+ Reply to Thread
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 26
  1. #11
    Join Date
    Jan 2008
    Posts
    21

    Default Re: Replace Fiberglass Insulation with Foam

    Location is North Carolina.

    I agree on not using open cell in the attic due to roof leaks. At least the is what I have read.

    Yes, the contractor did say spraying the roof deck would also require spraying the gables. But in my case, that would not cure the air leaks around the T&G boards.

    I have watched a few videos from companies that sell foam applicators. TigerFoam for one. It did not appear to be spraying at a high psi. Also the spray gun was no more than twelve inches from the area being foamed.

    Are there any tricks or special spray gun nozzles (long or curved nozzle) that allow you to get into tight areas such as where the roof trusses attach to the ceiling rafters?

    I really do not want to DIY the type of work, but I may have to if no ones wants to do the work.

    I have calls in to two more contractors.

  2. #12
    Join Date
    Jun 2007
    Location
    Erie, PA
    Posts
    51

    Default Re: Replace Fiberglass Insulation with Foam

    North Carolina is in Zone's 3 4 & 5
    according to the IRC (international residential code 2006) recommended r-value is 30 for Zone 3 and r-38 for zone 4 & 5 so the r-20 isn't enough insulation

    tiger foam is more for small projects, you want to have a professional for this job

  3. #13
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Replace Fiberglass Insulation with Foam

    Quote Originally Posted by Earnie View Post
    The flat ceiling will be easy and the one being looked at today. The other half of the ceiling is sloped and consists of 2x12's with kraft faced batting between them. T&G boards on the inside/ceiling and roof decking on top (I hope there is a gap for venting). I am almost positive that it will be impossible to remove the batting and spray foam in the cavity.

    The roof will need replacing in the future. My thought is to have the roof decking removed. pull out the batting, then spray foam to the ceiling T&G boards. Again this would seal the T&G board gaps.
    Earnie ....perhaps I'm missing something here.

    You mention removing the roof sheathing and applying whichever insulation from the top side.

    To my thinking this is an expensive way of simply adding insulation to an attic space. The other thing that would concern me would be having the roof open to the elements.

    You would have to have incredible timing and cooperation between the roofers , the insulation contractor and of course mother nature. The roofing would be removed completely then the insulation applied immediately with the new roof being applied immediately after the insulation is installed.

    Not that it can't be done but there will be a lot of people on that roof and with it opened hopefully the weather doesn't rain.

    In my thinking it would be more logical to do the insulation from the inside.
    Considering there are 2x12 rafters provides plenty of options for achieving adequate insulation.

    Baffles can be installed to the underside of the roof sheathing which will provide the air space. The baffles can be either ones purchased or made from 2x2 nailers on the rafters with foam sheets or plywood attached to the nailers.
    Insulation can then installed from the baffles to as deep as you wish ... regardless of bat or spray foam.

    This can be done without concern to what the weather is outside.

    The thing that will prevent you from DIY is the reluctance of removing the T&G in the attic.

    Just my 2 cents


    btw .... for the record ... I hate and don't use duck ( aka duct ) tape.

  4. #14
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,821

    Default Re: Replace Fiberglass Insulation with Foam

    Quote Originally Posted by canuk View Post
    The thing that will prevent you from DIY is the reluctance of removing the T&G in the attic.

    Just my 2 cents
    Read it again Canuk. The T&G is o his ceiling below the attic, but he hasa open cracks and is afraid yhat the foam will come through to the room below.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  5. #15
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Replace Fiberglass Insulation with Foam

    T&G boards on the inside/ceiling and roof decking on top (I hope there is a gap for venting).
    Perhaps I'm misinterpreting what is meant by this. I was thinking the ceiling of the attic is also covered by T&G. If that's not the case then this should be easier to do from the inside.

    I do recall the floor/ceiling of the bedroom being T&G.

  6. #16
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,821

    Default Re: Replace Fiberglass Insulation with Foam

    Canuk,
    And it didn't take a 300 word dissertation to explain it.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  7. #17
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Replace Fiberglass Insulation with Foam

    Quote Originally Posted by JLMCDANIEL View Post
    Canuk,
    And it didn't take a 300 word dissertation to explain it.
    Jack
    What are you saying ??

  8. #18
    Join Date
    Jan 2008
    Posts
    21

    Default Re: Replace Fiberglass Insulation with Foam

    Guys, my point is this.

    We live in this house. The T&G ceiling boards are pine wood, stained and sealed. Yes, some do show signs of not being completely tight together, hence the thought that we are loosing conditioned air up through the gaps into the attic.

    To re-insulate a sloped ceiling from the inside requires ripping down lots of T&G boards inside the house. Not to mention the dust, dirt, fiberglass insulation that will be falling into the house.

    To me, it makes more sense to remove the roof decking, then the fibeglass insulation between the rafters, and then install spray foam thereby sealing the T&G gaps. When we re-roof, its just one more (expensive) step to remove the roof decking, then replace it.

    Time sensitive, you bet. Expensive, very. I wasn't the one who constructed this, nor was I the inspector who allowed this to pass who knows what county or state energy efficiency codes. I just have to deal with it.

    Thanks for the valued input. Please keep posting if you have any other thoughts. I have gleaned much from you replies.

  9. #19
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Replace Fiberglass Insulation with Foam

    Earnie .... gotcha.

  10. #20
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,821

    Default Re: Replace Fiberglass Insulation with Foam

    Earnie,
    I have a story and a half also so I know what you're talking about. I think you have the right idea for handling the slanted part of the ceiling. It will be a pain and I wish you all the luck.
    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •