Tag Archives: waterproofing

The Spring Issue of Waterproof! Magazine Is Out

May 5, 2022 Bill Leys

I recently got my spring issue of Waterproof! Magazine in the mail… This issue has a great article on using crystalline admixtures for waterproofing concrete. I have used Kryton myself in the past on several projects with great success.

There’s also a very interesting article on waterproofing being done on a yearly basis at Niagara Falls in Buffalo New York.

The other article that I found very interesting was by amir Hassan on protecting parking decks.

Be sure to click on waterproof magazine’s ad and go to their website and while you’re there subscribe I think it’s still only 20 bucks a year.

Champlain Towers

When Words Kill: Lessons From The Champlain Tower Collapse

June 29, 2021 Bill Leys

The author makes some very good points for consultants to consider… Using language that everyday people will understand. Especially when it comes to condominium boards of directors.

There are many things to consider when doing a visual inspection and certainly one of them is how bad is the degradation of concrete? Since a visual is only limited to what we can see and we don’t have x-ray vision there can certainly be damage inside of concrete that we are not aware of… Unconsolidated concrete rebar that isn’t properly tied sized etc. Hidden water damage may also exist.

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Ask the Deck Expert

A Reader Asks The Deck Expert About a Tiled Deck

August 9, 2017 Bill Leys

The Deck Expert answers readers questions for only $25.00 Recently one reader asked us this question about his tiled deck.

“I saw your site on the web.

I have a tiled exterior deck. I have discovered it was not hot mopped before laying tile.

Obviously, it leaks.

I have been advised to use sealants but they don’t waterproof.

Is there any product that will waterproof the tile without removing the tile, hot mopping and retiling?”

Jay Q Los Angeles

Our Answer

Dear Jay,

Sadly there isn’t any sealer that will waterproof the tile. Sealers will help reduce moisture absorbed into the tile and down through the mortar bed, but will never succeed at actually waterproofing it.

A proper waterproofing system for a tiled deck is installed prior to the tile and mud bed being set. A pre-sloped substrate is waterproofed with a membrane suitable for tiling over, then a drain board is set on the waterproofing to allow water that does get through tile/grout/expansion joints to evacuate to a drain or an edge.

Hot mop waterproofing is pretty much a method of a by-gone era and isn’t used much anymore. Your deck I’m afraid will need to be completely stripped down to the framing and rebuilt. If you want to put tile down again, you’ll need to hire the best craftsmen available, using the best industry standard methods for framing/substrate and the waterproofing and tile assemblies.

You should expect that this will run an average of $70 to $100 per square foot for a complete rebuild, a little less if you go with a walking deck system that looks like tile. The picture above is a decorative faux tile walking deck system from Pli-Dek.

Do your job right the first time, get the right information here at DeckExpert.com.

Ask the Deck Expert

A Reader Asks About Hot Mop For Waterproofing a Deck

February 28, 2017 Bill Leys

DeckExpert.com answers your questions about deck waterproofing methods and materials for only $25.00.

“I am building a new roof deck as part of a full house remodel and I found you when researching my waterproofing options. My builder is suggesting hot mop, but I am not sure it is an appropriate option for a deck. The deck is on the plywood substrate and will not be heavily used (it is primarily there due to city’s set back requirement), but I still want to make sure that it can withstand light use. We are planning to install modular deck tiles on top of the decking surface.” Marat B San Francisco CA

Hello Marat,

Thanks for writing; you’re wise to have done some research and raise doubts about “hot mop” for waterproofing a roof deck.

Today’s modern deck waterproofing systems from our manufacturer’s provide all in one solutions to your waterproofing dilemma. The decking/roofing systems under Division 7 Pedestrian Walking Decks are all tough durable membranes that can be finished to look like wood, tile, stone etc.

Alternatively, if you want a wood deck on pedestals above a waterproof surface, walking deck systems are still your best choice. The coatings can be installed and then pedestals can be placed on top of the waterproofing and a deck system built on top. With this method you should allow for being able to remove the decking to clean the waterproof surface periodically of debris. Extra slope over the minimum code required 1/4″ per foot may help flush debris off. I would suggest draining off roof edges rather than roof deck drains (ThunderbirdProducts.com) as debris may clog drains at the worst possible time. If you opt for drains, use a minimum of a 3″ drain and 3″ ABS pipe.

If you review our site, you’ll find lots of information and advice that should be useful in your quest. Make sure to read, understand and meet all requirements for a waterproof deck system and always use Best Practices to go over and above code which is just a bare minimum. For instance, use 1 1/8″ plywood over the minimum 5/8″.

Good luck with your project, Bill Leys The Deck Expert

Builder of Collapsed Berkeley Balcony Accused of Failing to Follow Plans by CSLB!

November 30, 2016 Bill Leys

The balcony that collapsed in June of 2015 in Berkeley, killing 6 and severely injuring 7 other Irish students has been found, after analysis by forensic scientists, to have been constructed improperly. As a result, the Contractors State License Board has filed through the Attorney General’s Office an accusation against Segue Construction, the general contractor.

The allegations are serious, not following plans without an architects approval will land you in hot water with CSLB. It has also resulted in 6 dead people and 7 injured. The weight of that alone would crush me, yet these people running Segue are conscienceless snakes that sought to blame the victims. How do they look in a mirror?

The accusation lists out specifically the contractors failures, from not using pressure treated materials, to using OSB board where their project manual said it was specifically not acceptable, to failing to cover and protect the deck until it could be waterproofed to failing to waterproof it properly.

Read the accusation by clicking here. Alternately you can read the specific allegations below. The accusation is a public document and the CSLB has posted it as a public service to help warn consumers, as they feel that Segue is a threat to the public. Segue is afforded due process and can defend against the accusation, including even if/when their license is suspended or revoked. Another case I’m familiar with has dragged on since October of 2013 and still proceeds today so justice may take a while here too.

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