On Apr 30, 10:35 am, "EXT" wrote:
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.

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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?