Re: Have several issues- need advice
Unfortunately this is a common problem where the builder hasn't sealed and insulated properly.
Originally Posted by stefaka
Basically the insulation and air barrier wasn't done correctly along with possibly improper ducting...... hard to tell over the internet.
Even though the floor is insulated ( from underneath in the garage ceiling ) with fiberglass batts it likely wasn't done correctly. There is an avenue somewhere under the floor where cold air is able to infiltrate and cool the floor.
You mentioned the backside of the walls for this space open up into the garage?
I would also suspect this area isn't properly sealed and insulated.
Spray foam would be benifical for this situation.
Frankly ... it should have been done since the foam will provide insulation as well seal air infiltration. The air seal is important ... not only for comfort ... but ... the fact this room is over the garage where carbon monoxide from car exhaust can make it's way into that space.
No... it's not normal.
My next issue is I have cold air coming in through a return air vent on 3rd floor (attic space behind vent) and it moves down the stairs to the 2nd floor and into my daughters bedroom. I also have cold air coming in through an air supply vent in my master bedroom sitting area. This vent is in one of the kneewalls. Is this normal?
There's either openings in the ducting allowing the cold air from the attic spaces to enter .... or ... they hadn't sealed the opening around the duct grill and the wall.
Are the furnaces located in the attic space?
It's unclear as to the design of the zone system .... though what you describe seems to be velocity noise ..... whether it's from damper openings or undersized ducting or leaking ducting is hard to say for sure
Lastly I have a forced air zoned (1 for each of the three floors in my home) furnace system. Regardless of which furnace turns on at least for the 1st and 2nd floors there is a whistling sound the entire time it is on, but once the thermostat clicks to turn it off (there's a few seconds before it actually goes off) the noise stops. Could this be ductwork, gas pressure issue. I can hear the whistling noise perhaps in several of the walls but it may be an echo going on throughout the ductwork. Any ideas?
Ideally there should be air returns in each room ( with exception of bathrooms and kitchens ) to assist with circulating the conditioned air. However ... without an air return the supply duct will be pushing air into that room and pressurizing the space. This is positive pressure which can eventually restrict the amount of air being delivered by the supply ducts into that room because there is no relief.
Also I have read about negative pressure in rooms without return air vents and to open doors to help the room heat better. What is this all about?
In a balanced system there should be a return duct drawing an amount slightly less the amount of air being delivered by the supply duct .... this not only relieves the pressure but also helps circulate the air. The return vents should be located at floor level ( for heating ) to draw cooler air from the lower area of the room which also creates air turbulance helping to draw the warm air down.
Sounds as though there has to be some rework to the insulation , air sealing and heating system .
Considering this home is only 2 years old ... I would be all over the builder or warranty insurers ... like a tick to a hound to correct these issues.
Hopefully this helps.
"" an ounce of perception -- a pound of obscure "