Forum Archive Index - May 2003

["tennyson@caverock.net.nz" <tennyson@caverock.net.nz>]

Hi MacDunk,

A nice cheerful post from you ;-)

>
>
>  EX a plaster type wall over a  timber frame is a complete 
> disaster regardless of who the builder is. 
> The basic reason is it is supposed to be water tight that means air
> tight.  The air pressure outside the wall is greater than the pressure
> inside, and that wall will even suck water uphill.  
>

So what do you think of those pressurised fan systems that mount in 
the ceiling  and allegedly pressurise the entire house?   Are they a 
cure for this?

>
>Add to the fact
> the down pipes are screwed with clips through this shell and there is
> the first leak.   Timber must breathe was the first thing I was taught
> as an apprentice.    They choke the wall up with insulation like it
> was the artic circle 
>
>

Well yes but if you start leaving holes in the insulation it kind of defeats 
the purpose doesn't it?  What is your solution?   Have no insulation at 
all in the walls?

>
>when in actual fact most of the heat is lost
> through the windows double glazing is more sensible. 
>

I agree that most homes would be well served by double glazing.

>
> The real disaster comes with the sealant breakdown
>  Its only good for  ten years max,
>  and all it takes is a pin hole for water to be sucked in to rot
> untreated timber.    Dry and wet rot plus other fungus health hazards
> take over after that.
>

Can you explain what sealant you are talking about?

>
>  Simple rules to follow brick veneer is best followed by
> weatherboards after that it is dangerous territory 
> 

By brick veneer, do you mean a single layer of bricks built outside a 
timber frame?   I think you are saying that it is more than likely some of 
the joins between the bricks are going to be imperfect so a limited 
amount of ventilation is inherent in this build process.   If this is what 
you mean, why not just drill few tiny holes in the plaster type walls at 
critical places.  Wouldn't that fix it?

SNOOPY



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