Mahogany is a terrific outdoor wood for trim as well as decking. You can
use the 5/4 x 6 decking and mill the trim pieces from it. It takes paint as
well as natural finishes such as spar varnish over BLO.
Fiber cement? ;-)
I'm re-siding my house with fiber cement siding and am using fiber cement
trim too. I wouldn't run it through my DJ-20 or Cabinet saw but it seems
like great exterior trim material... no rot, no bugs, holds paint like a
sponge. I've been cutting the trim with a diamond blade in an angle grinder
and with a 3.5" carbide blade in a cordless tile saw--PC shears for the
Another good point is that fiber cement siding and trim is considerably less
expensive than the vertical grain western red cedar and clear pine trim that
is/was on the house. I needed a considerable amount of material to replace
damaged material and deal with remodeling driven changes and the fiber
cement offered a very price competitive alternative.
Call me a heretic but as far as I'm concerned, the best wood for outdoor
trim is solid plastic, not wood. Had a problem with some of the brick
molding on the garage. It was sucking up water that splashed on the
sidewalk outside the access door and the overhead door.
While looking for replacement stock at Lowes, I found that they make all
sorts of outdoor wood trim out of solid vinyl. Color runs all the way
through it and it machines and goes up just like its wood counterpart. Only
difference is that I will no longer be painting it or replacing it<g> If
your trim needs replacement, give this stuff serious consideration.
I've tried african mahogany and spanish cedar to replace porch rails,
and I'd vote for the mahogany. The mahogany works better - the cedar
can be a little too soft and easy to damage. The cedar dust can be
pretty irritating also. I've been getting 6/4 mahogany, 10 ft stock for
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