On Oct 19, 9:18*pm, DD_BobK wrote:
On Oct 19, 7:25*pm, Red Green wrote:



RicodJour wrote :

On Oct 18, 11:47*am, wrote:
I am putting up some trim on shed project. this is 1x4 cedar. just
wonder
ing
if regular hot-dip galvanized nails ok for this purpose?

Not really. *Unless you're painting the cedar, and why would you go
with cedar in that instance?

Eventually the tannins in the cedar will eat through the zinc coating
and you'll get nasty black splotches at every nail that is exposed to
the weather. *Even countersinking the nails and puttying the heads
won't stop it. *There's always moisture in wood and you'll get the
black stains.

Stainless is a fairly cheap upgrade, so if you want it to look good
for a long time, spring for the extra few bucks.

R

Didn't know that about galv nails and cedar. Can you think of other
lumber that shouldn't have galv nails?
Can you think of other *lumber that shouldn't have galv nails?

redwood and pretty much any exterior painted wood

cheers
Bob

oops! I meant any exterior painted or unpainted wood

The fastener will eventually rust & either stain the wood or the
streak the paint.

Even "good" heavy hot dipped galvanized will be a problem, driving the
nails damage the coating.

SS will out last the wood....why allow the desire to save $50 destroy
$1000's worth of wood

I believe the issue is that rust is hygroscopic,

moisture in the wood / air encourages rust, once the rust forms, it
attracts more moisture resulting in rot (and wood that is more prone
to moisture retention)

which in turn encourages more rust........the process continues until
the fastener is consumed and the wood ruined.

I discovered this problem when I started redwood sill repair 20+ years
ago.
SS nails & screws I installed in 1987 are still in "like new"
condition in south facing redwood window sills.

cheers
Bob