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Anonymous
Posted on Monday, May 10, 2004 - 11:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Joe,
Do you have any informaiton on the properties of Slate roofing. I am looking for reistance values, absortivity, emissivity, permeance,
moisture storage, rain abxorptin factor etc. I am an HVAC engineer and would like to obtain this information for a current project.
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admin
Posted on Monday, May 10, 2004 - 09:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

Try directing your query to Jeff Levine at jefflevine@slateassociation.org

Joe
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Anonymous
Posted on Wednesday, September 21, 2005 - 06:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

what is the molecular formula of slate
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admin
Posted on Thursday, September 22, 2005 - 01:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

It varies depending on the source. Here's a chart from the Slate Roof Bible, 2nd edition, cut and pasted, so the formatting is screwed up, but you can figure it out. There are 4 columns, one under each state, listing percentages of the minerals shown at left. Some of the entries under the Virginia column (FeO, K2O and NA2O) are blank:

Mineral % Vermont NY PA VA
Quartz 59-68 56-68 55-65 54-62
Al2O3 14-19 10-13 15-22 17-25
Fe2O3 0.8-5.2 1.5-5.6 1.4-4.5 7.0-7.
FeO 2.5-6.8 1.2-3.8 2.3-9.0
CaO 0.3-2.2 0.1-5.1 0.2-4.2 0.4-1.9
MgO 2.2-3.4 3.2-6.4 1.5-3.8 1.5-3.9
K2O 3.5-5.5 2.8-4.4 1.1-3.7
Na2O 1.1-1.9 0.2-0.8 0.5-3.5
CO2 0.1-3.0 0-7.4 1.6-3.7 0.2-2.0
US Dept. of Commerce, Bureau of Standards, Journal of Research, V9, No.3, 9/32

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