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Waterproofing concrete tile roof with Elastomeric paint

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Waterproofing concrete tile roof with Elastomeric paint miamicuse 09-20-2006
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Posted by miamicuse on September 20, 2006, 10:50 pm
Location is Miami Florida. I am going to repaint my house. Single
story CBS (Concrete Block Stucco) with a concrete tile roof.

The concrete tile roof was partially damaged during hurricane
Wilma, the roofing company came out and repaired with some new tiles -
same size same model but different color, since that was all they had
in stock I was not in a position to be picky (roofing contractors are
hard to find and book in our areas). So anyways I have now a roof with
80% old tiles, a little faded gray color and 20% new bright white
tiles. I am considering repainting the roof.

After doing some research on the net, it seems there are a significant
amount
of people who thinks this is not a good idea because the paint will
eventually
break down and decompose after a short time under the extreme heat and rain
in Florida.

I did find this site which claims success.

http://www.somay.com/manufact/water/waterproofing_case_histories.html

a picture of the roof with their product after application:
http://www.somay.com/manufact/water/842barrel0002.jpg

The steps are:

Surface Preparation:
Treat Surface with Chlorine to Kill Mold, Mildew, Fungus
High Pressure Water Blast to Completely Clean Surface

Prime Coat:

SOMAY Product No. 777 - "PST" 100% Poly-Acrylic Primer, Sealer
Color: Clear

Intermediate Step:

SOMAY Product No. 992 - SOMAY Elastomeric "PATCH & SEAL" (Caulk) to seal
all joints

Intermediate and Finish Coats:

SOMAY Product No. 842, SOMAY Elastomeric "ROOF MASTIC", Sealer & Protector
Apply at 20 mils dry film thickness for each coat
Color: White

Total: 40 mils dry film thickness for all 3 coats

So what I don't understand is this. When they said "Intermediate Step ...
seal all joints" do they mean they seal the edge of each tile? So that
there is no water to go under any tile? and 40 mils of all 3 coasts is very
thick! This is like covering the roof completely with one continuous
layer...right?

Mc





Posted by chili palmer on September 20, 2006, 11:15 pm

miamicuse wrote:

> So what I don't understand is this. When they said "Intermediate Step ...
> seal all joints" do they mean they seal the edge of each tile? So that
> there is no water to go under any tile? and 40 mils of all 3 coasts is very
> thick! This is like covering the roof completely with one continuous
> layer...right?
>
> Mc

I think you're on the right track

far as one continuous layer..

i don't see the need

2 things

right! I agree.. 3mil is thick
second, why not just goback to your original plan of sealing the
concrete

you're not looking to waterproof the roof, just seal the concrete

sealers are super thin and soak into the block..
fuck all that prep shit.. i mean sure.. remove leaves and sticks and
stuff.

crete sealers have a watery property.. hell! spray it on!

why not just tint the sealer.. make several applications and be done
with it.

try to match the old color.


Posted by miamicuse on September 21, 2006, 4:00 am

>
> miamicuse wrote:
>
> > So what I don't understand is this. When they said "Intermediate Step
...
> > seal all joints" do they mean they seal the edge of each tile? So that
> > there is no water to go under any tile? and 40 mils of all 3 coasts is
very
> > thick! This is like covering the roof completely with one continuous
> > layer...right?
> >
> > Mc
>
> I think you're on the right track
>
> far as one continuous layer..
>
> i don't see the need
>
> 2 things
>
> right! I agree.. 3mil is thick
> second, why not just goback to your original plan of sealing the
> concrete
>
> you're not looking to waterproof the roof, just seal the concrete
>
> sealers are super thin and soak into the block..
> fuck all that prep shit.. i mean sure.. remove leaves and sticks and
> stuff.
>
> crete sealers have a watery property.. hell! spray it on!
>
> why not just tint the sealer.. make several applications and be done
> with it.
>
> try to match the old color.
>

you mean concrete sealer?

like:

58 Benjamin Moore Architectural Coatings Concrete Stain 072-01

or

58 Benjamin Moore Architectural Coatings Concrete Waterproofing Sealer
075-01

something like that?

Thanks,

MC



Posted by chili palmer on September 21, 2006, 8:05 am

miamicuse wrote:

> you mean concrete sealer?
>
> like:
>
> 58 Benjamin Moore Architectural Coatings Concrete Stain 072-01
>
> or
>
> 58 Benjamin Moore Architectural Coatings Concrete Waterproofing Sealer
> 075-01
>
> something like that?

sure! you get what you pay for, i've seen 5 and 6 yr sealers, i've seen
15 year sealers


Posted by John Keiser on September 21, 2006, 12:47 am
I'm in Hawaii [heavy UV] with a concrete shake-style tile roof.
If you are simply adding a color coat to even out the look, skip the heavy
prep.
1/3 the work and 1/3 the price.
I've had fine results from simply applying a quality elastomeric coating
with a heavy nap roller.
Don't apply after a rain - you'll tend to get bubbles. [Of course, no
better way to get a drizzle than to start a roof project.]
Colors will fade in a few years [darker colors faster] but the results
should be uniform.



--
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