Hey all Im hanging ledger board with icfvl and icfcw but the engineered floor specs 1 1/8 rimboard as 1st joist use the icf cw and shim or conventional anchors? What do you all do / recommend Thankx Peter

Think I would go with ab's. Any shims would loosen over time.

I don't believe you can use "rimboard" as a ledger!! The Simpson ICF hangars require a LVL ledger.

A rimboard is made typically for compression; it appears someone missed the fact that you are hanging inside the foundation.

I would verify this BEFORE installing it!

Thanks Jim, The ledger is LVL its just the first or outside joists that are rimboard It's being spec'd by an engineer so I hope he is right in recommending / authorizing the rimboard use!! Cheers Peter

I 'm not sure why he(?) would spec a rimboard as a first joist when you can install an I-joist in a selected joist hangar? I have never seen a rimboard used as a joist, in fact I have never seen any mfg provide that info, although I did see somewhere where a rimbord handled a stair opening. I sometimes spaced an I-joist 1 1/2" off the wall so the joist hangar had full mounting whether a face nailed or top mount. I sometimes would nail on a 2x to the top flange but I always felt the 3/4" floor sheathing covered the gap at the wall.

Is this rimjoist spec'd to be screwed to the ICF studs/embedments?

Jim:
Ive only received a preliminary drawing and the connection method isnt spec'd

The joists are 19 3/8 " OC , I wonder if screwing to the imbedded fastening strips would be sufficient?
Perhaps if a section of 1/2 ply was imbedded in the foam first?
Peter

Posted By peterswet on 17 Oct 2010 09:46 PM
Jim:
Ive only received a preliminary drawing and the connection method isnt spec'd

The joists are 19 3/8 " OC , I wonder if screwing to the imbedded fastening strips would be sufficient?
Perhaps if a section of 1/2 ply was imbedded in the foam first?
Peter

Are you going to have any ceramic tile or stone on the floor? If so, consider asking your engr to go to 16" spacing. I built my ICF house using 9 1/4" by 2 3/8" I-joists spaced 16" oc and Advantech 3/4" subflooring. My greatest spans under tile are only about 12' or so and the floor is rock solid. One of the building suppliers I talked to while getting preliminary cost info said the 9 1/4" I-joists are such a high volume commodity item they were by far the least expensive ones to use, inexpensive enough to easily justify 16" spacing. I used 12" spacing under the Jacuzzi and showers for added rigidity. Just like Jim, I just put one of the joists as close as possible to the end wall. Plenty rigid without going through the hassle of fastening to the end wall. 1" to 2" of subfloor overhanging the end joist is no cause for concern. Actually, I used 7" LVLs under the showers to give me depth to pour a mortar base and be even with the bathroom floor. I have curbless showers.

If you go to johnbridge.com, a tile contractor and DIY forum, you will find heavy emphasis on making sure the floor is rigid. At 19 3/8" spacing you'll need to go to a thicker subfloor to keep deflection to a minimum. You want to be sure to pass the 'china closet test', i.e. have the floor rigid enough that you can jump on it and not hear the dishes in the china closet rattle!