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re: Any OTers have foam insulation in their house?
Posted on 5/16/14 at 4:32 pm to B&TCoonhound
Posted on 5/16/14 at 4:32 pm to B&TCoonhound
A neighbor and I built similar 2 story new construction homes in 2007 ~2600sf. Pier and beam foundations on both homes. He put in Rock Wool insulation, I'm not sure the type of a/c's he installed.I put in spray foam and 21 sear A/Cs with 2 stage blowers. You want an a/c unit that runs on both a temp point and a humidity point. I sprayed everything, ceiling walls and under the home and my electric bill averages ~$160 year round. I can go in the attic in the middle of summer and the it is 84 degrees. I paid about triple in insulation cost that he paid...
2
Posted on 5/16/14 at 4:35 pm to wickowick
Also if you go with foam, no roof vents of any kind and if you are running gas you will need to bring in fresh air or put the gas items somewhere that is non insulated like the garage...
Posted on 5/16/14 at 4:37 pm to wickowick
Really the only downside to foam is the initial cost
It pays for itself if you're in the house long enough.
If I was a contractor building spec houses, I wouldn't use it, just due to cost. Most people won't understand why my house costs more.
It pays for itself if you're in the house long enough.
If I was a contractor building spec houses, I wouldn't use it, just due to cost. Most people won't understand why my house costs more.
Posted on 5/16/14 at 4:50 pm to B&TCoonhound
Had it done in m new construction attic, roof and walls. 3200 sq living Entergy bill has not been over $200.
Swear by it...
Swear by it...
Posted on 6/3/15 at 8:16 pm to VetteGuy
How thick is the open cell foam in your attic? I just got a quote for 5.5 inches of open cell which equates to an R value of R20. Is spray foam that much better that it doesn't need to be the same R38 that is recommended for fiberglass?
Posted on 6/3/15 at 8:44 pm to B&TCoonhound
My parents just built a house and had the foam put in. After a few months, they wanted to sue the contractor because they had mold. I told them to get a dehumidifier and it solved their problems. Make sure you have a dehumidifier in the budget.
Posted on 6/3/15 at 9:02 pm to B&TCoonhound
About to start to build a 3200 sq ft house - 2600 down and 600 in a bonus room above the garage.
I have always heard foam is a lot more but I haven't heard a firm dollar amount.
Ballpark - what am I looking at if I do foam right? Is it really triple the price?
I have always heard foam is a lot more but I haven't heard a firm dollar amount.
Ballpark - what am I looking at if I do foam right? Is it really triple the price?
Posted on 6/3/15 at 9:04 pm to Jimbeaux28
Just got a quote for a 2700 sq foot two story home and it was about $9500 to do the attic and exterior walls with open cell foam.
Posted on 6/3/15 at 9:05 pm to daviddsims
I have heard closed cell is more expensive but better for attics.
I guess if they were quoting open cell in the attic, it is ok for the attic
I guess if they were quoting open cell in the attic, it is ok for the attic
Posted on 6/3/15 at 9:15 pm to B&TCoonhound
I bought a house back a few years back that was built in the mid 90's. I had foam sprayed in the attic like 2 summers ago and my electric bill has never been over $150. It's expensive on the front end but it pays off.
Posted on 6/3/15 at 9:27 pm to Jimbeaux28
Another question I have - can I do spray foam in the attic rafters and rockwool on the exterior walls?
Posted on 6/3/15 at 9:31 pm to B&TCoonhound
My current home is modern. So no need. But we put it in our last house which was pier and beam and 100 years old. It made a huge difference. The house almost wasn't livable prior to doing it.
Posted on 6/3/15 at 10:09 pm to Jimbeaux28
Do not under any circumstance put closed cell in your attic. If you get a leak, you won't find out until it is too late.
To the guy who's parents needed to buy a humidifier, the contractor or HVAC guy screwed up and A/C tonnage is too much.
To the guy who's parents needed to buy a humidifier, the contractor or HVAC guy screwed up and A/C tonnage is too much.
Posted on 6/3/15 at 10:12 pm to B&TCoonhound
quote:
I have a construction company, but always put rockwool, fiberglass, etc. in my houses. For my personal house I'm looking at spraying in foam? My only concern is condensation. Anyone have any good/bad experience with spray foam? TIA
A house I built in the past we used Icynene insulation in the walls and on the backside of the roof decking. The ceiling was uninsulated.
It worked fantastic and the attic becomes a "tempered" space about 10-15 degrees hotter than the climate controlled space but with a humidity level much like the climate controlled space.
Icynene at the time was pretty expensive but long term it would pay off. We saw utility bills one half of similar sized homes.
Sealing infiltration losses can realize significant savings.
Only downside I am aware of with insulating the backside of the roof deck this way is perhaps losing some shingle life due to the shingle temp being higher as the shingles cannot radiate heat off the backside.
Posted on 6/3/15 at 10:17 pm to BiggerBear
quote:
My parents just built a house and had the foam put in. After a few months, they wanted to sue the contractor because they had mold. I told them to get a dehumidifier and it solved their problems. Make sure you have a dehumidifier in the budget.
The A/C must be properly sized for the space and with completely foamed walls and backside of roof deck your A/C load will be much less and should be taken into account when sizing the A/C.
Mold/mildew/moisture problems are telltale signs of an oversized A/C system.
In a tight house bathroom vents should also have humidistats so they run when any shower or nothing takes place.
Posted on 6/3/15 at 10:21 pm to saderade
Entire house is foam. Walls are SIP though... Wilserve did it and did an excellent job. Their rep was very helpful with the ventilation requirements and such.
House is 3800SF...actually the entire inside area under roof is conditioned so it's actually a bit more than that for the A/C. Highest summer bill has been around $180.
Didn't we do this thread last week?
House is 3800SF...actually the entire inside area under roof is conditioned so it's actually a bit more than that for the A/C. Highest summer bill has been around $180.
Didn't we do this thread last week?
Posted on 6/3/15 at 10:29 pm to AndyCBR
quote:
In a tight house bathroom vents should also have humidistats so they run when any shower or nothing takes place.
Meh... my house is as sealed as a house can get and I don't have that stuff... or any moisture problems.
I do have a sweet HVAC system though.
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