Back to the original post. A commercial system doesn't mean they used
paving blocks. I have seen many that did not. Fly ash is also a product
of coal combustion that can be used to make a stronger concrete, though
it won't necessarily help in this case, as it is lighter.
On 6/30/2018 7:05 PM, Ken Schaal wrote:
Regular cement blocks absorb water, freeze thaw cycle destroys them.
Paving blocks are made with silica fume, denser than cement,dont
absorb water, don't suffer freeze thaw damage. They are designed for
walkways and driveways.
There are cement looking pavers , 12x12 x 2" ,also made with fume.
Any block plant should be able to make balast blocks to the needed
specs. Silica fume is a waste product of coal combustion
..ie cheap, but effective.
Ken schaal
On Jun 30, 2018 6:29 PM, "cwarfel" <cwar...@entech-engineering.com
<mailto:cwar...@entech-engineering.com>> wrote:
I am pretty sure it is the freeze-thaw cycle that the blocks are
exposed to. I have inspected hundreds of system in the Northeast
and this is a recurringproblem. It has to be part of the
maintenance protocols or there will be insufficient weight to
resist thewind uplift forces. Chris
On 6/30/2018 6:17 PM, Chris Schaefer wrote:
Kirk,
Had the same thing happen to me on a commercial ballasted system
installed back in 2004. Had to be moved around to allow
installation of a new roof system. Replaced all the ballast in
2017. I'm located in Western NY, thus the same weather you see.
The blocks were on a stainless steel pan of which the array was
attached to. I've plenty of ideas as to why they broke down but
no real evidence. I expect it to happen again. Does make me
wonder about the new ballast systems that still call out for the
blocks as ballast. Perhaps poly sand bags?
Christopher
On Wed, Jun 27, 2018 at 4:20 PM, Kirk Herander
<vtso...@icloud.com <mailto:vtso...@icloud.com>> wrote:
All,
I have a 6 year old ballasted roof system in which about 50%
of the solid cap blocks(16”L x 8”w x 4”D) are cracked and
crumbing, some are close to rubble. I assume it was a bad
batch, but has anyone seen this before? What might be the
preventive remedy in the future? A coating of some sort?
*Kirk Herander*
*Owner|Principal, VT Solar, LLC *
*/Celebrating our 27^th Anniversary 1991-2018/*
*www.vermontsolarnow.com <http://www.vermontsolarnow.com>*
dba Vermont Solar Engineering
NABCEP^TM 2003 Inaugural Certificant
VT RE Incentive Program Partner
802.863.1202
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