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New Deck over Old Deck? powersds 04-30-2007
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Posted by on April 30, 2007, 10:18 am


I just purchased a home with a deck. The previous owner built a new
screen room on top of the 20 year old deck without doing anything to
renew the deck. I have tried pressure washing it but the boards are
in poor shape. Turning or replacing the deck boards is not an option
without dis-assembling the entire screen room. Can I purchase 5/4x6
PT boards and just install them on top of the old deck? If so, how
long would I have to wait before I could stain them considering they
are shaded by roof of the screen room?


Radiant Heat 468x60
Posted by EXT on April 30, 2007, 10:35 am


If it is just a screened in room that means that water can blow in onto the
floor boards. If the new boards are nailed down directly onto the old ones,
water will be able to penetrate between the boards and stay there to
encourage warping and worse mould, mildew and rot.

If you have enough height clearance at doorways, you possibly could rip some
strips of pressure treated or weather resistant wood about 1/2", 3/4" or 1"
thick, and nail it down over the old floor right over the joists under the
old floor. This will provide an air space to prevent water from being
trapped. Your new floor could be laid over the strips nailing or screwing
through to the old floor.

If you do not have the height to build up the floor properly, you may have
to saw around the walls to remove the old boards and replace them with new
ones. It may take some creative solution to cover up the remnants of the old
floor at the walls where the saw cannot cut very close to the walls.

>I just purchased a home with a deck. The previous owner built a new
> screen room on top of the 20 year old deck without doing anything to
> renew the deck. I have tried pressure washing it but the boards are
> in poor shape. Turning or replacing the deck boards is not an option
> without dis-assembling the entire screen room. Can I purchase 5/4x6
> PT boards and just install them on top of the old deck? If so, how
> long would I have to wait before I could stain them considering they
> are shaded by roof of the screen room?
>



Posted by powerman on April 30, 2007, 10:53 am


> If it is just a screened in room that means that water can blow in onto the
> floor boards. If the new boards are nailed down directly onto the old ones,
> water will be able to penetrate between the boards and stay there to
> encourage warping and worse mould, mildew and rot.
>
> If you have enough height clearance at doorways, you possibly could rip some
> strips of pressure treated or weather resistant wood about 1/2", 3/4" or 1"
> thick, and nail it down over the old floor right over the joists under the
> old floor. This will provide an air space to prevent water from being
> trapped. Your new floor could be laid over the strips nailing or screwing
> through to the old floor.
>
> If you do not have the height to build up the floor properly, you may have
> to saw around the walls to remove the old boards and replace them with new
> ones. It may take some creative solution to cover up the remnants of the old
> floor at the walls where the saw cannot cut very close to the walls.
>
>
>
>
>
> >I just purchased a home with a deck. The previous owner built a new
> > screen room on top of the 20 year old deck without doing anything to
> > renew the deck. I have tried pressure washing it but the boards are
> > in poor shape. Turning or replacing the deck boards is not an option
> > without dis-assembling the entire screen room. Can I purchase 5/4x6
> > PT boards and just install them on top of the old deck? If so, how
> > long would I have to wait before I could stain them considering they
> > are shaded by roof of the screen room?- Hide quoted text -
>
> - Show quoted text -


Yes, water can still blow in onto the boards. I do have enough room
under the threshhold of the french door to build up the deck. Would
the existing gap between boards provide enough ventilation for drying?


Posted by EXT on April 30, 2007, 11:05 am


Not with nailing new boards in contact with the old. Sure fire recipe for
mould and decay. If you space the boards away from the old ones as I
described you would have a space to allow the wood to dry out, but it still
could be a problem with dust, dirt and insects filling in the space with
moisture holding debris.

>> If it is just a screened in room that means that water can blow in onto
>> the
>> floor boards. If the new boards are nailed down directly onto the old
>> ones,
>> water will be able to penetrate between the boards and stay there to
>> encourage warping and worse mould, mildew and rot.
>>
>> If you have enough height clearance at doorways, you possibly could rip
>> some
>> strips of pressure treated or weather resistant wood about 1/2", 3/4" or
>> 1"
>> thick, and nail it down over the old floor right over the joists under
>> the
>> old floor. This will provide an air space to prevent water from being
>> trapped. Your new floor could be laid over the strips nailing or screwing
>> through to the old floor.
>>
>> If you do not have the height to build up the floor properly, you may
>> have
>> to saw around the walls to remove the old boards and replace them with
>> new
>> ones. It may take some creative solution to cover up the remnants of the
>> old
>> floor at the walls where the saw cannot cut very close to the walls.
>>
>>
>>
>>
>>
>> >I just purchased a home with a deck. The previous owner built a new
>> > screen room on top of the 20 year old deck without doing anything to
>> > renew the deck. I have tried pressure washing it but the boards are
>> > in poor shape. Turning or replacing the deck boards is not an option
>> > without dis-assembling the entire screen room. Can I purchase 5/4x6
>> > PT boards and just install them on top of the old deck? If so, how
>> > long would I have to wait before I could stain them considering they
>> > are shaded by roof of the screen room?- Hide quoted text -
>>
>> - Show quoted text -
>
>
> Yes, water can still blow in onto the boards. I do have enough room
> under the threshhold of the french door to build up the deck. Would
> the existing gap between boards provide enough ventilation for drying?
>



Posted by John Gilmer on April 30, 2007, 2:53 pm



> I just purchased a home with a deck. The previous owner built a new
> screen room on top of the 20 year old deck without doing anything to
> renew the deck. I have tried pressure washing it but the boards are
> in poor shape. Turning or replacing the deck boards is not an option
> without dis-assembling the entire screen room. Can I purchase 5/4x6
> PT boards and just install them on top of the old deck? If so, how
> long would I have to wait before I could stain them considering they
> are shaded by roof of the screen room?

Get yourself a HEPA face mask and and sander and refinish your "floor."

It will look BETTER than a new deck when you are finished.

>



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