since: 05/10/03
810 lifetime posts
Normally basement ceilings don't have a need for insulation. it's more of a soundproofing issue. I'm confused when u say, "WE don't have a supply duct in the basement" Where is the supply duct? Normally the fresh-air intake is taken from the outside, but it's more of a short-cut installers take. Building code would take precedence over that issue, but I have seen intake air taken from the basement. If you insulated the ceiling, your home might then be classified as unusually tight construction. The last thing you would want to happen is starve the furnace of fresh air.

VGone

02:34AM | 12/10/03
Member Since: 02/04/03
13 lifetime posts
Thanks Tom. Some clarification is due. When I said ""We don't have a supply duct in the basement" that meant "There isn't any supply air grill registers in basement to provide heating and cooling". The fresh air intake is tied with return line at ceiling which go to furncae for reheat and distribution. However, the combution air intake is not at outside.
-vc

R Man

12:12PM | 12/10/03
Member Since: 12/09/03
7 lifetime posts
VGone,

I have a similar system in my basement. The furnace draws ambiant air from the basement and there are no supply vents in the basement, yet it isn't cold down there.

If your furnace is like mine, there is warm air being blown out the top of the heating unit. You can feel it when it's running.

If you have a relatively new house, the basement will be well insulated. I have a walk-out with windows and glass french doors and it still stays warm, even with the blinds blocking the sunlight.

However, I think you may have a problem if you finish the basement. You will probably end up isolating the furnace from the living space, thus eliminating what little heat is blowing out of the top of the furnace. In that case you will have to tap into the existing ducts with small diffusers to bring heat into the finished space. It's not a big deal, but it will reduce conditioned air pressure upstairs. That's why the basement vents must be either small or adjustable or both. Your furnace is sized for the first floor, not both floors.

If you end up walling off the furnace, make sure that all doors leading to the furnace have vent louvers so you don't starve the furnace of air or create a CO2 problem. A lack of supply air to the furnace and water heater will result in both of them drawing air DOWN the combustion stack, resulting in dangerous levels of CO2. Modern furnaces have an air sensor that will shut the unit off if the exhaust vent isn't drafting.

Good luck.

VGone

04:01PM | 12/10/03
Member Since: 02/04/03
13 lifetime posts
R Man:
Man oh man!! You know, in fact I did find few gaps (each corner of a rectengular duct) at top of furnace (Janitrol 92.6% eff.) from where it is connected to the main supply duct. I thought I found a glitch where warm air was leaking out in quite a high velocity and guess what, I sealed it with a weatherstrip tape!!!! Basement was still warm and cozy.

However, I think your reply clearly answer my concern about isolating furnace who is sucking in air form basement. I'm just hit with a new gas bill which quite fascinating(and its just Novemeber!) and I am trying to lower it down.
Thanks for sharing your thoughts.
-vc
Madison, Wiscosin.

PS: What do I need to in order to get a reply from HK )


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