Replies

1. 
   Gerard_De_Lany | Jun 11, 2001 05:20pm | #1

   *
   Is that concrete slab going to be poured up against an existing wooden wall? If so, I'd say don't.
   Gerard

1. 
   calvin_ | Jun 12, 2001 04:53am | #2

   *I was going to push for never, but I bet there might be a way to water/vermin proof the wood structure. Just haven't come across it yet. Best of luck.

1. 
   Bob_Walker | Jun 12, 2001 01:32pm | #3

   *I'm with calvin's first instinct: never.Consider the life expectancy of any vermin/water proofing.

1. 
   Luka_ | Jun 12, 2001 05:48pm | #4

   *What's the possibility of replacing at least part of that wood wall with something else ?

1. 
   Terry_Holloway | Jun 13, 2001 11:02am | #5

   *A concrete slab can certainly be placed against your old structure especially if you have no other options. First pretreat the area for termites. If the slab will have fill, dirt and/or gravel, directly against wood you can use a thick 45-60 mil rubber membrane (used mostly for flat roofs on commercial buildings) or pond liner. Modern poly/plastic sheeting is made to break down and won't last.

2. 
   Pete_Draganic | Jun 14, 2001 05:30am | #6

   *Terry,I respectfully disagree with that advice. You will still create a habitat for vermin and moisture regardless of the seal/barrier between wood and concrete. The coolness of the concrete will invite condensation to the wood side of the membrane therefor providing a moist habitat ofr lots of nasty things you don't want.I say find a better way. Perhaps lower the slab enough to avoid wood contact. It would help if there were more info and perhaps a snapshot.Pete

3. 
   Terry_Holloway | Jun 15, 2001 01:37pm | #7

   *Pete,I agree that concrete, given a choice, should not be used against wood. You are dead on regarding what might happen behind the membrane. I was merely replying to Donald's description that concrete would be best. If this is the only option, yes photos would help, than lets try to the best of it.If Donald is locked into this scenario, would p/t or marine plywood placed over or replacing the wood be an option, assuming (I know the saying) the wood he means, is siding or sheathing.

2. 
   DONALD_THORNTON | Jun 15, 2001 01:37pm | #8

   *
   I am building an addition onto my house,due to the grade I would be
   best off to pour a concrete slab but I am worried about pouring
   concrete against an existing wall.I am worried about the concrete
   pulling away over time and creating a gap between the addition and
   the existing house and I am also afraid termites will make a home
   between the wall and concrete.Do any of you guys have any suggestions
   or recommendations as to my concerns? P.S. The addition will have
   plumbing in it..