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General: Insulating 60s timber frame

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    • CommentAuthorPeter Clark
    • CommentTimeSep 19th 2010 edited
     
    I am having to rethink this, time, money, convenience, winter coming etc.

    Thinking about Evan's proposal to work from the inside. How would you insulate between the studs and on the inside of the studs, while retaining the existing outside arrangements?

    I am thinking of flexible woodfibre insulation push fit between the studs and something dense on the inside, woodfibre board, or dense acoustic rockwool in between battens and plasterboard?

    My concern is that if i take off the plasterboard inside and put insulation between the studs, and then something on the inside, I will be cooling the exterior of the studs and the cladding, so more condensation likely. It has lasted 50 years quite well but really if I make this change i ought to have a ventilated cladding arrangement and/or a vapour barrier inside?

    Your thoughts are welcome, pic below (from the outside).

    Peter
    • CommentAuthortony
    • CommentTimeSep 19th 2010
     
    I would extend the sill with an ali profile or good wooden one then add insulation over the studs and then breather paper and refix the cladding

    I wouldn't worry about upping the insulation internally so long as you use a vapour barrier inside. The brick piers are convenient for hiding the extra thickness of insulation outside.

    Do you an internal skin or is the wall only 100mm thick?
  3.  
    Posted By: tonyI would extend the sill with an ali profile or good wooden one then add insulation over the studs and then breather paper and refix the cladding

    I wouldn't worry about upping the insulation internally so long as you use a vapour barrier inside. The brick piers are convenient for hiding the extra thickness of insulation outside.

    Do you an internal skin or is the wall only 100mm thick?


    Thanks Tony

    The wall here is 4 inch studs with plasterboard and skim on the inside and tarry stuff and cladding out as in pic.

    External is to difficult for me at present, too many things to arrange and pay for, scaffolding etc.

    For between studs and internal insulation of this wall what would you do? What materials?

    Peter
    • CommentAuthortony
    • CommentTimeSep 19th 2010
     
    Inside I would go 100 PUR or XPS or EPS in front of studs then vapour barrier then lining. I would leave the fiberglass where it is.
  5.  
    Posted By: tonyI would leave the fiberglass where it is.


    I had thought that having access to the stud cavity would be an opportunity to massively up the insulation, the stuff that is in there is about 2 inches thick.
    • CommentAuthortony
    • CommentTimeSep 19th 2010
     
    Looked like it was full to me sorry.
    • CommentAuthorTimber
    • CommentTimeSep 19th 2010
     
    Personally (and some might think my aproach is too cautious but here is what I would do.

    If it is IMPOSSIBLE to remove the bituminous felt and direct applied cladding I would consider installing 25 x 25 mm battens to the sides of the studs up against the felt and then install rigid insulation (I know what I normally say) between studs. This will create a 25 mm void that you can introduce ventillation from the outside in to.

    You can then add as much insulation to the inside as you can/want and then install a vcl and wall linings.

    Without the ventillation, the felt becomes too cold (because of the extra insulation) and you might cause a condensation risk. This way you can leave all of the outside alone but still minimise risks.
  8.  
    Posted By: Timber
    If it is IMPOSSIBLE to remove the bituminous felt and direct applied cladding I would consider installing 25 x 25 mm battens to the sides of the studs up against the felt and then install rigid insulation (I know what I normally say) between studs. This will create a 25 mm void that you can introduce ventillation from the outside in to.

    You can then add as much insulation to the inside as you can/want and then install a vcl and wall linings.

    Without the ventillation, the felt becomes too cold (because of the extra insulation) and you might cause a condensation risk. This way you can leave all of the outside alone but still minimise risks.


    Thanks Timber,

    We have had similar thoughts. Practically speaking, there are about 30 or 40 stud 'spaces' to fill with a lot of 25mm battens, I wonder if it would be possible to stick the rigid insulation to the inside 75mm of the studs? Is there a suitable adhesive?

    Peter
  9.  
    Posted By: tonyI would extend the sill with an ali profile


    Hi Tony, or anyone, where could I get aluminium window sill extensions?

    Peter
    • CommentAuthorTimber
    • CommentTimeOct 15th 2010
     
    Peter - I guess you could do that. I think Celotex do a metal z clip that can be used to fit insulation to the inner face of the studs or rafters which may compliment a sticky solution.
    • CommentAuthortony
    • CommentTimeOct 15th 2010
     
    My local metal fabricators will make (fold) to any profile

    Or buy a standard black, white or brown ali one and spray it the colour you want

    they are readily available in central and northern Europe too.
  12.  
    Posted By: tony
    Or buy a standard black, white or brown ali one and spray it the colour you want



    Thanks Tony, i have spent a bit of time googling and phoning, no one is able to sell me these, where could I get one?

    Peter
    • CommentAuthorreefray
    • CommentTimeOct 16th 2010
     
    <blockquote><cite>Posted By: Peter Clark</cite>Hi Tony, or anyone, where could I get aluminium window sill extensions?

    Peter</blockquote>

    Peter these guys could be an option. I found them very helpful.

    http://www.wemico.com/products/sills-flashings.html

    Ray
  14.  
    Posted By: reefray
    Peter these guys could be an option. I found them very helpful.

    http://www.wemico.com/products/sills-flashings.html" rel="nofollow" >http://www.wemico.com/products/sills-flashings.html

    Ray


    Brill, many thanks reefray.

    Peter

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