[RE-wrenches] crumbling ballast blocks

[Kirk Herander]

Thanks. FYI - I’ve since found this on the Ironridge site: http://files.ironridge.com/ballastedmounting/IronRidge_BallastedRoofMount_ballastSupplierList.pdf
Recommendation is 3000 psi min,
And be freeze/thaw resistant. 

Kirk Herander


> On Jun 30, 2018, at 10:10 AM, "glenn.burt at glbcc.com" <glenn.burt at glbcc.com> wrote:
> 
> I inspected a number of school rooftop systems for the state of NY about 6 years ago. Many had ballast blocks that were little more than dirt piles.
> Most blocks that you can pick up at big box stores are inadequate for this duty, and Sunpower recognized this about 10 years ago when they published a specification for blocks used with their systems.
> I'd have to dig through my archives to locate it, and am on my phone now, so dont have it handy, but seem to remember a high psi mix being required.
> 
> So yes, I have seen it before, and have insured any system we installed used blocks with a similar standard. We rarely do that kind of job anymore, so dont have the info quick at hand.
> 
> Glenn
> 
> Sent from my 'smart' phone so please excuse spelling and typos.
> 
> ------ Original message------
> From: Kirk Herander
> Date: Sat, Jun 30, 2018 9:10 AM
> To: re-wrenches at lists.re-wrenches.org;
> Cc:
> Subject:[RE-wrenches] crumbling ballast blocks
> 
> 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
> 
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