Isolating rim joist from poured concrete
oldlou
| Posted in Construction Techniques on
I am adding an addition, built on a slab, to the side of a house built with a crawl space. The owner wants a level floor between the two spaces so the slab will be poured up to the top of the rim joists. I do not want the concrete to contact the rim because I fear that the rim will be rotted out by the lime in the concrete.
Is my fear unwarranted? What can I use isolate the two? My concrete man first wanted to use aluminum, but I nixed that, now he wants to use black board expansion joint material. Is this a good choice?
I wanted to use copper but the crete man thinks that too spendy for his fixed price. I concur, and am willing to make a satisfactory compromise.
Replies
Try Ice Shield on the rim, should provide the protection you are looking for, at a relatively low cost. How are you planning on controling movement between the two different foundations?
Brudoggie
Could not come up with a foolproof method that would not possibly adversely affect the main house, a very expensive log house. The point of connection is a 57" wide hallway between the two buildings. At the start of this hallway the flooring will change from hickory hardwood, the real deal, to carpeting. We are hoping that this transition line will disguise any small differential movement.
What do you think of our plan? Do I have my head in the sand AGAIN. argh.
I used concrete board nailed to the rim joist then poured the concrete up to it.
ANDYSZ2