Why not just add some vertical lumber screwed to the outside of the form
to raise the base-supporting lumber high enough to trowel underneath
it? The tower base extends 16 inches above the finished concrete so I
don't see the problem. If you need more clearance than could be had
with wood for the horizontal portion that holds the tower base, use some
steel angle stock ... such as this:
https://www.lowes.com/pd/Hillman-1-1-2-in-W-x-1-1-2-in-H-x-6-ft-L-Zinc-Plated-Steel-Perforated-Slotted-Angle/3059263
73,
Dave AB7E
On 11/12/2019 12:55 PM, Art Greenberg wrote:
I'm putting up a tower soon, and I have questions about working with concrete.
The tower will the a Tashjian WT-51.
The hole is 2.5ft x 2.5ft, 5.5ft deep and the concrete extends 6 inches above
grade for a total foundation height of 6ft. The instructions for the tower base
call for it to be suspended in the hole while the concrete is poured. The
instructions show a form around the top of the hole and additional lumber is
used to suspend the base, sitting on top of the form. The concrete is to be
poured to level with the top of the form, which means its just touching the
underside of the lumber used to suspend the base. So the presence of the lumber
suspending the base in the hole will be in the way of fully finishing the top
of the concrete.
(a) How long do I have before the top surface of the pour cures too much to
permit fully working the finish?
(b) How long should I allow the concrete to cure before I remove the lumber
suspending the tower base?
Thanks.
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