Cementitious Waterproofing Coating

Why Cementitious Waterproofing Coatings

There is a multitude of cementitious waterproofing coatings and membranes on the market that are designated as suitable for below-grade or below ground use. Many manufacturers and distributors have certification process if you require the work you do to be guaranteed.
If you’re a DIY or just going to doing an odd waterproofing job, then you may not need to be certified.

Experience is a good teacher and the invent of Video Channels such as YouTube enable teachings that you could not have got 10 years ago. Important to watch any videos available. Carefully follow instructions on the bag/pail, lookup manufacturer, distributor, reseller website for the technical, application, and safety information. This educates you so you become proficient and be able to work quickly and safely.

There are many materials on the market, so any waterproofing to be done should be researched thoroughly before starting any job. Carefully review of the manufacturer’s literature, email or phone if in any doubt.  Site visits by a representative will not always be practical especially for some DIY jobs however an office visit may be appropriate.

cementitious waterproofing coating, Cementitious Basement Waterproofing swimming poolCementitious Waterproofing Coating 

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Cementitious products are some of the easiest waterproofing materials to use. They’re usually readily available from local suppliers of hardware suppliers, masonry products, and they’re easy to mix and apply. Come as cement-like powder. Usually, only water is added and then mixed until the correct consistency is achieved.

Usually, all you need to do the job is using this type of material, a long-handled stiff bristled brush will make your life easier.  Cementitious waterproofing coatings, the main advantage is that can and should be applied to a clean damp surface. So there is no need to have dry-wall.

According to concrete network.com.  “The chief disadvantage is that cementitious products have no give to them probably because cement just doesn’t stretch to any degree worth mentioning. They will stand up fine to a head of water, but will tolerate almost no joint or crack movement.”

My experience with cementitious waterproofing coatings shows that if a concrete wall cracks the membrane will crack. Most membranes have difficulty withstanding such events. Even those that have amazing elasticity can sheer or break at the point of the crack.

With Drizoro products cementitious waterproofing coating, drizoro maxseal waterproof decorative coating, because they are cementitious flexing of the structure itself will not cause any issues for the Drizoro Maxseal FlexDrizoro Maxseal Foundation, Drizoro Maxseal and others in this range.

Drizoro Maxseal, when applied to a full sheet of fibro cement, it will not crack or flake off when used as a wobble board. Should you be overly concerned with movement issues then use Drizoro Maxseal Flex which has greater flexibility.

For mobile cracks or expansion joints then Drizoro Maxjoint Elastic would be recommended.

The 3 best benefits for contractors or applicators using cementitious waterproofing coatings from Drizoro are

  1. applied from either side of a building structure to prevent water penetrating and degrading the building structure. (inside or outside the building structure)
  2. Drying of the concrete surface is not required and they MUST BE APPLIED TO DAMP SURFACE.
  3. Another benefit is that should a crack develop after completion of the application. Or any time during the life of the structural repairs are much cheaper since the leak is only where the crack occurs.  The leaks are then repaired, in most cases, from the inside on the internal wall.

Whereas identifying exactly the origin of leaks from other membranes is difficult.  Where the membrane has lost its integrity requires an exhaustive process.  These other membranes tend to slowly delaminate as the water penetrates behind the membrane, from the initial point. This destroys the adhesion allowing water to flow well beyond the point damage. So repairs can be much more costly than Drizoro cementitious coatings.

Liquid Membrane Coating

Liquid membranes are be applied by spray, roller, brush or trowel.  The wall being treated usually need to be completely dry. The Membrane coating cures into a coating which may feel rubbery, spongy or soft to touch on the wall. Manufacturer has a spray/brush -applied water-based liquid membrane composed of water-based emulsified asphalt. Polyurethane liquid membranes are also available but a caution for these is they are usually degraded by exposure to sunlight (Ultra Violet light) so if a little is left exposed then degradation will affect the viability of the total coating as water can enter above ground causing delamination of the membrane.

bitumin asphalt coating

There are special procedures for the treatment of wall-footing joints, voids, form-tie holes, and joints.

Liquid coatings may quick and easy to apply. Like cementitious coatings also be reasonably inexpensive.  Samples of these liquid coatings show an excellent elongation.
The major disadvantages are the inconsistency of the coverage. Any pinholes left in such coatings will most certainly come back to haunt you.

Sheet Membranes

There numerous sheet membrane materials, some are self-adhering, asphalt or even polyurethane membranes. Various thickness depending on specification.

Then there are the torch on style sheet membrane.
Usually more difficult to apply as surface preparation, priming, patching, joint treatment, terminations, lap joints, penetrations, and corners.

The major advantage of sheet membranes is the consistent thickness. Supplied at a specified thickness and have good elongation.

Disadvantages of sheet membranes are the costs of the material and labour. Also, the number of joints and seams can represent weak spots with a high potential for leaking.

Concrete Waterproofing Built-up Systems

These type of membranes usually have an embedded layer of polyester or fibreglass to strengthen the membrane. Embedding helps stop crack propagation which destroys a simple liquid applied coating even when applied in two coats.
However, especially with embedded fibreglass, The elongation ability of the membrane is severely reduced. I have seen some applications where the fibre actually pulls out due to it’s reduced elongation.

drizoro-maxseal-super-online-waterproofing-slabs-wall-dusting-mechnical-trowel-finishBentonite

Sodium bentonite, a clay material, has enjoyed some popularity but it comes in panel form. Although bentonite has become the choice of architects and builders. Bentonite Panels work because the bentonite absorbs a tremendous amount of water. The bentonite clay swells to 15 times its original volume filling cracks and voids. Some alternatives are available which have advantages over bentonite.

Naturally, some waterproofers are nervous about using bentonite panels for the same reason as “sheet membranes”. Finished waterproofing liquid coatings can be inspected. Seal integrity confirmed before backfilling.  With bentonite panels seal occurs after backfilling and once water is in contact.

So what could go wrong?

Luckily we are excited to have Drizoro Maxseal SUPERa Cementitious Waterproofing Coating which outperforms Bentonite so if you are using Bentonite please have a close look to see how Drizoro Maxseal SUPER compares. Drizoro Maxseal SUPER will give a more certain seal ie. a better result and be much easier and more cost-effective.