Ralph-
When I was still in NJ, we replaced the shake roof on the c. 1740 
building that I worked in. I consulted with a bunch of very 
knowledgable roofers at the time. Our roof was 20 years old, and 
failing. A number of the roofers said that you could expect a shake 
roof to last for 50 years with decent maintenance-- ours failed so 
quickly because they had only installed about 1/2 the number of shingle 
per square foot than should have been installed. A cautionary tale 
indeed.

In any case... the roofing brain trust that I consulted gave pretty 
much the same advice that Ken did for moss growth: Use a solution of 
what was essentially Round-up or bleach to kill the growth, and wash 
with water. May need to repeat for maintenanceif the moss is heavy, but 
probably worth it since the roof could potentially have another 25 
years of life-span.

my .02

-Heidi


-----Original Message-----
From: RLWALTR <[log in to unmask]>
To: BULLAMANKA-PINHEADS <[log in to unmask]>
Sent: Thu, Jun 9, 2011 4:22 pm
Subject: [BP] New tread/old threads


I have a marginally legitimate question again. 
 
 Our local historical society's HQ is in a 1740s farm house with a sawn 
cedar shake roof, which as I remember is about 23 years old (I used to 
be on the board, but haven't been in decades).  I am told by a friend 
now on the board that they are thinking about power washing the roof to 
get rid of whatever growies are growing in it, which makes me uneasy.
 
 What is the current state of the art Histo Presto thinking on 
maintenance of such a roof, and am I correct in worrying that pressure 
washing will drive moisture further into the shakes?  Are there 
chemicals they should use or avoid in power washing?
 
Thanks,
Ralph (9 days prostate-free)

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