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Porch deck finishing choices Wayne Whitney 04-03-2007
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Posted by Wayne Whitney on April 3, 2007, 9:20 pm


Hello,

I'm replacing the deck of my covered, open porch. The new deck is 5/4
x 4 redwood v-notch T&G. [Obviously solid boards with a gap would
provide better drainage, but IMHO that is too informal for a covered
porch.] A couple questions on finishing:

1) I do want to finish the redwood, as otherwise it will tend to get a
bit grungy from foot traffic. My instinct is to use a penetrating
oil finish, rather than a film finish, because when a film finish
fails it will flake off and require sanding to remove it. I'm
leaning towards Penofin red label. Anything I'm missing here?

2) Is it useful to prefinish the underside before installation? What
about the tongue and groove? The porch deck is 3.5' - 4' above
open soil, with the region underneath enclosed but vented.

Thanks, Wayne


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Posted by Lawrence on April 3, 2007, 11:51 pm


> Hello,
>
> I'm replacing the deck of my covered, open porch. The new deck is 5/4
> x 4 redwood v-notch T&G. [Obviously solid boards with a gap would
> provide better drainage, but IMHO that is too informal for a covered
> porch.] A couple questions on finishing:
>
> 1) I do want to finish the redwood, as otherwise it will tend to get a
> bit grungy from foot traffic. My instinct is to use a penetrating
> oil finish, rather than a film finish, because when a film finish
> fails it will flake off and require sanding to remove it. I'm
> leaning towards Penofin red label. Anything I'm missing here?

Nope. If your preference is a penetrating finishes then thats fine.
It will not be as durable or cleanable as a polyeurathane but it is
indeed easier to apply and maintain. This is why poly is usually used
indoors and penetrating oils mostly for outdoor porches.
>
> 2) Is it useful to prefinish the underside before installation? What
> about the tongue and groove? The porch deck is 3.5' - 4' above
> open soil, with the region underneath enclosed but vented.

Woodworking tradition is that the underneath not have finish. Just
too much trouble and too little payoff. I have to say that it is
useful since it further protects the boards and will reduce and
expanding and contracting that occurs with all wood. Having said
that, almost no one would go what is a significant amount of trouble
to finish a surface that no one ever sees or uses.


Posted by 3G on April 4, 2007, 5:28 am



| > Hello,
| >
| > I'm replacing the deck of my covered, open porch. The new deck is
5/4
| > x 4 redwood v-notch T&G. [Obviously solid boards with a gap would
| > provide better drainage, but IMHO that is too informal for a covered
| > porch.] A couple questions on finishing:
| >
| > 1) I do want to finish the redwood, as otherwise it will tend to get
a
| > bit grungy from foot traffic. My instinct is to use a
penetrating
| > oil finish, rather than a film finish, because when a film finish
| > fails it will flake off and require sanding to remove it. I'm
| > leaning towards Penofin red label. Anything I'm missing here?


Cabot Australian Timber oil is what I prefer.


|
| Nope. If your preference is a penetrating finishes then thats fine.
| It will not be as durable or cleanable as a polyeurathane but it is
| indeed easier to apply and maintain. This is why poly is usually used
| indoors and penetrating oils mostly for outdoor porches.
| >
| > 2) Is it useful to prefinish the underside before installation?
What
| > about the tongue and groove? The porch deck is 3.5' - 4' above
| > open soil, with the region underneath enclosed but vented.
|
| Woodworking tradition is that the underneath not have finish. Just
| too much trouble and too little payoff. I have to say that it is
| useful since it further protects the boards and will reduce and
| expanding and contracting that occurs with all wood. Having said
| that, almost no one would go what is a significant amount of trouble
| to finish a surface that no one ever sees or uses.
|



Posted by Wayne Whitney on April 4, 2007, 11:32 am



> > 2) Is it useful to prefinish the underside before installation? What
> > about the tongue and groove? The porch deck is 3.5' - 4' above
> > open soil, with the region underneath enclosed but vented.
>
> Woodworking tradition is that the underneath not have finish. Just
> too much trouble and too little payoff. I have to say that it is
> useful since it further protects the boards and will reduce and
> expanding and contracting that occurs with all wood. Having said
> that, almost no one would go what is a significant amount of trouble
> to finish a surface that no one ever sees or uses.

Well, it's no more trouble than backpriming siding. Would it be silly
to finish the back face without finishing the tongue and groove?
Seems like it would still equalize water vapor absorption rates
between faces to reduce cupping.

Cheers, Wayne


Posted by Lawrence on April 4, 2007, 2:11 pm


>
> > > 2) Is it useful to prefinish the underside before installation? What
> > > about the tongue and groove? The porch deck is 3.5' - 4' above
> > > open soil, with the region underneath enclosed but vented.
>
> > Woodworking tradition is that the underneath not have finish. Just
> > too much trouble and too little payoff. I have to say that it is
> > useful since it further protects the boards and will reduce and
> > expanding and contracting that occurs with all wood. Having said
> > that, almost no one would go what is a significant amount of trouble
> > to finish a surface that no one ever sees or uses.
>
> Well, it's no more trouble than backpriming siding. Would it be silly
> to finish the back face without finishing the tongue and groove?
> Seems like it would still equalize water vapor absorption rates
> between faces to reduce cupping.
>
> Cheers, Wayne

The job is yours.


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