Easy to follow DIY steps for how to waterproof a plywood deck, roof, or balcony with a Liquid Rubber Deck Coating. How to waterproof wood outside. How to waterproof a deck.

How to Waterproof A Plywood Deck, Roof or Balcony

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Easy to follow DIY steps for how to waterproof a plywood deck, roof, or balcony with a Liquid Rubber Deck Coating.

This Spring, I was busy, busy building a big playhouse for my kids. I designed it to look like a mini version of our barn. But, the playhouse has a recessed upper deck on one half of the roof. This post is all about how to waterproof a plywood deck, roof or balcony with Liquid Rubber Deck Coating. Spoiler Alert, I love this stuff!

When my Dad and I framed out that deck, we sloped it a little for drainage. That was easy enough to do since one side of the deck is open. But, some people need to waterproof a roof top deck or other surface without an open side for drainage. In that case, you will need to install some sort of drain to get the standing water off of the deck.

UNLESS, you’re actually trying to trap water. I know some people use this stuff to waterproof the inside of wooden planters. That’s a clever way to keep water in your soil while extending the life of that wood.

Easy to follow DIY steps for how to waterproof a plywood deck, roof, or balcony with a Liquid Rubber Deck Coating. How to waterproof wood outside. How to waterproof a deck.
Don’t forget to save this DIY on Pinterest.

Anyway, let’s get to those steps for how to waterproof a plywood deck, roof or balcony with Liquid Rubber Deck Coating. 🙂

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See How I Applied the Deck Coating in this Video

Watch this video to see exactly how to waterproof a plywood deck, roof or balcony with a Liquid Rubber Deck Coating. You can see each step as I do it!

Here’s What I Used to Waterproof my Plywood

How do you make a plywood deck or roof waterproof?

There’s always more than 1 way to do anything. After 2 days or research, I decided to use Liquid Rubber Deck Coating to waterproof my plywood deck or roof. I picked Liquid Rubber because of how easy it is to use, it comes in lots of nice colors, and the great reviews it has on Amazon.

Watch the video or read the steps below to see How to Waterproof A Plywood Deck. It’s so easy. I’m so glad I used this on the upper deck of my Kids Playhouse from a Shed.

Here’s the deck before I applied the Liquid Rubber Deck Coating. The deck slopes slightly down to the open edge to help the water run off the deck. I also have an L-shaped piece of flashing over the plywood and behind the siding to stop any water from being trapped back there. If you are building a playhouse or shed, I have the steps for DIY ridge cap shingles from architectural shingles and DIY gable vent installation too.

How much Liquid Rubber Deck Coating do you need?

So, how much Liquid Rubber Deck Coating do you need? It depends on how big your plywood deck, roof, or balcony is, really. I used 5 gallons of the Liquid Rubber on my 75 square foot deck. I applied 5 thick coats at about 1 gallon per coat.

Liquid Rubber recommends 3 to 4 coats for waterproofing areas. They say you can cover about 100 square feet per gallon. That’s probably right, my coats were probably thicker than they needed to be. And I applied extra coats on the edges just to be extra safe.

I ended up applying more than the recommended 4 coats because I wanted to use up the full 5 gallon bucket and extra waterproofing never hurts, right. 🙂

And, I used maybe a quarter of a gallon of the Liquid Rubber Primer on my 75 square foot deck. I would recommend measuring the length of all of the edges and seams between pieces of plywood to get an exact measurement for how much geo-textile you need.

Apply the geotextile to all edges and where two sheets of plywood meet.
The Liquid Rubber Deck Coating is applied under and over the geo-textile.

Steps to Apply Liquid Rubber Deck Coating

Be sure to always read the directions on the containers to be sure you know how to waterproof a plywood deck. They could always change a formulation or the instructions after I write these steps. Or, you’re plywood deck, roof or balcony might have special circumstances I don’t cover in this tutorial.

AND, you can pick a smooth or textured version of Liquid Rubber, depending on what you want to use it for. A textured surface might be best if you’ll be walking on it with wet feet. Like near a pool.

  1. Start by patching any gaps in the plywood with Minwax Wood Filler or similar. Let dry and sand smooth.
  2. Then sand the plywood and any sheet metal that will also have the Liquid Rubber Deck Coating applied to it. I used 40 grit sanding discs.
  3. Clean off the dust, then apply the primer to the entire surface with a large paint brush.
  4. Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. Use the Liquid Rubber Deck Coating under the textile to stick it to all seams. Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. You can see how I do that in the video above.
  5. Let that dry before applying the full first coat of Liquid Rubber on the surface. Use a paint brush along all edges and a roller to apply the Deck Coating to the surface and partially up the wall to waterproof those areas.
  6. Let each coat dry completely in between.
Here’s the deck after all of the geo-textile was applied.
Applying the poured rubber, Liquid Rubber Deck Coating to the plywood deck.
I used a rolled to quickly apply the Liquid Rubber to the middle. I used a brush on the edges. You might notice that I applied the Liquid Rubber 1″ up the walls. Don’t worry, you can paint over that part with an exterior grade paint and primer in one (like Behr’s).

That’s it! Easy, right? I love how this deck coating looks and it feels soft on bare feet. It feels like walking on linoleum. It’s been 6 months since I applied this coating on the deck of the playhouse and it’s still looking great and keeping the water out of the playhouse. Nice!

What Happens if it Rains on Wet Liquid Rubber Deck Coating???

Try to pick a few dry days in a row to waterproof your plywood deck, if possible. I tried doing that, but when you live in a humid part of the south, unexpected showers pop up all the time.

My first coat of the Liquid Rubber Deck Coating was only about 70% dry when it was rained on. Luckily, it didn’t ruin my deck. You can see what happened in the video above. But, all of the Liquid Rubber that was dry before the rain stayed dry. The spots that were wet mixed with rain water.

I used paper towels to gently wipe up that wet mixture of Liquid Rubber Deck Coating and Rain. Once I removed all of that wet deck coating, I let the surface dry, then applied another full coat of the Deck Coating. Everything dried fine. I applied 5 coats in total with a couple extra coats in the edges and around the posts, to be extra safe.

Easy to follow DIY steps for how to waterproof a plywood deck, roof, or balcony with a Liquid Rubber Deck Coating. How to waterproof wood outside. How to waterproof a deck.
Here’s the finished deck after following these steps for How to Waterproof a Plywood Deck, Roof, or Balcony with Liquid Rubber.

That’s it for how to waterproof a plywood deck, roof or balcony with Liquid Rubber Deck Coating. Looking for more of my Easy DIY Home Improvement videos? You can see them here, on my YouTube channel. 🙂


If you’re tired of having a dry looking, sun damaged front door, check out this quick 1 step fix for a dry wood front door.

My poor front door takes a serious beating from the hot Texas sun. This 1-step fix moisturizes my Dry Wood Front Door, gets rid of heat haze, brings back the shine, and protects the door from sun-damage.

Or, this easy DIY for how to clean car seats at home.

Written steps and a how to video showing how to Clean Car Seats at Home, the Easy Way with a portable Bissell SpotClean Pro. This even worked on my gross chocolate milk covered seats!Did you know you can replace the sanding pad on orbital sanders? It’s a quick and easy fix for a worn out pad that sanding discs won’t stick to anymore.

Quick and Easy to follow guide for Dewalt Sanding Pad Repair. With Written Steps and Video for Velcro Pad Replacement for an Orbital Sander. How to replace the velcro sanding pad on an orbital sander.

Here’s how I built that fun DIY Kids Climbing Ramp or Wall for our playhouse.

Easy to follow steps and video to make a kids climbing ramp, or rock climbing wall, for that backyard playhouse, fort, or play set. Fun design, right?! DIY Kids Rock Climbing Wall or Ramp.


How to Waterproof a Plywood Deck

Easy to follow DIY steps for how to waterproof a plywood deck, roof, or balcony with a Liquid Rubber Deck Coating. How to waterproof wood outside. How to waterproof a deck.

Easy to follow DIY steps and video showing how to waterproof a plywood deck, roof, or balcony with Liquid Rubber Deck Coating.

Materials

  • Liquid Rubber Deck Coating
  • Liquid Rubber Primer
  • Liquid Rubber Geo-Textile

Instructions

Steps to Apply Liquid Rubber Deck Coating

  1. Start by patching any gaps in the plywood with Minwax Wood Filler or similar. Let dry and sand smooth.
  2. Then sand the plywood and any sheet metal that will also have the Liquid Rubber Deck Coating applied to it. I used 40 grit sanding discs.
  3. Clean off the dust, then apply the primer to the entire surface with a large paint brush.
  4. Once the primer dries, apply the geo-textile on all edges and seams on the plywood deck, roof or balcony. Use the Liquid Rubber Deck Coating under the textile to stick it to all seams. Once the coating under the geo-textile mostly dries, you can apply a coat over the geo-textile. You can see how I do that in the video above.
  5. Let that dry before applying the full first coat of Liquid Rubber on the surface. Use a paint brush along all edges and a roller to apply the Deck Coating to the surface and partially up the wall to waterproof those areas.
  6. Let each coat dry completely in between.

Notes

Be sure to always read the directions on the containers to be sure you know how to waterproof a plywood deck. They could always change a formulation or the instructions after I write these steps. Or, you're plywood deck, roof or balcony might have special circumstances I don't cover in this tutorial.

AND, you can pick a smooth or textured version of Liquid Rubber, depending on what you want to use it for. A textured surface might be best if you'll be walking on it with wet feet. Like near a pool.

I love how this deck coating looks and it feels soft on bare feet. It feels like walking on linoleum. It's been 6 months since I applied this coating on the deck of the playhouse and it's still looking great and keeping the water out of the playhouse. Nice!

Feeling inspired? Now that you know How to Waterproof A Plywood Deck with Liquid Rubber Deck Coating, you can do it too. Let me know if you have questions. Don’t forget to sign up for the Abbotts At Home email newsletter to get DIY, Remodeling, and Crafty ideas in your inbox.

2 thoughts on “How to Waterproof A Plywood Deck, Roof or Balcony”

  1. This is a great tutorial. Very useful for me as we refurbish our deck.
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    Thank you for sharing at #OverTheMoon. Pinned and shared. Have a lovely week. I hope to see you at next week’s party too! Please stay safe and healthy. Come party with us at Over The Moon! Catapult your content Over The Moon! @marilyn_lesniak @EclecticRedBarn
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