Your favorite cool roof

Hey guys, let's take a break from all the hard work and busy topics and have a tad bit of fun here online

Post your favorite picture of a "Cool Roof"

Let's see what you have! B)

Roofguy Said:

Go Tropical Said:

Roofguy Said: Hey Tropical, question for ya: For years Ive noticed that whites (elastomerics, etc) seem to discolor with dirt and grunge faster than aluminum does, particularly aluminized emulsion. Is this because whites are tacky and/or because aluminum emulsion is slicker?

I know this is the case while its still in the hose of a pump. Whites and cutbacks are sticky and it takes a lot of psi to get them to spray - typically 1300-2000 psi. Whereas emulsion is very slick and will spray at just 350-425 psi.

This is also anecdotally verified on the roof - if you ever step in wet emulsion with any pitch to the roof and youll find out its slickern glass.

White elastomeric products may appear to have more dirt pick up than a aluminum product. However, its a matter of reflective properties and a good maintenance program in place to keep a white elastomeric coating or a aluminum coating at its peak performance will help.

When products are sprayable the amount of psi to spray the product is a function of viscosity, solids and liquid vehicle of any product. Usually asphalt emulsions are lower in solids which less psis will needed to pump the product.

Yeah that makes sense. My guess is that the natural sliminess of Bentonite Clay when wet adds to the slickeriness as well.

So there we were in Borger, Tx, circa 1985, roofing a Chevy dealership with a barrel top roof. I was the wandman and had sprayed out a 13 wide pattern of cutback mastic on the roof from the bottom where there was a 3 parapet, up about 20 up the slope. My brother Larry began rolling out the 126 roll of Trevira spun-bonded needle-punched 1215 polyester...from the bottom. You could walk in the wet cutback but the traction was tenuous on a steep barrel top. Everything was fine until he lifted up the roll from the center to give it a slight tug to pull out wrinkles...his feet slipped out from under him and he slid, under the 126 wide polyester fabric, tunnelling like a mole, until he came to a stop at the parapet. Man, he was a mess.

Obviously starting at the top woulda been a better plan.

:lol:

Exactly

Love the story!

Roofguy Said: Hey Tropical, question for ya: For years Ive noticed that whites (elastomerics, etc) seem to discolor with dirt and grunge faster than aluminum does, particularly aluminized emulsion. Is this because whites are tacky and/or because aluminum emulsion is slicker?

I know this is the case while its still in the hose of a pump. Whites and cutbacks are sticky and it takes a lot of psi to get them to spray - typically 1300-2000 psi. Whereas emulsion is very slick and will spray at just 350-425 psi.

This is also anecdotally verified on the roof - if you ever step in wet emulsion with any pitch to the roof and youll find out its slickern glass.

White elastomeric products may appear to have more dirt pick up than a aluminum product. However, it's a matter of reflective properties and a good maintenance program in place to keep a white elastomeric coating or a aluminum coating at it's peak performance will help.

When products are sprayable the amount of psi to spray the product is a function of viscosity, solids and liquid vehicle of any product. Usually asphalt emulsions are lower in solids which less psi's will needed to pump the product.

copperman Said: this one doesnt get to hot

:blink:

this one doesn't get to hot