Forgot to say....I don't use a gun...just a hammer. If you start with a clearance hole through the tongue and into the plan, it's ok... but you need to concentrate.....always get a few black nails/bent nails at about 7 at night!
Yes, they are those B*****d oval things! I always pre-drill....especially into hardwood, a clearance hole through the tongue does the trick, you don't need anything through the chipboard, etc. A supplier suggested this as the best method when I first started...done about 110 sq metres now.
I've laid SWFs onto all sorts of sufaces and have found the best way to do it is to blind fix with oval brads at an angle through the tongue; I use a nail punch to punch the head of the brad below the surface. Nail it at an angle and it won't pull out.
I've done this on chip board...
Just found a damp patch under my oak floor; it's all suspended timber but this particular corner has a concrete section going under the wall. I believe this area used to be a floor-length sash or a doorway to the outside.
Could it be rising damp? I don't think it's wet enough for a burst...