On Jun 22, 11:32*am, mg wrote:
There are 6 or 8 spiral nails on our deck that will not stay down. The
boards are flat on the deck and do not appear to be cupped or warped.
But, within about 3 months of driving the nails down, they are back
up.

Should I pull the nails and replace them with the next size larger
spiral nail?

Should I pull the nails and replace them with coated deck screws?

Deck screws hold the best, but it's your call about whether the
different fastener heads would look objectionable or not. As an
alternative you could take out the offending nails, coat a couple of
toothpicks with exterior wood glue and insert them into the hole
before hammering the nail back into place.

R