03:33PM | 08/01/05
Member Since: 07/31/05
2 lifetime posts
I am working on an old home built around 1866. We are adding an ADA bathroom in a back area of the house. This requires permits. A lot of the lath and plaster was shot so we took it off and plan to drywall in this back room only. I am sure we are required to insulate the exterior walls. Our concern is will insulation promote rot, mold or fungus? There is clearly air space from the outside of the house. Old houses last so long because they breathed and the water that got in got out. Does insulation trap in the moisture? What type of insulation should I use?


08:35PM | 08/01/05
Member Since: 11/27/04
172 lifetime posts
being an old house i would just put a standard batt of insulation in. no vapor barrier or craft paper face. unless code says so.

let the old place breath since you won't be doing the whole place.

insulation does not support mold as it has no organic matter.

new houses have bad areas due to allowing moist air from inside to freely go into the framing and condence on the outer cold wall. air spaces need to left in the outer sheathing to allow the moisture out. its not amatter of rain getting into the wall but moisture getting out from the inside. i keep my home at 40% or lower humidity , as well as using exaust fans in the bathroom and kitchen.

Remember the past or all is lost.


07:08AM | 08/02/05
Member Since: 04/25/05
1915 lifetime posts
We don't know the climate nor do we know the what the exterior siding is or if there is any kind of weather barrier on it.

Installing batt insulation without controlling moisture flow from the inside can cause more damage. With out the heat flow the exterior wall will be colder and the moisture can condense.

I really don't know enough about old house to make any suggestion.

You might look at and look in the papers and research to see if they cover old houses.

Also Taunton has a book on weatherization and insualation. Again I don't know if would cover older house like this.


12:30PM | 09/02/05
Member Since: 08/14/05
18 lifetime posts
I have a house built around 1908 in southern Jersey (my best guess) with almost no insulation and a mold problem in the basement (I am working on this one myself).

I am having the old insul-brick (put up in 1945 - I think) taken off and rigid foam insulation without a mositure barrier and vinyl siding put up...possibly over the original calpboard in some places.

I want to insulate the walls and ceilings but am very concerned about trapping mositure in the wall. I don't want to use the foam insulation for fear of my very fragile plater walls. What do you think about blown in cellulose? Will it trap the moisture?

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