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Old 08-24-2018, 10:26 PM   #1
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Foamboard Insulation


All,


looking for feedback on my plan to use Thermasheath Rmax-3 foam board insulation from home depot for the ceiling of my kitchen / living room. as you can see by the attached pictures i have no attic or soffits in this room, what you see is the 2x6 tongue and groove deck boards above, above that is felt and shingles. my thought was to run a 2 inch then a 1 in boars for total of 3 in up against the 2x6 decking, then drywall it, all this in between the beams (wife wants to be able to see at least 4 inches of them). As you can tell I i have a odd room, house was built in '74 and poorly insulated,. Looking at home depots website, the total combined 3 inches should give me about R-19, which for a room that has none is an improvement. I have all the tools and ability to do it myself, not worried about that part. I live in San Diego CA, never get snow, so i don't think i need to be too concerned about moisture right?


thank you for taking the time,


R,
Trevor
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Old 08-24-2018, 10:54 PM   #2
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Re: Foamboard Insulation


How old is the roof , I think it would be better on the top side.
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Old 08-25-2018, 12:14 AM   #3
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We just did a complete re roof last winter, I had 11 leaks during the last major rains last winter.
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Old 08-25-2018, 02:09 AM   #4
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Re: Foamboard Insulation


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Originally Posted by da_offroadnut View Post
We just did a complete re roof last winter, I had 11 leaks during the last major rains last winter.
Likely the biggest problem is sealing it completely from air from the house.
Experts are talking about it.
https://inspectapedia.com/ventilatio...nted_Roofs.php
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Old 08-25-2018, 10:24 AM   #5
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Re: Foamboard Insulation


Yep been doing a lot of reading about unvented roof possible issues, i'm still thinking due to where i live in southern Cali I may be good. I was going to use can foam in between the boards and beams and tape all seams if that matters.
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Old 08-25-2018, 10:34 AM   #6
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Re: Foamboard Insulation


I assume you use air conditioning?
In your climate there is a cost associated with insufficient insulation and that cost can be estimated. The benefit of knowing that number is to judge the value of adding that insulation as you explained. A project that costs $1,000 and saves you $50 a year would be considered to have a simple payback time of 20 years, not necessarily a good investment.

An energy auditor can do that for you or there are online programs if you are digital.

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Old 08-25-2018, 10:54 AM   #7
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Re: Foamboard Insulation


Yes us AC, the entire HVAC system was replaced 3 years ago when the original system died. over time i have added insulation in the attic for the bedrooms and hallway, so the rest of the house is comfortable. Just this part of the house, not worried about pay back, we run the AC a lot due to my wifes health issues, any way i can reduce that run time will drop my electric bill.
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Old 08-25-2018, 11:59 AM   #8
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Re: Foamboard Insulation


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Originally Posted by da_offroadnut View Post
Yes us AC, the entire HVAC system was replaced 3 years ago when the original system died. over time i have added insulation in the attic for the bedrooms and hallway, so the rest of the house is comfortable. Just this part of the house, not worried about pay back, we run the AC a lot due to my wifes health issues, any way i can reduce that run time will drop my electric bill.
Found this about Florida
https://buildingscience.com/document...tion-tiles-and
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Old 08-26-2018, 05:16 PM   #9
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Re: Foamboard Insulation


thank you for the link, read the whole thing, if i'm understanding correctly as long as i use non permeable foam board i should be good?
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Old 08-26-2018, 05:37 PM   #10
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Re: Foamboard Insulation


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Originally Posted by da_offroadnut View Post
thank you for the link, read the whole thing, if i'm understanding correctly as long as i use non permeable foam board i should be good?
I think that would mean a good seal around the edges too.
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