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Gardner Flexx-Gard Rubberized Premium Fibered Asphalt Roof & Foundation Coating, 5 gal.

SKU # 340084399
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Product Rating is 4.7

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Item Information

Gardner Flexx-Gard is a rubberized premium fibered asphalt coating for waterproofing roofs & foundations.

  • Unique blend of rubber and reinforcing fibers provides strength and flexibility for a durable lasting waterproof seal, as well as superior crack resistance
  • Exceptional adhesion to existing roofing, masonry, woo, and metal surfaces
  • For roofs - seals worn out areas and leaves a tough, flexible black waterproof seal
  • Great base coat for use prior to applying reflective roof coatings
  • For foundations - weatherproofs, seals and preserves below grade surfaces including masonry, wood and metal
  • Multi-use product that forms a tough rubberized seal on a variety of surfaces

Specification Description
Brand: Gardner
Noun: Asphalt Roof & Foundation Coating
Warranty: 1 Year
Product Type: Roof Repair
Manufacturer Part Number 0175-GA
Gardner Flexx-Gard Rubberized Premium Fibered Asphalt Roof & Foundation Coating, 5 gal. is rated 4.7 out of 5 by 3.
Rated 4 out of 5 by from good sealer I bought this product several weeks ago. The following may help you. It is very hard to mix. I had to put it in front of the fireplace to heat. I used a crow bar to break it up. Had to do this for several hrs before I could use the paint mix paddle that attaches to my drill. It cools of very fast when applying. I used a brush to spread and you can't go over it much once applied. I had time to use only this before the rain and it seems to have seal the board I used for the shed.
Date published: 2018-11-27
Rated 5 out of 5 by from Works well I purchased a 4.75 gallon bucket of Flexx-Gard to use on a small flat roof over our sun porch. Even though it is late in the year (November) it cured within hours and sealed a troublesome leak. It was applied at 50 degrees with rain forecast in the next 36 hours, and even with only one coat it worked. For fibered roof coating it is very easy to apply but allow yourself a half hour or longer to stir. Great I'm hoping for one more clear 50 degree day so I can apply the second coat. Highly recommend.
Date published: 2013-11-18
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Is this product good for asphalt shingle

Asked by: Ted9
This is not recommended to be applied over asphalt shingles.
Answered by: GardnerGibson
Date published: 2017-10-12

Now many gallons do i need to cover 500 sf

Asked by: mike111111
You will probably need 2 of the 5 gallon containers. You may have some extra, but you should apply a second coat.
Answered by: GardnerGibson
Date published: 2018-09-25

I'm looking to put this on my fence posts before I set them. That way its weatherproof. #1- Is this a good idea? #2- should I use treated or no treated lumber? The entire post will be coated.

Asked by: BigBeamer77
Thanks for your interest in Gardner Flexx-Gard. Flexx-Gard is formulated for use on wood to preserve and damp-proof below grade. New treated wood will repel coatings. For more information about Flexx-Gard, including preparation and application, check out the Technical Data Sheet (TDS) on the product page of our website.
Answered by: GardnerGibson
Date published: 2018-09-25

2 questions: Can I use this to seal the exposed wood on my new chicken coop? Can I paint over it? Like with exterior latex paint?

Asked by: PalmerChris
Yes it will coat over the wood and seal it. You can paint over it, however you may see some discoloration of the paint with light colors.
Answered by: GardnerGibson
Date published: 2017-10-12

Will this product work on bisqueen plastic for a temporary fix ?

Asked by: Refresh
Thanks for your question. It's not formulated for such application.
Answered by: GardnerGibson
Date published: 2017-04-20

Can I use this over an ondura roof that needs replaced

Asked by: Gregnonroofer
Thanks for your question. Flexx-Gard can be used over a sound ondura roof. Please see directions on the label or on the Technical Data Sheet located on the product page of our website at
Answered by: GardnerGibson
Date published: 2018-09-25

We have a completely underground basement with cinder block walls that leak from groundwater every time we get a good rain.  Will this product work to stop the walls from leaking?  If not, what do you recommend (product-wise or otherwise)??  Thank you! 

Asked by: Brandon51
If you have active water coming in your basement, you need to do some major work. You will need to dig the foundation around the house and power clean it. Then apply a primer/seal and a waterproofing membrane. Some people also install a French drain as well. I think you should get some other ideas fro a local waterproofing contractor.
Answered by: GardnerGibson
Date published: 2018-11-12

Can this product be used by itself to deal a mobile home or just as a primer.

Asked by: Wolverineme
Thanks for your question. You didn't reference the type of roof on your home. You can apply Gardner Flexx-Gard to metal or asphalt roofing. This product shouldn't be used on EPDM, Hypalon, TPO or PVC surfaces (singly ply or synthetic roofs).
Answered by: GardnerGibson
Date published: 2017-07-15
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