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Posted by tbasc@bellsouth.net on January 21, 2007, 11:00 pm
marson wrote:
> Bobk207 wrote:
> > hawgeye wrote:
> > > "Robert11" wrote...
> > >
> > > > Have a house with T1-11 (plywood panel type of stuff) siding on it, which
> > > > isn't in the greatest of shape.
> > > >
> > > > In the Spring, will be having the typical horizontal Cedar Clapboards
> > > > installed.
> > > >
> > > > The two contractors we've had over both said to place the new clapboards
> > > > right over the existing T1-11.
> > > >
> > > > Have two questions, please.
> > > >
> > > > One of the contractors says he uses "AYE" quality level cedar clapboards.
> > > > Guess there are different "quality levels" for this stuff.
> > > >
> > > > a. Is this AYE grade what we want ?
> > > > Are there "better" cedar siding grades to consider, or is this what
> > > > most
> > > > folks use ? Brands, etc. ?
> > >
> > > Aye is about the best grade therefore it costs more.
> > >
> > > > I've asked for pre-primed clapboards, but is there anything else I should
> > > > be
> > > > specifying ?
> > >
> > > The type of nails.
> > >
> > > > b. Surprisingly, one of them said he does not like Tyvek, and has had
> > > > poor
> > > > results with it.
> > > > He wants to use #15 Felt between the existing T1-11 and the new
> > > > Clapboards.
> > > >
> > > > I was under the impression that Tyvek was a sort of "standard" these
> > > > days.
> > > >
> > > > Would sure appreciate any thoughts on this propoised use of #15 Felt
> > > > rather than Tyvek ?
> > >
> > > The felt is cheaper and easier to work with, but doesn't act as good of a
> > > barrier to air and moisture as tyvek does.
> >
> >
> > Also 15# is a little thin, the stuff breaks down but I'm not sure 30 is
> > used on walls?
> >
> > If you use felt on a roof 30 is the way to go
> >
> > cheers
> > Bob
>
> Yes 30# is the way to go on walls. There are some experts out there
> who recommend felt over tyveck, since it is more breathable. (I still
> use Tyveck on new construction though. It costs more, but the labor
> savings over felt is considerable.) Also, there is some concern with
> Tyveck and cedar--the tannins in the cedar act as surfactants that
> break up the surface tension of water and allow water to pass through.
>
>
> I would ask your bidder how they plan to detail the windows and doors
> so as to prevent water intrusion. They should add some sort of z
> flashing over the head casing, which is tucked under the building
> paper. Details like that are more important than whether they use felt
> or tyveck.
Some building researchers suggest two layers of #15 felt to overcome
the tanin problem.
TB
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