Laying new deck on old joists


H

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?
 
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D

D.M.Chapman

Housemartin said:
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?
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
 
H

Housemartin

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

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

Cheers

Martin
 
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G

george [dicegeorge]

D.M.Chapman said:
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
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
?
 

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