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Spray foam insulation
Posted on 1/19/14 at 4:19 pm
Posted on 1/19/14 at 4:19 pm
Has Anyone here recently built a new home and elected to go with spray foam instead of the traditional insulation? What size did you go with?
What are negatives of it besides price?
I have read alot of people in the south will spray exterior walls and joist but use traditional insulation in attic because the attic is ventilated. ..does this sound correct?
What are negatives of it besides price?
I have read alot of people in the south will spray exterior walls and joist but use traditional insulation in attic because the attic is ventilated. ..does this sound correct?
14
Posted on 1/19/14 at 4:25 pm to slapahoe
quote:
I have read alot of people in the south will spray exterior walls and joist but use traditional insulation in attic because the attic is ventilated. ..does this sound correct?
These days, I have heard a lot of people do this.
But I've also read that if you spray your rafters and put plywood over, it well help with overall efficiency, I could be wrong with that. But since your attic isn't holding heat or cold its easier to heat and cool the leaving space, whether you use the attic for living or not.
Posted on 1/19/14 at 4:27 pm to slapahoe
I built my house a couple years ago. I did a lot a research into foam and really wanted to do it. I ended up not just because it was my first time subbing out a house and I had a fine line to walk.
I wouldn't do it unless I did both the exterior walls and the roof. Would be a waist of money otherwise IMO.
I wouldn't do it unless I did both the exterior walls and the roof. Would be a waist of money otherwise IMO.
Posted on 1/19/14 at 4:30 pm to MadtownTiger
quote:
if you spray your rafters and put plywood over, it well help with overall efficiency
I've got a customer that did this when they built their house. I will do when I build.
Posted on 1/19/14 at 4:30 pm to slapahoe
quote:
I have read alot of people in the south will spray exterior walls and joist but use traditional insulation in attic because the attic is ventilated. ..does this sound correct?
Haven't come across this. Think about your attic(where most air handlers/furnaces are) being only 85 degrees at max, that's what they claim. The unit will work a lot less to do the job. The bring in fresh air through vents for any gas using units.
Posted on 1/19/14 at 4:32 pm to Who Me
I know a few people who have it and they all said that besides the price it was one of their favorite things about their house. I'm wondering what kind of price range I'd be looking at for at 2500 Sq ft house. I have heard as little as 5k more than regular to double the price of regular insulation
This post was edited on 1/19/14 at 4:34 pm
Posted on 1/19/14 at 4:33 pm to slapahoe
Built in '08 and spray panes the entire home. Electric heat and hot water heaters. No vents in the roof or soffits. 21 sear, 2 stage HVAC system that runs on temp and humidity points. Home is 2600 sf and a neighbor built a smilar sized home with traditional insulation. We averaged $125 per month lost year they were running $340...
Ran into issues with rot around a door due to condensation...
I have been more than pleased with the choice.
Ran into issues with rot around a door due to condensation...
I have been more than pleased with the choice.
Posted on 1/19/14 at 4:35 pm to wickowick
If you don't mind can you give me a price range? My house will be similar in size
Posted on 1/19/14 at 4:37 pm to slapahoe
If I build another I will definitely go with foam. A coworker of mine has it and it's pretty impressive to see his utility bills.
You want to do the roof if you are going to do it. It is going do change how you do a few things though.
The attic will not be ventilated like a normal attic. It will be sealed. Will need knee walls erected through the attic to separate the air conditioned spots of the house from the non-air conditioned areas. It will cause the attic to be a semiconditioned space with a temperature within about 8 degrees of your living area.
One thing to be careful with is the air conditioning units. You don't want to put too strong of a unit as it wil short cycle and not properly ventilate the house which is where you would get moisture problems.
You want to do the roof if you are going to do it. It is going do change how you do a few things though.
The attic will not be ventilated like a normal attic. It will be sealed. Will need knee walls erected through the attic to separate the air conditioned spots of the house from the non-air conditioned areas. It will cause the attic to be a semiconditioned space with a temperature within about 8 degrees of your living area.
One thing to be careful with is the air conditioning units. You don't want to put too strong of a unit as it wil short cycle and not properly ventilate the house which is where you would get moisture problems.
This post was edited on 1/19/14 at 4:39 pm
Posted on 1/19/14 at 4:38 pm to slapahoe
I want to say i negated down from $1.65 to $1.35 sf. I sprayed the attic, walls under the home and between the floors in a portion of the home (waste) should have used something else for noise reduction.
Posted on 1/19/14 at 4:41 pm to slapahoe
I still managed to do an energy efficient home without the foam though.
There are plenty of other things you can do to make your home energy efficient.
I have over 2300 living area and my energy bill runs around $125-$150 through the summer.
There are plenty of other things you can do to make your home energy efficient.
I have over 2300 living area and my energy bill runs around $125-$150 through the summer.
Posted on 1/19/14 at 4:42 pm to Who Me
2500 htd Sq ft
Foam insulation
thinking of putting 2 separate 3 ton units. This should be plenty right?
Foam insulation
thinking of putting 2 separate 3 ton units. This should be plenty right?
Posted on 1/19/14 at 4:43 pm to slapahoe
I had closed-cell foam sprayed under my house between the floor joists (house is on piers). Cost me about $1/sq.ft.
Posted on 1/19/14 at 4:44 pm to wickowick
quote:
should have used something else for noise reduction.
Best noise reductor I've found was celotex board wit rock over it. The rockers bitch, but hey.
Posted on 1/19/14 at 4:45 pm to slapahoe
That's definitely plenty for a foam and probably too much. Definitely sit down with a lot of a/c guys and get their advice.
The House kinda becomes a foam icebox. It doesn't take as much tonnage to keep it cool.
But you absolutely must get 2 stage units.
The House kinda becomes a foam icebox. It doesn't take as much tonnage to keep it cool.
But you absolutely must get 2 stage units.
Posted on 1/19/14 at 4:50 pm to Who Me
I put one of my air handlers under the home with a 12x12 fresh air vent. Home has positive pressure...
Posted on 1/19/14 at 4:51 pm to slapahoe
Where are you located? A good buddy of mine is a sales rep in the spray foam business on the Northshore.
Posted on 1/19/14 at 5:09 pm to 4LSU2
My walls are ICF and spray foam in the rafters. My bills run about $300 summer conditioning 4000 sqft. Also run pool pumps that probably run me well over $100 a month. In the summer I can go and hang out in my attic.
Check your roof shingle warranty. Plenty of companies have clauses that allow them to wiggle out if you spray foam rafters.
Check your roof shingle warranty. Plenty of companies have clauses that allow them to wiggle out if you spray foam rafters.
This post was edited on 1/19/14 at 5:11 pm
Posted on 1/19/14 at 5:17 pm to Art Vandelay
I looked into it but I'm probably still going to go with blown fiberglass. not sure how long ill be in this house and don't know if ill ever see the realized savings in energy bill
Posted on 1/19/14 at 6:23 pm to slapahoe
I did the whole house when I built.
The house has two separate walk-in attics. One is basically is full of mechanical equipment, the other is storage. They both stay about 10 degrees cooler than the rest of the house. We moved in right before New Years, but the whole house stays very comfortable with minimal heating. We did not ventilate attics at all, thus we used electric hybrid hot water heaters. These suck and I just run them in electric mode.
Not sure what you mean by size? Open cell vs. closed cell?
The house has two separate walk-in attics. One is basically is full of mechanical equipment, the other is storage. They both stay about 10 degrees cooler than the rest of the house. We moved in right before New Years, but the whole house stays very comfortable with minimal heating. We did not ventilate attics at all, thus we used electric hybrid hot water heaters. These suck and I just run them in electric mode.
Not sure what you mean by size? Open cell vs. closed cell?
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