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After you have accurately measured or calculated the total area or number of square feet of roof surface you plan to cover with the SOMAY "ROOF MASTIC"® waterproofing system, the following chart will help you to determine the minimum number of gallons required.
The Minimum Number of Gallons Required for Waterproofing
(On a Very Smooth, Non-Porous Surface)
Surface |
SOMAY |
SOMAY ROOF MASTIC, Prod. No. 842 |
Area To |
PRIMER |
First Coat |
|
Second Coat |
|
Both Coats |
Be |
Prod. No. 777 |
ROOF MASTIC |
|
ROOF MASTIC |
|
ROOF MASTIC |
Coated |
|
(@ 20 mils) |
|
(@ 20 mils) |
|
(@ 40 mils) |
Sq. Ft. |
Gallons |
Gallons |
+ |
Gallons |
= |
Gallons |
| |
100 |
0.5 |
2 |
+ |
2 |
= |
4 |
200 |
1 |
4 |
+ |
4 |
= |
8 |
300 |
1.5 |
6 |
+ |
6 |
= |
12 |
400 |
2 |
8 |
+ |
8 |
= |
16 |
500 |
2.5 |
10 |
+ |
10 |
= |
20 |
| |
750 |
3.75 |
15 |
+ |
15 |
= |
30 |
1000 |
5 |
20 |
+ |
20 |
= |
40 |
1250 |
6.25 |
25 |
+ |
25 |
= |
50 |
1500 |
7.5 |
30 |
+ |
30 |
= |
60 |
| |
1750 |
8.75 |
35 |
+ |
35 |
= |
70 |
2000 |
10 |
40 |
+ |
40 |
= |
80 |
2500 |
12.5 |
50 |
+ |
50 |
= |
100 |
3000 |
15 |
60 |
+ |
60 |
= |
120 |
| |
3500 |
17.5 |
70 |
+ |
70 |
= |
140 |
4000 |
20 |
80 |
+ |
80 |
= |
160 |
4500 |
22.5 |
90 |
+ |
90 |
= |
180 |
5000 |
25 |
100 |
+ |
100 |
= |
200 |
NOTE: The ratio of "PST" Primer, No. 777-00, to "ROOF MASTIC"®, No. 842, is 1:8.
NOTE: The surface area to be coated must be measured very carefully to insure the proper amount of material is applied to develop the required coating thickness. The above quantities are the minimum amounts that MUST be applied to very smooth, non-porous surfaces. Rough, porous surfaces will require considerably more material than the quantities shown above to develop the required film (membrane) thickness.
WASTAGE FACTOR (not shown on chart)
Never does 100% of the coating in a container end up on the surface being coated. There is always a certain amount of wastage, such as the coating material one cannot easily get out of the container, or the coating material that is left in the applicator, either brush, roller, or sprayer. Professional painters, based on years of experience, know that they must add an extra percentage for wastage, normally an extra 10% for brush or roller application, and an extra 25% for spray application. Be sure you calculate this factor when determining how much SOMAY Primer and SOMAY "ROOF MASTIC" you will need.
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