[Greenbuilding] : EPDM roof coating

[nick pine]

Clarke Olsen <colsen at fairpoint.net> writes:

> Does anyone have a reflective coating for EPDM roofing to recommend?

Greenhouse whitewash could be sprayed on in June and washed off in September 
or rained off in November...

http://www.greenhousemegastore.com/product/lite-stick-shading-compound/shade-paint 
says

Lite Stick formulation is designed for seasonal shading and is normally 
removed by moderate rains. 100% removal is easy with a light brushing. 5 
Gallon Pail. [$169, ie 1.2 cent/ft^2, after a 15:1 dilution.]

Applications Guidelines

FOR EXTERIOR USE. KOOL RAY can be used over most types of greenhouse 
exteriors. It can be applied by brush, roller or spray. Spray application is 
generally the most efficient method of applying KOOL RAY and will usually 
result in a more uniform shade density and more even wear. Spray tip sizes 
of .03, .04, .06, .08 and angles of 65 - 85 work well. Consult your supplier 
of spray equipment for their specific recommendations.

Dilution Ratios

KOOL RAY is a super concentrated formula designed to be diluted with water. 
Standard dilution rate is 1 part KOOL RAY to 15 parts water which will 
provide approximately 73% shading. Ratios and shading effect can be adjusted 
according to the grower's particular needs. For a denser shade, several 
lighter, more diluted coats are recommended over a single, less diluted, 
heavy coat. A heavy coat can tend to cause "mud cracking" which can lead to 
eventual flaking and less even wear.

Coverage

Coverage will vary according to method of application, applicator, and 
dilution ratio. Spray will normally provide best coverage of approximately 
175 sq. ft. per gallon after dilution. For instance, a 1:15 dilution of 1 
gallon of KOOL RAY ULTRA to 15 gallons of water yields a total of 16 gallons 
of liquid shade. A 1:10 dilution yields a total of 11 gallons of shade. To 
determine coverage, multiply the diluted gallon amount by 175. Example - 
1:15 = 16 gallons x 175 = 2800 sq. ft. 1:10 = 11 gallons x 175 = 1925 sq. 
ft. Higher dilution rations (less concentrated) result in a lighter shade, 
lower dilution ratios result in a darker shade.

Nick