There seems to be some, but not a lot of ipe data already on this
newsgroup. I'm preparing to have a ~500 ft^2 deck replaced using 1x6
ipe (the old deck was 2x6 cedar). Because there is almost no local
experience using ipe I've had to spec out everything myself to decking
contractors. I think I have most of the topics covered (anchorseal, ss
fasteners, carbide teeth on saws). I'd really appreciate if anyone
could provide their suggestions on:

1.DRILLING: What is the optimal drill type for drilling & counterboring
for 3/8" plugs? My current ideas a
a. drilling two separate holes: 3/8" carbide forstner bit for the plugs
and 3/16" carbide brad tipped for the screws or
b. HSS drill bit/countersink/counter bore kit from Lee Valley
Any recommendations on material/drill type/ease of sharpening?

2. My existing deck is 25 years old. The framing is 2x10 treated @ 16"
centers and upon inspection it looks very sound- no rot/soft spots.
I'm not sure how to evaluate how many years may be left in it. Of
course, I don't want to put a 40 year deck on a frame with 10-15 years
left on it. Does anyone have real experience with life expectancy of
1980 treated lumber vs. today's treated lumber? These joists look a
lot straighter than what I've seen lately at Home Depot. Cost to
reframe is ~$2500 using 2x8's.

Any and all advice from experienced ipe users is welcomed!
Thank you.