Water damage to joist

[Hotwire]

One of the joists under my bathroom floor has been damaged by water leakage. When i first seen it it was wet after soggy chipboard sitting on it i let it dry out then a building firm came and said it was ok and painted some green stuff on it. I am now putting down a new plywood floor so the joist has been exposed again, i was doing work in the area with a chisel and a top layer of the joist was just flaking of. I seemed to get rid of this loose top layer which in parts could be around a 1/4inch deep and the damage is about a foot in length. Is there any treatment i can apply to the joist to stop any further deteriation and is the a suitable filler i can use to level the top of the joist after treatment. The joists are substantial things 7 1/2inch deep and this damaged joist has a second joist butted up to it and the two have the partition wall resting on them.

 

[bathjobby]

I wouldn't bother trying to fill the top to level it. I'd get a piece of new joist and fix it to the side of the existing one if that is possible. If you really want to level the existing one I would recommend cutting all the loose stuff out neatly and put a piece of packing wood in there.

 

[Hotwire]

Cheers for the input, somebody at the builders yard said this morning i would be better cutting the affected bit out so thats what i done. 3hr,s that chiselling took me, cos some of the joist is under a partition wall. I definetly wouldnt recommend it, especially when youve got a runny nose . I was gonna screw a piece of 4" x 2" down the side as the new floor didnt have much to sit on so now it will kill two birds with one stone. Im gonna use a bit of hardwood to fill the cut out. Ive also painted it with some chemical stuff i bought today. Hopefully that little lot will cure the problem.