Morgans wrote:
wrote

for a 3/8" gap I'd just use some "Durabond 90" with tape to fill the area
and forget about the small blocks of drywall.

I second that.




Ah, that Durabond 90 seems to be good stuff! sigh...

I've used it as a "prefill" in gaps that are as wide as 1/2", in many
cases shaving the side of the drywall at a slight angle to encourage the
compound to stay put forever.

The main question I have now concerns whether using Durabond as a
prefill has given me sufficient strength. I'm trying to decide whether
to tape with Durabond on top of my prefill, or to tape with an alternate
(more sandable) setting compound. Are there some rules of thumb I can
use to help me decide?

The most critical locations are probably those around some of my
electrical boxes. I assume to use up to 4 pieces of tape bounding the
box, overlapped at the corners. Would you consider using 4 pieces
anyway, for symmetry, even if you only filled one to three sides?

I'm pleased to report that having most of the joints taped, my drywall
is starting to look like "real walls"! I'll post pictures soon so you
can see what you made--I certainly regard this project as a
collaboration with everyone who has helped me so much in this thread.
It's been a real trip.

Bill