Where should I waterproof?
  • Any area you plan to tile that is exposed to water splashes – such as a kitchen backsplash behind the sink or laundry backsplash
  • Any interior area where water vapor is generated
  • At least 100mm over the hob or step down onto the bathroom floor should be waterproofed
  • At least 150mm up the walls inside the shower walls needs to be waterproofed the vertical angle between any two walls in the shower needs to be waterproofed up to at least 1800mm high
  • The entire bathroom floor needs to be waterproofed if it’s timber flooring, plywood or particleboard, or if it is above the ground floor of the house
How do I bond The Shield to cement board?

Thin set mortar is suggested for most applications. Ensure that the substrate is clean, even, and load bearing. The thinset mortar must penetrate and engage the fleece.

Can tile be directly set over The Shield using unmodified thin set mortar?

Yes it can. We also suggest using thin set mortar to adhere The Shield to your substrate.

What substrates should The Shield be placed over?

The Shield can be applied over a number of substrates like plywood, gypsum board, or concrete backer. It can also be applied directly to drywall.

Is The Shield and Strong Strip flexible?

Both The Shield and Strong Strip are flexible. When bent, Strong Strip holds its shape so you can create a corner.

Can I use The Shield and Strong Strip in my basement?

Yes! Our products can be used anywhere in the home where you wish to tile, but are concerned about water penetrating the tile.

How do I seam two pieces of The Shield together?

Shameless plug – because or product is 2x wider than anything else out there, you don’t have to seam The Shield as often as you do with other waterproofing membranes. If you do have to seam, we highly recommend using Strong Strip. After using Thin Set Mortar to adhere two sheets of The Shield side by side, simply place Strong Strip over the seam and use Thin Set Mortar to adhere.

What kind of seaming cement should I use to seam two pieces of The Shield together?

We recommend Thinset Mortar.

Does it matter which side of The Shield goes up and which goes down?

The Shield and Strong Strip can face either way.

How should I install The Shield and Strong Strip?

For best results, download our Super Clear Instruction Sheet: The Shield Installation.

Can I paint over The Shield?

The Shield works it’s magic when it’s out of sight! It’s designed to be directly tiled over, so it can protect your substrate without you having to worry about a thing!

What tile adhesive should I use to get tile to stick over the Shield?

Tile should be adhered to The Shield with unmodified thinset mortar.

What tile adhesive should I use to get tile to stick over Strong Strip?

Tile should be adhered to Strong Strip with unmodified thinset mortar.

How do I make Strong Strip into a corner?

For best results, download our Super Clear Instruction Sheet: Corners

Can one person install The Shield by themselves?

Introvert? Misanthrope? Hermit? Have no fear – installing The Shield is a one-person job. The Shield is firmer than most other products, meaning it doesn’t flop around while you adhere it to the substrate.

Can The Shield and Strong Strip be used for outside tile projects?

No, both are for indoor applications only.

Can I apply The Shield and Strong Strip to masonry block walls?

No, masonry block is not a suitable substrate for The Shield and Strong Strip.

Can you sell me a larger roll of The Shield?

Yes! Email your requested roll length to hello@waterproofwarrior.com and we’ll get back to you in 24 hours. We sell rolls up to 200FT long.

How long do I have to wait before tiling over The Shield?

Unless directed otherwise by the instructions on your unmodified thinset mortar, The Shield will be set and ready to be tiled over after 24 hours.

Should I use modified or unmodified thinset when installing The Shield?

Unmodified thinset mortar tends to be best. It dries faster and in our opinion creates a stronger bond between The Shield and the substrate!

Can large format porcelain tile be used on top of The Shield?


Can The Shield and Strong Strip be installed horizontally?

Yes – both can be installed in any direction.

When installing the shield, what direction should I work in?

You should install The Shield beginning from the bottom and working your way up. For full instructions, check out the Super Clear Instruction Sheet most relevant to your project.

Can The Shield and Strong Strip be used before tiling in steam showers?

Yes – both are well-suited to protect substrates in your residential steam shower from Monster Mold and structural damage.

Modified and unmodified thinset mortar sound like the same thing. What’s the difference?

According to the Tile Council of North America (yes – that is a real council) there are several key differences:

Unmodified thinset also goes by the name of ‘dry-set mortar; it is pure Portland cement mixed with sand. Think of it as the ‘au natural’ version of thinset mortar. The additive-free, Non-GMO, organic smoothie your cross-fit loving coworker drinks.

If unmodified thinset is the organic smoothie, Modified thinset is the McDonalds Chocolate Milkshake. Although it does contain some Portland Cement and sand, there are a lot of latex/polymer additives mixed in there. These additives can be helpful in adhereing certain tiles, but we believe unmodified thinset works best when bonding Waterproof Warrior to you selection of substrate.

Though we are by no means cross-fit enthusiasts, we do recommend that you use Unmodified Thinset to adhere The Shield and Strong Strip to your appropriate substrate.

What size notched trowel should I use to install The Shield and Strong Strip?

We highly recommend a 1/4” x 3/16”  V-notched trowel.

How do I seal Strong Strip and The Shield to a bathub?

For best results, please download our Super Clear Instruction Sheet: Bathtub Installation.

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