[TowerTalk] Grout

[Lonberg, Hank]

Our standard specs for grouting call for Five Star Grout and nobody seems to
have a problem finding it. 

Grout does nothing to decrease the baseplate thickness or reduce the number
of anchor bolts. These are determined by the loads in the system and the
allowable loads that anchor bolts or steel plate can carry. What the grout
does is allow a system to be set at a precise elevation and plumb tolerance
using some leveling mechanism, shims or leveling nuts. The normal tolerance
to concrete placement is plus/minus 1/8 inch. The grout fills the space
between the formed and placed concrete and the underside of the base-plate
to transfer the load into the foundation, it is an extension of the concrete
to the underside of the plate and allow for uniform bearing by filling in
all the irregularities that may be present.

When you grout the base plate be sure to completely fill the space and
vibrate or bang the top of the plate so there are no voids under the
base-plate, and use a non-metallic non-shrink grout, metallic grouts tend to
discolor due to weathering if outdoors.

Hank Lonberg P.E. / KR7X


	-----Original Message-----
	From:	Tower2sell@aol.com [SMTP:Tower2sell@aol.com]
	Sent:	Friday, July 14, 2000 5:28 AM
	To:	k0myw@worldnet.att.net; towertalk@contesting.com
	Subject:	Re: [TowerTalk] Grout


	Grout under a base plate allows for fewer anchorbolts and thinner
baseplates. Non-shrink, non-metalic grout with about 5000 psi compressive
strength or more is good. 

	 FIVE STAR FLUID GROUT 100 is a commonly specified grout but may not
be widely available. They have a web site with various types of grouts.
Normally a concrete supply company will carry this commercial grade grout.
Look for an equal.

	Tower2sell@aol.com 

	In a message dated Fri, 14 Jul 2000  8:08:32 AM Eastern Daylight
Time, "Mike O'Brien" <k0myw@worldnet.att.net> writes:

	<< 
	Please pardon my ignorance, but what exactly is the purpose of
packing
	grout between a tower baseplate and the top of the concrete pad? I
know
	that U.S. Tower, for instance, specifies it, but offers no
explanation
	nor directions...

	    73, Mike, k0myw


	K7LXC@aol.com wrote:
	> 
	> In a message dated 12-07-00 4.23.31 Greenwich Standard Time,
kn9t@webtv.net
	> writes:
	> 
	> >  Need some info on type of grout to use
	> >  under legs and around amchor bolts of free standing towers. Can
this be
	> >  purchased at the local home builders stores ?
	> 
	>     Look in the yellow pages under Masonry Supplies or a building
materials
	> supplier. You're looking for non-shrink grout.
	> 
	>     I've also used the Home Depot type but it discolored after a
year or two.
	> Works okay but looks pretty grungy.
	> 
	> Cheers,   Steve    K7LXC
	> Tower Tech
	> 
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	 >>



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