Laying new deck on old joists

[Housemartin]

I will be laying a new deck on old hardwood joists, the joists are pretty sound and I recon there is between 6 and 10 years left in them. However, I don't want to contaminate the new deck in any way from any residual wet rot (even though I will be treating the joists) I was thinking about plastic DPM between the boards and joists but am wary of moisture being retained under the boards, does any one have any cheap alternative to this that would allow a small air gap?

[D.M.Chapman]

If the new boards are treated then it shouldn't be a problem surely? Strip old ones, give the joists a good dose of wood treatment and screw on the new boards. That's what I'd do anyway.

Adding DPM or something would make it worse IMO - trap the damp as you say.

Darren

[Housemartin]

On 26 Apr, 22:21, dmc@puffin. (D.M.Chapman) wrote

All the same just to be sure I think I may nail down some nylon rope on the joists.

Cheers

Martin

[george [dicegeorge]]

put slightly wider wood over the hardwood and under the decking, like old pallet wood, thatd slow the rot getting up and dry things a bit more ?