What green sealant do you recommend for the roof of our garage, which we use as a patio during summertime?


What green sealant do you recommend for the roof of our garage, which we use as a patio during summertime?

Asked by amal

The garage is made of cement. The cement is becoming stained (black color like) from the rain and because it's old. The garage was built in 1964. We see some cracks in the cement, so we need to prevent the water from seeping thru to the garage. What is the best way to do so, and to maintain the cement from getting damaged from the elements? Your assistance is greatly appreciated.

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Rick Goyette's picture

I have an image of your garage as a bunker-like structure with concrete walls on three sides and apoured ceiling / patio area. Repairing a bunker is a new experience for me; however, in terms of sealingthe concrete for your roof/patio this should be pretty straightforward.

Repairing the cracked concrete

Here is a great video that explains which product to use and how to seal each of the cracks which willsave me from typing out instructions!

This should address the cracks you have on your patio and prevent future erosion from theelements and water from leaking into the garage.

Sealing the concrete

The next step is to seal the concrete either with a clear or colored concrete coating but let's address thetopic of a "green sealant" first.

The greatest danger with a concrete sealant would be the impact on airquality in the form of volatile organic compounds. Since your project is outside you have many moreoptions in that regard.

  • Typically I would advise clients to use a low VOC sealant such as Scofield SelectSeal W which meets the USGBC's LEED for Homes Criteria for VOC usage in an area such as an attachedgarage slab.
  • Since your patio is outdoors the VOC limitations are not as stringent.
  • There are severaloptions available on Schofield's site here.

Be sure tocheck the data sheet on the product you use to seal the concrete to ensure it will work well with thematerial you used to fill the cracks!

Covering the patio

If you are not interested in a color option and don't like the look of your patio after you've sealed it witha clear sealant, you have the option of covering the patio with a wood floor look.

  • There is a productmanufactured by an FSC certified organization that can beautify your patio after you've filled thecracks and sealed the concrete.
  • Have a look at Decktiles.org for a magnificent finish to yourproject.

Good Luck!

For more information:

Read "I need to stain my concrete pool deck. Are there products and methods you can recommend, other than acid?" a Q&A answered by Cynthia Phakos.