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, "[email protected]" <[email protected]> > 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: [email protected]; > 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 > > Celebrating our 27th Anniversary 1991-2018 > > www.vermontsolarnow.com > > dba Vermont Solar Engineering > > NABCEPTM 2003 Inaugural Certificant > > VT RE Incentive Program Partner > > 802.863.1202 > > > > > > >
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